air fuel ratio on a blower motor?
#16
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That's way to lean to be safe at 4000rpm under load. There really is no such thing as a crusing load in a marine engine, it's going uphill all the time and I think those air fuels there should be no higher than 12.2 to 12.5 to be safe, especially with todays rot gut fuels and hot summer temps!
Best Regards,
Ray @ raylar
Best Regards,
Ray @ raylar
#17
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That's way to lean to be safe at 4000rpm under load. There really is no such thing as a crusing load in a marine engine, it's going uphill all the time and I think those air fuels there should be no higher than 12.2 to 12.5 to be safe, especially with todays rot gut fuels and hot summer temps!
Best Regards,
Ray @ raylar
Best Regards,
Ray @ raylar
While that may be acceptable in a car, cruising down the road at 50mph, I can see what you're saying about the boat/load while cruising. It probably takes 25hp to keep the car moving at 50mph on flat ground. It probably takes 400HP per side to keep a 40+ft offshore boat cruising at 55mph.
He was seeing 11.2 under wot conditions. This is a high boost procharger setup. He was thinkin leaning it out to around 11.8 or so at wot. I don't think thats a good idea, especially on a high boost 1200+hp engine...
Any thoughts on that situation??? Its a blow thru carb setup. Since he's lean cruising, my thoughts were to add some more jet in the primary to get cruise afr down, and if it goes below 11.0 at wot, pull a little secondary jet if needed.
#18
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Guessing your are running carbs. If so I would richen up the secondarys a step or 2. You might be getting your soot from your acceleator pumps. I agree with trying to get 11.8 at wot
#19
Charter Member #1171
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No way he is leaning those secondaries !!!!
I just found out he has the clearance for extended tip plugs.
That should help with the fouling at idle .
Id like to throw a jet or two back in the primaries for added security midrange, to close to the edge for my taste.
I just found out he has the clearance for extended tip plugs.
That should help with the fouling at idle .
Id like to throw a jet or two back in the primaries for added security midrange, to close to the edge for my taste.
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#20
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be careful with extended tip plugs and high boost. If you need them to clean up the idle go at least one heat range cooler.