372 xt

[peak performance]

Numbers after taking 0.020" off the cylinder.
Squish before 0.046" after 0.026"
Before 99/117/75 after 101/119/77

 

[Sloughfoot]

Bet that gives it more gusto. You doing anything else to it?

 

[quattro.pilot]

wow i wouldn't have guessed the factory squish to be so loose

 

[Sloughfoot]

wow i wouldn't have guessed the factory squish to be so loose

40s was common in that era. Often more than that on saws from the 70s and 80s. I don't believe there are very many saws today that come factory in the low 20s.

 

[peak performance]

Bet that gives it more gusto. You doing anything else to it?

I'll raise the exhaust a hair to 99 again and rough up the intake and I think that might be it. Blowdown will be raised a bit doing that. I shed a few grams of the piston as well to lighten it up.

 

[peak performance]

wow i wouldn't have guessed the factory squish to be so loose

That was a new hyway cylinder and pop up piston I was surprised it wasn't a bit tighter

 

[Stump Shot]

That was a new hyway cylinder and pop up piston I was surprised it wasn't a bit tighter

Hyway is known for plating peeling issues when ported. Best to just port out the exhaust port and leave it untouched at the cylinders edge.

 

[quattro.pilot]

Hyway is known for plating peeling issues when ported. Best to just port out the exhaust port and leave it untouched at the cylinders edge.

Thoughts on Meteor cylinders? My presumption is they'd be pretty good aftermarket.... I like their pistons at least

 

[EFSM]

Thoughts on Meteor cylinders? My presumption is they'd be pretty good aftermarket.... I like their pistons at least

I haven’t used them, but those who have say the plating is crazy hard. Otherwise they’re your ordinary Taiwanese casting, just plated in Italy.

 

[peak performance]

So the saw is going back together 100/119/77. Curious, should I lower the intake floor a hair to try and get 78 maybe 79? Would it be worth it?

 

[Sloughfoot]

So the saw is going back together 100/119/77. Curious, should I lower the intake floor a hair to try and get 78 maybe 79? Would it be worth it?

I would. I'd widen the exhaust to the limit as well.

 

[peak performance]

I would. I'd widen the exhaust to the limit as well.

Ya i think I'll trim off the intake side of piston to get 78 or 79. Exhaust is opened up already. Getting close to see it run

 

[Sloughfoot]

I think you'll like it a lot.

 

[Stump Shot]

Thoughts on Meteor cylinders? My presumption is they'd be pretty good aftermarket.... I like their pistons at least

Toughest cylinder I've come across, is more difficult to work over. I consider it the best AM replacement cylinder option, especially for stock saws, or mildly built ones.
I always tell the story of the 660 that came in with one that broke the top ring off and chewed it up and spat it out. The top of the piston looked like the surface of the moon, the cylinder, not so much as a scratch on it.
The only one I ever fully ported; I bent the boring bar and wrecked the tool holder trying to machine the squish band. I really had a time trying to get a carbide cutter to get through the plating when porting and even the aluminum was tougher and harder than any OEM cylinder I've come across.
I recently put a 357xp Meteor P&C kit in my 359G saw that I have. OEM stock has dried up and the few that were left are going for more than the whole saw is worth. I just set the squish by turning down the base and ported out the exhaust port without getting near the cylinders edge and left the rest alone. The saw runs plenty good like that and am happy with it for a firewood saw when heated handles are desirable.

 

[quattro.pilot]

Toughest cylinder I've come across, is more difficult to work over. I consider it the best AM replacement cylinder option, especially for stock saws, or mildly built ones.
I always tell the story of the 660 that came in with one that broke the top ring off and chewed it up and spat it out. The top of the piston looked like the surface of the moon, the cylinder, not so much as a scratch on it.
The only one I ever fully ported; I bent the boring bar and wrecked the tool holder trying to machine the squish band. I really had a time trying to get a carbide cutter to get through the plating when porting and even the aluminum was tougher and harder than any OEM cylinder I've come across.
I recently put a 357xp Meteor P&C kit in my 359G saw that I have. OEM stock has dried up and the few that were left are going for more than the whole saw is worth. I just set the squish by turning down the base and ported out the exhaust port without getting near the cylinders edge and left the rest alone. The saw runs plenty good like that and am happy with it for a firewood saw when heated handles are desirable.

Right on perfect good to hear some first-hand machining experience. I feel ya re: OE cylinders.. they are getting hard to find (for the older saws) and are STUPID expensive... i'm going to be in the market for a 372 jug and it's nice to know I could confidently just get a Meteor product and move on with life. Give Wolf Creek some business and just cringe over the exchange rate haha

 

[Stump Shot]

Right on perfect good to hear some first-hand machining experience. I feel ya re: OE cylinders.. they are getting hard to find (for the older saws) and are STUPID expensive... i'm going to be in the market for a 372 jug and it's nice to know I could confidently just get a Meteor product and move on with life. Give Wolf Creek some business and just cringe over the exchange rate haha

If a used OEM cylinder can be sourced reasonably, that can be a good option too, just buying a new piston.
I look at it this way, a piston is one of the easiest parts to make, a cylinder on the other hand, is one of the hardest.

 

[quattro.pilot]

If a used OEM cylinder can be sourced reasonably, that can be a good option too, just buying a new piston.
I look at it this way, a piston is one of the easiest parts to make, a cylinder on the other hand, is one of the hardest.

Roger.. good used is certainly ideal, and I've thrown meteor pistons into lots of old cylinders (kinda my go-to "rebuild" process). i've unfortunately had several negative experiences buying used cylinders, folks generally lie about the condition and deliberately provide images which don't represent damage. i've learned my lessons random strangers can't be trusted and if I were to do it again I would specifically wait and deal only with a very reputable and visible forum member. Mia Culpa. anywho don't mean to derail the thread..., it's great peak performance shared with us some of his timing numbers.. he's in my province somewhere so maybe i'd ask him to do some porting for me. i think a ported OG 372xp is about the best rig for all-round work a guy could ask for.