Terms and Conditions

Q: ‎

Whipple Industries, Inc., Terms and Conditions

Limited Warranty / Limitation of Remedies

Read the Sections Carefully.

The Goods Sold Under This Contract Have Only a Limited Warranty. There Are No Warranties Which Extend Beyond the Description on the Face of This Document.

Whipple Industries, Inc., Limited Warranty. Whipple Industries, Inc., warrants that, for a period of one year from the date of purchase, as evidenced by the "Invoice Date'' on the Purchase Contract, goods manufactured by Whipple Industries, Inc. (with the exceptions noted below***) shall be free of defects in workmanship and materials. If a Whipple Industries, Inc. product is suspected of being defective, it may be returned only in accordance with the Returns and Exchanges procedures outlined in these materials.

Terms and Conditions. Upon examination of a returned product, Whipple Industries, Inc., in its sole discretion, shall determine whether the product is covered by this limited warranty and, if so, whether it is to be repaired or replaced. (For example, since superchargers create unique sounds, noises deemed by Whipple Industries, Inc. to be "normal" for superchargers are not covered by this Limited Warranty.) If Whipple Industries, Inc. determines the product is covered by this Limited Warranty, Whipple Industries, Inc. shall repair or replace it only to the extent that that can be done with parts manufactured by Whipple Industries, Inc. Whipple Industries, Inc. will return repaired or replaced items to buyer by ground service. Whipple Industries, Inc. does not know the particular purpose for which the goods will be used, and buyer is not relying on Whipple Industries, Inc.'s, skill or judgment to select or furnish suitable goods. There is no warranty that the goods sold under the Purchase contract shall be fit for a particular purpose. There is no warranty of merchantability of the goods sold under the Purchase contract and no warranty that may be said to arise from a course of dealing or usage of trade.

***Excepted Goods. Whipple Industries, Inc. does not warrant: (1) goods designed for off-road use; (2) goods considered racing parts; (3) goods which have been modified or altered in any way, including supercharger pulleys, engine RPM limit, RPM shift points, air intakes, porting; (4) goods which Whipple Industries, Inc., in its sole discretion, determines to have been subjected to misuse, neglect, accident, improper installation or adjustment, dirt, or other contaminants, water corrosion, other adverse conditions, or faulty repair; (5) goods used in a way other than as recommended by Whipple Industries, Inc.; (6) goods not manufactured by Whipple Industries, Inc., (7) electrical parts; (8) special orders; (9) engine performance parts; (10) installed or used items; (11) custom ordered or custom built items.

Limitation of Remedies. The preceding Limited Warranty section describes the exclusive remedy available to buyer for alleged breach or negligence by Whipple Industries, Inc. Buyer shall not in any event be entitled to reimbursement or compensation for loss of use, inconvenience, installation or removal costs, damage to vehicles, emotional distress, lost profits, shipping, labor costs, or any other claimed consequential or incidental damages, or other losses or damages of any kind whatsoever, whether caused by Whipple Industries, Inc.'s, own negligence or otherwise.

Indemnity. Buyer shall indemnify Whipple Industries, Inc., against, and hold Whipple Industries, Inc., harmless from: any and all claims, actions, suits, costs, and attorney's fees, arising out of, connected with, or resulting from a Whipple Industries, Inc.'s product while in buyer's possession or subject to buyer's control including, without limitation, claims arising out of manufacture, selection, delivery, possession, use, operation, malfunction, or return of any Whipple Industries, Inc.'s product, including claims alleged to arise out of or result from Whipple Industries, Inc.'s own negligence.

Returns and Exchanges. Authorization to return unwanted merchandise must be obtained within 30 days of shipping date. Returns and exchanges will be accepted only with a return authorization number (RMA) obtained from Whipple Industries, Inc., at the telephone number below. Return Authorization Numbers are only valid for 30 days from date of issue. The Return Authorization Number must be written on the outside of the return package and on a tag with your name on it attached to the goods inside. A Return Authorization Number does NOT guarantee replacement or refund. All allowable returns are subject to a 20% handling, re-boxing, and re-stocking charge except where caused by Whipple Industries, Inc.'s error. Items must be returned in new, resalable condition and in original packing. Returns MUST be sent freight pre-paid by you. We will not accept C.O.D. shipments. A photocopy of your invoice clearly showing the Invoice number must accompany your return, along with a written explanation of your claim and your phone number.

