cooling system question
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Senior Member
SuperBike
Joined: Oct 2008
Posts: 1,033
cooling system question
SO I just realized my bike is missing the entire thermostat housing. Im re doing my entire cooling system anyway so im wondering what adverse effects ill have by not running a thermostat.
I know it will take longer for the bike to fully warm up since the coolant is always flowing.
Ill be running 1 radiator under the tail of the bike instead of the stock dual side mount. The rad will have 2 86 cfm fans to handle the cooling duties. The fans will be hooked up to a 3 position switch. The 3 positions are OFF, automatic(electric thermostat controlled), and manual ON.
SO, what do you think?
I know it will take longer for the bike to fully warm up since the coolant is always flowing.
Ill be running 1 radiator under the tail of the bike instead of the stock dual side mount. The rad will have 2 86 cfm fans to handle the cooling duties. The fans will be hooked up to a 3 position switch. The 3 positions are OFF, automatic(electric thermostat controlled), and manual ON.
SO, what do you think?
Senior Member
MotoGP
Joined: Mar 2007
Posts: 3,132
From: Phoenix, AZ
Senior Member
SuperSport
Joined: Jun 2005
Posts: 524
So what do I think ?
Oh Yeah, another one.
I would run the thermostat, it'll provide more consistent cooling temps.
I don't know what the cfm rating is on the stock VTR pusher fans, but I'm running two.
They are both thermostatically controlled.
The first fan, which has an adjustable switch, cycles between 207 and 203.
The second fan cycles between 208 and 194 deg F and is switched by the original fan switch.
When the thermal load causes the temp to stay above 208 deg F, the second fan kicks in.
I'm going on three years running the underseat radiator, the last two years with two fans.
I only had an issue with almost overheating the first year when only running one fan.
(chasing a buddy in 100 deg temps at 100 plus speeds through central California on the way back from Laguna Seca)
Since I've gone to the two fan set-up the bikes runs cooler than an RC51 or VTR.
Also be aware that riding in the rain, the water coming off the rear tire, even with a hugger, water cools the radiator and the thermostat never fully opens.
Go for it.
Kai Ju
I would run the thermostat, it'll provide more consistent cooling temps.
I don't know what the cfm rating is on the stock VTR pusher fans, but I'm running two.
They are both thermostatically controlled.
The first fan, which has an adjustable switch, cycles between 207 and 203.
The second fan cycles between 208 and 194 deg F and is switched by the original fan switch.
When the thermal load causes the temp to stay above 208 deg F, the second fan kicks in.
I'm going on three years running the underseat radiator, the last two years with two fans.
I only had an issue with almost overheating the first year when only running one fan.
(chasing a buddy in 100 deg temps at 100 plus speeds through central California on the way back from Laguna Seca)
Since I've gone to the two fan set-up the bikes runs cooler than an RC51 or VTR.
Also be aware that riding in the rain, the water coming off the rear tire, even with a hugger, water cools the radiator and the thermostat never fully opens.
Go for it.
Kai Ju
Senior Member
MotoGP
Joined: Jul 2007
Posts: 5,066
From: NYC
I ran no thermostat for months half summer (90+) & half winter (18-) & was amazed that it did not make that much difference. It made way more diff on my cbr but the front rad is a diff setup. The vtr doesnt ever seem to be able to "over cool" itself like a front rad bike in winter can.....
Senior Member
MotoGP
Joined: Aug 2007
Posts: 2,547
From: Way Out West
All the thermostat does is withhold coolant flow when the coolant on the engine side is below 169 degrees F.
Unless you're riding in sub freezing temps, the thermostat only matters for the few minutes between cold start and and 169 degrees. After that I don't think it matters one whit whether the thermostat is installed in the bike or sitting on a shelf in your garage.
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