Thread: porting chainsaws

I am working on some saws for lumberjack comp. and was wondering if anyone could give me some input on what degrees to port them on. I am currently porting the ex. to begin to open at 84 degrees atdc and the intake to close at 85. Im fairly new to all this and thats what I was told worked best.

Howdy Husky 2100,

Does that monicker mean you have the shakes? I remember that saw model as one you could fire up, set down, and it would beat you back to camp!

Regards,
Walt Galer

those old 2100s would beat you back to camp if didnt tie it down

a 285 piston and jug will bolt right in.I even have a 2100 with the 258 parts on it.
Later
Dan

what would the cubic in. be when you do that

This one beat me home tonight and was waiting at the door.
John

lol - thats gotta be the most beautiful saw i have ever seen..

Hello Husky 2100,
Excellent 6 cube saw to modify. Their getting a little hard to find anymore. If you didn't cut the top off the barrel and build a head thats too much exhaust. with the stock head it has a 11.5 cc combustion chamber volume. you need to build a cylinder head with around 6-7 cc combustion chamber volume . you'll then have a 9.5 corrected compression ratio. stock it has just under 6-1 corrected compression ratio. Included a picture of a modified 272 husky barrel. we've changed the transfer duration and shape and added a boost port for more transfer flow

Ken Dunn kdhotsaw@hotmail.com

The boost port is the dogleg from the transfer port?
How deep is that, and how much does it help?

Harley

Hi Harley
The transfer ports on a chainsaw motor are way to small in area. the boost port s bring the transfer port area up to normal 2 stroke transfer area. makes more power. the newer huskys went to a quad port design,372's,385',s . they really flow more than the older design . a 372 just walks all over a 272 and the power increase is all in the transfer port design
ken

hello again harley,
the boosts are about 2.5mm deep and 8mm wide
ken

hello ken thanks for the info. i am putting heads on all my saws and doing the boost ports like yours. on the transers about what degree atdc do you do yours. i am currently doing mine to start to open 30 degrees after the ex starts to open. talking about the new cyl design i have a 346 xp i built last year for the 3 cub. class it has a head on it with a 314 hl running alchohol with 60% nitro and it seems like its going to do very well. RPM unlimited.

Hi H-2100
Thats a lot more transfer duration than we use but we cut 24-32 inch logs. you must be cutting 8 or 10 inch cants running a ten pin sprocket. we have to use less exhaust and transfer duration so we dont pull the saw down out of its power band.I have a 090 that we used menthonal with nitro . scary , it cut at 18500 and sounded like it was ready to grenade. only cut with it like that a couple of times but it was fast
Your post on the racing chain thread is right on the money but you must be willing to devote considerable time to filing chain to get where you can make fast chain
ken

An 090 at 18500 rpms? Are you suicidal? Next time you do that you HAVE to get a video clip and sound bite of that. Every time I turn my computer on I can listen to a Stihl about to EXPLODE

Hello Huskyman,
Exactly right. My neighbor, a former husky dealer and chainsaw competitor who still runs his 460 maico hotsaw at some of our shows was helping me get the 090 ready, he just looked at me in disbelief on the first cut. then he ran in the shop and got my tack and checked the rpms before the second cut. we decieded to quit while the saw was still running. just used 50 percent menthonal and 50 percent racing fuel after that. but it was one awesome sound it made.
ken