Mastermind Meets The MS661 Again

[MustangMike]

Here in the North East they do not do much clear cutting, and those big machines would be too destructive and not efficient enough to operate in those situations. I think there will always be a need for a man with a saw.

A well ported saw will definitely enable you to increase your productivity.

 

[Mastermind]

Trying something outside the box.....

 

[KG441c]

Wow!! More turbulence??

 

[luckydad]

Whew that stuffs high dollars sir !!

 

[Mastermind]

Yeah.....it ain't a damn bit cheap Chris.

No Keith, I want to lower the intake duration.

This jug is one I had from the first 661 I ported. I didn't lower the exhaust port,and it just didn't make the power I was looking for. In order to be able to further cut the squish, I need to raise the floor of the intake so it's not crazy low.

 

[MustangMike]

I'm lost here Randy. At first I thought U were putting in golfball type dimples in the air intake, which I could understand trying, but then I see all the Aluminum putty and I am lost.

 

[Mastermind]

Look at the post just above yours Mike.

 

[MustangMike]

Sorry, I posted before UR post showed up, OK, I get it.

But hey, golfball dimples may not be a bad idea? They say they can make a ball go further!

 

[KG441c]

The devcon stands up to heat and wear pretty good Randy? Ive used it to install a outboard lower end nose bullet and its held for years

 

[Mastermind]

I'm not sure I'd use it on a customers unit. But this is just a R&D thing.

 

[Four Paws]

Trying something outside the box.....

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It should work fine on the intake, Randy. I have been wanting to raise the floor of the exhaust port on a couple cylinders. I wish the saws I am working on had longer piston skirts. I would like to drop the jug lower but cannot as it will freeport at TDC. I didn't know if anything would stand up to the heat on the exhaust port other than welding it up. But, it would have to be bored round again, would have no plating and may gall. Pretty nice those Stihl pistons have such long skirts.

 

[KG441c]

What about patching a transfer or exhaust port if went too deep ?

 

[Four Paws]

But hey, golfball dimples may not be a bad idea? They say they can make a ball go further!

Look at the intake boots. They already exist.

 

[Mastermind]

I've built a few saws that freeport at TDC. One was over .060 over the exhaust. It didn't seem to hurt anything. If it was more, I'd be worried about polluting the crankcase.....

 

[Ron660]

Any plans on sending it to Chad for dyno testing?

 

[Mastermind]

I told Chad to let me know when he's ready. I can send a ported one, and a stocker.

 

[Deets066]

I told Chad to let me know when he's ready. I can send a ported one, and a stocker.

Is he ready yet!

 

[Mastermind]

Hell, I've got two more on the way......these are gonna be a common sight.

 

[Four Paws]

I've built a few saws that freeport at TDC. One was over .060 over the exhaust. It didn't seem to hurt anything. If it was more, I'd be worried about polluting the crankcase.....

.060" is significant. Glad to hear you didn't experience any negative effects. What kind of runtime did you have on it? Ever pull it back down to inspect? Would imagine that it would keep the exhaust port clean. Wondering if it would help to actually increase intake velocity (as charge escapes out the exhaust) and help fill the crankcase with more charge than normal.

 

[Mastermind]

Neal Murphy has that saw.......it's been 3 -4 years since I built it.

It was my entry in the MS460 build off.

I ran the **** out of it........

I did have to tear it down once........I swapped a damaged case half after a year or so. It was nice and clean throughout.