Cooling fans

The Great Pretender · Post by **The Great Pretender** » Mon Mar 10, 2008 1:45 am

Thanks Dandy, now I need to find my mm to centigrade conversion table

coco bongo · Post by **coco bongo** » Mon Mar 10, 2008 12:25 pm

I think this one will be personal preference, and if my mechanic says it wouldnt hurt as long as it's not forgotten, I will go with him.

Beside's it's only one more thing to think about. Do we forget to use signals properly?, or does a pilot forget to turn the landing lights on?. Not when you get used to it.

mikeonb4c · Post by **mikeonb4c** » Mon Mar 10, 2008 2:39 pm

I'm assuming also (1) that the live feed is an ignition based feed so engine off, fan off. I'm also hoping it will be audible when stationary so further reducing scope for leaving it on.

coco bongo · Post by **coco bongo** » Mon Mar 10, 2008 2:48 pm

That's the plan! key off, fan off. If you really want to cool her down after a journey, you'll have to stand there like a berk and wait

.

Just done phase one of the coolant alarm, too windy and wet to do the tank probes!!. A doddle to fit (so far anyway).

dandywarhol · Post by **dandywarhol** » Mon Mar 10, 2008 3:59 pm

coco bongo wrote:I think this one will be personal preference, and if my mechanic says it wouldnt hurt as long as it's not forgotten, I will go with him.

Beside's it's only one more thing to think about. Do we forget to use signals properly?, or does a pilot forget to turn the landing lights on?. Not when you get used to it.

Going by the number of times I forget to cancel my bike's indicators I wouldn't trust myself having to remember anything - NURSE! Have I had my tea yet

coco bongo · Post by **coco bongo** » Mon Mar 10, 2008 9:14 pm

That bad is it dandy!

ronhud · Post by **ronhud** » Tue Mar 11, 2008 12:05 pm

Tried Dandys tip to check the rad fan. First - when I put the aircon on (heating fan turned on too) then the rad fan works and from the bonnet its very clear from the noise that it is on!

I ran the engine at 2000rpm for 5 mins and not a great deal of movement on the temp gauge( mason fitted). I ran for another 4 min and by then the needle was about 80% across the range. Mason buzzer set at 4 and not sounding - rad fan not on.

What do I deduce from this :-
a) rad fan needs much higher engine temp to come on
or
b) sensor from engine temp to rad fan may not be functioning

I could keep on running at 2000 rpm until it gets really hot but I dont want to take a risk. Does anyone know where the sensor and connectors are that actuate the fan according to engine temp?

Ron

The Great Pretender · Post by **The Great Pretender** » Tue Mar 11, 2008 10:44 pm

Does anyone actually monitor the water temp with an acurate gauge?
The reason for asking is that the heat exchanger on my veg oil conversion is not reaching the expected temp. So today I fitted a gauge on the outlet hose and was very suprised.
The thermostat was open at under 40c and the Bongo gauge was at 11 oclock by 45c and never moved.

dandywarhol · Post by **dandywarhol** » Wed Mar 12, 2008 10:15 pm

Sorry folks - a bit of miss info in my previous post re. temp gauge reading.

After it had warmed up, I ran mine tonight (6 deg. C outside) for around 7/8 minutes at 2500 rpm and the gauge reached up to about 2 needle thicknesses before the last mark on the gauge before the fans came on.

The workshop manual says the cooling fans come in at 108 deg C and the scavenger fan at 180 deg. C

coco bongo · Post by **coco bongo** » Thu Mar 13, 2008 12:11 am

Blimey! scavvy fan at 180

Well the override is next Saturday's job along with an oil change

Will let you know how it turns out, i will try and post photo's if i remember to take my camera. Bang goes my weekend lie in

dandywarhol · Post by **dandywarhol** » Thu Mar 13, 2008 12:28 am

Life's a lot cooler in a manual Bongo Coco - it's only 171 deg.C

The Great Pretender · Post by **The Great Pretender** » Thu Mar 13, 2008 12:31 am

coco bongo wrote:Blimey! scavvy fan at 180

Well the override is next Saturday's job along with an oil change

Will let you know how it turns out, i will try and post photo's if i remember to take my camera. Bang goes my weekend lie in

Remember 180c isnt water temp it is air temp, how much do you think the exhaust manifold contributes to it?
But I must admit if the Bongo is stationary and the main fans are on it would make sense if the scavenge was on to.

mikeonb4c · Post by **mikeonb4c** » Thu Mar 13, 2008 12:38 am

coco bongo wrote:Blimey! scavvy fan at 180

Well the override is next Saturday's job along with an oil change

Will let you know how it turns out, i will try and post photo's if i remember to take my camera. Bang goes my weekend lie in

Watching this thread with great interest Coco - good luck

coco bongo · Post by **coco bongo** » Thu Mar 13, 2008 12:51 am

Well all's i know is it's preeettyy hot in there, you'd certainly be able to revive your fish and chips in the engine bay.

It's a good, cheap way of helping your mota out though. Especially when the summer comes, aint that far away.

coco bongo · Post by **coco bongo** » Thu Mar 13, 2008 12:57 am

mikeonb4c wrote:
Watching this thread with great interest Coco - good luck

Cheers Mike, it's your idea after all in all it's simplicity. All credit goes to you and Dandy of course.

Will give it a damn good bench test on saturday 22nd, and post in the evening on my findings.

That'll burn up my £20 worth of diesel a bit