Canceled Orders. Credit card orders canceled 24 hours after Whipple processing are subject to a 5% restocking/processing fee.

Shipping. Whipple Industries, Inc. generally ships goods via FedEx Ground unless you specify, and bear the expense of, other shipping. Please allow at least 2-4 working days for shipments of in-stock goods to Western states and 7-10 working days for shipments elsewhere. If a shipment is returned to us as undeliverable (e.g., "not in" on three delivery attempts, delivery refused, or failure to pay), you will be responsible for delivery charges, and no future shipments will be made until those shipping charges have been paid.

Shipping Errors. If you receive an incorrect item due to Whipple Industries, Inc.'s error, we will issue a FedEx "call tag" and pick up the part at no cost to you and simultaneously ship the correct part and bill your charge card for it. Then, upon our receipt of the returned part, we will credit your account for its cost. (If you request, we will await receipt of the incorrect part from you before shipping the correct part and in that case will only bill your credit card once.) Items reshipped because of our error will be shipped via FedEx Ground at our expense. If you require FedEx Express freight, you must pay the difference between ground and air freight costs.

Claims for Damaged Shipments. All goods leave our facility properly packaged and in perfect condition. Upon receipt of your shipment, please inspect cartons immediately and identify damage in the presence of the delivery person. Damage claims must be made with the freight carrier. Whipple Industries, Inc. is not responsible for damage incurred during transit.

Phone Orders and Payment. The quickest method of ordering is by telephone with payment by VISA, MASTERCARD, or AMERICAN EXPRESS. (Not available to post office boxes) You may also send money orders or cashier's checks for faster shipping. Personal checks normally require 15 days to clear, but we will ship immediately upon receiving a photocopy of your canceled check. Checks returned by your bank for any reason are subject to a $35.00 charge. C.O.D. orders are only accepted on in-stock Items (not special orders).

Materials & Specifications. All merchandise information in our catalog is true and correct as of the time of publication. However, we constantly update our products and merchandise to offer the finest parts and accessories available. Thus, prices, materials, design, and specifications are subject to change without notice.

Resolution of Disputes/ Arbitration/Waiver of Jury. Any and all complaints, disputes, or claims must be in writing delivered to Whipple Industries, Inc., at the address below. If your claim or dispute in not resolved within 30 days of its delivery to Whipple Industries. Inc., it shall be settled by arbitration in accordance with the rules and procedures of the American Arbitration Association through its Fresno, California office (6795 N. Palm Avenue, Fresno, California 93711: telephone: (559) 448-0389). The award rendered by the arbitrator will be final and may be entered as a judgment in the Fresno County Courts, Fresno, California. You understand and agree that you are agreeing to arbitration instead of trial by judge or jury, that you are giving up the right to a trial by judge or jury of any claim or dispute with Whipple Industries, Inc.

Severability. If any of these Terms and Conditions are determined to be unenforceable, the remainder shall remain in full force and affect.

Waiver/Modification. None of these Terms and Conditions may be waived, altered, or otherwise modified except in writing signed by Whipple Industries, Inc.

The Applicable Law/Jurisdiction & Venue. The Purchase Contract shall be deemed to have been entered into in, and is to be governed by the laws of, the State of California. Any court action to enforce the arbitration provisions of this contract or otherwise must be filed and tried in the Fresno County Courts, Fresno, California. It is agreed that no other court shall have jurisdiction or venue.
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FAQ

