finally decided to pull it out and measure it

[Jeff Svoboda]

With dirt bike engines larger case volume creates more torque. Idk how true this is but remember reading it in several places.

 

[mdavlee]

Link that thread Mike we ain't skewered

You have to be a member to view it. Only 3 boards aren't private.
http://chainsawrepair.createaforum.com/index.php?topic=5779.0

 

[Definitive Dave]

I think that helps Kevin keep bandwidth costs down since he foots the bill out of pocket without sponsors. It's a good site with some good guys.
Dave

 

[stihl saws]

Picture of the new test subject naked.

 

[Glock37]

I wonder if the bearings had side plates to the inside and not letting the tranny fluid to get to the seals

Did all the bearings open ?


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[Definitive Dave]

Hmmm I can check. You are talking about the plastic shield that comes on some Stihl bearings right?
Dave

 

[Glock37]

No some have metal shields


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[Definitive Dave]

Wow I never realized or saw metal shields, I will definitely look at all the cc I tested

 

[Glock37]

Some of the older bearings from the factory had bearing shields on them the bearings now dont come with shields ive seen a few on older factory installed cases


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[Glock37]

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[SawTroll]

It's a 066 dave. My late 660 is like new and doesn't need a piston.
Someone will need what your offering.
I've got boxes of pistons. Thanks though

That sounds like a revolutionary design!

 

[Definitive Dave]

the early 066 has a metal shield on the PTO side bearing, that probably invalidates the measurement on that model, all the others were shieldless
I also measured a farmertec crankcase with crank with the same methodology from the first 6 crankcases and got a volume of 88ml

 

[stihl saws]

the early 066 has a metal shield on the PTO side bearing, that probably invalidates the measurement on that model, all the others were shieldless
I also measured a farmertec crankcase with crank with the same methodology from the first 6 crankcases and got a volume of 88ml

Great info here. My 660 is boxed up and headed your way in the morning.

 

[VinceGU05]

the 044 i stripped on friday had metal shielded bearings. i thought maybe someone had changed the bearings and left them on. surprised the factory was leaving them on. with shields on the mix wont get in to lube and cool the bearings.

 

[bikemike]

Picture of the new test subject naked. View attachment 19227

I like naked

 

[bikemike]

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If you have measurements of bearings od, I'd and width you can many other good options shielded, dual seal, non shielded, hybrid ceramic, and the very costly full ceramic that can run lubed or dry

 

[bikemike]

the 044 i stripped on friday had metal shielded bearings. i thought maybe someone had changed the bearings and left them on. surprised the factory was leaving them on. with shields on the mix wont get in to lube and cool the bearings.

The shields are mainly dust covers they will get lubed. sealed bearings are shielded with a seal molded to the shield and those won't se much lube from mix even with the vacuum and case pressure.

 

[Definitive Dave]

I completely zoned out on this thread
Stihl Saw's MS660 (many thanks for the loan buddy) measured at 90ml and I measured 4 others since with all four at the same 90ml.
I am going to post a summary of this thread in the 064/066/MS660 info thread in the tech section.
Dave

 

[angelo c]

If you have measurements of bearings od, I'd and width you can many other good options shielded, dual seal, non shielded, hybrid ceramic, and the very costly full ceramic that can run lubed or dry

IPL says "grooved ball bearing" 12 x 40 x 14( Fwheel) 6203

and the proprietary 17 x 40 x 14( clutch) one I removed from clutch side says NTN 2TS2-3A-SX0393 ( proprietary)

 

[blsnelling]

76ml - TIE early small bearing 066 and late 064
80ml - early 064
86ml - early big bearing 066
92ml - TIE both late big bearing 066

Stihl Saw's MS660 (many thanks for the loan buddy) measured at 90ml and I measured 4 others since with all four at the same 90ml.

Am I correct in the statement that a short case w/poly flywheel 066 is 86ml and a long case w/poly flywheel 066/660 is 90-92ml?