Re: 360 engine smoke
[Re: 451Mopar]
#775291
08/17/10 05:59 PM
08/17/10 05:59 PM
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Joined: Jan 2005
Posts: 4,418 Michigan
MarkZ
Worthy
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Worthy
Joined: Jan 2005
Posts: 4,418
Michigan
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If all eight of the plugs look exactly the same, I'd be leaning away from the issue being with the intake manifold gasket and valve seals.
First and foremost, as mentioned, perform a leak down and compression test.
What I would be thinking about now is did the machine shop set the gap correctly for the top piston ring. Are those pistons hypereutectic? If so, they require a different gap than cast and forged pistons.
1987 Fifth Avenue - 512/518/D60
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Re: 360 engine smoke
[Re: RapidRobert]
#775302
08/21/11 11:13 AM
08/21/11 11:13 AM
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Joined: Jan 2010
Posts: 509 Middle River, MD
Mapandjlp
mopar
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mopar
Joined: Jan 2010
Posts: 509
Middle River, MD
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Thanks. Good read. But there's a lot of contradictory info here. What about cam break in? What about tuning? These things have to be considered before just firing up a new motor and beating it around the block to break in the rings.
Either way, when I fired this up for the first time, I broke in the cam per Comps instructions. Then, I have to admit, the first several trips around the neighborhood were quite "spirited".
The one thing that does stand out to me though, is the honing job. Perhaps my machinist had it too rough...
Will a compression test tell me if it is indeed the ring seal? What should I expect to get for compression?
Oh, and I've checked all the plugs. They all look pretty clean. No carbon or oil build up at all...
Thanks again for the help!
Last edited by Y4 Challenger; 08/21/11 11:25 AM.
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Re: 360 engine smoke
[Re: Mapandjlp]
#775305
02/23/12 12:48 AM
02/23/12 12:48 AM
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Joined: Sep 2003
Posts: 1,688 Marlboro, NY, USA
Rick_Ehrenberg
top fuel
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top fuel
Joined: Sep 2003
Posts: 1,688
Marlboro, NY, USA
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Quote:
Bumping this back up for discussion as it's time to tackle this issue before cruising season. Anyone have any feedback on my previous post regarding what to expect from a leakdown/compression test?
"My rules" for leakdown:
3% - typical rebuilt engine w/ rings seated 2% - excellent OEM 1% - Really good (Barton, etc.) Anything between 3 and 10% - runs OK, giving up some power Over 10% - break out the wrenches. Crop duster.
Rick
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