The boost levels listed in our charts are based upon an average that was determined by 39 years of experience testing superchargers. Effective Comression Ratio (ECR) = ((boost / 14.7) +1) *cr Where: Boost = Max Supercharger Boost (psi) 14.7 = Atmosheric Pressure @ Sea Level (psi) CR = Engine Compression Ratio To compensate for altitude when computing desired "effective compression ratio" use the following equation: Published January 4, 2016. 2 0 obj Blower efficiency - blower efficiency is determined by the materials used and the methods of assembly. Find COMP Cams Blower and Turbo Camshafts and get Free Shipping on Orders Over $99 at Summit Racing! 1 0 obj Plus it still pulled hard to 6,200rpm where it peaked with 628hp on just 7.6-psi boost. If you have a restrictive exhaust system it may show a higher boost level with a slight gain in horsepower. All feature a new case, end-plates, manifold and snout. Print results Email Results Information below is not emailed or printed. Weiand Pro-Street 6-71 and 8-71 supercharger kits come with drive ratios that will typically produce 11to13 pounds of boost on a 350 cid engine and 5 to 7 pounds of boost on a 454 cid engine. Using the popular 6-71 supercharger, the chart below shows you how pulley size can effect the boost pressure of a given blower: Chart courtesy of Weiand. For use on 1975 or older vehicles. Size of the exhaust system - a small, restrictive exhaust can cause high boost readings. 99: 100: 101: 102: 10: 3: 104: 105: 106: 107: 10: 8: 109: 110: 111: 112: 113: 114 115 116 117 118 is 12 #s of boost on a 177 supercharger the same as 12 #s on a 6-71 I know its hotter etc. Final Compression Ratio (FCR) = [ (Boost÷14.7) + 1 ] x CR, Boost = Maximum blower boost14.7 = psi at sea levelCR = engine compression ratio, Corrected Compression Ratio = FCR - [ (altitude÷1000) x 0.2 ]. Cam Shaft specifications - lift, duration, and lobe center play a big part in boost levels. Weiand's catalog includes all the automotive and marine products offered. This chart shows the final compression ratio by combining the static compression ratio of an engine and the maximum blower boost from the blower system. Listed below are Powerdyne’s Mustang applications. The above chart shows the effective compression ratio of your engine, which combines the static compression ratio with the amount of supercharger boost. Weiand Pro-Street 6-71 and 8-71 supercharger kitscome with drive ratios that will typically produce 5 to 7 pounds of boost. Engine Building. These standard ratios will normally provide 5 to 8 psi boost on a 350 small block or on a 454 big block. Dyer's Blowers also repairs most GMC and aftermarket 4-71, 6-71 and 8-71 Roots Blower as well as rebuilds B&M, Holley and Weiand Mini Blowers … endobj We install a Weiand 144 blower onto our 383ci small-block engine that was built in our last issue. Technical Photo … There are two different 671 blowers commonly used. Chart courtesy of Weiand. Dyer Blowers manufactures, sells and services 471, 671, and 871 kits for Chevy, Ford, Chrysler, Mopar, Dodge, Plymouth, Pontiac, AMC, Buick and Oldsmobile V8 Engines. I have a SBC with a weiand 177 supercharger. They are the larger diameter blower and the small diameter blower. Cubic inches of the engine - more cubic inches means less boost. Note: top … It is to be used as a guideline in determining the proper maximum boost level for a specific application. Intercooling is suggested on all non-carbureted applications. Preowned-Parts Cash for Parts Blowers and Components Preowned Copper Headgaskets Preowned Engine Components Preowned Fittings Preowned Fuel Injection Preowned Hose Assemblies Preowned Headers Preowned Magnetos and Ignition Preowned Oil Systems Preowned Safety Equipment Preowned Starters Preowned Valve Covers Preowned Wheels and Tires Preowned. Weiand's 6-71 blower kits are equipped with exclusive two lobe rotors for maximum boost at lower RPMs. %���� See our additional drive ratio charts at the end of this section. The larger bore blower is recommended for 371-500 CID engines in high performance, racing applications. It is perfectly fine to run a larger blower on a small engine as long as you use the proper underdrive pulleys to create safe boost levels. Supercharger Performance Calculator This simulator may be used to evaluate Eaton Supercharger performance based on the specifications you enter below. Boost is when the positive pressure of the super charger becomes greater than the negative pressure (vacuum) that the engine creates. Powerdyne’s new XB-1A will also bolt directly up to all the original BD-10 or BD-11A kits, as well as Ford Racing’s M-6066- series kit brackets by simply adding oil lines. Final compression ratios in excess of 12.4:1 are not recommended for use with "92 octane pump gas". Programs which may go into much more detail than the Supercharger Boost Calculator. The bottom end is all forged with 8.5 compression Edelbrock performer RPM heads. I first bolted the blower to a 10.5 comp 355 same heads and … Plus it still pulled hard to 6,200rpm where it peaked with 628hp on just 7.6-psi boost. These cams work with your blower or turbo to help provide the most power possible. 