Yesterday's Project: Husky 55 Air Injection Rebuild/Porting

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mainewoods

mainewoods

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Which raises a lot of questions - such as what makes them crack? The heat generated from the cutting causing the metal to become fatigued, or the port job causing added strain on the piston, for example ?
 
Walt41

Walt41

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I'm glad you said it Randy, the idea of cutting holes in anything that wasn't cast or forged to have a hole there has never sat right with me, throw in multiple heat cycles and it should just be a matter of time.
 
blsnelling
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Here's the piston in my 55.

IMG_1740-M.jpg


IMG_1739-M.jpg
 
PogoInTheWoods

PogoInTheWoods

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I went back in to open up the lower transfer ducts to the case. This idea came from Stihlbro. With this modification, windows would not be needed in the piston.......

Doesn't that just makes it an open port top end again and defeat the purpose of the whole exercise?

edit: Nevermind. I just read the other recent 55 thread with everyone's input on the subject and I guess the answer is crystal clear....sorta.:laugh:

http://www.arboristsite.com/community/threads/hard-time-finding-the-right-piston-husky55.249742/
 
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RedneckChainsawRepair
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Brad to show folks they dont know what they are talking about on making a closed port into a open port going backwards. :dizzy:
My race MVP 166 bridge was removed to make it open port and my MVP copied cylinder on my partner 5000 you ran against and maybe ran had bridge removed to make it open port too. ;):laugh: They ran pretty dang good didnt they. o_O
 
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