Is this ok? PR engine

Old 01-25-2012, 01:48 AM
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Well my PR engine has about 1.6(looking at bottle)gallons through it mybe a little less.

but anyway when i took head off to get to the engine mount bolts i thought i would see what pinch it had left... so anyway i took button off and turned engine over a few times it felt good but didnt lift the sleeve like alot of others motors. is this normal or is it worn out?

inside is a tan colour and had a tad bit of carbon build up on the button but hardly anything.

would just like to add that when i dis-assembled it and tryed to push piston through sleeve, was dam tight at normal point in sleeve(only hand pushing though)

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Old 01-25-2012, 02:14 AM
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It can be normal, if the engine is running fine there is nothing to worry about. The status in cold condition does not tell anything about the fit on working temperature.
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Old 01-25-2012, 02:19 AM
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sweet, but anyway i took apart to check orings and seals put back together with light oil it pushed it up out of the case fine... weird little things...
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Old 01-25-2012, 02:47 AM
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All that means is the sleeve had seized to the case a tiny bit - hardly surprising due to what we do to them with heat and stuff.

Like a screw that you can't get undone, but one tap with a hammer and it comes out easy. If you reinstall that screw it will undo easily. But a year later, yes you need the hammer again.
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Old 01-25-2012, 08:00 PM
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That normal for precirotates. are really tight when you get them
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Old 01-25-2012, 09:23 PM
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I'm surprised how many folks misunderstand "pinch". If pinch still exists then engine isn't broke-in. So many refer to compression as pinch. A racing engine doesn't perform well until mechanical pinch is gone. Then it's all compression. If ur piston is still getting stuck in the sleeve close to tdc it's not quite broke-in.
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Old 01-25-2012, 10:05 PM
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Yup that's why break in is so important your sealing the piston and sleeve together that's compression. As Ham stated pinch is metal to metal as you break in and run you want this to go away its call dropping its nuts then your at 100% performance.
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Old 01-25-2012, 10:44 PM
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Originally Posted by hambone View Post
I'm surprised how many folks misunderstand "pinch". If pinch still exists then engine isn't broke-in. So many refer to compression as pinch. A racing engine doesn't perform well until mechanical pinch is gone. Then it's all compression. If ur piston is still getting stuck in the sleeve close to tdc it's not quite broke-in.
Some engine still have pinch after several gallons of fuel WHEN THEY ARE COLD!
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Old 01-26-2012, 07:58 AM
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I agree. Some of that may be castor varnish making it stick also.
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