KLR oil cooler - Kawasaki KLR 650 Forum
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post #1 of 37 Old 05-11-2008, 04:54 PM Thread Starter
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KLR oil cooler

I was wondering if you tech heads out there have an oil cooler on your KLR, or know somebody that does, and how they/you went about it.
I want to put one on mine, and I am looking for ideas. Bike runs great, runs strong, no issues, I just want ideas, not diologue on whether the KLR needs one or not, or quetions as to why I want one. Just ideas. I am also NOT looking for reasons not to put one on.
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post #2 of 37 Old 05-12-2008, 05:42 PM
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The oil pump can't do it. I know you said that isn't what you want to hear...sorry.
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post #3 of 37 Old 05-13-2008, 02:35 PM Thread Starter
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One idea

One great idea that has come my way, which seems feasible, is to put a small cooler in series with the feed pipe to the head and cams. This would not require additional volume or additional pressure. The oil pump can in fact work in this situation. That is why I specifically asked for NO reasons why a cooler won't work. Several options have been suggested, I am just looking for more creative input.
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post #4 of 37 Old 05-13-2008, 03:59 PM
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Creative? OK. Put an aftermarket 12v universal fuel pump ($30 at PepBoys) in line with a small radiator - all kinds and sizes available - and cool away. I'll also increase your oil capacity.
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post #5 of 37 Old 05-13-2008, 05:11 PM Thread Starter
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Oh yea.

Thanks Big Iron, I got a great cooler today, it is tagged as off of a CB400. The size is perfect. So are you suggesting pulling directly from the sump, go through the cooler, and then back to the sump?
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post #6 of 37 Old 05-13-2008, 06:04 PM
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The last thing you want to do is take oil away from the cams. Scrap that idea, it won't work.

Good idea on the electric pump pulling oil from the sump.

What's the point? Maybe put an oil temp gauge in and see if it's needed first?
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post #7 of 37 Old 05-13-2008, 07:54 PM
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Yes, I was thinking directly to and from the sump. It could be switched, either manually or automatically (thermal switch). The oil temp gauge would tell the tale. The problem with the valve feed (as I envision it) would be that the cooler would drain down and might make the valve train run dry longer on a cold start (if you had it on the feed side). Sorta like a turbo that has a leak in the feed line.
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post #8 of 37 Old 05-13-2008, 09:42 PM Thread Starter
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Cam starvation

An inline cooler on that line would not take away from the cam lubrication at all. In fact, the cooler tube diameter is twice the size as the stock tube. As someone mentioned before, it would add capacity. As far as drain back, it does that anyways stock, and the delay in lube time on startup would be less than 5 seconds, and there is plenty sitting around up there to handle that. I am not set on going that way, but the one problem it presents equally to the sump style, is having it thermally switched, or at least have a gate in front of the cooler, or a boot to put on it. I have it digitally monitored on the temp, and I would not mind pulling over to just move a flap out of the way to bring the cooler in to play.
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post #9 of 37 Old 05-14-2008, 07:54 AM
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Interesting thought about "overcooling" the engine. Since IC engines are supposedly designed to run best and most efficiently in a certain temp range additional cooling, be it oil or whatever, might keep it out of that range.

So thermal or manual switching might be useful. Just like the auxiliary thermally switched electric radiator cooling fan on some older verhicles.
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post #10 of 37 Old 05-14-2008, 01:35 PM
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Sounds like you have all the bugs worked out, I look forward to seeing pictures of the installation and a report on the difference it makes in the oil temp.

Thanks!
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