08-22-2016, 08:10 PM
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CC Member
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Join Date: May 2006
Location: St. Louisville,
Oh
Cobra Make, Engine: A&C 67 427 cobra SB
Posts: 2,445
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Not Ranked
Quote:
Originally Posted by Texasdoc
Good news - springs worked! Pulls up above 5000 rpm. No missing, however it does need tuning. It doesn't seem to be as quick as it should be. Seems like it runs out of steam around 4500 rpm. Still runs very rich off idle and stays rich throughout the run. Low power cruise at 40 mph around 1800 rpm, it is around 11-12:1. Seems like this would still be in the transition circuit. It leans out a bit (relatively to 13:1) at WOT closer to 4000 rpm, so I think the jets are fine.
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11-12:1 at cruise is way too rich. It will wash the oil off your cylinder walls and wear out your rings, cylinder walls, and piston skirts. Your should be much closer to 14.7:1 at cruise.
WOT - most expert advice I read says 12.5:1 is about where maximum power is made. Some engines will make maximum power at 13:1, but a lot of engines will detonate this lean.
I would get the fuel right ASAP. |
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