Q: ‎

Supercharging of internal combustion engines has been used for many years as a method to improve engine performance and efficiency. Entering the millennium, a new trend is appearing. The trend points to small displacement engines in order to meet federal emission legislation on fuel consumption and emission control. The driver, however, still demands the same performance they're used to.
A good way to meet these needs is supercharging otherwise known as forced induction. The purpose of supercharging an engine is to raise the density of the air charge, before it's delivered to the cylinders. Thus, the increased mass of air trapped and then compressed in each cylinder during each induction and compression stroke makes more oxygen available for combustion than the conventional method of drawing the fresh air charge into the cylinder (naturally aspirated). Consequently, more air and fuel per cycle will be forced into the cylinder, and this can be efficiently burnt during the combustion process to raise the engine power output to higher than would otherwise be possible.
Generally, there are three basic types of "superchargers," the most popular being the exhaust-gas driven turbocharger, mechanically driven superchargers and the pressure-wave supercharger. The mechanically driven supercharger is broken up into two groups as well, the mechanically driven centrifugal supercharger and the mechanically-driven positive displacement supercharger such as the screw-type and roots-type.
In automotive and marine applications, the pressure-wave supercharger is rarely used. The turbo and roots-type superchargers have been the most popular forced induction methods in the past. While the turbo creates great peak horsepower, turbo lag and high cold start emissions due to the thermal mass are severe drawbacks of the turbocharger. Small displacement engines need higher-pressure ratios to achieve the performance demanded by the driver. This fact increases the mentioned drawbacks of the turbo and makes the turbocharger a less desirable alternative for supercharging than the mechanical twin-screw supercharger. The Whipple twin-screw charger does not have the usual drawbacks of earlier mechanical superchargers such as the roots-type, such as poor efficiency especially at high-pressure ratios, high rpm, high noise level as well as high price. Comparative tests, made independently by Whipple Industries, show that the twin-screw compressor is the most effective supercharging method available.

Q: What is a screw compressor and how does it work? 

A screw compressor is a positive displacement machine that uses a pair of intermeshing rotors to produce compression. The rotors comprise of helical lobes affixed to a front and rear shaft. One rotor is called the male rotor and it will typically have three bulbous lobes. The other rotor is the female rotor and this has valleys machined into it that match the curvature of the male lobes. Typically the female rotor will have five valleys. The rotors never touch, but are timed by a pair of gears operating in a lubricated chamber, which is separated from the rotor chamber.  With the 3-5 rotor combination, the male rotor turns 1.66 times to every one time of the female rotor. 
The number of lobes on the male and female rotor will vary from one compressor manufacturer to another. However, the female rotor will always have numerically more valleys that the male rotor has lobes. Because of the number of male lobes, there are three compression cycles per revolution, which means that the resulting compressed air has small pulsations compared to a reciprocating compressor. By the time that the compressed air leaves the package, it is to all intents and purposes pulsation free. 

Q: Where did the screw compressor come from?  

Heinrich Krigar in Germany on March 24th, 1878, patent #4121, first patented the principle of the screw compressor. He modified and improved his designs later that year and lodged a second patent (number 7116) on August 16th, 1878. Both of these patents are amongst the earliest on record, as the German Patent Office had only been formed just one year earlier. 
Heinrich Krigar resided in Hannover and his illustrations clearly show a two-lobe rotor assembly, each rotor having the same profile as each other. In fact the rotor configuration resembles the Roots design, exhibited in Europe during 1867, with the exception that the rotors in the Krigar screw compressor twist through an angle of 180 deg along their length. 
At that time it was not possible to develop the idea any further because of the lack of manufacturing technology. 
Half a century later, a Swedish steam turbine manufacturer called Ljungstroms Angturbin AB appointed a new Chief Engineer, his name was Alf Lysholm and he was to be the pivotal in the development of the modern screw compressor. At that time, Lysholm was looking into lightweight compressors for gas and steam turbine use.  
By this time the original patent rights had expired. Lysholm developed the profile of the screw compressor and tested various configurations and rotor lobe combinations. Not only was the shape of the rotors important, he solved the problem and patented the method for accurately machining the rotors. The 1935 patent clearly shows his asymmetric 5 female - 4 male lobe rotor design, although the shapes have been 'fine tuned' over the years, the screw compressor had at last been born. 
Ljungstroms Angturbin AB changed its name to Svenska Rotor Maskiner AB in 1951. This company is well known throughout the world as SRM, and has issued manufacturing licensees to almost every screw compressor manufacturer that exists today. 

Q: When did the screw compressor reach the automotive market? 

Sprintex (1980)

In the early 80’s, Sprintex used some out of patent Lysholm rotor designs to create one of the first twin-screw superchargers. The results were very promising, both parasitic losses and discharge temperatures were far superior to other positive displacement superchargers. Some of its first units were produced in the early 1980’s but manufacturing was still very expensive which hampered its marketability.  
In 1988, Art Whipple of Whipple Superchargers felt the little known “screw-type” supercharger had superior efficiency and was certainly the supercharger for the future. Whipple became the first North American Company to utilize the screw compressor for a production supercharger kit, but again, manufacturing cost hampered its true marketability. Whipple also found that compressor size was a problem. The original units were designed for smaller engines of Europe, the US market needed larger compressors with more airflow capacity. 

