Re: Why do blower motors surge?
If you are talking about a big olfd fashioned roots blower, there are a few factors like camshaft design, but one specific to the blower is that as the rotors turn, they take big gulps off air which is not so smooth and the charge pulses. The more rotors you have and the more helical they are, the less they pulse and the smoother the idle. This is why the latest blowers have 4 lobes and 160 degree cut rotors.
1973 RS Z28: 401ci Dart Little M, Littlefield 8-71 supercharger @14lbs boost, Callies Magnum crankshaft, Lunati Pro-Mod rods, JE pistons, 7.8:1 compression, AFR 227 Comp heads, T&D 1.6 shaft rockers. Reed solid FT cam (240/250@.050, .523/.542 lift, 112 LSA), QFT 750 carbs, Tremec TKO-500, Lemons headers, Moser 12 bolt, 33 spline axles & 3.42 gears