I agree that it does take out less heat from the engine, so that helps - but for something in such cold environments, keep in mind that the freezing point is at 10°F. Be careful! See attached plot.
Thermo -Bob Testing and results - Excellent
- Thread starter mtn-doo
- Start date
I agree that it does take out less heat from the engine, so that helps - but for something in such cold environments, keep in mind that the freezing point is at 10°F. Be careful! See attached plot.
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DieselTwitch
Well-known member
Last edited:
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Adobe-Al
Well-known member
Should have mentioned, propylene glycol not ethylene glycol. I'm good down to -75*F
Diesel- good idea! are your rads blocked? and I take your not running a t-stat with this set-up. Did it lower the boiling pt?
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DieselTwitch
Well-known member
No blocked rads, no t-stat either. It lowered it slightly im sure but with the system under pressure im sure its some where around 220*F not much data on pure glycol
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DieselTwitch
Well-known member
I take that back Propylene GLycol has a boiling point of 370*F.
The reason I believe it works as well as it does is it lowers the efficiency of the cooling system by 30%
The reason I believe it works as well as it does is it lowers the efficiency of the cooling system by 30%
Hello Watt-man I must be the guy in this quote, Marc V
2013 KTM 450 SX Thermo-Bob Fitment
Attached is a pic of thermo-bob on 450 sx with Napa 8550 hose.
![IMG_1333[1].jpg](https://www.snowest.com/forum/data/attachments/186/186193-acf2c6ead859196749e04a4ecc5115fa.jpg?hash=rPLG6thZGW "IMG_1333[1].jpg")
Attached is a pic of thermo-bob on 450 sx with Napa 8550 hose.
Thermobob not stopping coolant
On 450SX, coolant is warming immediately after startup. Wasn't a problem late last year in the warmer weather. Now trying to make it work right. In a pot on the kitchen stove it seems to open and close correctly. When I took it apart I was hoping to see small bypass holes that some have said needed plugged. No holes. Does the KTM 450SX build enough coolant pressure at the thermostat to open it prematurely? Help please!
On 450SX, coolant is warming immediately after startup. Wasn't a problem late last year in the warmer weather. Now trying to make it work right. In a pot on the kitchen stove it seems to open and close correctly. When I took it apart I was hoping to see small bypass holes that some have said needed plugged. No holes. Does the KTM 450SX build enough coolant pressure at the thermostat to open it prematurely? Help please!
Is the sensor in the bypass line? Looks like it. The avids show immediate temp rise all the way to 200 degrees then u see thermo open and temps drop
Temperature Probe
Yes, temp probe is in the brass bypass T. Temps rise constantly to 190 where fan is set to come on. Radiators should not warm immediately. Maybe the crude metal to metal seal in closed position is leaking a little coolant to the radiators?
Yes, temp probe is in the brass bypass T. Temps rise constantly to 190 where fan is set to come on. Radiators should not warm immediately. Maybe the crude metal to metal seal in closed position is leaking a little coolant to the radiators?
Any updates on an install in a 2010 KX 450? I was told that there wasn't an exact install guide for that bike, and that the hoses needed to be cut. I have a thermobob that I bought less than a month ago, but it's not a precision fit I've been told. haven't had time to install it yet.
I haven't heard any leaking issues with just clamping down the 7/8" hose on the 3/4" barb on the Thermo-Bob, but I think the most professional thing for me to do will be to include a short section of 7/8" to 3/4" hose reducer with every KX450F kit. All kits that ship after today will have one, and the price will not change.
Wakeandsnow, if you'd like me to mail one to you a reducer, send me an e-mail at watt-man at cox dot net.
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mtn-doo
Well-known member
No, the Stat opens toward the incoming pressure. Pressure won't open the stat. The bypass prevents excess pressure. No leak ports needed in the Stat. You're good.
Thermobob
Watt-Man sent me another 180 thermostat. In the shop it seams to seal better now. Radiators still get warm before thermostat opens, must be from warm coolant convecting up the bottom two radiator hoses. Great service, thanks Watt-man.
Watt-Man sent me another 180 thermostat. In the shop it seams to seal better now. Radiators still get warm before thermostat opens, must be from warm coolant convecting up the bottom two radiator hoses. Great service, thanks Watt-man.
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