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Black transom

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Old 02-27-2006, 12:04 AM
  #11
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Default Re: Black transom

Sure was running nice as you guys pulled away on the way back
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Old 02-27-2006, 01:21 AM
  #12
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Default 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 ????


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Old 02-27-2006, 08:00 AM
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Default 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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Old 02-27-2006, 09:02 AM
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Default Re: Black transom

Quote:
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
I think he might be refering to the ethanol that is now being blended with most pump fuels.
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Old 02-27-2006, 09:17 AM
  #15
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Default 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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Old 02-27-2006, 12:00 PM
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Default 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.

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

Last edited by Semper Fi; 02-27-2006 at 12:05 PM.
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Old 02-27-2006, 12:20 PM
  #17
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Default 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.
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Old 02-27-2006, 04:11 PM
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Default 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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Old 02-27-2006, 04:45 PM
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Default 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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