Let's see some piped saws !

[tree monkey]

 

[tree monkey]

 

[tree monkey]

 

[tree monkey]

 

[drf256]

I'm still trying to figure out what a tuned pipe does for a saw.

I understand that the harmonics help pull exhaust out but also keep unburned chase in the cylinder.

Do porting numbers need to be changed to take full advantage of a pipe? If so, how?

I need to do some reading on the subject.

What programs are people using for the templates for the cones? I can Tig weld, and stainless is pretty easy. I'd need to back purge though.

 

[Deets066]

Pipes like a higher exhaust than what you would normally use for a work saw, more blowdown and longer intake duration

 

[Adirondackstihl]

@spencerpaving

 

[Cut4fun]

166 piped first cuts set fat after rebuild.

 

[Cut4fun]

Nuff said = Helsel ported piped stroked 3120

Over look poor azz operator.

 

[Magic_Man]

Nice pics and vids fellas, gotta love that sound.

 

[Adirondackstihl]

Here's a pipe Gink built

 

[Cobby08]

This must be the 'wet dreams' thread...


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[P.M.P.]

Thats a nice firewood saw you got there people that see you cuttin in the woods with that be like this

 

[Cobby08]

@spencerpaving
2015 gtg


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[Cobby08]

@spencerpaving
2015 gtg again


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[Adirondackstihl]

 

[dieselfitter]

I'm still trying to figure out what a tuned pipe does for a saw.

I understand that the harmonics help pull exhaust out but also keep unburned chase in the cylinder.

Do porting numbers need to be changed to take full advantage of a pipe? If so, how?

I need to do some reading on the subject.

What programs are people using for the templates for the cones? I can Tig weld, and stainless is pretty easy. I'd need to back purge though.

I'll give a shot at explaining it. Going from memory and making up the rest.
As you can see it is basically two funnels end to end. The exhaust exits into the first funnel as the diameter changes, is slows velocity and crates a vacuum to pull exhaust and unburned air/fuel mixture out of the cylinder. The exhaust then hits the restriction of the other funnel. This creates a shock wave of compressed exhaust which bounces back to the exhaust port of cylinder. Just like a shock wave radiating from an explosion as seen in slow motion film. This compressed wave is the un-burned air fuel that was pulled out of the cylinder earlier. The piston closes the exhaust port after the wave enters the cylinder, trapping it. At that point the cylinder has compressed fuel air mixture in it before the piston has even started compressing it. The diameter, rate of taper, engine rpm are just a few of the variables involved in designing the pipe. I have been lucky to have a conversation with Scott about pipes. It's cool stuff.
FWIW that is my understanding.

 

[Frank bierce]

Smoky hokes...nice saw.

 

[Magic_Man]

WOW !

 

[Cut4fun]

Helsel 3120 saws run good with belly pipes. Not just for looks like others 3120's