[urq] Evans Coolant

[Robert A Dupree]

Isn't the rule of thumb that oil-creeps-water eg: are you perhaps running insufficient oil cooling for the application where the thermal efficiency of the radiator has been compromised due to obstructed air path?  I know you're running the stock V8 oil-cooler in that modified front facia, but is it even running as efficiently as it does in a V8 application?

Assuming the oil-cooler under rear-spoiler isn't an option for you in a testing model to see a benefit - could you change out to a monster oil-cooler, or minimally ensure that 100% of the incoming air to your V8 O-C has to pass through the heat-exchanging surface, and then has an efficient exhaust path?  I'm thinking like a reverse air-vent to path the air under the motor toward a low pressure zone somewhere.

Ultimately restoring the efficiency of the radiator is probably simpler if a chemical change can do that - but I'm skeptical that there is much to be gained by a fluid that rejects heat faster (higher total heat capacity) to the radiator, to the exchange air - when fundamentally the exchange-air is the problem.  It would seem you would have even hotter-air potentially still trapped and not flowing.  Now a radical option based on what I remember of your beastie from UrQ25 would be exhaust out the top of the hood ala late-model rally-car style - but I'm not sure you really have room even for that!

Perhaps you should sell me the car, and I'll find a way to fix it.

Rob D.

> -----Original Message-----
> From: urq-bounces at audifans.com [mailto:urq-bounces at audifans.com] On
> Behalf Of AF
> Sent: Tuesday, August 18, 2009 12:59 PM
> To: urq
> Subject: [urq] Evans Coolant
> 
> So over 10 years ago we had this big thread about using Evans Coolant
> in
> Audis. Someone did it, and used a modified expansion tank cap to allow
> proper venting. Has anyone else had any experience with this product in
> Audis? Is it less efficient as a heat transfer medium and therefore I
> would be more likely to see higher coolant temps? The reason I ask is
> that
> I'm seeing 102-106C in my V8 converted UrQ (front radiator clearance is
> at a
> real premium if you install AC). I have been told that head warpage is
> not
> likely until you see temps in the 150C range. Would Evans' product
> allow me
> to run at up to 110C with no issues, because I'm guessing after a
> prolonged
> steep climb in 100 degree ambient temps I might just see this at the
> head.
> No, I'm not moving to Alaska to solve this problem ;-)
> 
> It's also flamable too......right?
> 
> Any thoughts would be greatly appreciated.
> 
> Andrew Finney
> 1985 UrQ 4.2L V8.
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