Saw builds

[jmssaws]

On a saw with a large bore, I think too much compression starts fighting back.

Absolutely.

 

[jmssaws]

View attachment 25425 View attachment 25426




Hybrid

Here's the one I did deeter

 

[Redfin]

1122?

 

[jmssaws]

1122?

660
I was attempting to reduce case capacity and make a 660 run like a old 066 butit didn't help,the cylinder was timed so bad I just couldn't make it very strong.

 

[Stump Shot]

I have an old saw in my bone pile that was saw-dusted and has no measurable compression to it all. It will start and run but at a high rate of speed/rpm, it will not idle down. So at the other end of the spectrum I would think it would be reasonable that a limit of compression could be reached where it would be detrimental to go any higher. Think about the piston mass, having to overcome that amount of pressure, vs the power increase made, one having to take over the other. Of everything (not much) I know about engines, there's always a trade off. Very interesting though, has the pea in my head just a swirling! I can't help but wonder if a little more weight on the flywheel rotating mass or maybe even the piston itself would help overcome this or would it just hurt acceleration to the point of not being purposeful?

Edit:

Hard to put away all I learned back in my hot rodding days. These little two strokes are a whole different critter than a big block V8. Guess that's whats makes saws so interesting to me, always something new coming along, but interesting all the same.

 

[junkman]

I have an old saw in my bone pile that was saw-dusted and has no measurable compression to it all. It will start and run but at a high rate of speed/rpm, it will not idle down. So at the other end of the spectrum I would think it would be reasonable that a limit of compression could be reached where it would be detrimental to go any higher. Think about the piston mass, having to overcome that amount of pressure, vs the power increase made, one having to take over the other. Of everything (not much) I know about engines, there's always a trade off. Very interesting though, has the pea in my head just a swirling! I can't help but wonder if a little more weight on the flywheel rotating mass or maybe even the piston itself would help overcome this or would it just hurt acceleration to the point of not being purposeful?

Edit:

Hard to put away all I learned back in my hot rodding days. These little two strokes are a whole different critter than a big block V8. Guess that's whats makes saws so interesting to me, always something new coming along, but interesting all the same.

Heavier flywheels do help in a work saw in my opinion ,especially running a longer bar .

 

[huskihl]

Looks a bit like a 394

 

[huskihl]

Here's the one I did deeter
View attachment 25455

 

[jmssaws]

Anybody ever port one of these?

 

[jmssaws]

Looks a bit like a 394

That's why my 394's always beat my 395's
I'm getting better on quads but still favor duals.

 

[Redfin]

Anybody ever port one of these?
View attachment 25467

Crap I was gonna ask you the same.

 

[jmssaws]

Crap I was gonna ask you the same.View attachment 25468

I ported mine.

 

[jmssaws]

There ain't much you can do in the cylinder or muffler to gain power,I cut the base enough for a 020 squish and worked on the exhaust port some and raised it but can't remember where it's at.
Ignition advance helps big time

 

[Canadian farm boy]

Crap I was gonna ask you the same.View attachment 25468

Nice saw John.

 

[jmssaws]

I got a 4200 I need to get going again,been a long time since it ran

 

[Definitive Dave]

@guidosalvage has a real soft spot for the larger Poulans he has at least three of them I think

 

[exSW]

@guidosalvage has a real soft spot for the larger Poulans he has at least three of them I think

He's got at least three of everything.

 

[jmssaws]

Here the old girl is,ain't been ran in a long time but she fired right up.

 

[jmssaws]

I been tuning on this little mean basterd

 

[hseII]

I been tuning on this little mean basterd

I bet your neighbors hate you.