New Motor Smoking?
11-05-2006, 01:14 PM
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New Motor Smoking? 408 spun two rod bearings. A very good tech. went through the motor replacing bearings, rings, heads reworked, cylinder walls de-glazed, crank turned, and anything else that should have been done. He put reg. 5w-30 oil in for break in. We cranked the car and no smoke, it ran good. He drove it for about 20 miles, then changed the oil to 5w-30 full synthetic. He did say he put a full 7 quarts in instead of 6.5. I went to get the car today, cranked it up and let idol for a while. The car starts to smoke, and continues to smoke. At one point after revving the motor there was a rather large puff of smoke. I decided to leave the car there, and let the tech. assess this situation. I stopped in periodically during the engine build and know everything was top notch. This is a little mystery. Maybe it will be something simple. What do you guys think?
11-05-2006, 05:43 PM
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^^ above. Are you doing a soft or hard break in? I wouldnt change the il to synthetic until atleast 100 miles. Alot of people say atleast 500 if you are doing a soft break in. I'd drain it back out and put regular nondetergent oil back in.
11-06-2006, 02:29 PM
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The only thing that needs to seat would be the springs. Sounds like they didnt have time to seat/seal and need more run time. I would double flush the synthetic out of there and run it on the lightest oil there is for about 1k mile and see whats up.
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11-06-2006, 10:02 PM
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Trying to work and fast finger typing, I ment "rings". But, now that you mention it, springs need a little somethin somethin too in the breakin period, but, it has nothing to do with synthetic oils.
11-06-2006, 10:22 PM
#10
Originally Posted by csmc711
Trying to work and fast finger typing, I ment "rings". But, now that you mention it, springs need a little somethin somethin too in the breakin period, but, it has nothing to do with synthetic oils.
