Stag V8 coolant flow diagram?

[mole42]

I’m looking for a diagram of the designed coolant flow in a Triumph V8 engine. The flow around the radiator is easy to work out, but not the flow around the heads an cylinders.

I’ve done a search but haven’t found a diagram.

[dasadrew]

Klaus Schlueter did a picture of this. He's on a short break at the moment, but I'm sure he won't mind me posting it. Get your German dictionary out and you're away!
Kühlung Stag (Custom).jpg

[Ian P]

coolant

I’m looking for a diagram of the designed coolant flow in a Triumph V8 engine. The flow around the radiator is easy to work out, but not the flow around the heads an cylinders.

I’ve done a search but haven’t found a diagram.

The only one I have is the one from Grampian

http://www.grampianstags.net/Stag%20engine/water-pump.htm

[mole42]

German dictionary not required - I did live near München for two years....

But what I’d like to see is the Triumph design drawing for coolant flow, not someone’s idea of what it might be.

There are many ideas about how the cooling might be improved on the Stag V8, I’m interested to see what was supposed to happen before I make any “improvements”.

My engine cools perfectly well unless it’s stationery in traffic and then the temperature rises until I switch on the electric fan.

[dasadrew]

I think the "someone's idea of what it might be" are actually "someone's documented observation of how it is" !

However, I'd be surprised if the original Triumph design drawings represent "what was supposed to happen" as there are quite a few coolant passages in the block which end up in a dead end at the cylinder head or a vastly reduced 'restrictor' hole in the head gasket, so it seems that "what was supposed to happen" was determined to be wrong at a very early stage (or it was determined that the heads couldn't be made with the passages which the designers wanted.) and several hurried bodges were then applied in a desperate attempt to make it work.

Drew

[Lingen]

Mole.
That suggests to me that the viscous coupling is getting tired, and the fan isn't shifting enough air. If switching on the electric fan on gets things back to normal, there can't be much else amiss.
Mike.

[flying farmer]

It is worth checking for gaps between the radiator and the radiator mounting panel.

Last Sunday at the Dearnford lake classic car meet I was talking to a fellow Stag owner with cooling problems and there was a gap of at least an inch all round the radiator (he was also missing the cold air duct to the carb at the top of the rad)
Nett result is lots of hot air dragged around the sides of the rad which buggers the cooling. Had an identical problem on a Dolomite Sprint which needed the gaps filling with aluminium plate to fix the problem.
Rubber boot or tailgate seal from my local scrappy filled the gaps on mine, nicely pushes over the edge of the radiator mounting panel.
Neil

[jakesmig]

.......................

My engine cools perfectly well unless it’s stationery in traffic and then the temperature rises until I switch on the electric fan.

Try advancing the timing by a couple of degrees, the rise in temperature at idle may slow down and not be such a concern.

My RV8 temperature also rises at idle and the fan occasionally switches on for a while so it isn't only the lesser engine which shows this trait. Have to say it doesn't upset me enough to try and solve it, I think bringing about peace in the Middle East would be easier.

John.