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OEM is NOT always the BEST (COOLING)
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flybd5
Flying Brick Rider


Joined: 01 Jul 2019
Posts: 371
Location: Massachusetts, USA

PostPosted: Mon Oct 28, 2019 2:16 pm    Post subject: Reply with quote

Jim wrote:
More info about lower temp thermostats:

http://www.tuneruniversity.com/blog/2012/04/low-temp-thermostats-whats-the-advantage/

Or, why not leave well enough alone?


You're kidding, right? German technology is not designed for that. Very Happy
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K1100Cster



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PostPosted: Mon Nov 18, 2019 5:19 am    Post subject: Reply with quote

I was wondering if in cars a radiator cowling aides cooling then would the same do so for our 1100's?
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flybd5
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PostPosted: Mon Nov 18, 2019 6:36 am    Post subject: Reply with quote

K1100Cster wrote:
I was wondering if in cars a radiator cowling aides cooling then would the same do so for our 1100's?


The K1100 already has a cowling around the radiator. You have to remove it to get to the radiator.
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SugarHillCTD
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PostPosted: Thu Nov 21, 2019 6:35 am    Post subject: Reply with quote

The newer folks on this forum have thought about (or even done) the fan switch mod, right?
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flybd5
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PostPosted: Thu Nov 21, 2019 7:22 am    Post subject: Reply with quote

SugarHillCTD wrote:
The newer folks on this forum have thought about (or even done) the fan switch mod, right?


I already bought a new SPAL fan and the adapter to mount it but have not yet done the swap.
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K1100Cster



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PostPosted: Mon Oct 05, 2020 5:46 am    Post subject: oem Reply with quote

Finally bit the bullet and requested a new password, had an update with windows 10 and they left me with nothing in history to keep passwords in. I was thinking of a split shroud behind the radiator with two radiators from a 1200 that would duct air through to the side ports but not over the engine. A new radiator piece would need to be made to replace the existing one so the radiators could be slanted or angled a bit.
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jarnbak
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PostPosted: Tue Jan 19, 2021 4:38 pm    Post subject: Reply with quote

I used a old 3 row k100 cooler on my k1100lt.had to trim the fan bracket.after the mod the fan hardly ever started
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Flying Duck
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PostPosted: Wed Jan 20, 2021 1:18 pm    Post subject: Reply with quote

I put a three core in my K1100RS (which has been ridden in hotter SoCal climates a lot.) It made no difference. Think about it, whether you use a three core or two core radiator it still needs to dissipate the same amount of heat.

The heat issue on K bikes is not caused by the radiator but by the fact that there's nowhere for the heat to go since the area behind the radiator is pretty closed up.
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flybd5
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PostPosted: Wed Jan 20, 2021 1:24 pm    Post subject: Reply with quote

Flying Duck wrote:
I put a three core in my K1100RS (which has been ridden in hotter SoCal climates a lot.) It made no difference. Think about it, whether you use a three core or two core radiator it still needs to dissipate the same amount of heat.

The heat issue on K bikes is not caused by the radiator but by the fact that there's nowhere for the heat to go since the area behind the radiator is pretty closed up.


Cooling is not about the size or configuration of the radiator, it's about how much heat you take away from the engine. The P-51 Mustang engine cooling system is an excellent example of the principles of cooling an engine. Worked perfectly.
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Flying Duck
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PostPosted: Wed Jan 20, 2021 1:53 pm    Post subject: Reply with quote

flybd5 wrote:
Flying Duck wrote:
I put a three core in my K1100RS (which has been ridden in hotter SoCal climates a lot.) It made no difference. Think about it, whether you use a three core or two core radiator it still needs to dissipate the same amount of heat.

The heat issue on K bikes is not caused by the radiator but by the fact that there's nowhere for the heat to go since the area behind the radiator is pretty closed up.


Cooling is not about the size or configuration of the radiator, it's about how much heat you take away from the engine. The P-51 Mustang engine cooling system is an excellent example of the principles of cooling an engine. Worked perfectly.


How long do you think a P-51 engine will last idling in Los Angeles traffic for hours?

K bike engine cooling works quite well as evidenced by the fact that, as long as you are moving, the fan does not come on. As I stated above the issue is that the engine compartment is pretty closed up so once the heat has left the radiator there's nowhere for it to go.
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flybd5
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PostPosted: Wed Jan 20, 2021 2:41 pm    Post subject: Reply with quote

Flying Duck wrote:
flybd5 wrote:
Flying Duck wrote:
I put a three core in my K1100RS (which has been ridden in hotter SoCal climates a lot.) It made no difference. Think about it, whether you use a three core or two core radiator it still needs to dissipate the same amount of heat.

