Author Topic: Heat (Read 24027 times)

kman · « **on:** June 20, 2015, 07:39:05 AM »

Hi Guys,
I'm new to Motobrick and K bikes. I acquired an 87 K75 , with 40K miles. The bike seems to have been cared for, and runs well. My concern is heat. The weather in NC has been extremely hot for several weeks,with temperatures in the mid 90's with no end in sight. I usually ride about 65 miles daily, with about half of that on the freeway at 70 MPH. How do these bikes handle the heat? The tank gets very hot, becoming a chestnut roaster. Any advice would be appreciated.

gazman · « **Reply #1 on:** June 20, 2015, 08:21:10 AM »

Welcome Kman, to the toasty world of K bikes. The search box is your friend.

rbm · « **Reply #2 on:** June 20, 2015, 09:03:39 AM »

K-bike Heat Management document. It's a collection of online articles about ways to combat engine generated heat.

wmax351 · « **Reply #3 on:** June 20, 2015, 11:14:17 AM »

Bike can certainly handle the heat. I've had mine to 110 in the desert.

Engines also don't care about the humidity. If anything, it improves cooling due to higher heat capacity of the air.

The question is, Can you handle the heat?

johnny · « **Reply #4 on:** June 20, 2015, 11:37:31 AM »

greetings kman...

welcome to motobrick.com...

whats your gotts there is the thigh roast... the motobrick thigh roast...

after lotts of reflection... i have concluded the fact of the matter is hot moto air becomes superheated moto air if it aints gotts no place to go...

so i remove all the foam and other blockages under there and let it flow... just let it flow... and go getts you some yeeeehaaaaaaa... thats right... so stop your freaking and commence to motobricking...

j o

F14CRAZY · « **Reply #5 on:** June 20, 2015, 01:25:04 PM »

I have a VDO temp gauge on my bike and it never gets above about 180 degrees unless stuck in traffic. Want to make sure your fan works as it will get too hot in a summer traffic jam. I was seeing like 240 at one point. With a working fan you'll have nothing to worry about. At the expense of the rider's comfort the engine can keep itself cool no matter how high the ambient temp is

Elipten · « **Reply #6 on:** June 20, 2015, 03:35:19 PM »

They cook the rider in North America climate. It ain't called the toaster for nothing. I'm convinced they were designed for wet, northern European climate with no thought for other areas of the world.

The Mighty Gryphon · « **Reply #7 on:** June 20, 2015, 06:38:52 PM »

Here's a link to a thread on putting a cooler on my K75RT. The whole thing cost under $85 complete with fittings, bracket and hose. I have ridden in temps up to 80+ now and there has been no discernible heating of the tank. Makes the bike a pleasure to ride in warm weather.

http://www.k100-forum.com/t9594-k75rt-fuel-cooler

kman · « **Reply #8 on:** June 20, 2015, 08:45:18 PM »

You guys have given me a lot to ponder. And to top it off, my fan quit fannin today. I'll track that grimlin down tomorrow, and let you know what I find. Thanks a bunch.

Elipten · « **Reply #9 on:** June 20, 2015, 09:15:13 PM »

The BMW fans are junk. The engineer that chose that fan which is obviously not a fan for exposure to the elements, should be punished.

Break it free and lube it to get by for a bit.

This winter I will be replacing mine with the SPAL fan. I wish someone would make the mounting brackets for the SPAL fan and fuel cooler.

F14CRAZY · « **Reply #10 on:** June 20, 2015, 09:39:19 PM »

Quote from: Elipten on June 20, 2015, 03:35:19 PM

They cook the rider in North America climate. It ain't called the toaster for nothing. I'm convinced they were designed for wet, northern European climate with no thought for other areas of the world.

Well Germany isn't a very hot country

Elipten · « **Reply #11 on:** June 20, 2015, 11:06:18 PM »

Yep a rider benefits from the hot bike!

Freelancer · « **Reply #12 on:** June 21, 2015, 04:02:50 AM »

Next time I pull the side panel off of my bike, I'll take pictures of what has worked for me down here in Texas.

What I did:
There is a hose you can get at napa that will fit over your existing fuel line. This help insulate the return line from the engine heat.

I also, relocated my fuel pressure regulator to the outside of the throttle bodies.

Doing these two things and nothing else has stopped the hot tank problem. No need for a fuel cooler, just get the regulator out from behind the radiator and from baking in still air right on top of the engine.

Until you are comfortable doing this ttype mod, I would suggest that you refill at the half tank point. Not a fix but it will help keep the temp down a bit.

