395 xp big bore porting

[stuh]

What is a bearclaw muffler?

It's just a pipe that tees off with 2 outlets

 

[stuh]

Yeah, I think your uppers are too low. What’s your squish? It’s worth trying the saw with a bigger bar.

Squish is 40 thou. I can try it with a 36"

 

[stuh]

If you buy a hand piece, I'd be happy to ship it to you.

Ok thankyou, What websites would I find one on?

 

[Mastermind]

It's just a pipe that tees off with 2 outlets

Plumbing....on a chainsaw. LOL

 

[Mastermind]

Ok thankyou, What websites would I find one on?

CC Specialty

 

[thompsoncustom]

The brazing in the cylinder head, is that to increase compression?

it was and did work but I wouldn't do it again if I was going that route it would be welding. Everyone uses a lathe and cuts the base off the cylinder and that's the right way to do it for increasing compression its only in the really out there stuff that you need to start welding in the cylinder. I haven't yet but I might cut and weld a conrod to raise the piston higher into the cylinder (no stroke increase) along with having the cylinder cut but that's for one of those crazy odd ball projects.

 

[stuh]

That sounds pretty cool. I've got to make a mandrel, then I can cut bases on my lathe.

I've just been looking at my numbers for my OEM cylinder, intake is 79, exhaust 103, transfers 123 and blowdown is 20.
I'm thinking of taking the intake to 81, exhaust to 99 making blowdown 24 and widening intake, exhaust and lower transfers, squish is 29 thou and use a pop up piston.

Thoughts on those numbers?

 

[mgr1]

I haven't yet but I might cut and weld a conrod to raise the piston higher into the cylinder (no stroke increase)

What are you smoking?

 

[Mastermind]

What are you smoking?

A bearclaw muffler? LOL

 

[srcarr52]

Ok thankyou, What websites would I find one on?

I ship to NZ but I'm out of handpieces at the moment. I'll have more in stock by the end of this week.

Angled Rotary Porting Handpiece Kit

This small head, angled handpiece is great for grinding the upper transfer ports of small two-stroke cylinders. It works with any key drive, quick disconnect, flex shaft grinder such as Foredom, Dumore, Mastercarver, some Dremel, and many others. The push-button style dental head uses 3/32"...

luckydogmfg.com

 

[Ketchup]

That sounds pretty cool. I've got to make a mandrel, then I can cut bases on my lathe.

I've just been looking at my numbers for my OEM cylinder, intake is 79, exhaust 103, transfers 123 and blowdown is 20.
I'm thinking of taking the intake to 81, exhaust to 99 making blowdown 24 and widening intake, exhaust and lower transfers, squish is 29 thou and use a pop up piston.

Thoughts on those numbers?

Easy, but won’t perform as well. Machining and transfer work make a stronger saw. That’s why people do it. Buy the tool listed above. It’s excellent.

 

[stuh]

Easy, but won’t perform as well. Machining and transfer work make a stronger saw. That’s why people do it. Buy the tool listed above. It’s excellent.

So too long on transfers? More around 20° blowdown for a stronger saw? And if I machine the cylinder, would I go for a 20 thou squish

 

[Ketchup]

So too long on transfers? More around 20° blowdown for a stronger saw? And if I machine the cylinder, would I go for a 20 thou squish

20 blowdown but I like closer to 0.025” squish on bigger saws. They’re easier to pull and seem to spin better.

 

[thompsoncustom]

What are you smoking?

Obviously the good stuff! I've wrecked a handful of cylinders with experiments the crazier the better.

 

[stuh]

20 blowdown but I like closer to 0.025” squish on bigger saws. They’re easier to pull and seem to spin better.

Awesome, I'll see if I can get a port tool for transfers and have a crack at machining the base