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#Post#: 34804--------------------------------------------------
QA on Aftermarket Cylinders
By: KilliansRedLeo Date: February 20, 2014, 9:28 am
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A buddy of mine and I have built several of the same formula
saws. Husqvarna 372 bottom end, Hyway BB 52mm C/P and a Meteor
or Stihl 064 piston. We have both noticed that there is a wide
variance in what if any base gasket will result in near optimum
squish of 0.020.
I just finished one for myself and had to use 0.030 base gasket
to get 0.020 squish, where Alan was able to run no base gasket
and ended up with a squish of 0.025. The Meteor version of the
Stihl 064 piston has a Compression/Pin Center to top of Piston
23mm and Compression/Pin Top to top of Piston 17mm. The standard
372 piston measures Compression/Pin Center to top of Piston
22.5mm and Compression/Pin Top to top of Piston 16.5mm. Hyway
does not publish these specs on their BB kit pistons.
However in comparison the BB kits from Baileys show
Compression/Pin Center to top of Piston 22.75mm and
Compression/Pin to top of Piston 16.75mm. So this shows that not
all AM suppliers go by the same specs or even close.
I have been assuming that Hyway would have copied the stock
piston measurements and only increased the bore. So if that is
true then we cannot figure out why these things vary so widely.
If I were to venture a guess it would be that the cylinders vary
in height from deck to squish band outer edge.
Has anyone else seen this or have any thoughts?
#Post#: 34810--------------------------------------------------
Re: QA on Aftermarket Cylinders
By: aclarke Date: February 20, 2014, 10:04 am
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Is there an actual machine cut squish band on the hyway jug? A
lot of the Asian AM jugs I've worked on weren't cut and the
chrome is applied irregularly in that area
#Post#: 34811--------------------------------------------------
Re: QA on Aftermarket Cylinders
By: KilliansRedLeo Date: February 20, 2014, 10:09 am
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IDK, I have some on the way, I will check and post some pics!
#Post#: 34814--------------------------------------------------
Re: QA on Aftermarket Cylinders
By: KilliansRedLeo Date: February 20, 2014, 10:25 am
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3000FPS also hinted that there may be a deck height difference
between a 365SP and a 371/72XP which would also create an issue.
I think we will have to wait for SawTroll to chime in before we
may know the answer to that. As I do not know how the factory
gets this measurement nor do I know the tolerance limits and
perhaps Nikko does!
#Post#: 81531--------------------------------------------------
Re: QA on Aftermarket Cylinders
By: Chainsawrepair Date: February 21, 2018, 10:37 am
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Saving ole info
March 2011 info shared by Gregg that was having them brought
into Baileys back in the day.
Meteor cylinders are being cast in Taiwan. Machined and Plated
by Gilardoni in Italy, and stuffed with a Meteor piston.
Regards
Gregg
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