Re: Fuel in oil.
[Re: Greenwood]
#2962992
09/11/21 02:21 PM
09/11/21 02:21 PM
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Joined: Nov 2003
Posts: 1,362 Out of the State of Confusion
blue_stocker
pro stock
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pro stock
Joined: Nov 2003
Posts: 1,362
Out of the State of Confusion
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If you're concerned about compression, do a leak-down test and check your fuel system, especially if you have one of the cheap fuel regulators. I had one that had a leaky diaphragm that ended up with approx 1 qrt of race fuel in my crankcase. The day before going to a test session I had a very hard start and even though I kept smelling gas, I hadn't done basic inspection (look down the throttle bores with the electric pump running) and almost hydrauliced (sic?) a cylinder. The next day I noticed bubbles coming out of the front corner of the oil pan (crankcase pressure) and oil on the trailer deck! So much for that test session, back to the shop! The following day I drained the oil and noticed not only the strong odor of fuel but it was also diluted with gas in the oil pan; glad I didn't make any passes on that fresh engine! Needless to say, I pulled the engine and discovered washed bearings, scuffed cylinder walls but saved myself a big bill from catastrophic engine failure...it's always the little things. Not saying anything about your situation other than, make sure of what you do know so it doesn't bite you!
I predict future happiness for Americans if they can prevent the government from wasting the labors of the people under the pretense of taking care of them. Thomas Jefferson
Freedom must be repurchased by every new generation General Daniel Jones, WW2 Tuskegee Airmen
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Re: Fuel in oil.
[Re: Greenwood]
#2963005
09/11/21 03:03 PM
09/11/21 03:03 PM
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Joined: Jan 2003
Posts: 14,498 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,498
So. Burlington, Vt.
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The jetting seems kinda big for a 780 Holley.
If you have a mechanical pump, I’d could have a diaphragm that’s failing and letting fuel pass through it.
If electric, what’s the pressure set at?
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Fuel in oil.
[Re: fast68plymouth]
#2963068
09/11/21 07:02 PM
09/11/21 07:02 PM
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Joined: Sep 2017
Posts: 342 Red Deer, Alberta
Greenwood
OP
enthusiast
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OP
enthusiast
Joined: Sep 2017
Posts: 342
Red Deer, Alberta
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The jetting seems kinda big for a 780 Holley.
If you have a mechanical pump, I’d could have a diaphragm that’s failing and letting fuel pass through it.
If electric, what’s the pressure set at?
Electric pump. 7-8 psi.
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Re: Fuel in oil.
[Re: Greenwood]
#2963082
09/11/21 07:37 PM
09/11/21 07:37 PM
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Joined: Dec 2012
Posts: 1,823 Wind Gap,Pa.
Sammy
top fuel
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top fuel
Joined: Dec 2012
Posts: 1,823
Wind Gap,Pa.
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The jetting seems kinda big for a 780 Holley.
If you have a mechanical pump, I’d could have a diaphragm that’s failing and letting fuel pass through it.
If electric, what’s the pressure set at?
Electric pump. 7-8 psi. Drop it to 5.5 to 6psi. Secondaries seem too rich. Check your #5;6,7,8 plugs
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