fuel return through oil cooler? - BMW Luxury Touring Community
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post #1 of 5 Old Sep 15th, 2008, 8:37 pm Thread Starter
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Lightbulb fuel return through oil cooler?

Has anyone tried running the return fuel through a small oil cooler mounted in front of the radiator to cool it further before it returns to the fuel tank?
I'm thinking that this would significantly lower some of the rider discomfort associated with heat radiating off of the fuel tank.

What do people think?
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post #2 of 5 Old Sep 15th, 2008, 11:09 pm
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Re: fuel return through oil cooler?

Interesting thought... I'm probably wrong, because I can only use a hammer...

But, I get some heat off the radiators, not the bike.

Dcn Channing

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post #3 of 5 Old Sep 15th, 2008, 11:27 pm
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Re: fuel return through oil cooler?

Fuel return?

From the standpoint of thermodynamics, the greatest energy released from the chemical reaction in the combustion chamber occurs when you have the largest temperature difference between the input and the output. To make a long story short, no, you can't efficiently cool the contents of your gas tank enough to make a noticeable difference.

Your best bet for reducing the amount of heat you get from the fuel tank to you would be to put an infrared barrier between the tank and the engine to reflect the engine heat back into the engine. Try some aluminum tape on the exterior of your tank and let us know how it work for keeping you cooler.

Tim Barstow

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post #4 of 5 Old Sep 16th, 2008, 7:01 pm
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Re: fuel return through oil cooler?

He's talking about the heat coming of a K100,

if you'll do some research on the K-bike site you'll find that all of the Ideas you can come up with have already been tried (with limited or no success)

I'll sum it up for you, if you put insulation behind the side panels (where your knees are) it will "channel" the heat back under the gas tank to the bottom of your seat and set your ass on fire (not really but it will sure feel like it)

you can have limited success by putting insulation under the gas tank and under your seat but this will shorten your battery life as a lot of the engine heat will flow over it. (It's got to go somewhere)

I suggest some strategically placed "air wings"
to push the air envelope out around your legs.
Baker used to make some for the K-bikes, I don't know if they still do.

The oil cooler in the fuel "loop has already been tried it didn't make any noticeable difference.

Your profile is incomplete so we don't know what part of the (world/country) you're in,

regardless the K100 is going to be one of the "hottest" bikes to ride,
your choices are limited
accept it, sell it, or move to a cooler climate.

St. Petersburg FL

2002 K1200LTE
"Silver Buffalo" Totaled 5/06
2005 LT
"Our preferred long distance carrier"

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post #5 of 5 Old Sep 20th, 2008, 7:09 am
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Re: fuel return through oil cooler?

I put Baker wind wings on my 75RT this spring. They do a good job of directing the air to your knees. My shins touch the fairing pads, so I don't get the full effect unless I splay my knees out a little.

The K75/K100 wings are no longer being produced, but they still had some in stock this spring.


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