oi KFZ or anyone piston 2 bore clearance

Fred Killa

19/08/2003 at 17:54

could anyone tell me what the piston/bore clearance should be on c90ish engine. just had a b/bore done and can't get piston and rings into hole.

piston 50.94
bore 51.16
clearance 0.11 or 0.005"

bit tight innit

cheers

KFZ

19/08/2003 at 20:37

Oi yourself!!!

When you say its 0.11 where are measuring?

Tell me what yourve done to the engine, tell me some background if your gonna oi me.

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kickstart68

19/08/2003 at 20:57

Hi

Not got a C90 manual handy, but have an early CBR600 one floating round. That quotes the clearance at 0.01mm~0.05mm, or about half what you are quoting at least. However a liquid cooled engine will run tighter clearances than an air cooled C90, but you should still be able to get the piston in place.

However pistons are not round. As the metal in different places varies in thickness, and the more metal there is the more it will expand with head the clearance will vary depending on where you measure it. On the CBR the clearance is measure on the piston skirt, 10mm from the bottom and at 90 degrees to the gudgeon pin bore.

All the best

Keith

Traxpics, on track pictures.

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