First Woods Port Attempt - Husky 372

[mt.stalker]

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[blsnelling]

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To a 2 year old thread

 

[mt.stalker]

To a 2 year old thread

Yes , I'm studying up :hmm3grin2orange: It's time to port my 371 . Never ported anything .....Yet ..... It's time to dive in .This way I can find the info easy , all in one place .

 

[dk27]

The info in Brad's post#37 can really bring this saw to an another level of performance.Not that it all has to be done at the same time .It could be You're 3rd or 4th stage of port work.All depends how much you want to get into it.

 

[davebull]

Here's a little tip for you. Lay your cylinder gasket on the cylinder base, mark it with a scribe, then port match the cylinder to the base using the scribed mark. This takes a lot of blending work, but is worth it.

At the same time, raise the cylinder wall at the transfer intake area up so that it's even with the cylinder base. Then add windows to the piston to look like a Stihl piston. Not only will it add flow, but it will help cool your piston crown.

If you wanted a windowed piston you could use a 272 piston but you would need to use a 52mm cylinder the 272 piston sits around .04" higher than the 372 piston, you could still run a base gasket without messing up timing and you would bring the squish down to around .002" ??? I havent done this personally and Im not sure if the .002 squish is to little?? BLsnelling what do you think?

 

[dozerdan]

Maybe not everybody's cup of tea, but this is how I do it.
The left side not done yet of course in the first pic.

I keep my walls and floor/roof pretty straight but I guess others could do things differently.
It has been mentioned that radiusing the side walls of the exhaust helps scavenge from the transfer sides of the cyl, but something I don't practice personally.
As Nanuk mentioned with the pencil and I grind the pencil down both sides with a curvature to one side. Also I don't think even then the pencil gets right in to the outside so make considerations for that also.

I also think that the inlet doesn't have to be opened as much as the exhaust keeping good velocity.

What make cylinder do you have pictures? The lower transfers are less restricted then the stock ones. I see the rest of the ports need some work but that's no big deal.

Later
Dan

 

[Bbrady]

I just tried a 266 windowed piston in the 50mm cylinder had to do some cylinder work but ended up with
Squish 18 thou
Exhaust 101
Transfers 130
Intake 80