My bike never had one & I'm looking to install one because the mornings are getting chilly. Are there any cross overs from other Honda's that I can buy here in USA ? Or does some one have one I can purchase ? _________________
Ive got a couple kicking around if you need one but to be honest I dont run one even in the '18 (which is what I use on the road) and have used it though a number of British winters without trouble. _________________ If I have to take the carbs off once more...
A thermostat will only make this worse, as any thermostat will decrease the opening somewhat, even at fully open.
It can only help raising the temp on cold days, by lowering the flow to the radiator, it can't increase the flow, over what is possible without it ! _________________ Poul
"If Life Gets Boring, Risk It!"
MC21SE, KISS box
MC21SP, HRC box, racing loom
I think I have a new spare. I don't think there is a cross over. You can order a new one from Redline and have it in a week or so. _________________ james
Its not how fast you go...Its how you go fast.
MC21 Rothmans
RS250
RC31
CRF250X
748R
Porsche (many)
http://members.rennlist.com/j911brick/rennlist3_002.htm
A thermostat will only make this worse, as any thermostat will decrease the opening somewhat, even at fully open.
It can only help raising the temp on cold days, by lowering the flow to the radiator, it can't increase the flow, over what is possible without it !
Not always true. On some engines having a restriction can aid cooling by allowing more time for the coolant to absorb heat. Instead of rushing quickly past without taking the maximum amount of heat possible. Can supposedly maintain a more uniform temperature over the complete cylinder too.
On my MC21 race bike I just took the centre part of the thermostat out, leaving the original orifice as it was. I haven`t had any problems with the temperature yet. (Touch wood)!
A thermostat will only make this worse, as any thermostat will decrease the opening somewhat, even at fully open.
It can only help raising the temp on cold days, by lowering the flow to the radiator, it can't increase the flow, over what is possible without it !
Not always true. On some engines having a restriction can aid cooling by allowing more time for the coolant to absorb heat. Instead of rushing quickly past without taking the maximum amount of heat possible. Can supposedly maintain a more uniform temperature over the complete cylinder too.
On my MC21 race bike I just took the centre part of the thermostat out, leaving the original orifice as it was. I haven`t had any problems with the temperature yet. (Touch wood)!
This is true. If the water is moving through the radiator quickly especially when the vehicle is stopped and the radiator isn't getting air, it takes longer for it to do it's job and cool down the water passing within it.
even with a thermostat mine both struggle to get warm on cold days and overheat in traffic.
60°c sounds OK, try racing at Mallory in weather that saw WSB abandoned 30 miles away, 50°c out of the hairpin, back in the 40's by the end of the straight.... _________________ Please do not PM me technical questions, if you can't find it on the Forum start a thread
This is pure speculation. A restriction in flow will decrease effectiveness, meaning higher temp.
The thermostat increases temp by restricting flow. Now, at the same time, you say that restriction of flow too can decrease temp ??!!! _________________ Poul
"If Life Gets Boring, Risk It!"
MC21SE, KISS box
MC21SP, HRC box, racing loom
Actually, your wrong pbekkerh. Not running a thermostat will cause uneven temps in the motor and depending on where the sensors are, it can cause the gauge to lead you to the false impression the motor running cooler, or hotter, than it really is. It can also play havoc with the fan. I would never reccomend running without the thermostat or restricter. I've seen some cars that have to use the full thermostat because without it the coolant would be directed the wrong way and the car would overheat (and the gauge wouldn't know it).
If you have a motor with a cooling problem, removing the t-stat won't fix the problem! It will only mask it temporarily. You need to fix the (real) problem. _________________ james
Its not how fast you go...Its how you go fast.
MC21 Rothmans
RS250
RC31
CRF250X
748R
Porsche (many)
http://members.rennlist.com/j911brick/rennlist3_002.htm
j911brick: redirection of flow is not the function of a thermostat, its something extra build into it.
A thermostat controls temperature in an engine by restricting flow, giving lower cooling giving higher temp, OR increasing flow giving more cooling giving lower temp. Basta!
Thats all it does. When its fully opened, its function ceases. Then you can only get more cooling by removing it ( I talk only about the function a thermostat, if someone built a redirecting device or other into the thermostat is beside the point) as many thermostats decrease the diameter of the pipe where they sit.
Please don't just agree with the two guys, think and argue: how can the thermostat at the same time both decrease and increase cooling by the same mechanism: restriction of flow ??
I think we are moving dangerously close to the supernatural, but if anyone can finally expose the little devilish ghost in our bikes that burns out PGMs and reverses the physical laws in our cooling systems, I would be very happy. _________________ Poul
"If Life Gets Boring, Risk It!"
MC21SE, KISS box
MC21SP, HRC box, racing loom
Last edited by pbekkerh on Wed Aug 29, 2007 8:07 pm; edited 1 time in total
It can derease flow and increase cooling by allowing the water to sink more heat. Thats very simple. Slower flow, more heat sink, better cooling (up to a certain point). _________________ If I have to take the carbs off once more...
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