OzVMX Forum

Clubroom => Tech Talk => Topic started by: NSR on May 03, 2010, 09:02:14 pm

Title: Whats the cause of this?
Post by: NSR on May 03, 2010, 09:02:14 pm

I took the head off the Suwm today and found a film of unburnt oil covering the squish area. 
Any thoughts, does it matter?  I haven't have the head off for over a year so done a bit of work.
(http://i712.photobucket.com/albums/ww125/NoelSR/076.jpg?t=1272883572) 

(http://i712.photobucket.com/albums/ww125/NoelSR/078.jpg?t=1272884421)
   

Title: Re: Whats the cause of this?
Post by: matcho mick on May 03, 2010, 10:35:51 pm

replace the inlet stem seal ;D
err,maybe the last mix transferred with ignition killed,fuels evaporated over time leaving oil residue,but dosen't explain dry piston top ???

Title: Re: Whats the cause of this?
Post by: Lozza on May 03, 2010, 11:04:01 pm

It's called a piston wash pattern. Stick to fibreglass Mick ;D ;D

Title: Re: Whats the cause of this?
Post by: Ji Gantor on May 04, 2010, 12:17:33 pm

What Lozza said, that is the pistons wash pattern.
What does the underside of the piston look like.

Ji