Running without coolant?
 

Have just replaced coolant with plain water and wondering about over heating etc?

How much quicker will it overheat?

Any other implications?

I assume we're talking about the water filled radiator here?

The only difference to my knowledge is that coolent contains antifreeze to prevent your radiator from freezing and thus splitting due to expansion over the winter months, and it is distilled water which prevents algae build up.

Shouldn't find any other differences in terms of cooling.


[Edited on 28-8-2005 by 748IOM]

I reckon you'll be fine, should make no difference.

Not true I'm afraid. Coolant does two things to water. It lowers the freezing point and raises the boiling point. Thus at the freezing point of water, the coolant is still fluid, as it is at the boiling point of water and therefore with just water in the system, the temperature will rise significantly quicker.

With a 50-50 mixture of water and antifreeze, the coolant's boiling point can be raised to around 130°C

You wouldn't want to get caught in traffic on a hot day with just water in your rad...

Rich

[Edited on 28-8-2005 by Richd]

Agree with Rich. The cooling efficiency is improved by the anti freeze as is the anti corrosion properties.
I only use 50/50 anti feeze/distilled water in the cooling system. Best combination of all the properties available.
The corrsion problem can be a problem. There's a mechanical seal behind the pump impellor and as the corrsion builds, and it does at an alarming rate, it'll eat away at the seal. When it goes, the coolant goes straight into the engine...........
If you're thinkin of water only for track use, then use distilled water and flush the system regularly. I wouldn't bother at all for the road.

what would you know ??? :frog:
















;)

I've seen engines that have been run on plain water where the corrosion has eaten its way right through the block and into the combustion chamber. Drain it after each race and leave it empty till the next time and it should be okay.

[Edited on 28-8-2005 by rockhopper]

Or .... race an air cooled bike ;)

its not a long term thing, will probably be back with coolant within a few weeks, just wondering if I wanted to take it for a test ride how it would be if i hit traffic.

Mind you, all that is now hypothetical as I stripped the clutch down today to repack it only to find the reason it was slipping was probably due to the spider spring being in two pieces and the nut somewhat loose as a result :(

More maintenance required tomorrow in form of replacement basket (I hope) and rebuild in the hope it is slightly better!

It's your call Lily but I personally wouldn't risk it just for the sake of sticking the right measure of coolant in it.
I made same mistake a long time ago with a car engine and found it overheated and very quickly.

Alan

I can't have coolant in it, hence why I have drained it for now!

Sorry Lily, I thought the original quote was you'd replaced the coolant with water.

[Edited on 28-8-2005 by guest1]

Yes, have drained all coolant and topped it back up with water for now. Will put coolant back in a few weeks :D

Alan, race bikes ( and bikes used on certain foreign trackdays) are not allowed to run anything other than plain water in the cooling system as antifreeze is seriously slippery if it gets split on the track after a crash.

which is probably why, amongst other reasons, race bikes are more prone to overheating........? :eureka:

related issue: have only had my 748 for a few days and as my last one was nocked after 3 weeks, i didn't get much chance to get to know it, so was just wondering if its coolant temp was normal. in town it goes up to 210 but no further, whilst on the move it stays around 180. is this normal? i just noticed today that the coolant level is low (below minimum - can just see a bit of blue in the bottom of the coolant tank if i look through the forks from the front). naturally, i'll be beating down the door of halfords tomorrow morning!

:D just read the link which answered my question perfectly!

Although having said that, i dont think Yeti did anything to his bike when it took it to a foreign trackday earlier this year.