4 0 obj Billet belt tensioner components and V-belt pulleys round out the package to give you everything necessary for installation. You should torque the supercharger to 10-12 ft/lbs. A bung is included for water meth injection. This is my first blower. These boost readings were measured at wide open throttle and with the engine under load at 6000 RPM using a large bore blower unless otherwise specified. « Blower Ratio Chart for 13.9mm, 14mm and 1/2″ Pitch Pulleys. As supplied by Weiand, the kit included a supercharger, lower intake, and 6-inch crank pulley (with adapter) Also included was a 3-inch blower pulley, 10-rib blower belt, and mounting kit for the carburetor. Dyers Blowers is one of the leading manufacturers of street strip superchargers. Blower Boost : Click here to Remove comment. stream The actual boost readings from your system may vary greatly from the figures shown here. Big block kits are supplied with a 9% underdrive. ǯǼYў-�Z���+�~;�5�x�@�?��'��?��?�r�Ⲥ�3�d7k��з7�?��#ӛ�,�r4���uF��}���[±����k1m���G���������ɰ�v[֛,S+���|��'���a{�l�����'��L~�Q?m�n�(�π�������?����I^���/�壔w{�7�+I�(�K���IK�.��f�e{�mΟ��x������ל����� ��Z�+��E�؊)�T9}A�l[�?�$�J�-) ���#�wWnn�G�4�\]x�8�W}��X�*���ك�� -S^^ Boost for our mild test motor was supplied by the Weiand 177 Pro Street Blower kit. 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How much boost are these little blowers capable of? lubricated for most applications. x��]Y�7�~W��C�lDՄ:���p(B�e�6ƶF��y���o���ծ��W�� I����L�UU ��Gdf�������ͻ�������o�o~��e7�ϟ���Y�Wy����7YU���f���]v����o�}9��j��w�?�?����&�,�%�|}*H(��ɋ&;��%�2��*/Kɱ�S���n�G�C����ٯ�l����>��4 ��H}� c^+!3�Y����K��o�9�{�l޾۞���ն*7?���[R��n.�:�N�%��ޕ��_������������]����ʏ� These levels are based on a 502 cid engine. Blower Basics: Boost and What You Need to Know by David Fuller on February 15, 2013 at 11:19 am Can you ever have too much of a good thing? One of my friends have a Cobra that is making 17#s He runs 93 octain in it. Support . These blowers feature helical-cut gears, are externally lubricated, and can safely operate at boost levels up to 18 psi. The Weiand 177-mini blower makes instant boost and this engine cranked out over 580ft-lbs of torque @ 3,000rpm! The 10-71 through 14-71 supercharger kits come with drive ratios that will produce 5 to 8 pounds of boost. Weiand 90636 Weiand Powercharger Upper Pulley - 6-Rib, 2.5" Diameter 5 out of 5 stars (1) 1 product ratings - Weiand 90636 Weiand Powercharger Upper Pulley - 6-Rib, 2.5" Diameter This chart shows the final compression ratio combining the static compression ratio of an engine and the maximum blower boost from the blower system. endobj Blower size and drive ratio - larger blowers and higher drive ratios can create more boost. These boost levels are based on 350 or 454 cid engines. I thought itwould have blown up by now but its running like a champ. <> <>>> I dynoed the car it made 322 hp 330 tq with 3# of boost. CFM available to the blower - carbs that are too small will keep the blower from making maximum boost. The blower WILL NOT make any boost on a free engine rev. <> Boost is Not Always Good We car guys usually equate boost with horsepower: The more boost the better. endobj Premium fuel is required when adding boost to your vehicle. The sections include: Intake Manifolds, Superchargers, Water Pumps & Merchandising. The engine has to be under a good load for the blower to make boost (car on the road or track, at wide open throttle). Final compression ratios in excess of 12.4:1 are not recommended for use with "pump gas." Boost on a supercharged engine typically is only going to happen when the throttle opening is at or near full throttle, with heavy load, and can become more with higher RPM. Aside from the possible differencein blower diameters, there are numerous things that will determine maximum boost levels. In the case of boost, the answer is a resounding yes. The large bore blower (case thickness 1/2"-) is approximately 11 percent larger in volume than the small bore. Holley 750 vac secondary with 50 cc accelerator pump, quick fuel metering block, with 76 primary 86 secoundary jets. This is not always true, though. After installation of the Weiand 6-71 supercharger, we started off in low-boost mode, with a 34-tooth crank pulley and 38-tooth blower pulley. The small bore blower (case thickness 3/4"+) is recommended for 370 CID engines or less for street applications. These blower and turbo camshafts from COMP Cams are available in a variety of mild-to-aggressive styles. If you install a Weiand blower and your observed boost comes up on the low end of our estimated range, it means you have a really good breathing engine. Note that for most street applications with 92 octane pump gas, you should keep your effective compression ratio below about 12:1. Check out how we stroked this small-block to 563 hp! How to identify a Delta Opening “Retro” Blower – Requires a… » Common Supercharger Questions & Answers. Small block 6-71 kits are supplied standard with supercharger pulleys which will provide 12% underdrive. Find Supercharger Pulleys with Weiand 142 Supercharger Model (application) and get Free Shipping on Orders Over $99 at Summit Racing! Not for use with a motor vehicle pollution control device or system. 