Ms660 bearings

[GoBigBlue1984]

He's not getting stock. I'm gonna mod mine too while I'm at it. Plus, he'll never know if he doesn't try it. We're not gettin crazy here. Just building him a reliable high powered work saw.

 

[huskihl]

I think with a 20 on it, if ported right, it'll spin 8 or 9 teeth all day. You'd have to have an aggressive chain to stall mine with a 20" bar. It'll pull a buried 36" with 8 teeth

 

[GoBigBlue1984]

Stock numbers
Ex/95
Transfers/123
Intake/77

 

[GoBigBlue1984]

What is the reasoning behind intake side of transfers opening 6-7 degrees before exhaust? Strictly flow?

 

[GoBigBlue1984]

Squish on this same jug is .037 w/ gasket.

 

[fin460]

subbing in

 

[GoBigBlue1984]

I realize the angle of the cylinder and everything when mounted, but this has to be by design? Perhaps not?

 

[Brewz]

What is the reasoning behind intake side of transfers opening 6-7 degrees before exhaust? Strictly flow?

It is so the initial burst of fresh charge is pushed to the intake side, which rounds up more of the spent charge and pushes it out the exhaust.

This reduces charge dilution and aids in making more power.

The more spent charge you can force out with minimal mixing with fresh charge will result in more fresh fuel and air in the motor each time.

That means a bigger bang and more power.

 

[MustangMike]

Just like what bridge ports are intended to do.

 

[Brewz]

Has anyone tried the Chinese copies of the bearings

 

[mdavlee]

I like opening exhaust side first on quad ports. I go level on stihls with dual transfers

 

[Moparmyway]

Stock numbers
Ex/95
Transfers/123
Intake/77

WOW !!
The closest one that I've seen to that had more intake

 

[mdavlee]

I've seen them all over the place. Probably a mahle decomp jug.

 

[Brewz]

I have 2 here that measure about the same.
One is older Stihl 066
The other is KS MS660

94
122
80

+/- 0.5 deg...... I am no expert

 

[GoBigBlue1984]

You are correct Mike, Mahle decomp.

 

[GoBigBlue1984]

Cut .010-.015 from chamber, .027-.032 from the base.

How about evening up the transfers or leaving them be?

 

[David Young]

Cut .010-.015 from chamber, .027-.032 from the base.

How about evening up the transfers or leaving them be?

I think you should go 20 from the chamber 37 from the base should put you around 80-81 on the intake 98 99 on the exhaust then just raise the transfers 1mm. I would flatten them but have never tried to keep them angled. I know Joey and Al have tried it.

 

[jmssaws]

using a stock piston?

 

[GoBigBlue1984]

Considered the 288 piston but on this guys I'm gonna run new meteor 660. I'll try 288 piston in my personal saw.

Do you even out uppers Jason?

 

[jmssaws]

Considered the 288 piston but on this guys I'm gonna run new meteor 660. I'll try 288 piston in my personal saw.

Do you even out uppers Jason?

Not anymore. The least you can do to the transfers the better it will run.