Homelite410
Hack with a CNC Mill
- Joined
- Mar 9, 2010
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That is where factory opening was. Those are 1" od pipes.Homelite, do you leave the OEM muffler opening open too? What size are those pipes?
That is where factory opening was. Those are 1" od pipes.Homelite, do you leave the OEM muffler opening open too? What size are those pipes?
That is where factory opening was. Those are 1" od pipes.
Ok, so being the OCD skeptic I am, the results of muffler mods all seem to be anecdotal. While I have heard some great sounding mods, the question remains: What's the proof other than the sound that they actually do anything? My experience is from the Motorcycle and Snowmobile worlds. There's a lot of "seat of the pants dynos" but when you actually throw some stuff on a no kidding dyno, there's no gain and in some cases there's even a loss of performance. From what I know about building two stroke exhausts there's a lot of physics and math involved that have been boiled down to things that work and things that don't. Simply drilling a hole or punching fins in the can that exists doesn't seem to follow the published knowledge of gaining power from a two stroke. Someone please explain...
Ok, so being the OCD skeptic I am, the results of muffler mods all seem to be anecdotal. While I have heard some great sounding mods, the question remains: What's the proof other than the sound that they actually do anything? My experience is from the Motorcycle and Snowmobile worlds. There's a lot of "seat of the pants dynos" but when you actually throw some stuff on a no kidding dyno, there's no gain and in some cases there's even a loss of performance. From what I know about building two stroke exhausts there's a lot of physics and math involved that have been boiled down to things that work and things that don't. Simply drilling a hole or punching fins in the can that exists doesn't seem to follow the published knowledge of gaining power from a two stroke. Someone please explain...
Again, have watched and enjoy a great mod video. The sound of some are amazing, but what is the objective measure of "real gains?"
I know a lot of people who bolt $500 intakes and $1300 exhausts to their cars and swear up and down that the improvements are awesome. Yet many magazines who look at things objectively throw the same combos on the same cars and get 8-10HP. Yet to listen to the owners, they bolted on 50Hp. In my experience, performance gains on ones own stuff suffers from a self serving bias. Im not saying they do nothing, but man how do you prove it? Don't you want to really, objectively know that its worth the effort? I do.
I understand the air pump analogy. But a 2 stroke is a pump without a valve train. To make it efficient (ie more power per CC cylinder volume), a method has to be devised to help scavenge the exhaust and pull fresh FA charge into the cylinder. That is historically done through the utilization of exhaust with regard to timing and cylinder volume. The mufflers as they come from the factory work, but with all the mods, not apparently as well they could. But to know what to do, what actually makes it better vs louder shouldn't they be tested? Objectively?
Has anyone muff mod a jonsered 2171. And was there a notice able power differance?
One thing I would suggest is for you to buy a inexpensive after market muffler and do some experimenting with muffler mods. That way you can see for yourself.Ok, so being the OCD skeptic I am, the results of muffler mods all seem to be anecdotal. While I have heard some great sounding mods, the question remains: What's the proof other than the sound that they actually do anything? My experience is from the Motorcycle and Snowmobile worlds. There's a lot of "seat of the pants dynos" but when you actually throw some stuff on a no kidding dyno, there's no gain and in some cases there's even a loss of performance. From what I know about building two stroke exhausts there's a lot of physics and math involved that have been boiled down to things that work and things that don't. Simply drilling a hole or punching fins in the can that exists doesn't seem to follow the published knowledge of gaining power from a two stroke. Someone please explain...
Dare I go there, but in some instances, a stuffed muff isn't too bad. LolSome saws don't gain a whole bunch if they were free flowing to begin with. Others are so choked up the muffler mod is at least 60% to 70% of the gain you will receive on a work ported saw.
You could port the hell out of some saws, but if the muff is stuffed you will not see the potential.
Ok, so being the OCD skeptic I am, the results of muffler mods all seem to be anecdotal. .... My experience is from the Motorcycle and Snowmobile worlds. There's a lot of "seat of the pants dynos" but when you actually throw some stuff on a no kidding dyno, there's no gain and in some cases there's even a loss of performance. ...
Because a tuned pipe has such a dramatic effect on power from a 2 stroke most of the published knowledge is basically "how to make the pipe work", which makes sense. But without a pipe at all, much of the tricks and techniques are not relevant or even counter productive. Also, these are really WOT, constant (sorta) rpm engines. And then there is strato porting. It's different - get your had into it and have fun, it will be something new to learn.Ok, so being the OCD skeptic I am, the results of muffler mods all seem to be anecdotal. While I have heard some great sounding mods, the question remains: What's the proof other than the sound that they actually do anything? My experience is from the Motorcycle and Snowmobile worlds. There's a lot of "seat of the pants dynos" but when you actually throw some stuff on a no kidding dyno, there's no gain and in some cases there's even a loss of performance. From what I know about building two stroke exhausts there's a lot of physics and math involved that have been boiled down to things that work and things that don't. Simply drilling a hole or punching fins in the can that exists doesn't seem to follow the published knowledge of gaining power from a two stroke. Someone please explain...
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