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smoking.....?
ok bros a friend of mine who lives too damn far away for me to travel and look at his vehicle has a problem.heres the low down.his small block chevy race engine ,high compression,roller ,etc is smoking like out of the blue,he had it re rung last fall/no major high rpm passes....crate world motor about 2 years old ...he said his idleing has jumped up to 1500 and it usually goes about 1100..i cant understand the smoke deal though/although he did run some pump fuel in it at low rpms cuz blue/purple fuel not available..could he have pulled rings out of it or is this something from unleaded fuel.?will this smoke pass..i never ran shit fuel in a high comp motor so im not sure.thanx.
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Has the timing been screwed with? (ie advanced?) Maybe the combo of that and the low grade fuel has caused detonation to burn a small hole in one of the pistions? Hard to say without being there and actually looking at it.
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i agree.what sure fire way can i tell him to check for detonation/as in a quick answer?
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one more thing he has like a 600 plus solid lifter roller with 14 to 1 s or sumn what should he be idling at?rpm that is.......i forget duration wait its a 637 lift with 276 duration.
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Well, I would have him run a compression check first, see what the numbers are and go from there. It seems odd that the idle RPMs picked up all by themselves. That is why I asked if the timing had been screwed with.
Is it really blowing blue smoke, or is it just running richer than normal? ie. black smoke
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he seems to think its blue........they just changed the cam a while back....think it jumped timing.?....could this happen with the fuel and could the lead/unlead cause some type of mixture confusion in the engine.....although i think you could be right,might be black smoke as in dark
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Could be a cracked intake/head. Sucks in the air from outside idling high, like a vacum leak, oil gets by the valves. Do a compression test, then a vacuum test it that doesnt show anything.
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would that increase timing?1100 to 1500........how hot can his go?