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1Back to top Go down   Fuel Heat Exchanger Empty Fuel Heat Exchanger on Sun Oct 30, 2011 7:38 am

bushyintas

bushyintas
Silver member
Silver member
Hi all.

This might be of some interest to those of us in the wasmer parts of hte world,

A fuel heat exchanger that cools the returning fuel, from the fuel rail just before it is returned to the tank.

Only one test ride so far but a marked reduction in the temp of the fuel in the tank that can be felt at your knees.

On using a laser thermometer on the start of the fuel return line, at the end of the fuel rail, measured approx 60 deg C and at the point where the fuel line returns to the tank only 24 deg C.

I will conduct further tests both with the inlet to the exchanger covered, take a reading of the temp of the fuel in the tank, uncover then immediately re ride the same route with the inlet open and retest.

I will post findings here when completed.

Regards Bushy.



See photos below.

Fuel Heat Exchanger Heat_e10

left top, heat Exchanger with "Heat Shield " tubing..... right top, inlet hole cut in radiator cowl.

left bottom, installed exchanger..... right bottom, hole from inside with mounting clips.



Fuel Heat Exchanger 4_x_k110

Completed project over winter 2011 here in Tassie.

    

2Back to top Go down   Fuel Heat Exchanger Empty Re : Fuel Heat Exchanger on Sun Oct 30, 2011 8:13 am

Dennis

Dennis
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Nice one Bushy, the 'ol Tassie ingenuity coming through there, well done. Just make sure the copper doesn't cop any vibration to avoid work hardening, wouldn't like to see the fuel spraying back towards the hot pipes. Should keep the fuel tank a bit cooler, especially in summer.

    

3Back to top Go down   Fuel Heat Exchanger Empty Re: Fuel Heat Exchanger on Thu Nov 03, 2011 1:52 am

K-BIKE

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Good on you Bushy, really interesting especially because you took measurements, top stuff, well done!
Regards,
K-BIKE

    

4Back to top Go down   Fuel Heat Exchanger Empty Re: Fuel Heat Exchanger on Thu Nov 03, 2011 7:14 am

charlie99

charlie99
VIP
VIP
well done bushy .....nice results ...and congrats


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OFuel Heat Exchanger Au-log10

'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
    

5Back to top Go down   Fuel Heat Exchanger Empty Re: Fuel Heat Exchanger on Thu Nov 03, 2011 7:59 am

RicK G

RicK G
admin
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Damn good thinking there Bushy it certainly works well but (and there is always a but) how come you used copper and not aluminium was it that copper was what you had


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

6Back to top Go down   Fuel Heat Exchanger Empty Re: Fuel Heat Exchanger on Fri Nov 04, 2011 4:04 am

bushyintas

bushyintas
Silver member
Silver member
I had the copper in the shed, aluminium would have been easier to turn in the lathe. Soldered the elbows both top and bottom, not possible with aluminium.

Mark II is on the cards, aluminium with turned ends for connection to the hoses. Will add to this post when done.

Regards Bushy.


__________________________________________________
Bushy

k100 RT 1988 #0095723
K100 RT 1984 into Custom Single seat.  #0024503
    

7Back to top Go down   Fuel Heat Exchanger Empty Re: Fuel Heat Exchanger on Fri Nov 04, 2011 4:36 am

Toto_jp

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Thats a good idea Bushy . Used to have a compressor made in India with cooling tubes covered with aluminium washers .......... when the paint came off them discovered they were made from coke cans .... wonder if your system could be used to cool the fuel before it enters the fuel rail to give more bang for your buck Smile


__________________________________________________
K100 RS 1986
    

8Back to top Go down   Fuel Heat Exchanger Empty Re: Fuel Heat Exchanger on Fri Nov 04, 2011 5:32 am

bushyintas

bushyintas
Silver member
Silver member
I thought of trying to use it before the fuel rail but since its under pressure before the rail I didn't want to tempt fait with a failure, spraying fuel everywhere, after the rail on the return line, no pressure as fuel is returned to the tank.

I'm just trying to lower the temp of the tank to make it more comfortable during the warmer months of the year.


__________________________________________________
Bushy

k100 RT 1988 #0095723
K100 RT 1984 into Custom Single seat.  #0024503
    

9Back to top Go down   Fuel Heat Exchanger Empty Re: Fuel Heat Exchanger on Fri Nov 04, 2011 5:46 am

charlie99

charlie99
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yep a really good idea bushy ...i noticed last summer ....even just the aircon piping insulation made a huge difference .....went from being in the high 50s to the low 30s ...comparitivly ...but as i idle round town the temp still creeps up .....it would be nice to have a cooling affect as well ..as soon as speed is acheived .

ive got my eye on a after market oil cooler (about 8 mm tubing 3 flat turns in aluminium fins about 6 inches by 3 inches by about an 1 inch thick ) and cheep as ....i had thought of cutting the front radiator fairing like you have, to provide air flow .....i now have a backup original fiber glass bit for experimentation now ....and summers on the way "big time" up here ...



thats way crazy.... hey toto?....trust the indians to use whats around ....inventive ?!!!