Opcon Autorotor (1990)

In 1990, SRM formed a sister company named Opcon Autorotor. This company was formed specifically to develop twin-screw compressors for use on internal combustion engine applications. With the vast knowledge and history of SRM, Autorotor used a later generation D-profile rotor design.  By 1991, Autorotor signed an exclusive agreement with Art Whipple of Whipple Industries, which had already been producing supercharger systems using the Sprintex supercharger. This relationship was a tremendous success and quickly helped put the screw compressor in the automotive market. By 1992, the Autorotor compressor had adopted the name “Whipple Charger” which is still used today.  
In the early 90’s Whipple Superchargers was over-burdened with building “systems” that they decided to only concentrate on General Motor vehicles. Whipple then agreed to supply Kenne Bell the “Whipple Charger” compressors for use on Ford applications. In 1995, Opcon Autorotor went through some difficult times and split from SRM. 
Lysholm Technologies (1995)
When Autorotor decided to part ways from SRM, the general partners of SRM formed a 
new supercharger company named Lysholm Technologies after the original chief engineer of SRM, Mr. Alf Lysholm. This company was formed to create a true OEM quality twin-screw compressor for internal combustion engines. In 1999, Lysholm Technologies formed a partnership with Eaton Corporation for the OEM rights. This allowed Lysholm Technologies to adapt some of the same mechanical principles that was so successful and proven with the Eaton roots-type superchargers.   
At this time, the screw compressor was being prepared for mass production for future OEM quantity levels. This joint venture increased the reliability and durability as well as validating the screw compressor technology but took years for it to reach the OEM level. It wasn’t until 2004 that Lysholm begin delivering their first true OEM application via Eaton Corporation for the famed Ford GT super car.   

Opcon Group (2004)

In 2004, Lysholm Technologies and the Opcon Group merged, in hope of combining forces and taking the screw compressor to the next level of high volume production.  Although this seemed good on paper, this created issues with delivery to the aftermarket distributors.  The last quarter of 2004 and first two quarters of 2005 showed very little production of twin-screw compressors through Lysholm Technologies.  This put a tremendous strain on the world’s largest aftermarket twin-screw compressor distributor, Whipple Industries. 
Whipple Superchargers (2005 and up)
Due to the lack of delivery and sever back order level, Whipple Superchargers began  development of their own line of superchargers.  With their extensive knowledge and years of experience, Whipple developed an entirely new supercharger lineup that featured all of the latest technology in rotor profile, housing, rotor coating and bearing design. The results were astounding, not only did production begin  in the USA, Whipple also increased compressor efficiency, lowered overall noise level, increased reliability, engineered the ability to update and repair (some are non-repairable) and increased it’s durability for a wider variety of applications.
If more power is what you crave…Whipple Superchargers has the solution…heart-stopping acceleration, complete bolt-on packages, emissions legal supercharger kits that boost power up to 60%. By utilizing the Whipple Twin Screw Supercharger, we provide the largest effective power gains, while maintaining safe, trouble-free operation. The Whipple Charger gives you the unique combination of maximum power at low rpm’s for incredible drive-ability while still providing ultra high efficiency for top-end horsepower. Just squeeze the throttle and the engine responds immediately, from idle to redline. the thrill ride never stops! 
The results are breathtaking…0-60 times drop dramatically, up to 60% power increases throughout the operating range, incredible throttle response, emission compliance and virtually maintenance-free. How is this possible? It’s the integration of the Whipple Twin Screw Supercharger and Whipple's superior engineering that makes it all possible.
Over the past fifteen years, Whipple Superchargers has risen above the competition to become the true supercharging leaders with proven performance, reliability, customer service and quality. Other companies claim to be leaders with incredible power levels, but the results speak for themselves.

Q: What Separates Whipple From The Competition?

