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-   -   Friction in cylinder walls ok? (https://www.miataturbo.net/engine-performance-56/friction-cylinder-walls-ok-91787/)

Kricket Jan 8, 2017 12:55 PM

Friction in cylinder walls ok?
 
Putting my 99 engine together. Put the crank in and rod/piston assemblies and turned the crank. It sounds a bit like rubbing, but turns okay. Ive read mixed things. Some say with a new bore/hone and new piston rings there is bound to be friction and its completely normal. Others say it should always be smooth no matter what. What do you guys think? Hopefully you can hear it in the video.

thirdgen Jan 8, 2017 02:16 PM

I would say that's fine and once it breaks in it'll go away. The friction is required for the rings to seat properly.

ryansmoneypit Jan 8, 2017 03:27 PM

the finish hone is done with about a 200 grit finish. thats not too smooth on steel. now rub another piece of metal across it. it will make noise. What you hear, is totally normal.

curly Jan 8, 2017 03:39 PM

Normal. I'd probably try to not rotate it a lot like that though. Get the engine running and then start breaking it in properly.

Stealth97 Jan 8, 2017 03:42 PM

I'm sure there is a torque spec somewhere for this... but unless you are having to put a ton of muscle in don't worry.


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