Author Topic: 272 cylinder on a 254?  (Read 329 times)

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Offline Gregg MacPherson

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Re: 272 cylinder on a 254?
« Reply #10 on: February 24, 2014, 03:16:39 pm »
@KRL....."....Wow, it appears that I have been wrong twice in this thread. After looking about the internet it appears that the 154 and 254 indeed use the same cylinder and they both DO have a spigot! See the attached. I appologize for leading you astray!....
I guess I should turn in my Husqvarna badge!...."

I'm sure you're just kidding.  Trying to keep an old saw going,  this forum was like an oasis in the desert.  So thanks to all the people who contribute here.

Offline KilliansRedLeo

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Re: 272 cylinder on a 254?
« Reply #11 on: February 24, 2014, 03:28:25 pm »
It just occurred to me that you may also have a problem with the 272 piston at 40,5mm oah having the skirt hitting the crank throws at BDC. When I mess with these kinds of frankensaws I try to have 2mm clearance between the skirt and the crank.
"When the people fear the government...you have tyranny....When the government fears the people....you have liberty"

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Offline SawTroll

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Re: 272 cylinder on a 254?
« Reply #12 on: February 24, 2014, 07:26:52 pm »
IIRC, the 254 has a shorter stroke that the rest of the members of that family. (I remember SawTroll reminding me of that a short while back) So that lets the rest of the family out. The 272 cylinder also has a spigot or flanged base that fits down into the crankcase, the 254 and the rest of the family use flat based cylinders.

So, unfortunately I think you re out of luck. If and only if you could put the 272 top end on a 254 the cost to doso would be more than just buying a 272 and rebuilding that.

Actually the stroke is the same, but the con rod is shorter than on the 262 and 257.  ;)


if the con rod is shorter,maybe the piston pin to crown height is taller?

Or the cylinder is sitting lower relative to the crank?

I don't know the details.

Offline KilliansRedLeo

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Re: 272 cylinder on a 254?
« Reply #13 on: February 25, 2014, 07:27:54 am »
Quote
Or the cylinder is sitting lower relative to the crank?

I don't know the details.

Yes, I agree that is also a possibility. We would need to know the deck height from crank shaft center, as well as the actual length of the rod from crank pin center to piston pin center (I think? ???). In order to try to figure it out. None of these measurements can I find anywhere, I can't even find anything from HVA stating the deck height.
"When the people fear the government...you have tyranny....When the government fears the people....you have liberty"

Thomas Jefferson
1743-1826

Offline jacob j.

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Re: 272 cylinder on a 254?
« Reply #14 on: February 25, 2014, 12:38:59 pm »
Both cylinders are flanged, but the flange for the 272 cylinder will not fit into the 254 crankcase; the opening is just too small.

It could be done, with a lot of time and machine work. I doubt it would be worthwhile to anyone but an absolute fanatic.

 

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