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

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Offline chainsman1

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272 cylinder on a 254?
« on: February 24, 2014, 06:58:05 am »
I ve seen a 357 with a 272 top end, anyone have even seen a 254 with a 272 top end?  Maybe it would be too much work to make it fit....

The biggest it could go could be with a 262 top end?

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Offline KilliansRedLeo

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Re: 272 cylinder on a 254?
« Reply #1 on: February 24, 2014, 08:31:11 am »
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 do so would be more than just buying a 272 and rebuilding that.
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Offline SawTroll

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Re: 272 cylinder on a 254?
« Reply #2 on: February 24, 2014, 09:09:23 am »
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.  ;)

Offline KilliansRedLeo

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Re: 272 cylinder on a 254?
« Reply #3 on: February 24, 2014, 09:24:31 am »
Well I stand corrected on Stroke vs. Connecting Rod. However I do not think either of the two options are worthwhile. Although trying to get a 262 top end to work would be an interesting puzzle. Expensive but interesting.
"When the people fear the government...you have tyranny....When the government fears the people....you have liberty"

Thomas Jefferson
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Offline Gregg MacPherson

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Re: 272 cylinder on a 254?
« Reply #4 on: February 24, 2014, 02:13:20 pm »
@KRL....."..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..."

I've just pulled the cylinder off the 254 I bought and it has a spigot flanged base, the cylinder extends about 6mm into the crank case.  Is it possible that it is not a 254 cylinder?  The only numbers I can find on it are 45 ZN7 W2,  cast onto the edge of the mounting flange (with MSHLE cast on the opposite side).  This saw may be a mongrel. It has the wrong clutch cover. I'll make a separate post about that.

Cheers,
Gregg


Offline KilliansRedLeo

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Re: 272 cylinder on a 254?
« Reply #5 on: February 24, 2014, 02:23:14 pm »
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!
"When the people fear the government...you have tyranny....When the government fears the people....you have liberty"

Thomas Jefferson
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Offline KilliansRedLeo

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Re: 272 cylinder on a 254?
« Reply #6 on: February 24, 2014, 03:03:06 pm »
At the risk of being wrong three times in this thread; the 254 and the 272 both have a stroke of 34mm. That being said, we have to take into account what Troll said about same stroke but different length connecting rod. I have not been able to find the difference in length of the 254XP and 272XP connecting rods.

However, here is my supposition the differing length rods will most likely throw the port timing of the saw off.
"When the people fear the government...you have tyranny....When the government fears the people....you have liberty"

Thomas Jefferson
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Offline chainsman1

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Re: 272 cylinder on a 254?
« Reply #7 on: February 24, 2014, 03:04:00 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?

Offline chainsman1

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Re: 272 cylinder on a 254?
« Reply #8 on: February 24, 2014, 03:09:51 pm »
i got 76mm between cylinder bolt holes across the jug (center to center)on a 272 cylinder. anybody knows the mesurements of a 254 cylinder?


the spiget is 56mm in diameter

Offline KilliansRedLeo

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Re: 272 cylinder on a 254?
« Reply #9 on: February 24, 2014, 03:14:57 pm »
The 254XP piston is 45mmd,x20mmch,x39mmoa
The 272XP piston is 52mmd,x24mmch,x40.5mmoa

Both use a 12mm pin but of differing lengths.
"When the people fear the government...you have tyranny....When the government fears the people....you have liberty"

Thomas Jefferson
1743-1826

 

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