Rode my new Pro today, first impressions...

[RockinMntKing]

sorry if this has already been said but this whole "cold shot" worry seems like a sham to me. Your gauge is reading COOLANT temp not ENGINE temp so when you start your sled and see the temp drop to 90, your seeing current engine coolant temp in the head (or wherever the sensor is), if the sled is already cooled down chances are that the thermostat is closed and that cold liquid is not entering the engine anyway. And on another note even if it was running 90 even 70 or 60 degree coolant into an engine that was at 125 when you shut it down, there is now way that this could ever cause ANY sort of mechanical issues in the engine. just my 2cents.

 

[theletup]

sorry if this has already been said but this whole "cold shot" worry seems like a sham to me. Your gauge is reading COOLANT temp not ENGINE temp so when you start your sled and see the temp drop to 90, your seeing current engine coolant temp in the head (or wherever the sensor is), if the sled is already cooled down chances are that the thermostat is closed and that cold liquid is not entering the engine anyway. And on another note even if it was running 90 even 70 or 60 degree coolant into an engine that was at 125 when you shut it down, there is now way that this could ever cause ANY sort of mechanical issues in the engine. just my 2cents.

I agree. I don't think it's the cold shot that you have to worry about. That's what your thermostat is for. That's why it is there. The thing that kills people is when they take off and hammer on the throttle when the engine is cooled down. Mechanical parts don't have a chance to warm up and expand and you get clearance issues. That's why the sled should be warmed up.

 

[barry1me]

This was a dilema for me when I was looking at the2012 163. Straight rails might not be for me as I love to wheelie. I'll keep my 2011pro for now as my buddy bought a 2012 163, so once he gets his sup set-up I will give it a whirl to see if I like the straight rails and how they handle.

The 2 reasons I like my 2011 163 tipped rails vs the 2012 was for the slight wheelie factor, and also less track on the ground for slightly better trail riding performance.

 

[600xc4me]

I also can't see the cold shot being a big deal really. Look at quads for example, we get them hot, then slam into a deep puddle riding with the engine completely underwater instantly super cooling the engine. And we do it over and over and over and over and over and over and so on. Lol And they never "cold seize". So I doubt that a slightly less hot shot of coolant is ever gonna hurt the engine.

 

[RKT]

sorry if this has already been said but this whole "cold shot" worry seems like a sham to me. Your gauge is reading COOLANT temp not ENGINE temp so when you start your sled and see the temp drop to 90, your seeing current engine coolant temp in the head (or wherever the sensor is), if the sled is already cooled down chances are that the thermostat is closed and that cold liquid is not entering the engine anyway. And on another note even if it was running 90 even 70 or 60 degree coolant into an engine that was at 125 when you shut it down, there is now way that this could ever cause ANY sort of mechanical issues in the engine. just my 2cents.

Well said,,,

Try building a fire in an igloo..... Is the fire output colder because it is in an igloo??? NOPE.. neither is your engine.. The engine temp is stabilized and the coolant is pulling heat from the engine AREA.. BUT the engine will run a nearly a constant temp once warmed up.. The coolant is getting hotter, the engine is not getting colder.. Yes, I know the laws of Physics.. But the heat is not coming from the "Critical Areas" that would cause any failure. There is absolutely no way the piston can cool down enough to cause any harm by some 90 degree coolant passing on the outside of the cylinder..

The cylinder periphery may be cooling down a TAD.. but the piston and cylinder INSIDE area is not getting "shocked" at all-->> nor is it rapidly dropping temperature. Water temp does NOT equal Engine Temp

I run my sleds at 70 degree water temp and would run them at 50 degrees if I could get them there..

 

[akgiauque]

Well said,,,
The cylinder periphery may be cooling down a TAD.. but the piston and cylinder INSIDE area is not getting "shocked" at all-->> nor is it rapidly dropping temperature. Water temp does NOT equal Engine Temp

I run my sleds at 70 degree water temp and would run them at 50 degrees if I could get them there..

I agree with what has been stated as to what the coolant is doing. It is pulling heat away from the cylinders to prevent high temperature damage. One counter point to consider is that by running an engine cooler you are not allowing the moving parts to operate at the optimal temperature. Older sleds could handle this because they used more oil. I fouled plugs in the 80's and early 90's all of the time but was running 32:1 or 40:1. But recently I can't remember the last plug I fouled on a sled nor do I know the exact ratio but I know they are running lean.
The temperature difference between the cylinder wall and the piston is primarily from friction. If it is to hot the parts melt, break, fail or all of the above. Rings and skirts most of the time go first but we do not get it shut down in time an other stuff often goes. If the engine is run to cold the piston and rings may be out of tolerance and you break parts as well. The 800 CFI burn down threads I have read were mostly attributed to poor tolerances and the piston rocking in the cylinder and skirts going, the fix no pun intended, is to install taller better fitting pistons.
If the optimal temperature is set to 125 by the manufacturer or his engineer through the thermostat control why would you want to run it at 90 or lower and risk breaking parts?

 

[bryce krueger]

not sure!!!

 

[gman086]

Well said,,,

Try building a fire in an igloo..... Is the fire output colder because it is in an igloo??? NOPE.. neither is your engine.. The engine temp is stabilized and the coolant is pulling heat from the engine AREA.. BUT the engine will run a nearly a constant temp once warmed up.. The coolant is getting hotter, the engine is not getting colder.. Yes, I know the laws of Physics.. But the heat is not coming from the "Critical Areas" that would cause any failure. There is absolutely no way the piston can cool down enough to cause any harm by some 90 degree coolant passing on the outside of the cylinder..

The cylinder periphery may be cooling down a TAD.. but the piston and cylinder INSIDE area is not getting "shocked" at all-->> nor is it rapidly dropping temperature. Water temp does NOT equal Engine Temp

I run my sleds at 70 degree water temp and would run them at 50 degrees if I could get them there..

AMEN TO THAT KELSEY!!!

Are you running without the t-stat in your Pros? I need to pull mine. As for the optimal temp thing... thanks for the laugh akg! That's the same BS they kept preaching to us on DooTalk and those of us in-the-know all deleted our stats and ran 10-15 deg cooler with NO issues and more performance. But hey, what do we know?

Have FUN!

G MAN