• We are no longer supporting TapaTalk as a mobile app for our sites. The TapaTalk App has many issues with speed on our server as well as security holes that leave us vulnerable to attacks and spammers.

Venture Lite Exhaust

Hey Bomba, had it out for about an hour with alot of short full throttle periods - no melt yet. snow seemed to keep it cool. might be different in warmer or low snow conditions. If it works I will probably use some alum sheet in the tunnel from the rear up to the can like some of the nytro guys are doing so would remove the plastic completely. The sound is just a bit deeper as it is not muffled by the tunnel and snow in the tunnel. check out the nytro link. although their exhaust outlets are above the tunnel, the can and header are in the tunnel not unlike the venture lite, maybe not quite the same tunnel exposure as the cans on the ventures. ;)!
 

well...I was out riding a bit today and I think the exhaust straight out the back is a big improvement in build-up of snow and ice in the tunnel. it was pretty warm so it may take next season to see how it works in colder weather. for now I am happy I went this direction. I didn't have a camera with me so unfortunately no pictures. :-o
 
I can kinda rationalize why your mod is as effective as it seems to be.
Still wonder if the left side needs shielding as it's closer to cold structure. Thumbnail engineering or by guess and by golly engineering. I love it!
If next year it proves out in colder temps I'll follow suit. May do it before.
If Yamaha would come up with an inverted dry sump engine like some older aircaraft engines, the exhaust would be on the bottom and could run straight down or back underneath. There's a thought.
 
What do ya say bugbear, maybe we get jobs with Yamaha designing exhausts.... I will probably wrap the pipe with header tape and maybe throw a thin aluminum or stainless wrap out side the header tape. some of the nytro guys have been sheeting in the tunnel under the exhaust, sounds like an idea. I may also try that. from the back of the tunnel to just ahead of the can. well...some times I think I like tinkering as much as riding - lol. good thing we still have a month of riding left cause I've been tinkering enough already. :Rockon:
 
Yeah karl, you're on the right track. I was surprised that the hose clamp ends were bent up on my experiment. Hadn't thought about the force of the snow thrown up. That header wrap is the way to go with something to protect it. I do wonder about corrosion beneath the wrap tho.
 
corrosion would definately be an issue. If my prototype works like I hope I was considering ordering some stainless exhaust tubing for a more permenant installation. mild steel actually looses density (read - deteriorates) fairly rapidly just from heat when wrapped with header tape, where stainless actually gains in density - A tidbit I found while researching the efficiency of header tape. the rest of the exhaust system is all stainless. :-o
 
Rode yesterday in sunshine and fairly mild temps. Same old ice buildup in the tunnel when I checked on the hill. Loading up the temp was above freezing and buildup was slush falling out. After considering your thoughts karl my plan now is to go straight back next fall with stainless and no wrap but to add a .040" diaphram of 2024T3 aluminum sheet using 1/2" thick pieces of UHDM plastic as stand offs between the tunnel sides and the side supports for the diaphram. All subject to change of course ;)! Since stainless does't transfer heat efficiently like mild steel, I'm thinking I can get away without heat wrap that far back. Don't know tho.
 
I think you are on the right track Bugbear, although it is too bad we have to mod these sleds so much. take pictures of what you build. how far forward do you think you will take the diaphram? some of the nytro guys are covering their cans in the same fashion. seems that enclosing the whole exhaust all the way forward with a diaphram retains too much heat. :o|
 
Ya know karl, I'm inclined to locate the diaphram only as far forward as the rear of the muffler. Thinking about the kind of riding I do, mostly trail, and the extra hassle involved because of accessability on each side of the muffler, I'll keep it simple; the KISS method. Will use nutplates on the inboard side in lieu of nuts. About 3 or 4 3/16 inch fasteners on each side oughta do it, maybe two in the rear. Was thinking I'd scrounge a pice of Corian plastic to clean up the hole I'd cut in the rear bulkhead. Just preliminary thoughts. I'm Summerizing the machine now. Preservative oil and all. Had enough 'til Fall.
 
