Cooling fin Dampers

stuartracing

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Dec 9, 2008
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I just got done putting some rubber dampers in between the cooling fins on my motor, and man did it almost get rid of all the reverberation,vibration,harmonics,whatever you want to call it....It`s alot more smoother,quiter,ec.t ect.....I had some clear hose laying around and just squeezed in together and pushed it into the cooling fins and cut off the extra sticking out...1" peices all in the cyl.`s fins and head....No melting or falling out....I think it`s worth doing,JMO....
Paul.....
 
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Dave31

Active Member
Mar 1, 2008
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Aztlán, Arizona
You know I have always wondered about rubberized under coating. Especially if you wanted your motor black.

Do you think it would restrict the cooling too much?
 

stuartracing

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Dec 9, 2008
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I can smell that smell!! :eek:
I wold think the coatings would have an affect on the cooling....No way for it to dissapate.....I actually drilled holes in my outer covers to let excess heat get out quicker(see pictures in picture thread)....Every cover on my bike is drilled with holes for cooling...Here in FL. it gets pretty hot.....But it does let more noise out of the motor,like the clutch side....I just use my air hose to blow out any dirt ....
Paul....
 

eDJ

Member
Jul 8, 2008
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Wayne National Forest
A lot of the Japanese motorcycles used these small black hard rubber disc wedged between the cylinder fins lined up like a column. I think they cemented them in place but over time some of them would vibrate out. I cemented mine back in place with high temp RTV. I wonder if looking back over the small Japanese (Kids Dirt Bikes) bikes that used the small disc would
find a source for them that would fit these China bikes. Or....if anyone here finds a high temp plastic that could be sliced into such disc would mention it.
Perhaps something which could be purchased by the foot.

In that time I was also wondering about cooling, fin size, and noise. My first question regarded which cools best, 1) unfinished metal, or 2) painted metal ?

I talked to quite a few people about it and one day I was working in the HQ test lab where I worked and in running the test on the units this Electrical Engineer dropped by from their company. As I talked to him about his company's products I pointed out how all the parts which would operate at high temp's were painted. That's when he explained that research had shown that painting those parts helped to cool them better but the paint had to be suited to that temperature. He laughed and said that if it cooled adequately without it that they sure wouldn't spend the extra time and money to paint those parts.
 

stuartracing

New Member
Dec 9, 2008
488
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Gainesville FL.
A lot of the Japanese motorcycles used these small black hard rubber disc wedged between the cylinder fins lined up like a column. I think they cemented them in place but over time some of them would vibrate out. I cemented mine back in place with high temp RTV. I wonder if looking back over the small Japanese (Kids Dirt Bikes) bikes that used the small disc would
find a source for them that would fit these China bikes. Or....if anyone here finds a high temp plastic that could be sliced into such disc would mention it.
Perhaps something which could be purchased by the foot.

In that time I was also wondering about cooling, fin size, and noise. My first question regarded which cools best, 1) unfinished metal, or 2) painted metal ?

I talked to quite a few people about it and one day I was working in the HQ test lab where I worked and in running the test on the units this Electrical Engineer dropped by from their company. As I talked to him about his company's products I pointed out how all the parts which would operate at high temp's were painted. That's when he explained that research had shown that painting those parts helped to cool them better but the paint had to be suited to that temperature. He laughed and said that if it cooled adequately without it that they sure wouldn't spend the extra time and money to paint those parts.
I think lighter colred paints are supposed to dissapate heat better that darker colors.....I think I saw something about in on Power Block t.v./or Horsepower T.V.....Might be something to it....
The rubber dampers were in some of my street bike also.....Now I know what they were for....I`m sold on it now....
P....
 

jasonh

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Jun 23, 2008
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A lot of the Japanese motorcycles used these small black hard rubber disc wedged between the cylinder fins lined up like a column. I think they cemented them in place but over time some of them would vibrate out. I cemented mine back in place with high temp RTV. I wonder if looking back over the small Japanese (Kids Dirt Bikes) bikes that used the small disc would
find a source for them that would fit these China bikes. Or....if anyone here finds a high temp plastic that could be sliced into such disc would mention it.
Perhaps something which could be purchased by the foot.

well if you can find a thick slab of silicone, that oughta do it. Silicone can handle temps to like 450 or 500 degrees.

You can get high-temp silicone hose at an auto store that has a fairly small diameter...not sure if it would be small enough to wedge between the fins or not. Worth a shot, even though it's not solid.
 

AlphaLlama

New Member
Sep 23, 2008
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Stockton, Cali
I have been using these rubber faucet washers. The large size. They are
a couple of dollars for a box at the hardware store. The one in the picture has been used and there is no sign of any heat reaction.
 

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RoadMaster

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Dec 6, 2008
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Vietnam
.....I actually drilled holes in my outer covers to let excess heat get out quicker(see pictures in picture thread)....Every cover on my bike is drilled with holes for cooling...Here in FL. it gets pretty hot.....But it does let more noise out of the motor,like the clutch side....I just use my air hose to blow out any dirt ....
Paul....
With all due respect mate...I just can't see how drilling holes in your clutch and magneto covers would help with cooling. They are not adjacent to the combustion chamber and they never get hot. Those areas are covered for more than just safety. It's so dirt and moisture won't get in. I could be wrong but...
 

stuartracing

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Dec 9, 2008
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Gainesville FL.
With all due respect mate...I just can't see how drilling holes in your clutch and magneto covers would help with cooling. They are not adjacent to the combustion chamber and they never get hot. Those areas are covered for more than just safety. It's so dirt and moisture won't get in. I could be wrong but...
You have the right to your opinion.......
But here in Fl. in the summer , everything gets hot here.....I ride mine sometimes for long distances at a time and the whole motor gets hot....
But I could be wrong.....boogy1a
Cheers Mate,
Paul.......
 

trackfodder

Member
Sep 8, 2008
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Dee-The heat sinks for diodes are always flat black. There is tons of barbecue grill rattlecans out there, or manifold paint if you wish. Most all enduro cylinders are also flat black. Keith
 

eDJ

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Jul 8, 2008
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Wayne National Forest
Keith, It runs in my mind the paint color was black on compressors of the units we tested but other parts of those units were lighter colors. (come to think of it) I've always seen air cooled cylinders painted black or left natural or painted something close to natural if they were painted.

What alphallama is saying could sure work for me. There is an old hardware store which has those things in every size shape and description and even some other materials near by. But if the cheap black ones could do it and hold up I'll be trying them. The hole in their center is maybe 3/16" ?

On the cutting holes in covers, I've seen it done on racing bikes quite often. It vents heat, lightens if just a few ounces of material, and the things only are used on the track anyways and teardowns are a given. For riding on the road as transportation....perhaps not. But I've seen some racers where it looked like termites chewed up the covers.

Jason, I had a 500 Kawasaki that I had to hold one carb on the intake port with some high temp RTV as part of the plastic spacer in it had broken out. I was always fearing air leaks or it coming off on a ride. The stuff was a burnt orange color that I got at the parts place and I think it had 475 degrees printed on the tube as a suggest not to exceed temp. Once I was at a dirt bike hill climb and the guys had this mustard yellow 3M's goop they were securing everything on the bikes that could vibrate loose with it. Nasty looking but the dirt and mud covered it up soon enough.