Positive displacement twin screw design has the highest efficiency of all superchargers including roots and centrifugal
Higher efficiency means more power at all rpm levels
Unique Whipple twin screw design provides the largest power gains across entire rpm range
Similar screw compressor design as the Ford GT supercar
Same screw compressor technology that Mercedes has utilized on all their latest vehicles including the 600hp McLaren SLR, E55AMG, S55, CL55, SLK32 and SL55
Dyno proven to produce more horsepower and torque than any other supercharger throughout the entire rpm range.
21st century fuel injection that has more processing power than the factory computer resulting in incredible drive-ability
Whipple designed air-bypass system for unsurpassed fuel economy
Commitment to quality and excellence
Astounding customer support from our well trained, performance enthusiast personnel
Nobody can compare to the OEM packaging and quality of parts Whipple provides
50 state emission compatibility
Unmistakable industry leading fit and finish
100% complete systems ready for an easy installation and trouble free operation
Systems consistently produce very low levels of noise, commonly undetectable
True technological leader in supercharger industry

SUPERIOR ENGINEERING

Our relentless commitment to creating products that exceed the cutting edge of design, performance and quality has given us the reputation as innovators and leaders in the high performance industry. 
Every Whipple product goes through extensive research and development to ensure proper operation in all applications. Our standard development practice involves the measurement of over 100 parameters utilizing our own custom designed data acquisition computers. Measurements include individual cylinder air/fuel ratio from a true wide range Horiba sensor, individual cylinder pressure and cylinder combustion analysis as well as solid-state exhaust gas temperature. Our expert calibration team has over 15 years of OEM experience calibrating the most stringent emission standards such as Super Ultra Low Emission Vehicles (SULEV) and Zero Emission Vehicles (PZEV). No other supercharger company has a more advanced staff in computer technology and emsission friendly products. Every product gets extensive R&D time on either our DynoJet Chassis dyno, our Superflow engine dyno or our Land & Sea propshaft dyno. This ensures that you get maximum power from our product and long, trouble free operation.
Characteristic Whipple Charger Centrifugal Turbo Roots
Response Awesome idle-to-redline rpm power. No lag. Poor low-speed response, similar to "turbo lag." Poor low-speed response. Turbo lag. Good low to mid range power.
Driveability Increased lugging ability in higher gears. Increased power throughout rpm range. Must downshift to maintain boost level. Must downshift to maintain boost level. Increased lugging ability in higher gears.
Engine Torque Curve Virtually flat curve; ideal characteristic. Often worse than uncharged engine at low speeds. Often worse than uncharged engine at low speeds. Wide range; fall-off can occur at high speeds.
Heat Buildup Low; intercoolers are usually not needed. Low; intercoolers are usually not needed. High; may need intercooler High; limits boost available.
Noise Very low noise levels. Typically very noisy. Very low noise levels. Typically very noisy.
Adiabatic Efficiency 70-80% 60-78% 60-75% Peak 40-55%
If you’re interested in building your own supercharger packages for kit to resale to the general public, there is no better supercharger than a Whipple Twin Screw Compressor. OEM manufactures utilize positive displacement superchargers due to their incredible throttle response and drive-ability of a big cubic inch motor. When building a system for the consumers, you must provide a very broad power ban with a high peak horsepower level, only the screw compressor can give you this. This is due to the high adiabatic (up to 80%) and volumetric efficiency levels (up to 99.9%). The Whipple screw compressor is the latest generation, durable and dependable performance-enhancing item ever designed for either low boost or high boost levels. Available in a complete unit or a “rotor assembly” for builders own housings. 
The screw compressor is by far the best supercharger available today; it’s the only supercharger to provide a positive displacement design for maximum low-end torque as well as high efficiency for maximum top-end horsepower. No other supercharger in the world can offer the same unique benefits. Centrifugals and turbos have tremendous lag time during shift points, on-off throttle and off the line boost. Roots-type superchargers have been proven to not be very efficient, especially at higher boost levels. Whipple Superchargers has a variety of screw compressors for all types of applications, anywhere from a 100 cubic inch compressor to the 510 cubic inch compressor. Whipple also has a wide assortment of drive lengths, pulley combinations and bypass valves for all types of applications. 