Bugbear said:
Ya know karl, I'm inclined to locate the diaphram only as far forward as the rear of the muffler. Thinking about the kind of riding I do, mostly trail, and the extra hassle involved because of accessability on each side of the muffler, I'll keep it simple; the KISS method. Will use nutplates on the inboard side in lieu of nuts. About 3 or 4 3/16 inch fasteners on each side oughta do it, maybe two in the rear. Was thinking I'd scrounge a pice of Corian plastic to clean up the hole I'd cut in the rear bulkhead. Just preliminary thoughts. I'm Summerizing the machine now. Preservative oil and all. Had enough 'til Fall.
Click to expand...

Giving up already in Alaska - you must still have snow?

Trying to get a picture of you idea; so you are going to install a tail pipe extension and enclose it up to the back end of the muffler? If the muffler is left exposed, won't you still get snow melt and ice build up from the hot muffler? And, why is heat build-up such a concern if the muffler is enclosed, since most machines have their mufflers right next to the engine? I don't know, just thinking out loud!

Thanks, and enjoy your summer!
 
Trying to get a picture of you idea; so you are going to install a tail pipe extension and enclose it up to the back end of the muffler?

Yeah, you got it Bomba. With time and money we can do anything; right?
Well, I got limited time and money so I'm going to be happy with limited results. Was smiling this morning about the transition of Yamaha engineers from sociopaths to talented individuals after Cannondale and others enlightened me about some of the aspects of this machine. Ya gotta admit that it works the way it is. I would guess that the Yamaha bean counters (accountants) had to stop the engineers somewhere and the exhaust system was part of it. 'Nuff rambling.
 

Attachments

  • 100_6375.JPG
    100_6375.JPG
    89.1 KB · Views: 201
  • 100_6377.JPG
    100_6377.JPG
    114 KB · Views: 205
  • 100_6380.JPG
    100_6380.JPG
    102.6 KB · Views: 194
well...we still have a month of trailering to the mountains around Whitehorse and we will have lake ice until mid May, so I will keep riding. we use our sleds to access Paragliding sites early in the spring. Not so good riding straight from the house as the snow is getting really soft and wet during the day and my 2" track really tears up the muddy driveway.

I will probably try a similar idea to yours Bugbear but may run the diaphram to just ahead of the can - lots of fit up around the drop brackets though to make it a clean install. I probably wont start on that project until fall. Have a great summer and we will look at this with fresh eyes after a bit of a break. :Rockon:
 
Bugbear said:
Trying to get a picture of you idea; so you are going to install a tail pipe extension and enclose it up to the back end of the muffler?

Yeah, you got it Bomba. With time and money we can do anything; right?
Well, I got limited time and money so I'm going to be happy with limited results. Was smiling this morning about the transition of Yamaha engineers from sociopaths to talented individuals after Cannondale and others enlightened me about some of the aspects of this machine. Ya gotta admit that it works the way it is. I would guess that the Yamaha bean counters (accountants) had to stop the engineers somewhere and the exhaust system was part of it. 'Nuff rambling.
Click to expand...

Well, I have to disagree to a point, I think it is Yamaha (VL) owners who have to transition to talented individuals. I have owned snowmobiles since 1977 and have never had anything that required modifications like this (unresolved reverse issues, upgraded balljoints, better bushings, better skis, exhaust whatever, etc). But I guess "necessity is the Mother of invention" and all these creative juices and tinkering have to be good for the old brain cells.

All the best, asnd keep us posted,
 
Plenty of riding left here in southcentral Alaska. Most of the trail riding done from Anchorage is a hour and a half to three hours away. Makes for a long day. But break up has started with these long days and lots of sunshine we get at 61 degrees N latitude. Same as Oslo, Norway. I haven't really taken a serious look at the problem. Just a cursory look and ramdom thoughts. Will tackle it first thing at oil/filter change in the Fall. Have a great summer!
 
You must log in or register to reply here.


Back
Top