066 with low compression

[jmssaws]

The chamber has bn cut and the cylinder lowered or some piston work, squish that big a 066 won't have that much compression without work. It's probably ported.

What cylinder is on it?

 

[Adirondackstihl]

The chamber has bn cut and the cylinder lowered or some piston work, squish that big a 066 won't have that much compression without work. It's probably ported.

What cylinder is on it?

I have a stock 044 with 0.035" pushing 172lbs
Just sayin

 

[Mastermind]

I wish I knew the brand of AM jug.......

You guys watch HL Supply for a new performance orientated 066/660 top end to be released. I ported and machined a new OEM top end, and Bruce sent it to be used as a model. He's been sending me samples of top ends for several saws over the last few months, and they have been of very nice quality. We are doing a MS661 top end now......

 

[jmssaws]

I have a stock 044 with 0.035" pushing 172lbs
Just sayin

I had a stock 395 with 195lb but it or a 44 isn't a 066, I've had a 100 or more in the shop and haven't ever cn one that high. 150 lb is the norm.

 

[Adirondackstihl]

If this saw had any machine work, why would the builder leave the quench area so loose?

 

[Haywire Haywood]

Does it still have the base gasket? Sounds like a good candidate for a delete.

 

[Adirondackstihl]

Does it still have the base gasket? Sounds like a good candidate for a delete.

Agreed

But typical OEM gasket is 0.020"
Take that away from 0.032" and there isn't enough room there IMO.
He'd need to find some 0.008" shim stock.

 

[jmssaws]

I have some oem gaskets that are 010 and 017.

 

[Mastermind]

I have some oem gaskets that are 010 and 017.

Pics?

 

[jmssaws]

 

[Mastermind]

New?

 

[Adirondackstihl]

PN#?

 

[Mastermind]

I do think there is a thinner base gasket that is used in higher elevations. I'd have to dig thru media cat.......

 

[jmssaws]

No its used, I've got a stack and they'll go from 010 to 017. I have some oem paper one's that are 035 I believe

 

[jmssaws]

I've never used a new one, I just dig through the pile I got for the one I want.
I stopped using sealer, I make to much of a mess with it, if the base is thick enough that is.

 

[Adirondackstihl]

 

[Brewz]

There is also the chance that the guage reads high but it was very close when hit with my air compressor

I have had the jug off once and did not notice and modification but will pull it again on the weekend as you lot have me curious now
It definitely has a gasket in it
No idea of the brand but I will see what I can find out. I still have the original owners number.

It's not ported, I had to remove the factory lips and burs from the casting in the ports. The intake port had a big 2mm lip along the bottom of the intake port

I might take it to the Stihl shop and ask if their mechanic can screw in his compression tester

 

[Adirondackstihl]

 

[jmssaws]

I've had the cylinder off my 064 50 times and have never changed the gasket.
It's a piece of metal, if it was fiber I would change it.
Trying different things and having the cylinder on and off the sealor is a pain.

 

[jmssaws]

There is also the chance that the guage reads high but it was very close when hit with my air compressor

I have had the jug off once and did not notice and modification but will pull it again on the weekend as you lot have me curious now
It definitely has a gasket in it
No idea of the brand but I will see what I can find out. I still have the original owners number.

It's not ported, I had to remove the factory lips and burs from the casting in the ports. The intake port had a big 2mm lip along the bottom of the intake port

I might take it to the Stihl shop and ask if their mechanic can screw in his compression tester

I wouldn't remove that lip in the intake, the less intake the better.