I am building an 044/046 hybrid and I think I remember hearing about another member using an 064 piston in an 046 (both are 52mm) I am wondering what the advantages to this are and what it takes to make it happen. I have a line on an 064 piston that is cheaper than most aftermarket ones so thats why I am so interested.
064 piston in an 046 cylinder?
- Thread starter ironman_gq
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Trigger-Time
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If anyone know's it will be JJ
TT
TT
MS390
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Cool!!!
opcorn:opcorn:
opcorn:opcorn:
bcorradi
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Agreed
oscar4883
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I believe he has commented on this topic before. Just tried quick search but we all know how well that has been working lately. LOL
I tried the search too. I think he may have turned a popup on it but Im not sure. Im really interested in doing this.
+2
I was going to say the same thing. Gary was just plain quicker on pulling the trigger.
Nope, different stroke.
If that would work, then a 066 BB would fit on a 044.....
Well maybe if you are a machinist with lots of spare time and $$$
If that would work, then a 066 BB would fit on a 044.....
Well maybe if you are a machinist with lots of spare time and $$$
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Rounder
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Spent some time at the shop today, and the boys were working on another 440/660. 440 with a bored out 460 topend, pop-up 66 piston. Pretty slick. They've built several of these. A fair bit of work involved. Might make a fun project for ya - Sam
You might want to use an 038 magII piston.
That also has different stroke, but the same bore..........
P.S. This thread will be fun to watch.......
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I know it has a different stroke. It's the numbers that matter.
What NUMBers?
bcorradi
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Not complete, but should answer some of your questions. Stihl saw specs including strokes
Piston pin center to crown
Pin top to crown
Height of piston
Skirt length
The 064 piston would be alot more work than an 038 piston. The 064 piston skirt is much longer and would need to be trimmed in order to clear the crank bells. It is also 1.5mm taller which means you would need a 1mm tall pop-up and an extra 0.5mm base gasket.
volks-man
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probably has something to do with pin to crown height.
edit:
meadow beat me to it.
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Forestryworks has a saw I built for him (MS-440) with a BB 440 cylinder and an OEM Stihl 064 piston. It isn't that difficult. I turned a pop-up in the piston leaving .060" over the top ring locating pin which left .110" over the top ring land. I used the stock teflon-coated aluminum base gasket (0.5mm) and ended up with .024" squish. It's a good running saw that was consistently pulling around 180-185 psi on the Lisle.
Trimming the skirts isn't a big deal. A trained monkey can do it with a file. I lightened the piston quite a bit as well.
Madsaw has a BB 372 I built for him that also has an OEM 064 piston and rings. There I did not cut a pop-up in it but rather made a 1.5mm thick base gasket which left the squish at .022". That also made a good running saw. An 038 Magnum piston also makes a decent runner in a BB 372 cylinder, albeit with some work to the piston. A Husky 380 piston can also make a decent running BB 372 but it takes a lot more work.
Trimming the skirts isn't a big deal. A trained monkey can do it with a file. I lightened the piston quite a bit as well.
Madsaw has a BB 372 I built for him that also has an OEM 064 piston and rings. There I did not cut a pop-up in it but rather made a 1.5mm thick base gasket which left the squish at .022". That also made a good running saw. An 038 Magnum piston also makes a decent runner in a BB 372 cylinder, albeit with some work to the piston. A Husky 380 piston can also make a decent running BB 372 but it takes a lot more work.
