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Venture Lite Exhaust

B

Bugbear

Extreme
Joined
Dec 24, 2007
Messages
54
Location
Anchorage, Alaska
Here 's the result of an experiment I tried in order to limit the ice buildup and the exhaust reverberations in the tunnel. Results were fairly limited. Exhaust noise at idle is less and probably at cruise power too. Ice bulildup decreased somewhat but not as expected. Thought about filling the void between the black plastic and the deck at the top rear of the tunnel but didn't due to moisture entrapment concerns. Oh well, nothing ventured, nothing gained. Can't do much about clutch and track noise I guess. Molded ear plugs for me are next.
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Yamaha should just stop putting any exhaust under the tunnel.Only solution for you guys is going to be enclosing the whole tunnel between track and exhaust.
 
interesting comment cannondale when you see lots of posts about fellows building in tunnel exhausts and aftermarket in tunnel exhausts showing up in the market place, particularly the nitro and mountain sled crowd. I wonder what the solution is. I am going to try routing my venture mp exhaust outlet straight back to the end of the tunnel exiting above the snow flap. heavy build-up of snow and ice in the rear of the tunnel is my only serious complaint about the mp.
 
Well think about it.Us Phazer guys have had both.When holes were open and track driven snow hit exhaust we all had issues.Now with holes closed no more issues.

All the other sleds are halfway there.Either pipes or can or both still in the snow.They all still make ice.Phazer is only one totally out of the snow and no more ice.

If I had to I would totally enclose that tunnel between exhaust and track.Wrap the exhaust and add lots of holes on original tunnel or maybe even a fan to blow hot air from exhaust out of the now enclosed chamber.
 
I get your idea and have contemplated wrapping the exhaust from the header to the can to change the amount of heat in that section of the tunnel. I also thought about trying to shield that area. my concerns about closeing the exhaust in are as you mention - how does one get rid of the heat. I think if you close in the exhaust and open holes in the tunnel in that area you would have icing inside that cavity. pain in the a**. it would be nice to figure something out.
 
Yes its definitly not as easy to do on yours as it is a Phazer.Enough shielding might do the trick.Maybe wrap whole thing with the header wrap and then aluminum sheeting.Maybe even more than one layer.On the enclosing idea I dont think ice in that cavity would be a huge issue since not much snow would ever get in there.Maybe even put screen over any venting holes to keep leaves and other stuff out like mouse nests.On the Phazers with front blocked off I have noticed alot of leaves and grass gets up in there and then could burn.Not good.
 
Bugbear said:
Here 's the result of an experiment I tried in order to limit the ice buildup and the exhaust reverberations in the tunnel. Results were fairly limited. Exhaust noise at idle is less and probably at cruise power too. Ice bulildup decreased somewhat but not as expected. Thought about filling the void between the black plastic and the deck at the top rear of the tunnel but didn't due to moisture entrapment concerns. Oh well, nothing ventured, nothing gained. Can't do much about clutch and track noise I guess. Molded ear plugs for me are next.
quote]

Thanks for bringing this issue back to life. It was a big deal on here last year with a post called "Ice Boogers" with some great pics. That is some serious icing you got there even with your extension - it must be the cold weather in Alaska! So it was worse w/o the extension? This problem is much worse in cold conditions but that is no consolation. It is something that Yamaha should fix but they just continue to ignore this issue. Yesterday I was on a long (360km) trip and had to keep knocking the ice off and by the time I stopped for supper the ice was pretty well down to the ground on both sides. My biggest concern with this is the premature wear that is being caused on the track by continuously rubbing on the ice. BTW, I think this icing problem is one of the reasons why the resale value on these is so ridicuously low!
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After two 50+ mile rides, with temps around +15 F the results are the same. Notice less ice on the right side of the tail pipe. That's the only gain. I expect KARL to gain more with his mod if he shields the left side of his straight tailpipe. Seems to me that shielding a straight tailpipe completely is the way to go absent a radical system modification. The problem is solvable. The question is, what's practical?
 
I've seen one with the tailpipe exiting the rear of the sled below the rack, straight out. It was supposed to help but that is an awful lot of heat under there. Its a dumb design but there is nowhere else to run it unless you have a high seat like a phazer and no rack on the rear. Maybe some big rig style pipes like this rustang.
 
venture mp exhaust

After having the pipe around since last season I finally took the time today to proto the straight out the back exhaust I have been planning. I took it out for a short little blast but not long enough to make any judgments about whether it is an improvement. the sled sounds a bit different. I will take some more pictures after a longer ride to show whether it has helped.
 

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Re: venture mp exhaust

karl said:
After having the pipe around since last season I finally took the time today to proto the straight out the back exhaust I have been planning. I took it out for a short little blast but not long enough to make any judgments about whether it is an improvement. the sled sounds a bit different. I will take some more pictures after a longer ride to show whether it has helped.
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How does it sound different? Quieter, louder or just a different sound?

Also, might the tailpipe melt the plastic piece that you have cut away there?

Let us know how it proves out.

Thanks
 
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