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Old 10-26-2011, 10:11 AM   #16
Wattner
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Originally Posted by spezjag View Post
The real heat is not generated by the friction of the piston rings rubbing against the cylinder walls, but rather by the combustion in the cylinder head. The oil temps rise because that heat is transferred to the oil that lubricates and cools the valve mechanisms.
Very plausible explanation.... I bet big fins on the jug would help, couldn't hurt and would look cool as well
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Old 10-26-2011, 10:11 AM   #17
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And I would be interested in this, except as a service (send my cylinder head in, have the fins installed, then returned to me). I would prefer the one stop shop so I can have confidence they're being installed correctly, and I don't have the welding skills to do it myself.
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Old 10-26-2011, 10:12 AM   #18
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and would look cool as well
Well there is that . . .




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Old 10-26-2011, 10:12 AM   #19
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ship to el salvador?

I would though...we get good tig welding on stainless...is it the same welder for aluminum or is it a different type of tig welding

sorry for the stupid question...

also do the big finned caps fit in a stock bike/frame or do you need to modify anything?l

I would love a set of the caps...do they aid in cooling a bit?

thanks
If you have a good tig welder that can do stainless I'm sure he can do aluminum too.
Yes I will ship to el salvador..
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Old 10-26-2011, 10:16 AM   #20
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And I would be interested in this, except as a service (send my cylinder head in, have the fins installed, then returned to me). I would prefer the one stop shop so I can have confidence they're being installed correctly, and I don't have the welding skills to do it myself.
No problem I can do that for you and I might weld flat pieces of aluminum on the fins instead of the dowel pins don't know yet, the dowel pins are faster for me to do and easyier...
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Old 10-26-2011, 10:19 AM   #21
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Very plausible explanation.... I bet big fins on the jug would help, couldn't hurt and would look cool as well

They would definitely help cool the pig and look trick as hell matching the head..
The XS750 yamaha big bore flat tracker kits come with big fins on there cylinders for a reason..
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Old 10-26-2011, 10:19 AM   #22
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I could make a big finned head kit for the XR400 if I had a 400 head which I don't right now darnit..
I'd be glad to get you any measurements that you would need from my 400.
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Old 10-26-2011, 10:20 AM   #23
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Well there is that . . .




dat for sure..
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Old 10-26-2011, 10:21 AM   #24
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I'd be glad to get you any measurements that you would need from my 400.
If you could take some cardboard and make some templates I will mill you out a kit on my cnc mill.
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Old 10-26-2011, 10:38 AM   #25
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If you have a good tig welder that can do stainless I'm sure he can do aluminum too.
Yes I will ship to el salvador..
cool I did not know that...

he welded the tips on stainless exhausts for me and also just fixed my FMF pipe for me with tig...he is good...nice beads...

thanks Im very interested

cheers
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Old 10-26-2011, 10:50 AM   #26
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I think might nailed it, about 30 degrees cooler..
What kind of before temps are we talking about ?250 degrees or even 300 ? What temps are people seeing ?
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Old 10-26-2011, 10:58 AM   #27
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What kind of before temps are we talking about ?250 degrees or even 300 ? What temps are people seeing ?
An air cooled motor needs air flow...sitting in a traffic jam with no air flow the motor will get hot but once your moving out on the freeway or fire trail the temps will be at or below 200 from 250, 280 or 300.......
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Old 10-26-2011, 11:19 AM   #28
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An air cooled motor needs air flow...sitting in a traffic jam with no air flow the motor will get hot but once your moving out on the freeway or fire trail the temps will be at or below 200 from 250, 280 or 300.......
So will the bigger fins lower the temp by 30 degrees when the bike isn't moving ?
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Old 10-26-2011, 11:23 AM   #29
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So will the bigger fins lower the temp by 30 degrees when the bike isn't moving ?

No. What part of the bike moving to get cooled did you miss??
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Old 10-26-2011, 11:32 AM   #30
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So will the bigger fins lower the temp by 30 degrees when the bike isn't moving ?

I would have to say in traffic sitting still that the fins don't do too much. On the new bike, I was steadily showing 146 degrees while moving at all... Once I stopped in traffic for 30 minutes or so, the temps went up to 303.... I was having problems with the battery, so I could not shut the bike off and saw the temps getting on up there. Once I rolled even 10' the temps started dropping fast. After we got roiling again at speed, it took maybe 5 minutes to get back down to 150 or so. The outside temps were in the upper 70's FYI

I think the fins do great once there is any wind at all on them.
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