Mastermind
Work Saw Specialist
Thanks for that pic Rogue60........Now I can say I've see detonation damage in a chainsaw.
when you did the saw ,did you advance the timing on the flywheel at all ?BTW, That saw has been run on 32:1 H1R for a long time with shell 92 ethanol blend. I have no idea what caused it. When I went to put the piston stop in it to change the drive rim, I shined a light through the plug hole for the first time since I ported it, I was like WTF!?!?!? It looked worse through the plug hole, so I pulled the top for a closer look. Took some pictures and put it back together. The combustion chamber is spotless, just the exhaust side of the piston crown is pitted some.
Gonna change gas stations and see what happens.....
when you did the saw ,did you advance the timing on the flywheel at all ?
I like me some mail ladies.......
I blowed the middle pic up......it looks like something was eating at it. But then, what will detonation do to one?
It's another case of, the more I see, the less I really know.
I'm a ditto on MM's opinion of that Komatsuvarna's slug
looking like impact damage.
Seems like there are some scuffs or transfer spots on the skirt
that roughly correspond with the heavier deformations of the
crown edges.
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I was looking for some info regarding detonation and combustion chamber, etc and found this:
http://www.contactmagazine.com/Issue54/EngineBasics.html
Some pretty interesting reading in it.
the ign timing and exhaust temps was 'specialy interesting!
Gots me wanting to set up a test block for my leafblowers
just wish I didn't have neighbors so darn closeup now
can't run the noisy two cycles at night anymore
and that's my most mentally productive time.
(was born at 9:45 pm, dangit )
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