How hard do you normaly run your engine
02-22-2011, 11:23 AM
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02-22-2011, 07:27 PM
#56
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Blue,
I tried some 2.5 PV's but they would open to late for comfort. One thing I did learn testing with an AFR gauge, is that the Holley carb is pretty amazing. From 3500-5500 RPM (this was I fast as I was willing to stare at the gauge vs driving the boat) the jets alone would hold the AFR at 13.6-13.5 at all RPM's...how does it know? These carbs are as smart as my cell phone...
When he PV's open, the AFR drops to 12.2 12.4. This is some richer than I would target, but I guess the way to lean it some would be with larger high speed air bleeds. You can figure this out and then give me some good direction.
I tried some 2.5 PV's but they would open to late for comfort. One thing I did learn testing with an AFR gauge, is that the Holley carb is pretty amazing. From 3500-5500 RPM (this was I fast as I was willing to stare at the gauge vs driving the boat) the jets alone would hold the AFR at 13.6-13.5 at all RPM's...how does it know? These carbs are as smart as my cell phone...
When he PV's open, the AFR drops to 12.2 12.4. This is some richer than I would target, but I guess the way to lean it some would be with larger high speed air bleeds. You can figure this out and then give me some good direction.
02-23-2011, 12:22 PM
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You must be n/a Ben, that would be way lean for me. I set my carbs up fat and for the PV to switch early to avoid that lean spot just before they open. I use the LM2 and see the same thing when the PV open. The real fun though is WOT a/f readings 
