HELP! Oil in Gas - Team Camaro Tech
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post #1 of 2 (permalink) Old Oct 22nd, 05, 03:32 PM Thread Starter
 
Join Date: Oct 2005
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HELP! Oil in Gas

My dad just bought a 69 camaro with a 427. It is a race only car. It has an electric fuel pump, good compression, good plugs. It has a holly carburator. The floats are set right. The engine seems to run great, but after only about 5 minutes of running it the oil smells like gasoline, and is dark grey. At first I thought maybe someone left the fuel pump on and it seeped through the needle and seat, but we changed the oil, and ran it for a while, and the same thing happened. I don't think after changing the oil there would have been enough gas left in the crankcase to make the oil change color. Could it be seeping through the rings while it is running. I would think it would be running way too rich if that were the case. I'm grasping at straws. Any ideas?
bobbys1967 is offline  
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post #2 of 2 (permalink) Old Oct 22nd, 05, 05:30 PM
 
Join Date: Sep 2004
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Re: HELP! Oil in Gas

You mentioned that the engine has good compression. Did you run a compression check to be sure the rings are sealing in every cylinder? Sounds like you are either so rich that the gas is running past the rings and washing down the cylinder walls, or the rings are worn out enough to allow excessive blowby of fuel and air. Has the oil level risen? I'd check that as well, because if that much fuel is getting past, the level would rise. Needles and seats could cause the issue. Excessive fuel pressure can also force fuel past the needles and seats. If the plugs look good, I'd lean more toward a cylinder or two with weak rings. How many runs were on the engine when the car was purchased? When we used to drag race, we'd get about 200-300 runs on a set of rings and bearings. Unburned fuel in the crankcase plus heat might result in some problems, so you may want to run some more checks.
Bob Brissie is offline  
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