Chainsaw Porting Theory

[Mastermind]

Remember...

Treemonkey has been saying that for years....

 

[drf256]

But do you think thats only for noise reduction, or does the front being solid aid in pressure wave reversion?

 

[tickbitintn]

I think yes on both...

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[czar800]

This is the cover on my 026 I've been second guessing how much I opened the front up.

 

[czar800]

This is the cover on my 024 it only has the pipe with stock front opening and it seems to run right with the 026?

 

[tickbitintn]

I have a 359 with the cat muffler I opened up the baffle and put an opening in the front with just a screen over it..... It's loud and I think is leaving some gains on the table.

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[David Young]

I think the side opening help muffle the sound. very few saw manufacturers go out the front.
the closest is the jungle style muffler from husky or dual port from stihl but even that is turned 90 degrees.

The ol boys down south with the muffler race saws go right out the front of the muffler.

I think the pipe is the way to go but no proof......Yet

 

[David Young]

This is the cover on my 026 I've been second guessing how much I opened the front up.

View attachment 13837
View attachment 13838

put a blank steel plate over the front hole. test it. then use a unibit step drill and increase the size testing on each 1/8" or 1/4" step

 

[jmssaws]

I've tested it many times fellas, the bigger the better and on the side.

Close your side port and put the same size hole in the front cover and you will feel it loose.

2" long 1 1/2" pipe on the side were the factory outlet is on a big stihl makes the most power on my saws. I have tested this many many times.

 

[czar800]

put a blank steel plate over the front hole. test it. then use a unibit step drill and increase the size testing on each 1/8" or 1/4" step

Next time I run both saws going to be swapping covers. I've thought about cutting a piece of metal and sliding it in and out like a stock muffler screen slides in.

 

[jmssaws]

 

[MG2186]

Next time I run both saws going to be swapping covers. I've thought about cutting a piece of metal and sliding it in and out like a stock muffler screen slides in.

Dam now I'm going to have make all new mufflers for saws, I got 2 pipes coming out front at angles on all of them


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[Canadian farm boy]

Now I have to remake/replace the front cover for the muffler on my 066. I'll be interested to see if I notice much difference

 

[jmssaws]

I've found on a 066 that a single big pipe outlet will out perform dual outlets.

 

[XP_Slinger]

Good stuff! Side outlet maintaining sound characteristics makes perfect sense! Guess I'm lucky all my saws got an additional side port instead of a port in the front. I did the mods this way because it made more sense function wise as far as burning wood and keeping the heat off my hands.

 

[jmssaws]

A oem dual port cover will set a dead tree on fire.

 

[Mastermind]

Now........don't be too hasty.

Point........counterpoint is the way to learn.

David nailed it, but no one was listening.

The ol boys down south with the muffler race saws go right out of the muffler.

Wanna make it scream........straight out the front, but below the exhaust port works.

For a strong work saw.........out the side seems to make the most power at a lower RPM.

 

[drf256]

Now........don't be too hasty.

Point........counterpoint is the way to learn.

David nailed it, but no one was listening.



Wanna make it scream........straight out the front, but below the exhaust port works.

For a strong work saw.........out the side seems to make the most power at a lower RPM.

Gotta be some wave reflection.

I'm seriously thinking cone funnel out into larger cone funnel in.

 

[jmssaws]

I don't know anything about a race saw but a work saw it works best out the side.

I took the front cover off a 660 and the Only thing it changed was noise,stock saw though,never tried with a ported one

 

[countryhog]

In