a piston has smashed to tiny peices!
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cbr_veze
- Settled in member
- Posts: 80
- Joined: Thu Mar 19, 2009 8:30 pm
a piston has smashed to tiny peices!
im in the process of stripping my old nc29 engine to get the gearbox out. on initial inspection of the engine, i new there was a problem with the top end, its number 2 cylinder. the exhaust valves are bent, and if i look down the barrel the piston isnt there. its at the bottom of the sump in a million peices and i think some went out the exhaust. i did a compression test on it a few weeks prior to it breaking. i wasnt racing the bike, just on a commute back from work. the compression was 200psi on every cylinder, and i think that is very good. i was wondering what could of caused the piston on number 2 cylinder to dissintergrate. lol. 
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mrdidlydingo
- Site Supporter
- Posts: 135
- Joined: Sun Dec 14, 2008 10:41 pm
- Bike owned: NC29, 30, 35, RDLC, GSXR
Re: a piston has smashed to tiny peices!
How longs that piece of string !!!
Leaning of cylinder causing detonation
Poor lubrication to underside of piston
Exhaust valve stuck open
Foreign body in cylinder / transfer ports
Wear and tear on piston crown
Dropped valve
I'm all out for now !
With both your exhaust valves bent I would suggest the piston went first, after that your on your own.
Check everything surrounding for damage before you rebuild, smashed pistons I have only had the misfortune to come across on high boost fords and that's literally because they were not up to the job.
Leaning of cylinder causing detonation
Poor lubrication to underside of piston
Exhaust valve stuck open
Foreign body in cylinder / transfer ports
Wear and tear on piston crown
Dropped valve
I'm all out for now !
With both your exhaust valves bent I would suggest the piston went first, after that your on your own.
Check everything surrounding for damage before you rebuild, smashed pistons I have only had the misfortune to come across on high boost fords and that's literally because they were not up to the job.