Bongo Fury

bigdaddycain wrote: I'm not 100% convinced about the pocket of air in the pump spinning it up perhaps causing a rattle.
Don't know myself either, but the link Geoff put up suggests '...noise and damage....'
Firstly would a pocket of air not be dissipated into bubbles as it was drawn into the pump? Agree
Reduced mass of the bubbled (cavitated) coolant may cause the pump to spin quicker (internal pressure must alter also)
Technically yes because for a given throttle position, if the pump is pumping air instead of coolant, there is less energy used and more available for driving, which in turn would cause a slight increase in road speed, causing the engine speed to increase and hence the pump to rotate faster.
Practically, this increase in speed would not be quantifiable. The pump speed is totally governed by the drive belts (engine speed).
But surely this would be VERY quick? Not enough to make even a mason alarm adjusted gauge shoot up?
That's the bit I don't get cos this Bongo gauge (unmodified) shot up, and then back down when the rattle stopped
how long has the bongo been in this country?
Don't know
Do you know what coolant it had in it, and what coolant is in it now?
Red stuff - before and after (I think) Perhaps the owner could advise.

widdowson2008 wrote:Not done one of these for a while, and Ady can NEVER remember which way round the pump rotates, so, here we go.
Hope you understand the flow

IN flow is from the thermostat
OUT flow is to the engine (first port of call is the engine oil cooler)

widdowson2008 wrote:

bigdaddycain wrote:

widdowson2008 wrote:

No antifreeze? Couldn't say. Would no a/freeze create this sort of marking? I dunno

Hi Steve, i've only just re-discovered this thread, i'm about to read the rest of it now...

I've never seent the innards of a pump "in the metal" as it were... I suggested no antifreeze as the inner chamber looks like it's been stained by rusty water. (maybe they all look that way after a while? Dunno!)

Hi Ste
Not stained as such, more like a coating - scratches off easily back to base metal. Very similar to that cylinder head I chopped up recently.

haydn callow wrote: I think you will find that is the protective coating laid down when new coolant is introduced. This coating should not be disturbed/damaged as I understand it protects the internals from errosion caused by cavitation bubbles.......this coating seems much more substantional from Red long life coolant.