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Discussion Starter · #1 ·
I know it's probably too early to tell, but I wonder if the front cooler is really needed at all on the 600HO? I can see it doing it's magic when running down a trail/road with no loose snow. But that is an instant 8lb drop to pull the thing out of there.
 

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Originally posted by XtremeXC@Sep 21 2005, 09:57 PM
I know it's probably too early to tell, but I wonder if the front cooler is really needed at all on the 600HO? I can see it doing it's magic when running down a trail/road with no loose snow. But that is an instant 8lb drop to pull the thing out of there.
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I am guessing you mean the radiator, as opposed to the center cooler mounted in front of the track. You can rest assured if it was not beneficial under some conditions, Polaris would have saved the money, and the weight.

I rode in a lot of 0F conditions last season and when the trails had melted down and refrozen even a studded track, did not leave enough chips to cool the sled down on my 05 600 50th Touring. I would have gladly added a radiator, it would have solved the problem if it was plumbed properly.
 

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Discussion Starter · #3 ·
Yes I meant the front radiator. I kinda wonder just how much extra it actually cools. Has anybody here with a 900 removed there's and rode last season? If so did you notice any difference in temp in low snow conditions?
 

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On warm days on refrozen trails at "slow" speeds it helps.
My ZR900 has gotten hot even with studs. We were "trapped"
along side a road frozen hard on a warm morning following
a very "slow" group. The ice hadnt started to melt yet.
The eight pounds would have been nice that day. I ride in
two states and many locations so I never know what I
will run into. Even the 600s were hot.
 

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Guys, on the 600HO the radiator is only for warmup. Once the thermostat opens the radiator is completly bypassed. It is just dead weight during normal operation.
 

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Originally posted by cmscat50@Sep 22 2005, 01:50 PM
Guys, on the 600HO the radiator is only for warmup.  Once the thermostat opens the radiator is completly bypassed.  It is just dead weight during normal operation.
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no when the engine gets to a certain temp then the radiator is used . i ran my fuse on bare ice a couple of runs like a.5-.75 mile each way and it never ran over 125 to 128 on the temp gauge. i beleive there is some kinda thermostat that opens when the engine gets to a certain temp
 

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and why would u need a radiator for warmup its for cooling.
 

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Originally posted by cmscat50@Sep 22 2005, 02:50 PM
Guys, on the 600HO the radiator is only for warmup.  Once the thermostat opens the radiator is completly bypassed.  It is just dead weight during normal operation.
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???????????? :celebrating:
 

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if thats the case wouldnt it take the sled all day to warm up? I thought the job of the thermostat was to keep the coolent from going to any type of cool down device until it reached a certain temp?
 

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i would leave the radiator alone.........the first time you go down a frozen trail,ie.,no loose snow,watch the temp. gauge go up.............you will be glad you left it alone.......trust me........my 05 fusion would run normal 125 deg. but when there was no loose snow it would go up to 160 - 195 depending on the conditions........ :i_need_snow: :div20:
 

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Originally posted by cmscat50@Sep 22 2005, 01:50 PM
Guys, on the 600HO the radiator is only for warmup.  Once the thermostat opens the radiator is completly bypassed.  It is just dead weight during normal operation.
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Wrong Answer.

When Polaris went with the Dual Loop cooling system a few years ago, they went from a bypass type thermostat, to a two stage cooling system. They also increased the size of the 'bypass' outlet in the head, because it is really no longer a bypass circuit. It is a 3/4" NPT thread that goes to a 1" hose.

Some of their diagrams still use the 'bypass' terminology, but that is misleading.

on the 600 HO Fusion, the first stage, always flowing loop has got the radiator only. When the machine is sitting still, this will allow the motor to warm up even in very cold weather. When the thermostat opens up, the front bulkhead, running board and tail exchanger are in the second stage loop.
 

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Originally posted by ExcursionPSD@Sep 22 2005, 10:14 PM
Wrong Answer.

When Polaris went with the Dual Loop cooling system a few years ago, they went from a bypass type thermostat, to a two stage cooling system.  They also  increased the size of the 'bypass' outlet in the head, because it is really no longer a bypass circuit.  It is a 3/4" NPT thread that goes to a 1" hose.

Some of their diagrams still use the 'bypass' terminology, but that is misleading.

on the 600 HO Fusion, the first stage, always flowing loop has got the radiator only.  When the machine is sitting still, this will allow the motor to warm up even in very cold weather.  When the thermostat opens up, the front bulkhead, running board and tail exchanger are in the second stage loop.
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According to Dynotech Reasearch, once the T-stat opens the radiator is bypassed. I guess we'll have to start an investigation fo this. It may be different than the 900 Fusion
 

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Originally posted by cmscat50@Sep 22 2005, 01:50 PM
Guys, on the 600HO the radiator is only for warmup.  Once the thermostat opens the radiator is completly bypassed.  It is just dead weight during normal operation.
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cms is right, with the motor cool it runs through the rad, when the thermostat opens it is diverted to the rear cooler. Just a tiny bit makes it through to the rad but not enough to help cool anything. There will be kits to remove the front radiators on both the 600 Fus and RMK made available soon.
 

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Why not just tie the rad. and the coolers in a series and forget the dual stage T-stat. The 600 always ran hot anyway.
 

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Discussion Starter · #16 ·
Originally posted by bulldogger@Sep 23 2005, 12:07 PM
cms is right, with the motor cool it runs through the rad, when the thermostat opens it is diverted to the rear cooler. Just a tiny bit makes it through to the rad but not enough to help cool anything. There will be kits to remove the front radiators on both the 600 Fus and RMK made available soon.
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Really? Hard to believe that they would even bother running fluid through anything other than recirculating around the motor for warm up? Not disagreeing, but it just dosn't make sense. If that was the case why have a radiator and vents up front? Why not just have a separate exchanger for that? Anyway, my guess is that it is no different than the '05 Fuse where the front radiator only opens up and is used when coolant get's to a certain temp due to lack of snow to properly cool the exchangers.
 

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Thanks for believing me guys :doh:

I only deal in facts. :cn:

:dance2:

Sounds like it's time to buy radiator delete kits for the 600's.
 

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Originally posted by cmscat50@Sep 23 2005, 02:34 PM
Thanks for believing me guys :doh:

I only deal in facts.  :cn:

:dance2:

Sounds like it's time to buy radiator delete kits for the 600's.
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Where is DTR's data on how the system works? Polaris9500 is 100% correct. Just look at the hose routing, look at the stat and then accept that you are not correct. Sorry, just stating the facts. :fluffy:
 

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awwwwwwww cmon. I really have no idea....just stating what Jim stated.

I will not copy / paste any info directly from Jim's site. How is he supposed to sell memberships if everything is copied to other free sites? Membership is less than a gallon of oil.
 
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