Tunnel Extension Cooling

S

snomoguy

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Read some threads that some guys are using longer tracks without installing tunnel extensions and moving the rear cooler back. What issues of concern could develop without moving the cooler back. Looks to me that cooling would be better if (not) moved back, due to the cooler being closer to track and more snow coming into contact with it, or is it that it is inhibited from air flow? Can't really see where a longer track making a difference.
What am I not thinking about. :letitsnow :letitsnow
 
coolers

MMax coolers are flush to the tunnel dropping down 1 1/2 " . SXr coolers sit 90 Degrees to the tunnel dropping down 4" SRX coolers drop down 6" but offer the best cooling OEM rear Exchanger. Just track clearance is the issue. A tipped up rear extension is another option but I think your right, where to cool forward or back isn't the issue but clearance is.
 
The Mountain Vector has the rear cooler positioned about where it would be if it was a short track, the last 10" of the tunnel is clear. I would have to say it is more of a clearance issue. Although some sleds with the rear flap removed will not cool properly so maybe the farther back the better.
 
Wow, loneviper
Didn't realize that was the case on the vector!

I guess I can't see why a guy would have to add the extension to the tunnel and move the cooler back just going from 144 to 151.
What is the added lenght (how much is the track moved back) on the ground going from 144 to 151, can't be over 3-4", is it.
Guess that is what I am trying to research, Does the cooler have to be moved back for any reason I am not considering.
If the vector is not at the back of the tunnel, then there can't be a cooling issue. Is the vector rear cooler alot like the mt. viper cooler.......small and round? :letitsnow :letitsnow
 
I think it would be real close. The Hartman 151 extension is a couple of inches longer than the stock 144 extension. There may be rear intereference on full compression. My bud has a 151 viper so I can take some measurements the next time we all get together. I think the rail extensions were about 3.5" or so long....
 
The Vector rear cooler is flat, the width of the tunnel and about 6" long. I think the real issue is, will it clear the rear of the sled when the suspension is compressed. Yes, then you should be good to go with out an extension.

There where a few guys around here who extended Exciters from 121" to 136" with no problems at all except for the rear flap.
 
I Added A 136" Extension Kit To My 2002 Srx From Mountain Performance (i Highly Reccomend This Kit By The Way) And It Came With A Simple Crossover Aluminum Tube And It Works Well, Have Had No Issues With Running Hot At All, Mountain Performance Says That The Rear Cooler Being Replaced By A Tube Is The Way To Go Due To The Fact That It Increases Coolant Flow And Is Better For Cooling...
 
I added a 136" kit from Hartman to my '00 Vmax 700 and it only has the crossover tube vs. the stock small cooler. Last weekend in mid 20's F, the temp light would flash until I got in some loose stuff.
This weekend I am putting the stock cooler back in but instead of it being mounted vertical above the rear flap on a stock tunnel, it will be horizontal on top of the tunnel at the rear of the extension so hopefully it will be enough of a difference? I had to have the tubes cut and re-welded 90 degrees from stock to make it work.
It will probably be hard to tell for sure this weekend as it will on be highs in the single digits, if I am lucky, ha!
 
I installed a RX1 Mountain cooler in my 144" SRX. So far so good. These coolers are huge. It looks like there is a potential for track to cooler contact though. I am going to add some skid drop down brackets to cure this.
 
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