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Silencing the Can


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#31 ZaHaDoo

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Posted 11 January 2015 - 10:31 PM

LRD knows his stuff and seems every year he is able to put stuff in an understandable form. Do an internet search for Gordon Jennings Two-Stroke Tuner's handbook if you want a good mathematical/engineering write up on tuned exhausts.



#32 Daag44

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Posted 11 January 2015 - 11:35 PM

LRD knows his stuff and seems every year he is able to put stuff in an understandable form. Do an internet search for Gordon Jennings Two-Stroke Tuner's handbook if you want a good mathematical/engineering write up on tuned exhausts.

 

I appreciate the heads-up and the courtesy for sending me in the right direction.


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#33 freerider14

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Posted 11 January 2015 - 11:47 PM

I would post the can on craigslist for trade for stock can, some 16 year old will grab it in no time!!


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#34 MinnDave

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Posted 12 January 2015 - 12:10 AM

I would post the can on craigslist for trade for stock can, some 16 year old will grab it in no time!!


Yep and that 16 year old will grow up to be a total can head and annoy land owners and you know the rest.

Put that biatch can in the trash can and forget about it.

Edited by MinnDave, 12 January 2015 - 12:11 AM.


#35 LRD

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Posted 12 January 2015 - 09:19 AM

LRD knows his stuff and seems every year he is able to put stuff in an understandable form. Do an internet search for Gordon Jennings Two-Stroke Tuner's handbook if you want a good mathematical/engineering write up on tuned exhausts.

When I put a 617 rotax in my Phazer in the early 90's and made a pipe and silencer I think Gordon Jennings book was likely one of the few places I could find any info drawings etc on 2 stroke silencers.  The can I built was rather small, and as I remember I had two ideas in it, straight through glass pack on first half and then into chamber reversing directions to outlet.  Don't remember exactly how I did it, will look through all my engine files and see if I still have any of my design drawings for it.  Engine dynoed about 120 HP, I don't remember it being obnoxious loud.  The Phazer front end was about as tight as a XP, think my primary clutch bolt rubbed on the side panel a little.



#36 Freestylin'

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Posted 12 January 2015 - 12:17 PM

Thanks for all the input LRD. To those of you who are telling me to "can" the can you're kinda missing the point--I think there should be a compromise where you can get some of the lightweight benefits of the can without the huge increase in noise or loss of power. I'm not saying BRP doesn't know what they are doing, I'm just saying there's gotta be a different way to get similar results.


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#37 MinnDave

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Posted 12 January 2015 - 12:28 PM

Thanks for all the input LRD. To those of you who are telling me to "can" the can you're kinda missing the point--I think there should be a compromise where you can get some of the lightweight benefits of the can without the huge increase in noise or loss of power. I'm not saying BRP doesn't know what they are doing, I'm just saying there's gotta be a different way to get similar results.

You sound like a reasonable guy. Is the savings in weight more important than the future regulation of the sport? 

 

This is called, "Throwing the baby out with the bathwater." 



#38 kidinloghouse

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Posted 12 January 2015 - 12:36 PM

I'd really watch the pipe temps. years ago specialty sleds was welding small collars into the bottom of the mbrp cans to increase backpressure to get around the loss of power. and they would increase the egts significantly. okay for a drag race but no good on the lake


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#39 Freestylin'

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Posted 12 January 2015 - 02:03 PM

You sound like a reasonable guy. Is the savings in weight more important than the future regulation of the sport? 

 

This is called, "Throwing the baby out with the bathwater." 

 

I'm confused. If the decibel levels are the same, then what difference does it make? If there's a way to improve upon BRP's weight without breaking the decibel laws, what's the issue?


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#40 YooperWoods

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Posted 12 January 2015 - 05:40 PM

I'm confused. If the decibel levels are the same, then what difference does it make? If there's a way to improve upon BRP's weight without breaking the decibel laws, what's the issue?

There is no issue and I think this is a great thread and good technical discussion.  Hope the haters don't ruin it and get it locked. 

 

Not all of us ride where noise is a factor.  The areas I ride are so remote there isn't a residence within 15 miles in any direction, and some areas more than that.  We rode saturday in 2' of fresh pow and a couple guys went from the first ridge out to the second.  We couldn't hear them at all, in fact didn't know where they were and these were relatively loud sleds. 

 

I have a can on mine mostly because I bought it that way, but I do like the weight savings and if I can quiet it down I'm all for that so kudos for making the effort.  I truly hope this experiment works out because I'll give it a shot also.


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#41 MinnDave

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Posted 12 January 2015 - 06:05 PM

I'm confused. If the decibel levels are the same, then what difference does it make? If there's a way to improve upon BRP's weight without breaking the decibel laws, what's the issue?

Are you saying that you have the equipment to test the decibel requirements?

I have not read every post here. Was it already mentioned here?

 

The weight reduction theme just sounds like a smoke screen to me, especially for trail sleds.

 

In the end, when the general public is whining incessantly at public hearings, and more and more trails close,  and the clubs... tired of rerouting trails give up and walk away, then the  "can" riders will hopefully stand up and take a bow.

 

My hope is that a enough young riders will start to figure it out. The snowball has already started  rolling down the mountain side. 



#42 Freestylin'

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Posted 12 January 2015 - 07:16 PM

I believe my former boss has a decibel meter that I can borrow, but before I take the time to do that I want to make sure the sled will actually run well with the baffle in place. I got the mounting holes for it drilled but I am also partway through installing my clutch kit on my sled so it may take a brief backseat to tuning without the baffle.


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#43 gene p

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Posted 12 January 2015 - 07:29 PM

I believe my former boss has a decibel meter that I can borrow,

 

 If you have a smartphone you can download an app .

 

Yeah , there's an app for that  :laugh_old:



#44 Freestylin'

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Posted 12 January 2015 - 07:55 PM

Nah no smart phone here!


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#45 199Mods

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Posted 12 January 2015 - 08:13 PM

The other benefit of a can is access to the track. It sucks pulling the stocker out just to change drivers or track. Something I do regularly.

My stock suitcase makes a nice rumble but with sleds weight service and performance being a huge factor for fun I LIKE THIS THREAD!

Its funny that the people being helpful and the people who just read can and posted something angry both love snowmobiles.

If you can haters had read ANY of FREESTYLIN' other posts he sets his sled up for off trail and is trying to accommodate people who's trail he has to ride so he is able to ride off trail and have FUN without upsetting anyone.

LETS change the conversation to a intelligent intellectual technical light hearted one.

This is no different than someone asking for help to make their sled more reliable after they first buy it.

Keep forging the way I have a mbrp can I would like to make trail suitable.

Andrew
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