Re: Eythenol Trouble
If I understand you correctly, you get it up on a plane and it goes to max (correct) RPM (which is 4400-4800 rpm) THEN it slows or pulls back to some lower RPM?
You probably need to replace your filters, check the fuel tank for debris that could be blocking the fuel pickup screen and yes you may need to rebuild or replace your carb.... but it's not due to using Gas+10% ethanol.
The mechanic is mistaken about ethanol causing problems in the carb. except If you were attempting to run E85, you WILL have REAL problems.
Running gasoline with 10% ethanol will not cause those types of problems.
My 460 ran for years on all types of gasoline including California Reformulated gasoline and gasoline containing 10% ethanol. I took the carb apart thinking I had problems and the only thing wrong with that carb was the gaskets were destroyed from taking it apart. It was absolutely clean inside and all the rubber parts were fine. It was a 1987 model and had never been touched..... I still rebuilt it and put it back on since I ruined the gaskets getting it apart.
I have since sold the long block and I kept the carb. It's going on the 292 Y-block in my 1955 Ford F-600.
My 460 had other problems that you're gonna have but they're not related to fuel. You have my deepest sympathy just for having an OMC 460!
Get it running and sell it. But not to someone that hangs out here on iBoats.
Regards,
Rick
I have an OMC 460 King Cobra. I noticed that when cruising along on plane, I will start loosing some RPMs. A machanic told me that it was the Eythenol in the fuel that is eatting the rubber away in the carb causing it to block fuel to enter the engine at high RPMs. Has anyone else had this problem? And do I need to rebuild my carb every year? What are my options?
