new muffler

[forgues research]

Here is a new muffler/cannister I'm working on to be a cross between incowl and canister.

Any constructive comments would be appreciated.

Thank you,
Roger

[Dangerous Dan]

What does the inside of a Canister look like?

[Dangerous Dan]

Also You should Make a CF Cannister! If you could make one that saved 1/2 pound over a standard Cannister and work well they would sell like hotcakes!!

[dick hanson]

	Quote: Originally Posted by forgues research
	Here is a new muffler/cannister I'm working on to be a cross between incowl and canister. Any constructive comments would be appreciated. Thank you, Roger

Having been down this road -- the BEST you can hope for is to loose no power over open stack readings -
the design is fine .
the Achillies Heel is that guys will take the smaller ones and attach em to engines really needing large ones
or add a long header to make installation easier .
Some time spent burning your fingers and recording outputs on a lot of props will get the "best" combos sorted out .

The hard part?
coming up with headers for all the various installations . When I did my PIP tuned can setup for ST140s etc., I got thru all the design and development and THEN- the manufacturing guy crapped out on me -
Hope you have a better experience.

[forgues research]

Thanks guys for all your responses,

At this stage, I'm not trying to make a muffler for resale purpose, it is mostly for me.

The drawing with Solid works shows pretty well what the inside of it is.

I am not trying to make a tuned muffler for more power, but not to lose power is good for me.

Also this design is more for simplicity so it will not be the most quiet compared to the previous one I had made.

Dick,
With the one you see in the first post, do you think the lenght of the header is a big issue??

This one I'm making is for a EVO 150

Again thank you for all your comments and the more the merrier as its a learning curve for me.

Also to add, I have not tested the CF yet for any heat problems but will soon

if this works then the next one might be with carbon fiber.

This is the one I previously made and with the aluminum outer skin which I tested, was no lost of power at all and very quiet .

Roger

[forgues research]

	Quote: Originally Posted by Dangerous Dan
	Also You should Make a CF Cannister! If you could make one that saved 1/2 pound over a standard Cannister and work well they would sell like hotcakes!!

yes you are right, but here is the biggest problem

There is a lot of misinformation about carbon fiber. The only reason carbon fiber is light is because you use very little of it compared to other materials.

For instance , two identical pieces of Fiberglass or carbon fiber will weigh just about the same.

A well made aluminum muffler will weigh not much more then a carbon fiber .

with gassers, only the outer skin is carbon fiber, so the gain is not that much and much more expensive, and yes it has that bling bling but its burried inside the fuse...

Roger

[Dangerous Dan]

Good Points I know Tony at Dalton used to sell some but don't know the details

[dick hanson]

[quote=forgues research;269485]yes you are right, but here is the biggest problem

There is a lot of misinformation about carbon fiber. The only reason carbon fiber is light is because you use very little of it compared to other materials.

Carbon parts are light because done properly they have a low resin to fibre ratio- much lower than we see with typical fibreglas model aircraft fuselages
The process is typically done under very high vacuum and elevated temps as the actual strength is from complete wetting around each fibre (glueing em to each other ) and the curing temp for specific resin is very important
Carbon fibre does not absorb like cotton.
Heat transfer of complete tuned pipes from carbon fibre is a surprise to first time users as the pipes stay much cooler to the touch ( low thermal transfer.) Noise transfer is also different .
The fascination with a CF look is really strange - A friend has a Porsche which has all carbon fibre interior trim - very pretty but of no practical purpose whatsoever.

[dick hanson]

Dick,
With the one you see in the first post, do you think the lenght of the header is a big issue??

Roger[/quote]
only problem is that increased length simply increases pressure in header and that will slightly reduce power - Ideally the length and size of this design effectively kills any sonic wave forming which can act on the exhaust .
the low but NOT absent back pressure keeps the idle usable and the short path into low pressure permits exhaust flow with least restrictions as the rpm increases. this is where volume really counts
The so called stock in cowl stuf restricts flow out and so - flow in is reduced . an ideal muffler would consantly change volume - nice idea but hardly workable.

[forgues research]

Thanks Dick, your points well taken.

here is a bit of update on the drawing board ... but it might not get built, just looking at what can be done.


Roger