bbc motor smoking

Old 09-15-2009, 06:14 PM
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ssmonte70
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Default bbc motor smoking

hi, i had a local machine shop build a 540 chevy motor pump gas with merlin aluminum heads, i started the motor and it smokes, did a leak down and leaks down ok, changed the intake gasket and still smokes , any suggestion, thanks
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Old 09-15-2009, 06:26 PM
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BEAST477
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Did you run it long enough to seat the rings?
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Old 09-15-2009, 06:30 PM
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DirkaDirka
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What color is the smoke?
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Old 09-15-2009, 06:43 PM
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ssmonte70
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Default bbc motor smoking

yes i did run the motor i dont like to drive it because it smokes , and white smoke,
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Old 09-15-2009, 07:14 PM
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If I recall right white smoke means it is burning oil.

IMO I would try a compression check to make sure all the cylinders have around the same compression. Doing this would check to see if the rings are sealing correctly and to make sure the head gasket is not leaking it in the cylinder. Like I said that is something I would check.
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Old 09-15-2009, 07:20 PM
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ss68nova
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Default bbc motor smoking

i will try thanks
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Old 09-15-2009, 07:20 PM
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FullTimeRacing
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what do you mean it leaks ok, what's the #'s

you may just need to run it some more

are you losing water,is the upper hose getting hard real fast,water in the oil,fuel in the oil?
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Old 09-15-2009, 08:14 PM
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chevynovaman
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MY GUESS IS THAT WHITE SMOKE MEANS IS BURNING ANTIFREEZE,, BLUE SMOKE IS OIL....THE BIG BLOCK CHEVYS HAVE THE GEN 4 5 6 AND SOME OF THESE DONT INTERCHANGE... GOOD LUCK...
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Old 09-15-2009, 08:18 PM
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Yeah, white smoke is anti-freeze or trans-fluid, not oil.

Blue is oil.

If they used trans fluid to clean the cylinder walls (that's what I use), there could be some left over in it.

If you have a transmission with a failed vacuum modulator and it's plumbed into the intake, that can cause it.

Or, could be a head gasket.

Drain the coolant out and fire it up without the water pump belt on it. You can run it for 5 mins or so (from being room temperature) without worry of over heating. See if it still smokes.

The other thing you can do with it running is to pull off the radiator cap (NOT WHEN IT'S HOT!) and see if it's blowing bubbles in the coolant.

If it blows bubbles, or doesn't smoke without coolant in it, definitely a head gasket.
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Old 09-15-2009, 08:20 PM
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DirkaDirka
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Thanks for correcting me on the color of smoke. I alwasy get confused on what color is what.
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