Recently there has been some talk on selecting a the correct size throttle body for a specific application. Selecting a throttle body is very similar to selecting a carburetor. One important factor is the RPM range of the engine and the WEIGHT of the vehicle. A heavy vehicle that is overcammed or over sized in the intake arena will suffer throttle response(or getting moving) in comparison to a lighter vehicle that doesnt have an inertia issue like our Jeeps. Of course all this only applies to naturally aspirated vehicles. Here are a couple of sites for some food for thought.... http://www.accufabracing.com/article 3.htm http://www.csgnetwork.com/cfmcalc.html
Okay...god info... but. What is the max flow rate in CFM for: Stock TB: Modern Muscle 85mm TB: Arrington 90mm TB: ?
Cfm?? I understand the Arrington to be only 819cfm and that it flows 178 better than stock, which means the stocker is 641cfm. The Modern Muscle throttle body must be in the 700cfm range. I am sending them both off to be flowed of course the question is at what inches or pressure do they(the manufacturer) use to measure?? Which for a stock 370cid/6.1 @6100 only will draw about 550cfm, so much for the 1000cfm cold air intake claims. A modified/race 370cid/6.1@6100 with a VE of assuming 100% (in a perfect world) needs 653cfm. So lets see every millimeter is .039"...that means in the center of the stock throttle body they have removed (83mm) .117" and as it flares out at either end it is .195".....wow thats quite a bit of material. Does that sound right??? ..
