924Board.org

[Fasteddie313]

I have seen some stuff about knurling piston skirts to increase their OD in order to bring the piston-bore clearance tolerances back into check...

Like this...



from http://www.pbase.com/stealthfti/image/53355694

But anyway I was curious if this method would work on other clearance sensitive parts that experience wear on there OD surfaces..

Say maybe g31 synchro rings?
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80 Turbo - Slightly Modified

[ideola]

I don't believe the issue with synchro rings to be one of clearances, but rather of finish.

Interesting thought, though.
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erstwhile owner of just about every 924 variant ever made

[Fasteddie313]

"Our new Carbon Moly Synchros have a new and improved proprietary composition that promotes Quick & Smooth shifting in addition to a more dependable braking surface. With a stronger brass body and improved locking angle, our Carbon Moly Synchros will take your tachometer to the limit."

http://gearspeedpartsstore.com/products.html

I wonder if this coating could be applied to our existing worn rings to add a few thou of OD and give a nice friction surface

Maybe I'll call them...
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80 Turbo - Slightly Modified

[Fasteddie313]

Called them, they said it sounded possible but the way they manufacture them it may not be plausible to run a one off set...

And to call back tomorrow after he finds out more for me..

Seems brass syncros with this coating are very popular with honda car people revving to 11k rpm and such..
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80 Turbo - Slightly Modified

[jason c]

[Fasteddie313]

Knurl em both, that should "synchronize" their speeds quite well..

Ha ha, no..

I did find G31 2nd syncros from $42 used 928 ones to $70 new 931 ones tho..
No new 928 ones..
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80 Turbo - Slightly Modified