Author Topic: moving radiator under seat on k100  (Read 6426 times)

Offline Roland

  • ^ Motobrick Curious
  • Posts: 65
moving radiator under seat on k100
« on: July 01, 2017, 11:19:20 PM »
has anyone seen a k100 with the radiator in a different location? I know the jj cobas one but i was thinking either under the seat of in between the frame where the battery sits. thank you

  • California
  • 1985 k100rt

Offline Martin

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Re: moving radiator under seat on k100
« Reply #1 on: July 01, 2017, 11:59:41 PM »

Radiators are placed at the front of vehicles, cars, trucks, and motorcycles to get the benefit of maximum air flow. However if you can still maintain cooling there is nothing to stop you placing it wherever you like. It is also possible if you don't have room to use a split radiator and mount half on either side. I can vaguely remember someone installing a custom radiator in the belly pan ( not a Brick).
Regards Martin.
  • North Lakes Queensland Australia
  • 1992 K75s Hybrid, Lefaux, Vespa V twin.

Offline Laitch

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Re: moving radiator under seat on k100
« Reply #2 on: July 02, 2017, 12:03:09 AM »
Please post some photos of this project of yours, Roland. It sounds interesting.
  • Along the Ridley in Vermont.
  • 1995 K75 89,000 miles

Offline The Dude

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  • Posts: 509
Re: moving radiator under seat on k100
« Reply #3 on: July 02, 2017, 01:47:28 AM »
There is a depression(pressure drop)in the rear wheel arch that can be used to draw air through a radiator efficiently enough when positioned under the seat.The Britten used this knowledge.Should keep you're arse cool too.
Edit:second thoughts,might make you're arse hot.
  • Auckland, New Zealand
  • K75s
Current.
TR6R 1973 from new.
Moto guzzi 850 III .1983 from,almost, new.
K75S 1986 from new.vin-0103141
On my second millionth km.give or take a hundred k Kay's.
"The Dude abides. I don't know about you but I take comfort in that. It's good knowin' he's out there."
All the best!

Offline Laitch

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Re: moving radiator under seat on k100
« Reply #4 on: July 02, 2017, 02:14:02 AM »
The Britten. The two scoops in the front cowl are radiator ducts.

* The Britten, from CycleWorld.png (477.15 kB . 587x361 - viewed 702 times)
  • Along the Ridley in Vermont.
  • 1995 K75 89,000 miles

Offline rbm

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Re: moving radiator under seat on k100
« Reply #5 on: July 02, 2017, 09:41:34 AM »
Moving the radiator to the rear of the bike is possible; I've seen it done to a K75.  It requires a custom radiator and fan combination to ensure it fits in the space at to allow for the routing of hoses from the engine block to the rear of the bike.  It also requires a specialized inline thermostat and housing.  Since the space where the central triangle brace of the frame is completely occupied by the radiator, the ECU, overflow tank, and battery have to move.
  • Regards, Robert
Toronto, Ontario

1987 K75 - Build Blog @http://k75retro.blogspot.ca/

Offline Roland

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  • Posts: 65
Re: moving radiator under seat on k100
« Reply #6 on: July 02, 2017, 02:11:55 PM »
ecu is not a problem since we put a carb on the bike. I was thinking the battery could go under the seat on under the tank in the front. Where would i get an inline thermostat? where could i get a costom radiator? thank you all for replying

  • California
  • 1985 k100rt

Offline F14CRAZY

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Re: moving radiator under seat on k100
« Reply #7 on: July 04, 2017, 11:24:15 AM »
With all the F-ing heat it throws I thought about mounting it on top of the top case
  • Grand Rapids, MI
  • '87 K75C
'87 K75C w/ Pichler V1 fairing. LED's, CATZ driving lights, Audiovox cruise, LT top case, tons of other mods by Drake...


Offline Laitch

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Re: moving radiator under seat on k100
« Reply #8 on: July 04, 2017, 11:33:10 AM »
ecu is not a problem since we put a carb on the bike.
How about posting some photos of this critter, Roland?
  • Along the Ridley in Vermont.
  • 1995 K75 89,000 miles

Offline Roland

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  • Posts: 65
Re: moving radiator under seat on k100
« Reply #9 on: July 04, 2017, 09:23:27 PM »
I will start one when i get alittle futher along. We are still in the process kf figuring out how to make a tank. Aluminum or fiberglass. But here is a teaser. This is a pic of the intake we made.
  • California
  • 1985 k100rt

Offline Laitch

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Re: moving radiator under seat on k100
« Reply #10 on: July 04, 2017, 11:21:07 PM »
I will start one when i get alittle futher along. We are still in the process kf figuring out how to make a tank. Aluminum or fiberglass. But here is a teaser. This is a pic of the intake we made.
It's ok if you don't have a bike. There's no shame in that. You've got a carburetor, intake manifold and a dream. That's the start of a project. A handlebar would be a good fourth acquisition. Post a photo when you get one.
  • Along the Ridley in Vermont.
  • 1995 K75 89,000 miles

Offline Elipten

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Re: moving radiator under seat on k100
« Reply #11 on: July 05, 2017, 12:24:37 AM »
This is looking interesting!   Got my attention.


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  • San Antonio, TX
  • 1990 K75RT

Offline Roland

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  • Posts: 65
Re: moving radiator under seat on k100
« Reply #12 on: July 05, 2017, 12:35:27 AM »
The bike...
  • California
  • 1985 k100rt

Offline Laitch

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Re: moving radiator under seat on k100
« Reply #13 on: July 05, 2017, 12:48:40 AM »
The bike...
Well so it is! Thanks for the photo, Roland.
  • Along the Ridley in Vermont.
  • 1995 K75 89,000 miles

Offline The Dude

  • ^ SuperNatural Motobricker
  • Posts: 509
Re: moving radiator under seat on k100
« Reply #14 on: July 05, 2017, 03:15:46 PM »
You're fuel mixer looks very "steem Punk"I like it!(is that how you spell steem?,it's been a while.)
your fuel tank mod's a bit extreme and the nice shock angled away from direction of its function is a laugh at engineering principles.Ah,who cares?
Finishing can be an anticlimax.I hope it works out....
  • Auckland, New Zealand
  • K75s
Current.
TR6R 1973 from new.
Moto guzzi 850 III .1983 from,almost, new.
K75S 1986 from new.vin-0103141
On my second millionth km.give or take a hundred k Kay's.
"The Dude abides. I don't know about you but I take comfort in that. It's good knowin' he's out there."
All the best!

Offline Roland

  • ^ Motobrick Curious
  • Posts: 65
Re: moving radiator under seat on k100
« Reply #15 on: July 05, 2017, 03:26:06 PM »
This is the shock done
  • California
  • 1985 k100rt

Offline The Dude

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  • Posts: 509
Re: moving radiator under seat on k100
« Reply #16 on: July 05, 2017, 06:23:06 PM »
You may have had good reason to sort this area out better than standard as I had to from my fatigue failures I had on both sides in the shock mount in the bent area in the frame.The thin gusset the shock mounted to had cracked and also the tube on the other side of the bike.I put a plate over it and welded the gussets above the bend both sides of the bike.Some of our roads are shit but the brick can fly over them on the straights.
I figured it was the beer stored in the tail that did it. :riding:
  • Auckland, New Zealand
  • K75s
Current.
TR6R 1973 from new.
Moto guzzi 850 III .1983 from,almost, new.
K75S 1986 from new.vin-0103141
On my second millionth km.give or take a hundred k Kay's.
"The Dude abides. I don't know about you but I take comfort in that. It's good knowin' he's out there."
All the best!

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