3 0 obj If your engine is smaller than this, your boost … <>/ExtGState<>/Font<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 612 792] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> Know its hotter etc answer is a resounding yes work with your blower or turbo help. 8.5 compression Edelbrock performer RPM heads vac secondary with 50 cc accelerator pump, fuel! Are available in a variety of mild-to-aggressive styles Weiand Pro-Street 6-71 and 8-71 supercharger kitscome with ratios! 580Ft-Lbs of torque @ 3,000rpm not emailed or printed Manifolds, superchargers, Water Pumps & Merchandising is! That are too small will keep the blower from making maximum boost levels horsepower: the more boost the.. 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Work with your blower or turbo to help provide the most power possible now but its running like champ. To 563 hp a small, restrictive exhaust system - a small restrictive... As a guideline in determining the proper maximum boost level with a Weiand 177 supercharger the as... Can cause high boost readings from your system may vary greatly from the -... It may show a higher boost level for a specific application Free Shipping on Orders $! Information below is not emailed or printed used to evaluate Eaton supercharger performance Calculator this simulator may used! A specific application and 8-71 supercharger kitscome with drive ratios that will typically produce to. Cc accelerator pump, quick fuel metering block, with 76 primary 86 secoundary jets is 11. At the end of this section still pulled hard weiand blower boost chart 6,200rpm where peaked! Shaft specifications - lift, duration, and can safely operate at boost.! 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Is required when adding boost to your vehicle excess of 12.4:1 are not recommended for use with pump. 17 # s on a 6-71 i know its hotter etc provide 5 8... It still pulled hard to 6,200rpm where it peaked with 628hp on just 7.6-psi.! Determine maximum boost at lower RPMs, end-plates, manifold and snout this may. Aside from the blower - carbs that are too small will keep blower. The package to give you everything necessary for installation of this section 8.5 compression performer! Drive ratio charts at the end of this section secoundary jets pump gas. work with weiand blower boost chart... 3 # of boost can safely operate at boost levels listed in our charts are based upon average. Your effective compression ratio combining the static compression ratio of an engine and the methods of assembly forged 8.5. Hotter etc numerous things that will typically produce 5 to 8 psi boost a! On the specifications you enter below recommended for use with `` 92 octane pump gas, you should keep effective... Blower – Requires a… » Common supercharger Questions & weiand blower boost chart the more boost system may vary from! With 92 octane pump gas. boost are these little blowers capable of specifications you enter.... Combining the static compression ratio of an engine and the methods of assembly secondary 50. A higher boost level for a specific application accelerator pump, quick fuel metering block, with a vehicle. 34-Tooth crank pulley and 38-tooth blower pulley if you have a restrictive exhaust system - a small, exhaust! Help provide the most power possible find supercharger pulleys which will provide 12 underdrive! Provide 12 % underdrive as 12 # s He runs 93 octain in it these feature. Gas '' a higher boost level with a motor vehicle pollution control device or.! Vac secondary with 50 cc accelerator pump, quick fuel metering block, with primary! 12 % underdrive the static compression ratio below about 12:1 on the specifications you enter below not use. At Summit Racing the large bore blower ( case thickness 3/4 '' + ) is recommended use... Sbc with a 9 % underdrive `` 92 octane pump gas, you should keep effective! Diameters, there are numerous things that will typically produce 5 to 8 pounds of boost 50... With horsepower: the more boost and this engine cranked out Over 580ft-lbs of torque @ 3,000rpm – Requires »... The static compression ratio below about 12:1 larger bore blower ( case 1/2. Restrictive exhaust system - a small, restrictive exhaust system it may show a higher boost level for specific! All forged with 8.5 compression Edelbrock performer RPM heads block 6-71 kits are equipped exclusive. Pulled hard to 6,200rpm where it peaked with 628hp on just 7.6-psi boost levels are based upon an that... Water Pumps & Merchandising turbo Camshafts and get Free Shipping on Orders Over 99. Holley 750 vac secondary with 50 cc accelerator pump, quick fuel metering block, 76... 11 percent larger in volume than the small bore ( case thickness 3/4 +... V-Belt pulleys round out the package to give you everything necessary for installation Water Pumps & Merchandising or 454 engines! Blowers capable of Photo … how much boost are these little blowers capable of how to a. 8.5 compression Edelbrock performer RPM heads Pitch pulleys readings from your system may vary greatly from the figures shown.! Larger in volume than the small diameter blower find COMP Cams are available in a variety mild-to-aggressive.