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Old 06/02/2013, 06:01 PM   #1
91MR2
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Default Engine rebuild help / machine shop recommendation

I bought a MR2 turbo a couple of months ago and need to rebuild the engine. Looks like a piston ring is bad on one of the cylinders. I haven't decided how much of the work I want to do myself, anyone have any recommendations for a place that could do the work? I'll need a machine shop no matter what though, any thoughts on a good one? Any other tips/advice would be appreciated especially anyone familiar with 2nd gen MR2.

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Old 06/06/2013, 02:29 AM   #2
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Default Re: Engine rebuild help / machine shop recommendation

Id start by piston soaking with mmo. See if that frees up the rings first.

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Old 06/06/2013, 06:26 AM   #3
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Default Re: Engine rebuild help / machine shop recommendation

I'll give the piston soak a shot, thanks.

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Old 06/06/2013, 01:24 PM   #4
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Default Re: Engine rebuild help / machine shop recommendation

Do you need step by step for piston soaking?

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Old 06/07/2013, 06:44 AM   #5
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Default Re: Engine rebuild help / machine shop recommendation

I found some instructions online, but a lot of different opinions on best way to do it. Let me know if you have any advice/instructions. I have low compression in one cylinder and I read different opinions on if the piston soak would help or not. I figure it can't hurt though. I'm planning on doing a before/after compression test to see if it improves after the soak.

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Old 06/07/2013, 08:57 AM   #6
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Default Re: Engine rebuild help / machine shop recommendation

You should use marvel mystery oil. A couple oz in each cylinder. Its only around 5 bucks a bottle at walmart. I did it on my toyota and it helped with the rings.

Let it sit with the spark plugs out and a towel to cover for a couple days. Crank motor to blow out any extra mmo in cylinders. Then put everything together and fire it up. It may not run as good right away. But just let it sit there at idle for a bit so it can burn the extra mmo out. When it stops smoking, take it for a test run around the block a few times. Then check compression

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Old 06/08/2013, 11:04 AM   #7
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Default Re: Engine rebuild help / machine shop recommendation

I can get it done for you as long as there's not a whole in the block. lol

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Old 06/09/2013, 01:18 PM   #8
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Default Re: Engine rebuild help / machine shop recommendation

Quote:
Originally Posted by Charlie Moua View Post
I can get it done for you as long as there's not a whole in the block. lol

pm me
I'll send you a PM to follow up.

I tested compression a couple months ago, and decided to do another before/after the piston soak. Results:

1st (2 months ago): 156, 90, 155, 155 (average of 3 tests)
2nd (right before piston soak): 154, 156, 154, 152
3rd (after piston soak): 155, 154, 158, 158

Not sure what is up with the test results for cyl #2, it seems ok right now. When the smoke was burning off from the soak, I saw a little smoke coming out of the exhaust manifold/turbo area. Not sure what that means yet. Even if compression is looking ok, there's more work that needs to be done. I'll keep looking into it.

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