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Post by jessy03 on Sept 21, 2013 13:09:50 GMT 1
I'm building a big bore project and am thinking about cooling the thing, I have a 2012 R6 radiator with twin fans which looks like it will nicely however only holds about 850ml of coolant compared to the std LC which is 700ml ish, but the surface area of the R6 is double that of the std LC rad.
Question is - would it be better to have surface area over coolant volume? The R6 rad is curved and would catch more cool air??
Jess
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Post by midlifecrisisrd on Sept 21, 2013 13:16:15 GMT 1
wider area with thinner core wii cool more effectively
if it cools an R6 at 16k then a stroker should be fine
steve
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Post by steven on Sept 21, 2013 15:36:12 GMT 1
i would recon that if it has got lecky fans fitted, you could just rig them up to a switch/switches and switch them on and off as required, or even better, to a thermostat temperature switch type doo dah, set to a desired temperature to bring the fan/fans on.
i would also be concerned that it may keep it too cool, and not let the engine get up to temp properly, but im only guessing as iv never used anything other than a standard radiator.
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Post by daveo on Sept 21, 2013 20:14:43 GMT 1
Area is directly proportional to the heat output - double the area gives double the heat output, all else being equal. Volume is incidental to the area but will affect the time constant of the system, a bigger volume having a bigger time constant, but with the volumes you are talking about the difference between the two will be negligible.
Upgrading the rad. area is a good thing to do if you are going big-bore as there will be more heat input at the engine so you should compliment this with more heat output at the rad.
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Post by lb on Sept 22, 2013 1:52:56 GMT 1
You'd def need to run a thermo stat then wouldn't you?
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Post by daveo on Sept 22, 2013 2:12:49 GMT 1
Not necessarily. My engine builder has recommended running without the stat, getting a proper degrees C meter to accurately measure the water temp. and taping up the rad if needed to keep a temp of 56 degC in the head.
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Post by bare on Sept 22, 2013 3:41:29 GMT 1
Genius approach there.. On the track at full bore? or in the twisties? or going shopping. Entirely differing scenarios.. But hey! a bit 'o tape and it's all good.
Fit a Morris minor heater core... and be happy :-0
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Post by lb on Sept 22, 2013 11:15:51 GMT 1
Not necessarily. My engine builder has recommended running without the stat, getting a proper degrees C meter to accurately measure the water temp. and taping up the rad if needed to keep a temp of 56 degC in the head. Well just in case,here's what we use over here.Proven to work,you can thank JonW for it... www.kartingdirect.com.au/radiators-and-parts/inline-thermostat-kartelli-corse |
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Post by slinger on Sept 22, 2013 13:22:22 GMT 1
Not necessarily. My engine builder has recommended running without the stat, getting a proper degrees C meter to accurately measure the water temp. and taping up the rad if needed to keep a temp of 56 degC in the head. Not really a wise idea not to use a stat on this era of motor from Yamaha. It's a very poor design how the water enters the cylinders, your end up cooling the head just fine, but with out a stat your not slow the flow of water down enough to cool the barrels. All your doing is flowing through the head and over the barrels. You may well see a reading on your gauge of 50*c, but I know the barrels will be a lot hot than that with out a stat. |
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Post by daveo on Sept 22, 2013 14:40:16 GMT 1
Thanks for the advice on 'stat removal, I'll talk it over with my engine builder and let you know what he says.
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Post by jessy03 on Sept 22, 2013 17:07:36 GMT 1
Thanks for the response guys, I'll proceed with the R6 rad and fingers crossed it will be adequate, I had planned on using a 50 degree stat also. I also plan to use a thermo switch to control the fans.
The project is not ready to start - still collecting parts but I will start a thread once it's full steam ahead.
Jess
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