    

10Back to top Go down   Fuel Heat Exchanger Empty Re: Fuel Heat Exchanger on Fri Nov 04, 2011 6:34 am

BIG D

BIG D
Life time member
Life time member
Cool

Thats first class workmanship there bushy, a job well done.

BIG D

    

11Back to top Go down   Fuel Heat Exchanger Empty Re: Fuel Heat Exchanger on Fri Nov 04, 2011 9:18 pm

bushyintas

bushyintas
Silver member
Silver member
Had the same idea as you Charlie but looked at placing it between the radiator and the front grill, plumbing it through the left side, maybe your oil cooler would fit there?

bushy


__________________________________________________
Bushy

k100 RT 1988 #0095723
K100 RT 1984 into Custom Single seat.  #0024503
    

12Back to top Go down   Fuel Heat Exchanger Empty Re: Fuel Heat Exchanger on Sat Nov 05, 2011 6:24 am

charlie99

charlie99
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VIP
hmm not a bad idea bushy ...but i have other plans ....about under tank cooling just at the top of the radiator i have made a mould to construct a ram vent up into the under tank area ,,,,,,,,to get rid of the thigh burns that we tend to suffer out here ....

but thinking about it, the little radiator could mount on the left side like your hole huh (but i really didnt want fuel "out front " just in case )

.....hmmm food for thought mate ....cheers

keep at it bushy ....your doing well !!!


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OFuel Heat Exchanger Au-log10

'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
    

13Back to top Go down   Fuel Heat Exchanger Empty Re: Fuel Heat Exchanger on Sat Nov 05, 2011 7:05 am

ReneZ

ReneZ
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Why don't look at an oil cooler as used on the k1200?


__________________________________________________
Greetings from Florida! Having a 'new' K  :cyclops:    Surprised-o: 

Rene


BMW K100 - 1985 (0030029) Fuel Heat Exchanger Rain
BMW K1200GT - 2003 (ZK01223)
    

14Back to top Go down   Fuel Heat Exchanger Empty Re: Fuel Heat Exchanger on Sat Nov 05, 2011 2:35 pm

robmack

robmack
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Life time member
@ReneZ wrote:Why don't look at an oil cooler as used on the k1200?
Just wondering if a small after-market oil cooler like this will work?

Fuel Heat Exchanger 740-502_A

What I'm not certain about ii if there are special precautions to take with the design to maximize fuel flow and minimize potential leakage problems. The unit above is 1" thick by 5" long and steel construction which seems to be large enough to do the job. I'm thinking that the "U" shaped tube will not be a problem in this application.


__________________________________________________
Robert
1987 K75 @k75retro.blogspot.ca
http://k75retro.blogspot.ca/
    

15Back to top Go down   Fuel Heat Exchanger Empty Re: Fuel Heat Exchanger on Sat Nov 05, 2011 2:40 pm

charlie99

charlie99
VIP
VIP
verry similar to what i have seen rob ...good find !


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OFuel Heat Exchanger Au-log10

'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
    

16Back to top Go down   Fuel Heat Exchanger Empty Re: Fuel Heat Exchanger on Sat Nov 05, 2011 6:23 pm

K-BIKE

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The other possible source for mini coolers is the bike breakers yards and pick up one of the small oil coolers being fitted to modern bikes. Seriously looking at the picture I assumed it was a commercial unit it looks so well made, just like a bought one as they say.
Regards,
K-BIKE

    

17Back to top Go down   Fuel Heat Exchanger Empty Re: Fuel Heat Exchanger on Sun Nov 06, 2011 12:11 am

Albyalbatross1

Albyalbatross1
Life time member
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After reading about this and taking what charlie had to say i went for a look. Anyone seen These or these aussie go cart fuel COOLERS

    

18Back to top Go down   Fuel Heat Exchanger Empty Re: Fuel Heat Exchanger on Sun Nov 06, 2011 1:53 am

bushyintas

bushyintas
Silver member
Silver member


__________________________________________________
Bushy

k100 RT 1988 #0095723
K100 RT 1984 into Custom Single seat.  #0024503
    

19Back to top Go down   Fuel Heat Exchanger Empty Re: Fuel Heat Exchanger on Sun Nov 06, 2011 1:00 am

bushyintas

bushyintas
Silver member
Silver member
sorry if link does not work look at this,

Fuel Heat Exchanger Heat_e12



regards Bushy

    

20Back to top Go down   Fuel Heat Exchanger Empty Re: Fuel Heat Exchanger on Mon Nov 07, 2011 7:11 am

col

col
Life time member
Life time member
seen them on race karts
doesnt help make them go any quicker
looks good and the bloke at the local kart shop making a killing out of them
he uses on on his sons kart and always wins so everyone buys what ever on his kart
money can only make you go so fast the rest is the skill of rider /driver


__________________________________________________
1991 k100lt "the enterprise"
    

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