The heat issue on K bikes is not caused by the radiator but by the fact that there's nowhere for the heat to go since the area behind the radiator is pretty closed up.


Cooling is not about the size or configuration of the radiator, it's about how much heat you take away from the engine. The P-51 Mustang engine cooling system is an excellent example of the principles of cooling an engine. Worked perfectly.


How long do you think a P-51 engine will last idling in Los Angeles traffic for hours?

K bike engine cooling works quite well as evidenced by the fact that, as long as you are moving, the fan does not come on. As I stated above the issue is that the engine compartment is pretty closed up so once the heat has left the radiator there's nowhere for it to go.


I was agreeing with you. But since you asked, P-51's don't have problems with cooling on the ground either.
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Flying Duck
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PostPosted: Wed Jan 20, 2021 7:40 pm    Post subject: Reply with quote

A few years ago I brought a K1100LT back to life after it had been sitting for ten years. While I was revamping it I forgot to check fan operation. It took about 6,000 miles of riding for me to discover that the fan was seized. I got stuck in 95 degree weather in Tillamook, OR in some super slow stop-n-go construction traffic and the temperature idiot light came on.

I just turned it off when stopped and then restarted it when I had to move until I made it through that traffic. Put another 1,800 miles on it without issue. When I got home I installed a SPAL fan.

Another story: Was helping a friend do some maintenance on his K1100, he'd stashed a couple of extra credit cards in the relay box in case of emergency. From the heat down there when we pulled them out they were both melted, really warped and completely useless. Evidence that it gets pretty darned hot under the tank.
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SinNH
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Joined: 12 Aug 2006
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PostPosted: Sun Jun 20, 2021 10:50 am    Post subject: thermostat substitute Reply with quote

Hi, cannot find a sub for my 93 1100 stat, would like to get a 170/175 * F.
I did this on my '96 and it seemed to help. ( maybe just a little)
The O'Reilly number 7214-170 is no good anymore.

Anybody running a different make than BMW? ($75.00!!)
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Scott_Anderson
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PostPosted: Sun Jun 20, 2021 1:56 pm    Post subject: Reply with quote

You might check with Auto-Zone. I got one from there a few years ago but didn't like the fit, so I didn't install it, and by the time I tried to fit it I had tossed the receipt so I couldn't return it.
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Jim
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PostPosted: Mon Jun 21, 2021 7:04 pm    Post subject: Re: thermostat substitute Reply with quote

That part number shows up at AutoZone...

https://www.autozone.com/cooling-heating-and-climate-control/thermostat/failsafe-thermostat-7214-170/466681_0_0

Don't know if it's the right one or not.

SinNH wrote:
Hi, cannot find a sub for my 93 1100 stat, would like to get a 170/175 * F.
I did this on my '96 and it seemed to help. ( maybe just a little)
The O'Reilly number 7214-170 is no good anymore.

Anybody running a different make than BMW? ($75.00!!)

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Grunter
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PostPosted: Wed Jun 23, 2021 5:13 am    Post subject: Reply with quote

flybd5 wrote:
Why not make it so the hot air has a place to go by closing the back of the fan, ducting the hot air out the sides and down, and shrouding the rest of the radiator to match? This could also be done by removing the single large radiator fan and installing two smaller ones with ducting down and out.



I think the main problem would be where to place the duct to get the hot air away. The K1100 lump is just that and is tight in the frame. I used to dread having to change the air filter because it was always a fight to get a new one back in. Also the shape of the lower fairing may not have been the best design to allow the flow of air to the radiator.

On the subject of the cooling of 2nd world war piston engine aircraft, the Rolls Royce Merlin when fitted to the Spitfire and Hurricane had a limited time of running before it overheated if take off was not almost immediate. It did not appear to affect the heavy bombers such as the Lancaster because they had a larger radiator.

I used to own one of the early UK Built Triumph Trophy 1200's and they were notorious for having a radiator too small for the engine capacity. Even at 60-70 mph the cooling fan would often cut in to give it a bit of a boost to keep the temperature down. I often wondered had they just fitted the same radiator to the 1200 as they did to the 900 triple, because essentially they were the same bike with a smaller engine with one cylinder less.
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