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NoDOHC · 07-13-2010, 10:11 PM

Shaft degrees makes more sense in the diagram (the rotor would have moved quit a bit further at 90 degrees). I think I was second guessing myself.

The reason I consider the ignition event to be at 20 BTDC is that there is observeable flame front propagation before 0 degrees, which excludes the ATDC option. It is strange that they neglect to indicate ATDC or BTDC.

I saw the reference earlier, I meant where did you find the paper? Is that an SAE paper?

This explains what I saw in several articles about trailing plug positioning, that further up the housing (rotor clears it earlier) is preferred for peak power.

edit: It would be really awesome to see what the flame front does at 7,000 rpm....

07-13-2010, 10:11 PM	#43
NoDOHC The quest for more torque Join Date: Sep 2008 Location: Sheboygan, Wisconsin Posts: 855 Rep Power: 17	Shaft degrees makes more sense in the diagram (the rotor would have moved quit a bit further at 90 degrees). I think I was second guessing myself. The reason I consider the ignition event to be at 20 BTDC is that there is observeable flame front propagation before 0 degrees, which excludes the ATDC option. It is strange that they neglect to indicate ATDC or BTDC. I saw the reference earlier, I meant where did you find the paper? Is that an SAE paper? This explains what I saw in several articles about trailing plug positioning, that further up the housing (rotor clears it earlier) is preferred for peak power. edit: It would be really awesome to see what the flame front does at 7,000 rpm.... __________________ 1986 GXL ('87 4-port NA - Haltech E8, LS2 Coils. Defined Autoworks Headers, Dual 2.5" Exhaust (Dual Superflow, dBX mufflers) 1991 Coupe (KYB AGX Shocks, Eibach lowering springs, RB exhaust, Stock and Automatic) Last edited by NoDOHC; 07-13-2010 at 10:14 PM.