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Old August 1st, 2020, 06:01 AM   #1
Emu
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Japanese guy adds sub radiator

https://www.youtube.com/watch?v=bCQz4NaJaPc

Looks like the japanese bro added a sub radiator to see how effective it would be at cooling his bike. He puts up hard numbers and graphs.

All you guys who run new gens at the track, do you guys use a dual radiator? Would you consider it?
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Old August 2nd, 2020, 11:55 AM   #2
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We removed one of the radiators from our CRF150R Supermoto to try to keep the temps up.

Running too cold isn't optimal. With the right tuning and engine oil, higher temps are safe and can make more power.
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Old August 2nd, 2020, 12:17 PM   #3
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Quote:
Originally Posted by jkv45 View Post
We removed one of the radiators from our CRF150R Supermoto to try to keep the temps up.

Running too cold isn't optimal. With the right tuning and engine oil, higher temps are safe and can make more power.
Depends on the engine. My hp4 gets a notable power gain with a subradiator to cool it better.
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Old August 2nd, 2020, 12:39 PM   #4
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Yeah, varies depending upon engine design and usage. Typically keeping it within design-envelope of temps would be best.

My '08 race-bike's been through 3-years of racing with +40 track-days per year with factory radiator with thermostat and fan removed for more flow. Warm-up takes longer on cold-days, but it does fine on +110F days at constant full-throttle. I do occasionally see yellow warning-light go off at 230F. I do give it 5-minutes cruising at low-loads after each session to cool off.

Ideally you want to run as high-temperature as materials can withstand. That's to reduce delta-T between combustion-chamber and surroundings which rob heat that could be used to expand combustion-gasses that push down piston. The more you cool combustion, the less pressure you have pushing down piston. That's benefit of thermal coatings on pistons tops, valves and cylinder heads, too reduce heat transferred away and keep it in combustion chamber.

Honda's actually been experimenting with ceramic-based engines that doesn't use any coolant at all and runs at +1000 degrees. No heat-loss to coolant jacket and they're getting higher power and efficiency.
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