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NoDOHC · 11-15-2010, 07:51 AM

I fixed the rich spot later, but I had the AFR trace off for the next run that I got a picture of.

Although the curves do not line up, the rich spot made the dip in the torque curve. I wish I had a picture of the afr on a run with a 13.3 afr throughout, but once it was good, I was fooling with trailing split and had the afr trace turned off.

Edit:

I should also post here that target AFR was 13.3:1 (optimal power). Ignition timing was fixed at 38degrees BTDC above 3000 rpm.

I was initially running from 3000 rpm, but I had to wait too long between runs for engine cooldown, so I started at 5000 instead to minimize the engine heating. I revved to 9,000 once (182 WHp at 9,0000 rpm) I think I was ignition limited, as my peak VE was reached at 7,700 rpm and my power had long since started to fall off at that point.

BSFC was right around 0.42 lb/Hp.hr until 6,800 rpm, where it started to increase to 0.54 lb/Hp.hr at 9,000 rpm (which also indicates an ignition problem).

Interestingly enough, this engine only barely eaked above 100% VE (I saw 102% at 7,700). Rotary engines have a lot of potential.

11-15-2010, 07:51 AM	#24
NoDOHC The quest for more torque Join Date: Sep 2008 Location: Sheboygan, Wisconsin Posts: 855 Rep Power: 17	I fixed the rich spot later, but I had the AFR trace off for the next run that I got a picture of. Although the curves do not line up, the rich spot made the dip in the torque curve. I wish I had a picture of the afr on a run with a 13.3 afr throughout, but once it was good, I was fooling with trailing split and had the afr trace turned off. Edit: I should also post here that target AFR was 13.3:1 (optimal power). Ignition timing was fixed at 38degrees BTDC above 3000 rpm. I was initially running from 3000 rpm, but I had to wait too long between runs for engine cooldown, so I started at 5000 instead to minimize the engine heating. I revved to 9,000 once (182 WHp at 9,0000 rpm) I think I was ignition limited, as my peak VE was reached at 7,700 rpm and my power had long since started to fall off at that point. BSFC was right around 0.42 lb/Hp.hr until 6,800 rpm, where it started to increase to 0.54 lb/Hp.hr at 9,000 rpm (which also indicates an ignition problem). Interestingly enough, this engine only barely eaked above 100% VE (I saw 102% at 7,700). Rotary engines have a lot of potential. __________________ 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; 11-15-2010 at 08:06 AM.