bigger radiator test
Posted February 21, 2013 - 05:59 AM
To my surprise, the rads look really good, much better than expected for the money (good welds, thick walls, thick body, but crappy cap). Also, had some good comments about their better cooling ability due to more capacity, since they are 40mm instead of the 23mm or so from OEM rads.
I always thought this bikes run a little bit too hot, specially at low speeds or hot enviroment (desert, wind form behind, hi-reving in mud or deep sand, etc) , and I think that some extra cooling would help in engine durability, reliability and efficiency., so I decided to kill my curiosity and test them.
First installed the temperature gauge right after the engine water exit.
Then run the test with OEM rads, from a totally cold engine, one day in the morning. After that, installed the CHN rads and run the same test in the afternoon, also form a totally cold engine and almost same conditions (same spot, about same ambient temperature, etc)
The test I run was very simple, home-made-non-scientific. First the “static test”: start the bike and keep it completely idle for 10 minutes (not a single gas turn). Take temp readings every 30sec the first 5 min, then every 1 min. At minute 10, turn it off and keep reading for another 5 min. After that, the “dynamic” test: run the bike hard for 3 minutes. After stopping, read the current temp and then again 1, 3 and 10 minutes after that.
After that, installed the CHN rads and hoses, and repeat the test. (kept the OEM cup)
Here, the results. (The temperature is in Celsius, sorry Fahrenheit fans)
My interpretation and oppinion:
They cool a little more (about 2 ºC) when the bike is heating up, up to a certain temperature when them both cool the same. When riding, the also cool 2-3 ºC more. When stopped, the CHN get cold faster 4ºC).
They look stronger. Couldn´t test that yet, we´ll se after a few falls if that´s true
They are heavier (rads+coolant weight like 0.5Kg more)
They don´t fit so well: the shrouds needed some hard pulling to get in place.
My general conclussion is that they seem to run a -little- better, specially when running and after stopping.
Not worth the replacement for performance reasons, but a very cheap replacement choice.
Bike: 08` WR450f with stock water pump and exhaust pipe. OEM rads non bent nor hit.
Altitude: sea level
Coolant: water with no special coolant (there´s a reason for that)
Env: 24-25 ºC, no wind, cloudy
Try them in the desert raid.
Install a fan cooler and run the test with different coolants (i think THERE will be a difference)
Install a hi-flow water pump.
Best regards, from Argentina.
Posted March 10, 2013 - 09:14 AM
Posted March 25, 2013 - 06:31 PM
Posted March 27, 2013 - 01:35 PM
The cooling performance really doesn't improve without installing a fan(s). If the air isn't flowing, the heat isn't either.
It's not worth your time to test again with & without a fan, but I'd think the larger Chinese rads would cool better then. But since the OEM cool quite well when the air flows I just mounted a fan.
Posted March 27, 2013 - 01:52 PM
Posted March 28, 2013 - 05:00 PM
Posted June 02, 2013 - 03:27 PM
Just picked up a pair for around $90 shipped. I recommend folks change out the hoses when you do this. its cheap and you are already in there.