Thread: Puma 2.2 Egt's

This is what happens when the simplistic nature of "but water boils at 100c at sea level" learnings are applied to automotive applications.. which has been inconsequential since the first pressurised cooling system.

Ford Barra motors don't kick off until well over 118c (I had a worked Barra, that on a 40c day driven hard was pushing 120c+) and never have a problem...

That's what the glycol mix and pressure cap are there to control..

It's also what allows you to drive up Mount Kosciuszko etc (or even higher in say the USA) and back to sea level without engine problems..



http://www.engineeringtoolbox.com/bo...de-d_1344.html

Tombie, as usual excellent info. Thanks mate

100 degrees is no problem. I've sat on 110km/h all day in flat open country with air temp of about 35 and the coolant just sat at 100 and wouldn't budge.

We don't need 50/50 glycol in ths country though. The vehicles are shipped out with the ability to handle the coldest climates.

A 70/30 concentration still gives antifreeze protection to about -20 and does bugger all to the boiling temp. Most importantly it will increase the "capacity" of the cooling system which will mean temps should stay more stable and not be beyond the control of the thermostat as often.

Not quite....

Dropping to 30% Glycol mix drops boil-over to 121c at Sea level...

50% Glycol sees it at 129c and is the recommended blend globally - optimum balance of corrosion protection and life as well as cooling...



The only thing the lighter mix does is improves its Specific Heat Capacity as you mentioned.

Id love to know what some other members are getting in regards to egt.
Maybe a list of mods which could affect egt:
2.2 or 2.4:
Location of probe (pre turbo after turbo):
Tyre size:
Tune (standard or ....?):
Intercooler:
Exhaust mods:
Snorkel;
Max egt seen:

It would be great to get some figures if we could, would be a valuable resource for those looking at possible modifications.

[quote=Tombie;2635673]Not quite....

50% Glycol sees it at 129c and is the recommended blend globally

Of course they recommend that, because it's sufficient for a broad temperature band. Doesn't mean its the best for every situation.

- optimum balance of corrosion protection and life as well as cooling...

Yes its a good balance. But definately not optimised for a hot climate.
Corrosion inhibitors can be added manually to a weaker glycol solution.

The only thing the lighter mix does is improves its Specific Heat Capacity as you mentioned.

Thats the whole idea.

Dont have an egt sensor but I do monitor temp through a HUD plugged to the obd 2.

During my recent VIC high country trip with a fully laden car I had the following observation:

2.2
No probe
Tyre size: 285/75 R16 BFG KM2
Tune: BAS 170 AB
Intercooler: BAS
Exhaust mods: D-CAT
Snorkel: Safari with standard paper filter
Normal coolant temp is around 89 (even at sustained highway speeds *20 ). The temp did climb going over the mountains in low range when the going was very slow to about 97 for a short period of time.

My Truck by the Way:

Corrosion inhibitors can be added manually to a weaker glycol solution.

What manually added corrosion inhibitors???