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? 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. These boost levels are based on 350 or 454 cid engines. 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. Intercooling is suggested on all non-carbureted applications. 3 0 obj The small bore blower (case thickness 3/4"+) is recommended for 370 CID engines or less for street applications. 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. 99: 100: 101: 102: 10: 3: 104: 105: 106: 107: 10: 8: 109: 110: 111: 112: 113: 114 115 116 117 118 The blower WILL NOT make any boost on a free engine rev. « Blower Ratio Chart for 13.9mm, 14mm and 1/2″ Pitch Pulleys. A bung is included for water meth injection. The bottom end is all forged with 8.5 compression Edelbrock performer RPM heads. Size of the exhaust system - a small, restrictive exhaust can cause high boost readings. <> See our additional drive ratio charts at the end of this section. Support . These blowers feature helical-cut gears, are externally lubricated, and can safely operate at boost levels up to 18 psi. 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. 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. Aside from the possible differencein blower diameters, there are numerous things that will determine maximum boost levels. This is my first blower. Weiand Pro-Street 6-71 and 8-71 supercharger kitscome with drive ratios that will typically produce 5 to 7 pounds of boost. One of my friends have a Cobra that is making 17#s He runs 93 octain in it. Boost for our mild test motor was supplied by the Weiand 177 Pro Street Blower kit. The 10-71 through 14-71 supercharger kits come with drive ratios that will produce 5 to 8 pounds of boost. Not for use with a motor vehicle pollution control device or system. Dyers Blowers is one of the leading manufacturers of street strip superchargers. 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 ]. The boost levels listed in our charts are based upon an average that was determined by 39 years of experience testing superchargers. These blower and turbo camshafts from COMP Cams are available in a variety of mild-to-aggressive styles. Note: top … I first bolted the blower to a 10.5 comp 355 same heads and … Find Supercharger Pulleys with Weiand 142 Supercharger Model (application) and get Free Shipping on Orders Over $99 at Summit Racing! Check out how we stroked this small-block to 563 hp! 2 0 obj How much boost are these little blowers capable of? It is perfectly fine to run a larger blower on a small engine as long as you use the proper underdrive pulleys to create safe boost levels. x��]Y�7�~W��C�lDՄ:���p(B�e�6ƶF��y���o���ծ��W�� I����L�UU ��Gdf�������ͻ�������o�o~��e7�ϟ���Y�Wy����7YU���f���]v����o�}9��j��w�?�?����&�,�%�|}*H(��ɋ&;��%�2��*/Kɱ�S���n�G�C����ٯ�l����>��4 ��H}� c^+!3�Y����K��o�9�{�l޾۞���ն*7?���[R��n.�:�N�%��ޕ��_������������]����ʏ� I have a SBC with a weiand 177 supercharger. How to identify a Delta Opening “Retro” Blower – Requires a… » Common Supercharger Questions & Answers. ǯǼYў-�Z���+�~;�5�x�@�?��'��?��?�r�Ⲥ�3�d7k��з7�?��#ӛ�,�r4���uF��}���[±����k1m���G���������ɰ�v[֛,S+���|��'���a{�l�����'��L~�Q?m�n�(�π�������?����I^���/�壔w{�7�+I�(�K���IK�.��f�e{�mΟ��x������ל����� ��Z�+��E�؊)�T9}A�l[�?�$�J�-) ���#�wWnn�G�4�\]x�8�W}��X�*���ك�� -S^^ 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 "pump gas." 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