Of course maximum boost is dependent upon the size of the blower, the drive ratio, and a variety of other factors. Using a ratio the blower rpm can be found. As we told you in Blower Basics (Part 1), boost is the amount of air pressure created by your supercharger and is the result of a combination of factors: engine displacement, blower displacement, and blower drive speed. RBS Superchargers is a professional supercharger building and repair service that stocks new and used parts, blower kits and accessories. If the carbs are too small or you are running a restrictive air cleaner this can cause a lower boost. Boost = Maximum blower boost. Telephone: 530-274-FUEL or 530-274-3835 The motor pulley rpm is read from the motor data plate. When a Roots blower turns at the same RPM as the crankshaft, it is said to have a 1:1 drive ratio. A drive ratio of 10% underdrive means when the engine is running 6000 rpms, the blower is running 10% slower or 5400 rpms. So... if we divided 40 into 45, and we get 1.125, then it's the .125 that we are looking for. A proper amount of boost is good—very good. Learn more about: Calculators at ProCharger.com. If the altitude in the area where you normally drive is significantly higher than sea level, then your compression ratios will also vary. The smaller pulley will go around .125 times as fast as the larger pulley, or 12-1/2%. This is why you are wasting your time and energy spinning a 60 degree rotor blower at anything over 20-30% overdrive usually. Performance Trends Inc Producing Quality Computer Tools for Racers and Engine Builders since 1986 Blower speed is a product of the drive ratio – so 25% overdrive = 8750 rpm blower speed on an engine turning 7000 rpm. - engine is a 355 smallblock chevy 9:1 compression im assuming that the blower needs to be under driven or a 1 to 1 ratio how do i calculate to get the proper cog gears? Running a 56-tooth blower pulley and a 50-tooth crank pulley produced a blower drive ratio of roughly 11 percent under-driven (meaning the blower was spinning only 89 percent of the engine speed). The drive ratio of a supercharger is the speed of the supercharger in relation to crank speed. RBS offers a trade in program on all blowers / superchargers. Altitude plays an important role in determining compression ratios. The blower will either spin faster or slower than the crank (or exactly the same if at 1 to 1 ratio). 14.7 = PSI at sea level CR = Engine Compression Ratio. The drive ratio of a Roots blower is critical for establishing a given intake manifold boost level. The blower is used to move a given cubic feet of air per minute through an air conditioning system. A FREE calculator that determines the Supercharger boost based on Displacements, Belt Ratio and Efficiencies. Carburetor size, air cleaner flow, camshaft size and lobe separation, engine load, exhaust size, and blower drive ratio are just a few. Figure 13-2 In the above diagram, (See figure 13-2) the two pulley sizes are known and the rpm of the motor pulley is known. 5.63:1 – For F-3D-102, F-3D-106, F-1X-12, F-3R-121, F-3R-130, F-3R-136, F-3X-140, F-3X-143 Methanol likes lots of air, and lots of boost since it uses twice as much fuel as gasoline. blower. Carburetion, Induction, Nitrous - how to determine blower gear drive ratio? If enough air can’t pass through the blower it …
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