Saw video thread

[Chainsaw Jim]

I've done a little more work on the carb. Still more to go to get the idle down good and proper.
I'd still say s it's making good progress, here it is running a 10-pin 3/8 set up.

 

[Frank bierce]

I've done a little more work on the carb. Still more to go to get the idle down good and proper.
I'd still say s it's making good progress, here it is running a 10-pin 3/8 set up.

Dang Jim....that’s lookin good. Didn’t sound like rpms came down hardly at all!!

 

[MustangMike]

Dave, that little 55 did just fine for a piece of wood that big. That was not what it was meant to do.

That was a piece of wood for your 660!

 

[Fruecrue]

That 55 sounded good till it got so much load on it. It was being pulled down right to clutch stall. With a super aggressive chain like that you may jave to hold it up/back a bit to keep the revs up in the powerband. How well did the 028 piston fit?

Piston was much taller, required clearance work between the bosses and a relief in the pop up for the spark plug. Don’t know how much I cut from the band, it was a lot.
Right now at 102.5/120/78 making 235psi on assembly with a single ring.

 

[Fruecrue]

Dave, that little 55 did just fine for a piece of wood that big. That was not what it was meant to do.

That was a piece of wood for your 660!

Thanks Mike.

 

[Fruecrue]

Piston was much taller, required clearance work between the bosses and a relief in the pop up for the spark plug. Don’t know how much I cut from the band, it was a lot.
Right now at 102.5/120/78 making 235psi on assembly with a single ring.

Don’t know if I’m done or not, thinking blowdown is a bit low, may end up around 100 on the exhaust.

 

[Fruecrue]

@Deets066 , I do appreciate your feedback.
That’s why I’m here.
I want to learn, play and build fast saws.
I wasn’t the generation that got a participation trophy.
If you won, you go for ice cream, if you lose, you practice.

 

[Deets066]

Don’t know if I’m done or not, thinking blowdown is a bit low, may end up around 100 on the exhaust.

I think you need a lower exhaust honestly. Those little saws like it low.

Chain and a muffler and I'd run her a bit before you change a thing

 

[cus_deluxe]

nasty crotch wood

That never makes for good videos. Lol.

 

[cus_deluxe]

I think you need a lower exhaust honestly.

Physically lower? Or more duration? Im thinkin you mean lower #, so more duration right

 

[huskihl]

I'm thinking physically lower...less duration...longer power sroke

 

[paragonbuilder]

Physically lower? Or more duration? Im thinkin you mean lower #, so more duration right

Higher number ex, physically lower on these small saws is usually better

 

[huskihl]

50cc. 110° exhaust opening

 

[cus_deluxe]

Higher number ex, physically lower on these small saws is usually better

Even though he already had to relieve the pop-up in the piston and has monster compression and wants a fast saw?

 

[paragonbuilder]

Even though he already had to relieve the pop-up in the piston and has monster compression and wants a fast saw?

I don’t see anything higher than 105 helping speed on this size saw. But I keep learning...

 

[cus_deluxe]

I don’t see anything higher than 105 helping speed on this size saw. But I keep learning...

Me too, im still in tard class lol. But ive seen 346s (i know this isnt a 346 but still) with exhaust ranging from 95-96 to 105 or so, and they both ran hard. Theres more to it than just exhaust # right? @Fruecrue could easily mess with blowdown and have a gain, or raise exhaust and transfers and have a gain, or cut base and band and piston more and have a gain as well. Thats what keeps us all comin back right haha

 

[paragonbuilder]

Me too, im still in tard class lol. But ive seen 346s with exhaust ranging from 95-96 to 105 or so, and they both ran hard. Theres more to it than just exhaust # right? @Fruecrue could easily mess with blowdown and have a gain, or raise exhaust and transfers and have a gain, or cut base and band and piston more and have a gain as well. Thats what keeps us all comin back right haha

Yep! Everything is a symphony on these. Seems like pick a place for one parameter and make the rest work with it. And angles matter as much as anything I think.

 

[cus_deluxe]

Yep! Everything is a symphony on these. Seems like pick a place for one parameter and make the rest work with it. And angles matter as much as anything I think.

And the intented use. Firewood saw numbers may not translate into play saw numbers the same way.

 

[Fruecrue]

Changed nothing except the wood.
Dipped into my firewood pile for some seasoned ash.
This time around I do believe it’s leaner than I originally thought.

 

[Fruecrue]

I'm thinking physically lower...less duration...longer power sroke

This jug is not going lower unless I relieve the pop up.
Original squish was .048
Used a factory base gasket and 028 super piston.
Crown was 0.142” higher than oem.
I’m at .022” squish now.
I cut a lot from the band, didn’t drop the jug at all.
If anything, there’s still some exhaust width to be had. Mayhaps that would be a benefit with only 17.5 degrees blowdown.