Intercooling is suggested on all non-carbureted applications. Weiand's 6-71 blower kits are equipped with exclusive two lobe rotors for maximum boost at lower RPMs. The large bore blower (case thickness 1/2"-) is approximately 11 percent larger in volume than the small bore. 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. stream I dynoed the car it made 322 hp 330 tq with 3# of boost. Boost for our mild test motor was supplied by the Weiand 177 Pro Street Blower kit. There are two different 671 blowers commonly used. 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. If you have a restrictive exhaust system it may show a higher boost level with a slight gain in horsepower. We install a Weiand 144 blower onto our 383ci small-block engine that was built in our last issue. Technical Photo … Size of the exhaust system - a small, restrictive exhaust can cause high boost readings. Holley 750 vac secondary with 50 cc accelerator pump, quick fuel metering block, with 76 primary 86 secoundary jets. is 12 #s of boost on a 177 supercharger the same as 12 #s on a 6-71 I know its hotter etc. The actual boost readings from your system may vary greatly from the figures shown here. %���� 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. Print results Email Results Information below is not emailed or printed. These standard ratios will normally provide 5 to 8 psi boost on a 350 small block or on a 454 big block. Boost is when the positive pressure of the super charger becomes greater than the negative pressure (vacuum) that the engine creates. 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. Final compression ratios in excess of 12.4:1 are not recommended for use with "92 octane pump gas". These blowers feature helical-cut gears, are externally lubricated, and can safely operate at boost levels up to 18 psi. Premium fuel is required when adding boost to your vehicle. Published January 4, 2016. endobj I thought itwould have blown up by now but its running like a champ. <> Support . It is to be used as a guideline in determining the proper maximum boost level for a specific application. Plus it still pulled hard to 6,200rpm where it peaked with 628hp on just 7.6-psi boost. They are the larger diameter blower and the small diameter blower. lubricated for most applications. 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 These levels are based on a 502 cid engine. CFM available to the blower - carbs that are too small will keep the blower from making maximum boost. Weiand Pro-Street 6-71 and 8-71 supercharger kitscome with drive ratios that will typically produce 5 to 7 pounds of boost. The small bore blower (case thickness 3/4"+) is recommended for 370 CID engines or less for street 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� This is my first blower. 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. Cam Shaft specifications - lift, duration, and lobe center play a big part in boost levels. Check out how we stroked this small-block to 563 hp! endobj All feature a new case, end-plates, manifold and snout. For use on 1975 or older vehicles. Blower Boost : Click here to Remove comment. Listed below are Powerdyne’s Mustang applications. Note: top … Find Supercharger Pulleys with Weiand 142 Supercharger Model (application) and get Free Shipping on Orders Over $99 at Summit Racing! Dyer's Blowers also repairs most GMC and aftermarket 4-71, 6-71 and 8-71 Roots Blower as well as rebuilds B&M, Holley and Weiand Mini Blowers … Using the popular 6-71 supercharger, the chart below shows you how pulley size can effect the boost pressure of a given blower: Chart courtesy of Weiand. Blower size and drive ratio - larger blowers and higher drive ratios can create more boost. I have a SBC with a weiand 177 supercharger. ǯǼYў-�Z���+�~;�5�x�@�?��'��?��?�r�Ⲥ�3�d7k��з7�?��#ӛ�,�r4���uF��}���[±����k1m���G���������ɰ�v[֛,S+���|��'���a{�l�����'��L~�Q?m�n�(�π�������?����I^���/�壔w{�7�+I�(�K���IK�.��f�e{�mΟ��x������ל����� ��Z�+��E�؊)�T9}A�l[�?�$�J�-) ���#�wWnn�G�4�\]x�8�W}��X�*���ك�� -S^^ The blower WILL NOT make any boost on a free engine rev. The 10-71 through 14-71 supercharger kits come with drive ratios that will produce 5 to 8 pounds of boost. 4 0 obj 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). 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. Cubic inches of the engine - more cubic inches means less boost. See our additional drive ratio charts at the end of this section. 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. 1 0 obj The bottom end is all forged with 8.5 compression Edelbrock performer RPM heads. 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Billet belt tensioner components and V-belt pulleys round out the package to give you everything necessary for installation. This chart shows the final compression ratio combining the static compression ratio of an engine and the maximum blower boost from the blower system. These cams work with your blower or turbo to help provide the most power possible. The larger bore blower is recommended for 371-500 CID engines in high performance, racing applications. 3 0 obj %PDF-1.5 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. A bung is included for water meth injection. 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? « Blower Ratio Chart for 13.9mm, 14mm and 1/2″ Pitch Pulleys. In the case of boost, the answer is a resounding yes. Supercharger Performance Calculator This simulator may be used to evaluate Eaton Supercharger performance based on the specifications you enter below. 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. How to identify a Delta Opening “Retro” Blower – Requires a… » Common Supercharger Questions & Answers. One of my friends have a Cobra that is making 17#s He runs 93 octain in it. 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 ]. Engine Building. If your engine is smaller than this, your boost … Programs which may go into much more detail than the Supercharger Boost Calculator. 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: Blower efficiency - blower efficiency is determined by the materials used and the methods of assembly. Aside from the possible differencein blower diameters, there are numerous things that will determine maximum boost levels. Chart courtesy of Weiand. Weiand's catalog includes all the automotive and marine products offered. Not for use with a motor vehicle pollution control device or system. These blower and turbo camshafts from COMP Cams are available in a variety of mild-to-aggressive styles. endobj Final compression ratios in excess of 12.4:1 are not recommended for use with "pump gas." <>/ExtGState<>/Font<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 612 792] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> 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. The Weiand 177-mini blower makes instant boost and this engine cranked out over 580ft-lbs of torque @ 3,000rpm! The above chart shows the effective compression ratio of your engine, which combines the static compression ratio with the amount of supercharger boost. Find COMP Cams Blower and Turbo Camshafts and get Free Shipping on Orders Over $99 at Summit Racing! <>>> These boost levels are based on 350 or 454 cid engines. It is to be used as a guideline in determining the proper maximum boost level for a specific application. You should torque the supercharger to 10-12 ft/lbs. 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. The boost levels listed in our charts are based upon an average that was determined by 39 years of experience testing superchargers. Note that for most street applications with 92 octane pump gas, you should keep your effective compression ratio below about 12:1. This is not always true, though. Dyers Blowers is one of the leading manufacturers of street strip superchargers. <> 99: 100: 101: 102: 10: 3: 104: 105: 106: 107: 10: 8: 109: 110: 111: 112: 113: 114 115 116 117 118 How much boost are these little blowers capable of? Small block 6-71 kits are supplied standard with supercharger pulleys which will provide 12% underdrive. 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