Messed up on my build need radiator advice
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@declan said in Messed up on my build need radiator advice:
@dan28 I was looking at one of those on ebay,it would likely me okay if room allows adding a radiator fan would help too
its alot smaller though an the fan for the gas gas rad is expensive even for a used one
i need to find out the sizes of the ktm sx 50 rads both together they should be equalivent to the dtr rad i think -
@dan28
The manual says that the cooling works by “thermo ~ syphonic action in conjunction with the pump”, but basically when the coolant in the cylinder sleeve is hot enough to actuate the thermostat and open up, the pump will move it. I don’t know any other motor that has the radiator physically above the motor to rely on heat rising through convection
I guess I’m saying that I’d test run it with the rad mounted where you want it and see if it works. As long as the pump moves the coolant I don’t see any problem
I could be totally wrong though!
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@spookdog said in Messed up on my build need radiator advice:
@dan28
The manual says that the cooling works by “thermo ~ syphonic action in conjunction with the pump”, but basically when the coolant in the cylinder sleeve is hot enough to actuate the thermostat and open up, the pump will move it. I don’t know any other motor that has the radiator physically above the motor to rely on heat rising through convection
I guess I’m saying that I’d test run it with the rad mounted where you want it and see if it works. As long as the pump moves the coolant I don’t see any problem
I could be totally wrong though!If you look at yours the water goes out the bottom rad hose along the metal pipe an to the water pump
The problem I have using the dtr rad the water goes out the bottom hose an then has to travel upwards to the water pump
A smaller radiator mounted higher up would solve the issue an the water would travel down as intended
I m not sure how to add photos on here -
The pump would still work and draw coolant up, it doesn’t rely on the coolant ‘falling’ down into the pump. It’s strong enough to lift fluid 2 foot. If it looks good, try it. If not do something that you like the look of!
There is a tutorial on this site for posting pics, if I can suss it you can! I use a phone and imgur (app) to host mine. Do a search, please, it sounds like a wicked build!...
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@spookdog I would rather it worked as yamaha intended so would like the radiator higher than the water pump
I trail fitted the gas gas radiator it will fit but as it is approx 15cm shorter then there will be less coolant compared compared to how much is in The standard radiator not sure if that's going to be an issue -
@declan said in Messed up on my build need radiator advice:
@dan28 I doubt the coolant volume being an issue
Would it not be the same as using your bike with a low coolant level as this radiator is 15cm shorter so quite a bit smaller -
@dan28
My temp gauge barely goes up a CM, only time it went up halfway was when the head gasket blew on the hot day (2 days ago). I could run a 15cm smaller radiator on my bike without heat issues.
Put a 12v fan on it with a temp probe to the radiator and it’d be fine, IMO... -
@spookdog after measuring the finned part of the gas gas radiator is only 15cm its literally half the size of the original
I remember callum saying he had issues with his bike running hot an he used the standard radiator
I would rather use a radiator closer to the intended size -
@calum
I always thought ideal temp was as close to 100 as possible? That’s why the radiator cap is pressurised, to stop the coolant boiling but get it up there? I might be wrong, it’s been a long time since I looked into it and it was a car... -
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@declan
It’s weird, my temp gauge doesn’t rise much at all in stop~start nightmare traffic. What does happen is my gear change gets ’sticky’, it won’t go into neutral without a struggle. That’s when my engine smells hot.Trouble is a radiator is doing next to nothing if it doesn’t have any airflow forcing convection. Sitting in traffic is the worst possible scenario. I don’t have any cooling problems, if I did I’d put 1 or 2 12v fans on the radiator. The kind you get in computers for CPU cooling but bigger, there’s loads out there. have a temperature actuator probe that sits in the fins of the radiator, so they only come on when needed. If the problem was bad I’d shroud the fans th the radiator as well...
