Anyone using modded saws?

[ScotClayShooter]

 

Muffler mod for Makita 7900

 

Stihl 036

[Rob D]

I sent a muffler for an 880 to be modified by Scott Wajtasik. He's in the States but all he does is specialise in modding mufflers (exhausts).

 

Can't wait to get it back and will post some pics and vids when I do.

 

If you want more info you can e-mail him on [email protected]

 

Let me know if this e-mail address is correct as have just formatted computer.

[Rob D]

Here I sit in somewhat amazement.You folks in the UK have been proven to build the fastest 2 cycle motorcycles in the world but darned few tinker with saws.Now why is that???

 

I have learned more about porting 2 cycle engines on British motorcycle web sites than all the reading I've ever done.You guys are going to have to get with the program now.

 

I remember mentioning on another forum about modding an 880 and you gave me some good advice Al. But not being a practical sort I've had the muffler modded in the states.

 

I think we're well behind here ref modding saws but it seems now there are plenty people starting to fiddle about!

[Al Smith]

Well revamping a muffler is an easy thing ,anybody with a little mechanical ability can do it . You have to do though what works best for you .

 

Now let me give you a word of caution on an 880 .Do not forget to enriched the carb setting . That thing will move a lot more air and fuel through it with an improved muffler and if you don't increase the fuel it will seize the piston in time . Am 880 is an expensive powerfull saw .It would be a shame to ruin it .

 

That said though the saw will run a lot better with improved flow .

 

I'm supposed to be getting an 084 from the Canadian west coast shipped to me sometime . That thing will get turned into either a gas muffler race saw or a tuned pipe saw .

 

At the moment though I'm preoccupied building a bandsaw mill so the saw modifications are somewhat on hold for the next few months .

[Al Smith]

I sent a muffler for an 880 to be modified by Scott Wajtasik. He's in the States but all he does is specialise in modding mufflers (exhausts).

 

Ha Ha Ha .I have to tell a little story on Wojo . Old Scott shows up at one of our get togethers and they let him run a piped hotsaw,3120 Huskey or 084 Stihl,I forget which .

 

Old Scott throttled that thing up and made the cut then jumped back like he had seen a ghost . A single cut on a 10 by 10 only takes about a second or so and he had never had that much power in his hot little hands in his life .

 

We of course teased him about a little ,all in good fun .

[ScotClayShooter]

 

Yep Al they dont need to be over pretty to work well.

 

Im not so proud of the welds on this one, The welder was not playing nice that day.

[Al Smith]

.

 

Im not so proud of the welds on this one, The welder was not playing nice that day.

There is a trick to every thing . When you make your shroud bend long tabs on it so you have more surface are to work with .Makes it much easier on thin sheetmetal and as thus a stronger joint .

 

I just braze them myself .

[Rob D]

Ha Ha Ha .I have to tell a little story on Wojo . Old Scott shows up at one of our get togethers and they let him run a piped hotsaw,3120 Huskey or 084 Stihl,I forget which .

 

Old Scott throttled that thing up and made the cut then jumped back like he had seen a ghost . A single cut on a 10 by 10 only takes about a second or so and he had never had that much power in his hot little hands in his life .

 

We of course teased him about a little ,all in good fun .

 

 

I'll have to remind him about that!

 

He's keen to get his business of muffler modding up and running and if this 880 works out I will be pushing his business over here.

 

And thanks I'll be enriching the carb than posting the vid of the saw running...

 

I know it doesn't take a lot to mod a muffler but if someone put a welder in my hands I wouldn't know which end to hold and which end to point!! Later in life when I have more time I'll start doing things like this myself.

[Tom D]

I understand the principle of an exhaust mod but could someone tell me exactly what you're doing to them? Is it just widening the outlet or are you drilling out the baffle plate too? and if so is 1 big hole in the baffle better than lots of little ones?

[Al Smith]

Well first of all you have to look at a modern saw muffler .It is essentually a pressure regulating device with baffles and a certain sized exhaust relief hole in it or several .

 

The baffles control the sound by attenuating the pulses back upon themselves just like an auto muffler . The shell of the muffler contains a certain sized volume .

 

Depending on the size of the hole or holes at a specfic time at exhaust the pressure within this can equals the out going pressure of the cylinder .At that point any more transfer of fuel/air mixture ceases to flow.The cylinder is as full as it's ever going to get because of lack of differential pressure .

 

Now if you remove the baffles,first you have nothing to hinder the flow of the exhaust except the pressure can .By enlaging the hole or holes you allow the transfer cycle to flow longer and with increased velocity .Thusly more fuel is admitted to the cylinder plus the fact it's of a more pure nature because more of the burn exhaust is expelled . More power ---clear as mud .