Re: Black transom
Sure was running nice as you guys pulled away on the way back :drink:
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Re: Black transom
Mine use to do it when I idled a lot . I heard the 500efi are a little rich at idle .Also heard the high octane. I always ran 93 in it and i put A MSD box on it and it helped ..
Ray @ Raylar your saying they changed the mix/blend recently ???? Rob :drink: |
Re: Black transom
87 and an msd box cleaned mine up like a champ. if you idle around lots it's gonna happen.
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Re: Black transom
Originally Posted by Strip Poker 388
Mine use to do it when I idled a lot . I heard the 500efi are a little rich at idle .Also heard the high octane. I always ran 93 in it and i put A MSD box on it and it helped ..
Ray @ Raylar your saying they changed the mix/blend recently ???? Rob :drink: |
Re: Black transom
How much oil does it "burn"? We had a problem with a simple pcv valve on our F2 race boat. Transom was BLACK after a test run right before the race. It didn't do it unless we were running hard.
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Re: Black transom
I would probably say that it's the fuel. California is more stringent on fuel than most states because of the air polution. Maybe the fuel mixtures/ additives have changed somewhat to be causing this?
I saw a report on consumer affairs about 4 yrs ago when they tested different fuels--87,89,91, there was prctically NO difference in the fuels from a few major brands. :eek: There is actually a big difference in fuel quality between different fuels. They all blend their fuels differently with various additives. I only trust and use 76 or Mobil |
Re: Black transom
I have a pair of hp500's and am experiencing the sooting on the transom. I have been told that it is a common issue with these engines. Also been told that the A/F mixture is fattened up at idle to keep from leaning out at high RPMs. I had some relief work done to the heads and the sooting is not as bad as it used to be. Just my .02 worth.....
I run 89 octane most of the time. |
Re: Black transom
ALL 500 leave sooty transoms... they r set rich at the factory... end of story...lean it out w/ a ecm reprogram
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Re: Black transom
I had this "problem" with my 496. Was also told it is normal for this to happen. Someone suggested I add a K&N intake.
I did that. Less black, and not too lean. |
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