066/660 Big Bore - can it be great?

[jmssaws]

Red light cases are also the smallest capacity which may hinder feeding the extra cc's

 

[Glock37]

But isnt that what you want Like the 446 hybirds


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[jmssaws]

But isnt that what you want Like the 446 hybirds


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Possibly, I've never put a 56 cylinder on one.
I'm just speculating

 

[Chris Zautner]

Smitty built saws has a video of one with a 056 mag topend

 

[paragonbuilder]

Smitty built saws has a video of one with a 056 mag topend

I love that rooster tail every time I see it!


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[wcorey]

One thing that hasnt been brought up... Generally the bb cylinders of any kind are as Dave mentioned copied from the stock castings and simply bored larger.
The bore gets pushed out into the transfers and so reduces their cross sectional area.

It's hard to recover that with only grinding, welding them up wider can be an option but typically the flywheel and/or case then needs to be cleared.

 

[Terry Syd]

One thing that hasnt been brought up... Generally the bb cylinders of any kind are as Dave mentioned copied from the stock castings and simply bored larger.
The bore gets pushed out into the transfers and so reduces their cross sectional area.

It's hard to recover that with only grinding, welding them up wider can be an option but typically the flywheel and/or case then needs to be cleared.

That's the problem with the 77cc BB jug for a 365/372 Husky. It takes a fair bit of work to the lower part of the jug and the piston to get the BB jug to flow properly. Most of the transfer flow occurs just before BDC and with the piston at BDC there isn't much space left for transfer flow.

 

[Chris Zautner]

Here's another video 0f the 066 with a 056 mag Topend

 

[paragonbuilder]

Here's another video 0f the 066 with a 056 mag Topend

That thing is nasty!


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[Chris Zautner]

That thing is nasty!


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Dear Santa All I want for Christmas is a
1 Stihl ms 441 rcm ported by Alan. Check...
2 stihl 066 with a ported 056 topend from Bret. No Check Yet
3 Stihl 066 ported Hybrid by Jason. No Check Either yet
4 McCulloch kart saw Ported by Alan. No check either yet

 

[MustangMike]

I've run that Smittybilt hybrid (660/056) and it is an animal. It certainly gets your attention!

I remember seeing Bret cut some Black Locust with it at the upstate NY GTG a few years back, and the chips were going about 30 feet behind him.

 

[jmssaws]

I've talked to him about that saw,I'd love to run it.

 

[paragonbuilder]

I've talked to him about that saw,I'd love to run it.

I ran it! It's nasty!!!


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