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post #1 of (permalink) Old 07-27-2001, 12:12 PM Thread Starter
 
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Rebuilt engine break in oil viscosity suggestions?

I am about to drop in a newly rebuilt engine that I have been working on and was wondering what type or weight of oil I should use in it. It is .020 over, with flat top pistons, and reground cam. Any suggestions??

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post #2 of (permalink) Old 07-27-2001, 12:20 PM
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Re: Rebuilt engine break in oil viscosity suggesti

you can use just about any oil to break it in, I use 15/30 in my bike engine the last time i rebuilt it.
WHATEVER YOU DO, DON'T USE SYNTHETIC UNTILL IT IS BROKEN IN..

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post #3 of (permalink) Old 07-27-2001, 01:04 PM
 
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Re: Rebuilt engine break in oil viscosity suggesti

why shouldnt you use synthetic?

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post #4 of (permalink) Old 07-27-2001, 01:20 PM
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Re: Rebuilt engine break in oil viscosity suggesti

Synthetic oil does not allow the metal to contact and create wear patterns (breaking in).

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post #5 of (permalink) Old 07-27-2001, 01:38 PM
 
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Re: Rebuilt engine break in oil viscosity suggestions?

From what I know, your engine builder should be the one answering that question. It depends on the bearing tolerances and such. I would most likely use a thinner oil flows to dry parts faster.

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post #6 of (permalink) Old 07-27-2001, 01:55 PM
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Re: Rebuilt engine break in oil viscosity suggesti

Well run the oil viscosity that is right for the temp range of the season. Prelube the engine,(crank it for awile with no power to the coil No gas in carb till the oil pressure is built up some then start it. You did get the head gasket on the right way? If you don't you will wipe out the head.
When I did mine I think it was written on the gasket"This side up" or some such. And I checked all the holes to make sure they lined up.

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post #7 of (permalink) Old 07-27-2001, 02:08 PM
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Re: Rebuilt engine break in oil viscosity suggestions?

lav25 in the engine builder. I advised him to use the same weight oil that the factory manual recommends.

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post #8 of (permalink) Old 07-27-2001, 02:14 PM
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Re: Rebuilt engine break in oil viscosity suggesti

"Synthetic oil does not allow the metal to contact and create wear patterns (breaking in)."

if there is metal to metal contact your motor isn't gonna
run long,the oil is supposed to keep the metal FROM touching
each other.otherwise you are wearing the motor heavily.
synthetics are ok to use in a new or rebuilt motor,the come
in some cars from the factory for years.it's just a old wife's tale about it not being used in new or rebuilt engines.



post #9 of (permalink) Old 07-27-2001, 02:27 PM
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Re: Rebuilt engine break in oil viscosity suggesti

To state across the board that you can use syntetic oil is
a disservice to say the least. read the instrutions on the back of the oil bottle sometime. Most state not to run in a new or re-built engine. The rings will not seat in properly
depending on the ring material. It took my rebuilt engine
allmost 2K miles to seat in fully, and this was with regular
multigrade oil.

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post #10 of (permalink) Old 07-27-2001, 02:33 PM
 
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Re: Rebuilt engine break in oil viscosity suggesti

how do you know when the rings have seated?

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