Electric water pump vs flywheel driven

Dabbling with the idea of a water cooled head.

My bike has 6v but can convert that to 12v easily with around 40w spare.

My gut instinct is telling me electric driven pump save placing more drag on the end of my crankshaft

Re: Electric water pump vs flywheel driven

Electric pump is the way to go. Less chance of failure and also much cheaper too. You can find a nice Bosch aux water pump from a Benz, VW, Audi or BMW at a junk yard for under 20 bucks. The w123 Benz has is right behind the passenger headlight just asking to get ripped out.

Re: Electric water pump vs flywheel driven

Lectric

Re: Electric water pump vs flywheel driven

also the plumbing is way nicer and you can mount them down low where they wont get air bubbles in them.

even if you bleed the whole system it will still get air bubbles in it from outgassing and whatever else so its always best to have the pump be the lowest point in the system

Re: Electric water pump vs flywheel driven

Cool thanks for the tips, I’m looking at a yz250 radd just the one as they run two rads.

Still undecided where to mount it though. Possibly at the rear of the bike or high up behind the headlight/in front of the bars

Re: Electric water pump vs flywheel driven

> Adam Smith Wrote:

> -------------------------------------------------------

> Cool thanks for the tips, I’m looking at a yz250 radd just the one as

> they run two rads.

>

> Still undecided where to mount it though. Possibly at the rear of the

> bike or high up behind the headlight/in front of the bars

I run a RM 65 radiator on my derbi off to one side. It would be good if you could mount it centered under the gas tank.

Re: Electric water pump vs flywheel driven

> Stephen Simmons Wrote:

> -------------------------------------------------------

> > Adam Smith Wrote:

>

> > -------------------------------------------------------

>

> > Cool thanks for the tips, I’m looking at a yz250 radd just the one as

>

> > they run two rads.

>

> >

>

> > Still undecided where to mount it though. Possibly at the rear of the

>

> > bike or high up behind the headlight/in front of the bars

>

> I run a RM 65 radiator on my derbi off to one side. It would be good if

> you could mount it centered under the gas tank.

https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fulk%2Fitm%2F172690137792

Something larger like this would be awesome.

But I think you’re right under the tank would be great I’m just thinking something smaller like this tank might fit

https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fulk%2Fitm%2F400437006429

Re: Electric water pump vs flywheel driven

> Graham Motzing Wrote:

> -------------------------------------------------------

> also the plumbing is way nicer and you can mount them down low where

> they wont get air bubbles in them.

>

> even if you bleed the whole system it will still get air bubbles in it

> from outgassing and whatever else so its always best to have the pump be

> the lowest point in the system

I air locked my pump badly and it took a good while to figure it out. Short of rearranging the entire system which I eventually did I had to stand the bike up on end to bleed it fully and like you said I eventually caught a bubble again.

Re: Electric water pump vs flywheel driven

This is how mine is set up and I've never had a problem. My pump went out once and it still didn't go over 234° blasting. It doesn't go over 196° while blasting with the pump working. It cruises at 165-180° normal riding depending on temperature outside.

IMG_20181002_150222.jpg
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