066 Rebuild, Port Job etc

[drf256]

With a Mandrel

.060 out of the band may be too much with the 288 piston.

 

[Brewz]

060 too much........... I know.
Thats why I raised it here.
The maths says its right but something else says to stop and ask

 

[drf256]

The 288 piston should have a lower compression height.

So more out of the band should require less of a squish cut than with a 66 piston IIRC.

 

[mdavlee]

I use a mandrel with a cutter in it. I would cut .040" out first and then .100" off the base. Then check.

 

[T.Roller]

@mdavlee knows nothing about saws, or chains for that matter

 

[mdavlee]

@mdavlee knows nothing about saws, or chains for that matter

Nope. You're right. I'm a poser, hack at best[emoji41]

 

[jmssaws]

060 from the chamber will free port it

 

[jmssaws]

The ring doesn't have to be gone,it just needs to be where it won't hang.

.100 is to much

 

[mdavlee]

060 from the chamber will free port it

He was putting a gasket in to raise it back up .017" or whatever the thin gasket is. He'll have to go farther than you do.

 

[jmssaws]

You want to just get the ring where it won't hang, every cylinder will be different but you want to cut as little as possible from the base.

I cut the base first then cut the chamber for a 020 squish. There's a fine line of getting the ring outof the intake and not free porting it. Some cylinders aren't good for it.

 

[jmssaws]

He was putting a gasket in to raise it back up .017" or whatever the thin gasket is. He'll have to go farther than you do.

I always use a gasket, I hate sealor.

017 is generally what they are.

 

[mdavlee]

I'd rather use a gasket on a stihl. Husky sealer works better than that paper gasket.

 

[jmssaws]

I'd rather use a gasket on a stihl. Husky sealer works better than that paper gasket.

Yeh damn huskys.

 

[mdavlee]

Yeh damn huskys.

Dolmar uses metal gaskets just like stihl. I wish husky would get with the program.

 

[Moparmyway]

You want to just get the ring where it won't hang, every cylinder will be different but you want to cut as little as possible from the base. There's a fine line of getting the ring outof the intake and not free porting it. Some cylinders aren't good for it.

There dang sure is a fine line...... And I'm on the other side of that line, mine freeports. I'll wait for a nice 660 to see how mine runs

 

[jmssaws]

040 is about it.
I don't hide the whole ring,about half of it gone will make everything much easier.

 

[Brewz]

I know why I have worked out .060 from the squish
I am measuring direct up and down distance but the distance will change with the arc of the motor.

 

[Brewz]

I will measure it again aiming to stop the ring catching.
Will probably be about .070

 

[Deets066]

I will measure it again aiming to stop the ring catching.
Will probably be about .070

Mount the jug, run the piston to BDC and measure from intake roof to center of ring land, that's how much you should cut your base. Then cut your squish for .018-.020

 

[Brewz]

Will be doing that tomorrow

I now have my head wrapped around this good and solid

Look out!!