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Re: Pistons in - how much drag is acceptable?

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David G

08-25-2013 14:16:39

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There should be resistance, but none excessive. Make sure you cleaned the ring grooves good.

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08-25-2013 18:52:23

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 Re: Pistons in - how much drag is acceptable? in reply to David G, 08-25-2013 14:16:39  
I did clean the grooves well. I pulled things apart and used plastigage. The mains and rod checked out to be in spec. It looks like the #1 piston is ever so slightly cocked toward the front of the motor. I did not check the exact measurements, but there is just a bit more room to the rear side of the piston than the front side.

I can turn the crank with not a lot of problem using a 24" piece of square tubing. I just notice that at certain times I hear more of a scraping than at other times. I am not gouging the cylinder and everything else looks ok.

Maybe I am being overly cautious.

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08-25-2013 16:17:13

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 Re: Pistons in - how much drag is acceptable? in reply to David G, 08-25-2013 14:16:39  
Yep, did you clean the carbon out of the ring grooves? A buddy of mine put new rings in his 289 Mustang back in about 1970 and when he got all of the pistons in he could barely turn the crank. Turned out that he had not cleaned the grooves.

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