stihlbro
ArboristSite Operative
It is on a 50 special with a windowed piston.
hard time finding the right piston husky55
- Thread starter samhop
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Big_Wood
westcoast dweller
so which one was the stock saw and the one you did? curious minds need to know 
. i hope the first one was the one with the 51 piston.
. i hope the first one was the one with the 51 piston.
first one held rpm, cut faster, sounded a good 4erd out of the cut and cleared up nice in the wood.
now idea which one is stock cp cly. w/windowed piston. -- or moded cyl (opined from lower port to base) w/ 51piton.
hope its the first one
now idea which one is stock cp cly. w/windowed piston. -- or moded cyl (opined from lower port to base) w/ 51piton.
hope its the first one
watsonr
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which saw is the one you did... #2
Where in VA are you?
Where in VA are you?
stihlbro
ArboristSite Operative
wigglesworth
Booned
this thread makes me chuckle...
stihlbro
ArboristSite Operative
this thread makes me chuckle...
Oh please share!
wigglesworth
Booned
stihlbro
ArboristSite Operative
You are correct! With saying that, the original saw, the exhaust port is carboned up. I would like to pull it down and clean it up. Check the ring land as well. Then, test again.
Big_Wood
westcoast dweller
that is sure a performance increase. the stock one actually looks and sounds kinda turdly after hearing the first one.
stihlbro
ArboristSite Operative
I just cleaned/decarboned the exhaust port. Opened the lower transfer area. New piston. Never checked squish or timing. I did check piston heights and skirt length against each piston.
Mastermind
Work Saw Specialist
The increase in case compression from the full skirted piston was a welcome thing it seems.
Ok thanks. i might widen out the the intake/ex some jest to see what happens. it was a freebee and i have 3 other about that size.
thanks for info
Wouldn't the case compression have gone down, due to the removal of all that material in the cylinder? I'm thinking is just improved flow.
Mastermind
Work Saw Specialist
I don't think so Brad, and here's why. The fully skirted piston would act like a cup that was full. Like when you turn a jar upside down and hold it under water......no water enters the jar. This same action would be at work in the bore, pushing downward on the mix, and in turn more pressure would be built in the transfers.
