Jowett 10/4 running temperature

[nigel jarrett]

Being fairly new to the thermo syphon cooling system what would be the normal acceptable running temperature once warmed up .Mine runs between 80-92deg C depending on whether you are going up hill or down hill .Is this the norm.

[Keith Clements]

I would first check the gauge either against a known good thermometer but perhaps with an infra red thermometer. The electronic type can also easily measure the head temperature so telling you if the syphon is moving enough coolant. The ambient temperature must be the same if doing a comparison. If the system has coped with the 30 deg plus we have had recently then I would not worry.

[Tony Fearn]

Hi Nigel.
'Mary Ellen' also 'benefits' from the thermo-syphon set-up.
There is no temperature gauge on the dash panel, so precise degrees of heat aren't known.
Some years ago I fitted a calormeter to a radiator cap and it stood proud at the front of the bonnet.
This had a little built-in pointer, and the arc it covered showed 'cool', 'normal', and 'boiling'.
It was quite stressful watching the temperature rise as we plodded up a hill, so I removed it.
I now wait for the boiling water to spray out horizontally from under the radiator cap, but it hasn't done so yet!
Anyway, 92 degrees is a long way from boiling!
Have a look at:- http://www.mcgillmotorsport.com/7-unive ... sible-976/
Tony.

[Keith Clements]

Water temperature is not as important as oil temperature. The car should be Ok on full load at 100c provided the oil remains below 110c. 82 c is acceptable normal header tank temp. Head temp may well sit at 95c.