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CC Advertisers
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07-06-2002, 11:39 AM
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CC Member
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Join Date: May 2001
Location: Oak Forest, IL,
IL
Cobra Make, Engine: B&B w/FRPP 347ci 450HP Crate
Posts: 896
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Not Ranked
Smoke out of breathers
I am getting smoke out of my breathers after my second test fire of my rebuilt engine. Has a hint of fuel smell to it. Is this just the junk that should be run through the PCV system that I have not hooked up yet? Is it just assembly lube burning off? Did not notice this on first fire up.
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07-06-2002, 02:34 PM
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The longest build.....
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Join Date: Aug 2000
Location: Midwest, USA,
KS
Cobra Make, Engine: Mid-States, 428 Police Interceptor, TKO 5 speed, Jaguar rearend, Trigos, and Guardsman Blue!!!
Posts: 612
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Not Ranked
What kind of fuel pump???
Mechanical or electric ??
Remember even new mechanical fuels pumps can be defective and allow gas into the crankcase.
Cheers,
Bill Cook
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07-06-2002, 02:58 PM
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CC Member
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Join Date: Aug 2000
Location: Chicago,
IL
Cobra Make, Engine: ERA 454 S.O.
Posts: 1,684
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Not Ranked
Do a compression test (engine hot, remove all spark plugs, and hold the throttle open). Sounds like blow by. Maybe the rings have not seated yet.
__________________
Jeff
“If you can make black marks on a straight from the time you turn out of a corner until the braking point of the next turn, then you have enough horsepower.”
Mark Donahue
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07-06-2002, 09:15 PM
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CC Member
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Join Date: May 2001
Location: Oak Forest, IL,
IL
Cobra Make, Engine: B&B w/FRPP 347ci 450HP Crate
Posts: 896
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Not Ranked
I am thinking that it could be that the rings have not sealed yet as you said. The engine has only been run for two short runs. Anything that I can do to assist them in sealing?
Tom
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07-06-2002, 09:21 PM
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CC Member
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Join Date: Aug 2000
Location: Chicago,
IL
Cobra Make, Engine: ERA 454 S.O.
Posts: 1,684
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Not Ranked
Do not use synthetic oil!! Did you break in the cam for 20-25 minutes at 2,500 rpm? If not, do this first. If your block was honed with deck plates, the cam break-in procedure should seat the rings by then.
__________________
Jeff
“If you can make black marks on a straight from the time you turn out of a corner until the braking point of the next turn, then you have enough horsepower.”
Mark Donahue
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07-06-2002, 10:06 PM
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CC Member
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Join Date: Nov 2001
Location: Sugar Land,
TX
Cobra Make, Engine: I had lots of little Cobras until Oscar the house thief stole all of them
Posts: 231
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Not Ranked
And then hook that PCV up. The pressure in the crankcase has to go someplace. 
__________________
I Put a Jihad on You....
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07-07-2002, 07:04 AM
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CC Member
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Join Date: May 2001
Location: Oak Forest, IL,
IL
Cobra Make, Engine: B&B w/FRPP 347ci 450HP Crate
Posts: 896
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Not Ranked
Jeff,
I am not using synthetic. What weight oil would you recommend for break in? I am using 10w30 right now.
Thanks,
Tom |
07-07-2002, 07:13 AM
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Senior Club Cobra Member
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Join Date: Dec 2001
Location: Shasta Lake,
CA
Cobra Make, Engine:
Posts: 26,597
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Not Ranked
Re somke through breathers
Tom,
I use Valvoline 20-50 racing oil in both my big block and stroker engines. That is what they used to break the stroker in on the dyno and I have used it in the big block for over 30 years with no problems. I am sure there are other oils just as good but I have just stuck with what has worked for me and the engine builder of the 351 stroker said that is what they used in their race cars. The other guys will also have a lot of good oils that they can tell you about.
Ron61
Ron |
07-07-2002, 02:23 PM
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CC Member
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Join Date: Aug 2000
Location: Chicago,
IL
Cobra Make, Engine: ERA 454 S.O.
Posts: 1,684
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Not Ranked
10w-30 or straight 30 should be fine. After break-in, you should talk to your machinest to see what type of clearances he set up. Either 10w-40 or 20w-50.
__________________
Jeff
“If you can make black marks on a straight from the time you turn out of a corner until the braking point of the next turn, then you have enough horsepower.”
Mark Donahue
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07-08-2002, 05:35 PM
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CC Member
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Join Date: Mar 2002
Location: so cal,
Cal
Cobra Make, Engine: I used to fix them for a living
Posts: 2,563
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Not Ranked
It has a hint of fuel smell? That means there is probubly gas in your oil, change it. If you have lots of air coming out the breathers than you have excessive blowby past your rings. Do a leakdown test to verify. Check your carb float levels to see why your oil smells like gas, one float could be stuck.
__________________
In a fit of 16 year old genius, I looked down through the carb while cranking it to see if fuel was flowing, and it was. Flowing straight up in a vapor cloud, around my head, on fire.
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07-08-2002, 08:52 PM
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CC Member
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Join Date: Dec 2000
Location: so calif,
Posts: 174
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Not Ranked
Oh Buoy,
Don't start fretting just yet.
A little smoke occurs when the oil splashes off the hot valve train.
Try an oil splash guard below the breathers, Speedway sells them for @ $25.
Solved my problem on this.
scratch  |
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