Does painting engine fins reduce cooling.
- Nerdy
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Re: Does painting engine fins reduce cooling.
17 Aug 2021 18:16OK....digging back into my heat transfer class from 1980...
There are three mechanisms for heat transfer....conduction, convection and thermal radiation.
Fun fact (and fun thought exercise): convection currents do not work in zero gravity.
1967 Yamaha YCS1 Bonanza
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1981 Yamaha XT250H
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- hardrockminer
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Re: Does painting engine fins reduce cooling.
18 Aug 2021 05:02 - 18 Aug 2021 05:04OK....digging back into my heat transfer class from 1980...
There are three mechanisms for heat transfer....conduction, convection and thermal radiation.
Fun fact (and fun thought exercise): convection currents do not work in zero gravity.
Close but not totally correct. Convection works on the space station. I think you meant that it doesn't work in the absence of air (in deep space) and that would be true. This is why the only way heat can escape the earth is via thermal radiation.
All objects emit thermal radiation towards cooler objects. The amount emitted depends on the temperature difference between the two. Light is just a specific part of the emission spectrum that includes ultra violet and infra red. The only difference between these three is their energy level. If you heat something high enough it will emit light...which is why steel begins to glow when it's really hot. Under normal circumstances it only emits infra red energy.
I have several restored bikes along with a 2006 Goldwing with a sidecar. My wife has a 2019 Suzuki DR 650 for on and off road.
Last edit: 18 Aug 2021 05:04 by hardrockminer.
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Re: Does painting engine fins reduce cooling.
18 Aug 2021 08:35
Mine was doing the same thing. Back in the day cleaning it up wasn't an option so I painted it black. I like the look anyway. It does seem to run a little hotter and my oil cooler seems to deal with that. It is a matter of taste more than utility. The Z1A/B's weren't painted as were the KZ900/1000's. They did have a clear coating on them and that's what made them discolor so badly. I never liked the look of the silver painted engines (cheesy) and had the same questions abut heat dissipation. I suspect black, silver or clear dissipate heat at about the same rate.
Steve
Steve
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- Nerdy
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Re: Does painting engine fins reduce cooling.
18 Aug 2021 18:25Fun fact (and fun thought exercise): convection currents do not work in zero gravity.
Close but not totally correct. Convection works on the space station. I think you meant that it doesn't work in the absence of air (in deep space) and that would be true. This is why the only way heat can escape the earth is via thermal radiation.
I was thinking of convection currents where warm air rises because it is less dense than cooler air, e.g. weather type currents.
Would the space station be described as having microgravity rather than zero gravity? I could see warm air rising/cool air falling in that sort of environment since little force would be required to move the air.
The way I understand it (which could easily be wrong - this isn't my area) is that if you were way the heck out in the middle of space and you had a silo-type living enclosure, you could have a heater in the bottom of it and the warm air wouldn't rise because there would be no gravity to pull the cold air down to displace the warm air.
There wouldn't really be an up or down out there, either, but we'll ignore that for now.
1967 Yamaha YCS1 Bonanza
1980 KZ440B
1981 Yamaha XT250H
1981 KZ440 LTD project bike
1981 GPz550
2013 Yamaha FZ6R
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- Dr. Gamma
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Re: Does painting engine fins reduce cooling.
19 Aug 2021 16:26
Kal Gard makes an engine coating called Gun Kote. It came about from some military or space program way back in the '60's. This coating when applied to motorcycle motors helps greatly with heat dissipation. Yoshimura has used this coating from the very early days of their Superbike program. Its a very durable coating too!!! NOTHING takes this coating off when applied correctly. The only way to remove it is to glass bead or sandblast it!!! Most racebikes in the '70's and '80's had this coating applied to their motors. Suzuki has used this very same coating on all their oil cooled GSXR and Kanatuna motors since those bikes first came out in the showroom. I believe they still apply this coating to their GSXR model bikes. This is the only engine coating I know of that actually helps in the dissipation of engine heat.
Suzuki GSXR750 motor with the Gun Kote coating.
Kz1000 motor with the Gun Kote coating.
Suzuki GSXR750 motor with the Gun Kote coating.
Kz1000 motor with the Gun Kote coating.
1972 H2 750 Cafe Racer built in 1974.
1976 KH400 Production Road Racer.
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Up in the hills near Prescott, Az.
1976 KH400 Production Road Racer.
1979 Kz1000 MK. II Old AMA/WERA Superbike.
1986 RG500G 2 stroke terror.
1986 GSXR750RG The one with the clutch that rattles!
Up in the hills near Prescott, Az.
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Re: Does painting engine fins reduce cooling.
19 Aug 2021 17:01Yep, KG industries 2400 series paint is the one...Kal Gard makes an engine coating called Gun Kote. It came about from some military or space program way back in the '60's. This coating when applied to motorcycle motors helps greatly with heat dissipation. Yoshimura has used this coating from the very early days of their Superbike program. Its a very durable coating too!!! NOTHING takes this coating off when applied correctly. The only way to remove it is to glass bead or sandblast it!!! Most racebikes in the '70's and '80's had this coating applied to their motors. Suzuki has used this very same coating on all their oil cooled GSXR and Kanatuna motors since those bikes first came out in the showroom. I believe they still apply this coating to their GSXR model bikes. This is the only engine coating I know of that actually helps in the dissipation of engine heat.
Suzuki GSXR750 motor with the Gun Kote coating.
Kz1000 motor with the Gun Kote coating.
shop.kgcoatings.com/kg/product/2401df/
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