EXCLUSIVE NEW FEATURES

Manufactured in the USA
Comparison data shows a significant improvement (W140ax-Green) vs. the previous generation 2.3 liter (Blue) on back-to-back testing.
Superior noise level in comparison to previous design, virtually noise free operation.
High flow rotor coating for increased efficiency and increased durability.
Increased bearing lubrication for lower operating temps and increased durability.
Serviceable supercharger, replaceable and upgradeable component design.
More robust design, double angular front bearing and sealed roller rear bearing for improved reliability.
Oil sight glass for proper oil level inspection.
100,000 mile oil change intervals.
Model Displacement Max Continuous RPM Max Peak RPM Max CFM Max M^3/HR Max PSI Peak VE Peak AE SC Blueprint (PDF)
W100AX 1.6 Liter/rev 18,000 20,000 1120 1902 30 99 81 100AX
W140AX 2.3 Liter/rev 18,000 18,000 1430 2430 30 99 80 140AX
W140R 2.3 Liter/rev 18,000 18,000 1389 2360 30 95 77 140R
W175AX 2.9 Liter/rev 18,000 18,000 1720 2922 30 99 78 175AX
W200AX 3.3 Liter/rev 16,000 18,000 2140 3635 30 99 78 200AX
W200R 3.3 Liter/rev 16,000 18,000 2030 3449 30 94 76 200R
W245AX 4.0 Liter/rev 16,000 18,000 2518 4278 30 99 78 245AX
W305AX 5.0 Liter/rev 18,000 20,000 3462 5882 30 98 77 305AX
W305R 5.0 Liter/rev 18,000 20,000 3250 5522 30 93 75 305R
W510AX 8.3 Liter/rev 11,000 12,000 3462 5882 30 98 77 510AX
W510R 8.3 Liter/rev 11,000 12,000 3250 5522 30 93 75 510R

WHAT SEPERATES THE WHIPPLE FROM THE COMPETITION

  • Positive displacement twin screw design has the highest efficiency of all superchargers including roots and centrifugal
  • Higher efficiency means more power at all rpm levels
  • Unique Whipple twin screw design provides the largest power gains across entire rpm range
  • Latest screw compressor rotor profile designed today, offering superior flow vs. efficiency vs. physical dimensions
  • Conformal rotor coating for increased performance
  • Lowest tolerance level of all aftermarket positive displacement superchargers, offering the highest quality
  • Low tolerance levels increase performance across entire rpm operating range
  • Double angular front bearings for superior strength and durability
  • Rear roller bearing, with double seal for superior durability
  • Precision cut helical gears for precise rotor clearances, for superior performance and low noise levels
  • Rear bearing out design for increased clearance for packaging restraints
  • Serviceable and upgradable design for superior longevity
  • Similar screw compressor design as the Ford GT supercar
  • Similar screw compressor technology that Mercedes has utilized on all their latest vehicles including the 600hp McLaren SLR, E55AMG, S55, CL55, SLK32 and SL55
  • Dyno proven to produce more horsepower and torque than any other supercharger throughout the entire rpm range
  • Industry leading near-zero noise levels (db)
  • 100,000 mile oil change intervals
  • Marine approved rotor coating
  • Unmistakable industry leading fit and finish
  • True technological leader in supercharger industry

SUPERCHARGER COMPARISON

Whipple Charger Centrifugal Turbo Roots ResponseAwesome idle-to-redline rpm power. No lag.Poor low-speed response, similar to "turbo lag."Poor low-speed response. Turbo lag.Good low to mid range power. DriveabilityIncreased lugging ability in higher gears. Increased power throughout rpm range.Must downshift to maintain boost level.Must downshift to maintain boost level.Increased lugging ability in higher gears. Engine Torque CurveVirtually flat curve; ideal characteristic.Often worse than uncharged engine at low speeds.Often worse than uncharged engine at low speeds.Wide range; fall-off can occur at high speeds. Heat BuildupLow; intercoolers are usually not needed.Low; intercoolers are usually not needed.High; may need intercoolerHigh; limits boost available. NoiseVery low noise levels.Typically very noisy.Very low noise levels.Typically very noisy. Adiabatic Efficiency70-85%60-80%65-80% Peak30-65%
Inlet Phase – The male and female rotors rotate counter to each other. As the lobes of each rotor travel past each inlet port, air is trapped between consecutive lobes and the cylindrical casing. The air moves axially (forward) throughout the case and fill the inner-lobe space between adjacent lobes. 
Compression Phase – As the rotors mesh, the air is trapped between the rotors and the casing. Continued rotation progressively reduces the space occupied by the air causing compression. 
Discharge Phase – Compression continues until the inner-lobe space becomes exposed to the outlet port, through which the air is discharged into the manifold. 
The compression sequence continues on all rotor segments simultaneously. Timing gears synchronize the rotors. The rotors do not touch the casing or each other thus assuring long life, consistent performance and low parasitic losses.
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