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Old 03-23-2008, 10:50 PM
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Oil blowby/oil burning

I recently installed a new 350 sbc motor in my 1983 Malibu wagon. I've put about 3,000+ miles on it yet it is still burning oil & on the highway I'm getting tremdous blowby. The engine starts & runs well. It has decent power for a daily driver. What can I do to stop this? Is it just a bad rebuild?

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Old 03-23-2008, 11:02 PM
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what exactly was done in the rebuild? was it done by a machine shop/rebuilder?

sam-missle
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Old 03-23-2008, 11:07 PM
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Thanks for you interest Sam. This engine was rebuilt by a "reputable" machine shop about 4 months ago. It was recommended to me by friends that had used it before.
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Old 03-23-2008, 11:11 PM
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"tremendous blowby" is an indication of bad ring seal. Could be from improper boring or crappy rings. Something went wrong from the beginning.

Mark
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Old 03-23-2008, 11:37 PM
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have you returned to the builder and told them of your oil burning problem? is the engine under warranty? most new engines will use a small amount of oil during the first 500 miles or more, until the rings fully break in. the blowby you describe is not normal, and needs to be addressed now. how is the engine temp when running?

sam-missle
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Old 03-23-2008, 11:38 PM
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Hi,
Do a dry then wet compression test, or a leak down.
But I do believe you've had ring sealing problems
from early on, by what you've written.
Rich
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Old 03-24-2008, 10:37 PM
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Thanks for the info Rich. I'll give that a shot before I try to get some satisfaction from the machine shop where I had the engine rebuilt.
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Old 03-24-2008, 10:43 PM
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Quote:
Originally Posted by sam-missle
have you returned to the builder and told them of your oil burning problem? is the engine under warranty? most new engines will use a small amount of oil during the first 500 miles or more, until the rings fully break in. the blowby you describe is not normal, and needs to be addressed now. how is the engine temp when running?

sam-missle
Thanks Sam. From the start I kinda thought there was some sort of problem with the rebulid. Hopefully, the builder will make good on his work.
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