Hope this helps,
Freelancer

The Mighty Gryphon · « **Reply #13 on:** June 21, 2015, 07:41:39 AM »

Freelancer: I have a '92 K100RS and would be very interested in seeing how you mounted the fuel pressure regulator. I have been thinking that it would not only help the hot tank problem, but would make access to the associated fuel return and vacuum lines a lot easier.

Freelancer · « **Reply #14 on:** June 21, 2015, 06:14:14 PM »

Will take pics of the current mounting and post them up soon.
I know that I should be better about documenting my mods at the time I'm doing them. But, once I start on a project, I don't like to stop working for anything.

Later,
Freelancer

bocutter Ed · « **Reply #15 on:** June 22, 2015, 09:55:35 AM »

Quote from: Freelancer on June 21, 2015, 06:14:14 PM

I know that I should be better about documenting my mods at the time I'm doing them. But, once I start on a project, I don't like to stop working for anything.

Yeah, a few weeks ago I started documenting turning a bezel for a 'ships' compass. Here's the complete tutorial (second photo supplied by client) :hehehe :

johnny · « **Reply #16 on:** June 22, 2015, 10:05:45 AM »

greetings bocutter ed...

thats hack... figger better effort from a geezer like you...

j o

bocutter Ed · « **Reply #17 on:** June 22, 2015, 11:31:58 AM »

Yeah, hack and whack. The spinny thing can suck you in and spit you out wondering where the time went ...

On the other hand I have lots of pics of the wood top-case I'm buidlng ... that probably won't get posted anywhere.

johnny · « **Reply #18 on:** June 22, 2015, 11:57:45 AM »

put me down for a wood iconic 22 liter top box...

j o

kman · « **Reply #19 on:** June 23, 2015, 07:15:16 PM »

OK Guys, I have a fan that that wont fan and no insulation under the tank. I have everything on order, and expecting delivery next week. I ordered a SPAL 7.5 fan, a finned aluminum cooler for the fuel , and insulation for the fuel lines. I will also add a Johnny blanket. Until my Brick is back on the road I,ll have to ride my cruiser. Temps were 101 today, and may be too hot for anything.

vrmntynkee · « **Reply #20 on:** June 24, 2015, 03:49:27 PM »

I mentioned to the local and expensive BMW dealer (in NC, actually) that I was restoring a K75. He mentioned, without me asking, that they are bulletproof in the heat due to the fact that it uses the same cooling system as the K 1000. Even went so far as to say in the fan isn't even needed on the 750 with the cooling system for a 1000.

F14CRAZY · « **Reply #21 on:** June 24, 2015, 05:31:10 PM »

Quote from: vrmntynkee on June 24, 2015, 03:49:27 PM

I mentioned to the local and expensive BMW dealer (in NC, actually) that I was restoring a K75. He mentioned, without me asking, that they are bulletproof in the heat due to the fact that it uses the same cooling system as the K 1000. Even went so far as to say in the fan isn't even needed on the 750 with the cooling system for a 1000.

Well the water pump is the same from a K1200LT

but

get sitting in traffic for a while and you're gonna need that fan for sure. It won't ever turn on in normal riding though

kman · « **Reply #22 on:** June 24, 2015, 05:48:24 PM »

I'm surer that it doesn't need the fan, as long as you'r moving. With the heat we've had over the last few week and the traffic around Charlotte, the bike will not live without the fan.

Freelancer · « **Reply #23 on:** June 24, 2015, 06:31:04 PM »

Hi all,

Here are some pics of a very dirty intake area. They show where I relocated the Fuel Pressure Regulator.

I ended up only insulating the little curve between the fuel rail and the regulator. You'll see "5 V's" cut into nto the outer insulating hose on the inside radius so that it would bend without kinking. This also helps the fuel line to not kink.

The reason for the positioning are several:
1st) It allowed for the easiest mod of the oem bracket. This allowed me to use the same screw mounting holes in the bracket.

2nd)This allowed the use of the screws directly outside of the original location(Only place it really fit without custom brackets, having to clearance the fairing or "miles of extra fuel line.)

3rd) Most importantly, this fuel line routing has the smallest amount of line that sits in the "hot box" area.
(My theory was that the FPR's position and all the extra hose that sits in the hot area was the cause of the "fuel heating" hot tank problem.)

4th and finally) This was the cheapest way to test out the idea. :2thumbup: At some point I could try to make it prettier but seeing as the fairing covers it, I'm thinking "if it works, don't "F" withit. :yes

Before this mod the tank would start the thigh burn at the half tank on a 90 degree day.
Now, I can run her to the fuel light on a 98 degree day with no warm feeling.

If you have questions about this, feel free to ask.

Here are the pic's,
Freelancer

Freelancer · « **Reply #24 on:** June 24, 2015, 06:32:59 PM »

Weird .....double post, sorry

News:

Author Topic: Heat (Read 24027 times)