Lotus Elan and Lotus Elan Plus 2 Forums

jimj wrote:What does it matter if the engine runs a bit hotter? That's not a statement, it's a question. Does it matter if I'm running at 100C rather than my normal 85C and it goes up another 20C in traffic?

It`s no problem, just that instead of white steam you`ll see blue smoke.
Jim

If you don't have a thermo Oil cooler in a sports car i would not be shocked to see it Blue smoke anyway especially if it has no valve stem oil seals

The engine will run hotter as the heat transfer coefficient is lower and viscosity higher than normal coolant. How much hotter depends on how much spare capacity was in the overall cooling system and what was the normally limiting element in the heat transfer system from engine to coolant to radiator to air.

If the coolant goes up 35 degrees to 120c then the average engine metal itself will have gone up more maybe 40 or 45 degrees from around 100C to 140 - 145C. However as observed some hot spots like around the exhaust ports may be actually cooler due to lack of boiling in these hot locations causing vapour blanketing.

In general this hotter temperature may cause loss of viscosity and oil oxidation to occur more rapidly but a good quality synthetic should compensate for that adequately in normal road use but it is getting near normal synthetic oil limits and an oil cooler would be desirable. It may also affect clearances which may or may not be a problem but assuming normal tolerances should be OK I would think.

cheers
Rohan

I tried Evans in my S4 SE, narrow rad. & found that the engine ran significantly hotter than with an antifreeze mix. I took it out & returned it to using water & antifreeze. Like one of the other posts I always have a battle with high temp in stop & go traffic & have seen 110C on my temp gauge at times. This is in Ontario, Canada where we can get temp up in the mid 30s. Funnily in the Spring & Fall when the temp is around 10C it barely gets to the thermostat temp & anything below that temp I have to almost totally block off the grille.

Hi All

I was interested in Evans coolant - - though not for a car application - - but with a +2S I am doing up it had a side interest! The application was high power electronics equipment when we frequently use standard ethylene glycol in a 50%/50% solution with water to cool the equipment. when it first appeared I though I would get the chemists at the company I then worked for to analyise it. I have attached a print out of the analysis and also the comments by the company chemist giving an "opinion" on how it would work in a car engine cooling system

Basically the EWC Classic Cool I80 is virtually 100% ethylene glycol with adatives to reduce copper and steel corrosion effects.

I also conducted a simple test by immersing a component dissipating a known power into the water and then EWC and basically the part temperature rise above the bulk fluid was higher- - but by design this could be compensated for.

So all of this tends to confirm what some have found when used in a car that is it does get hotter, but the temperature can stabilise if cooling is adequate and it has a higher boiling point.

So I guess it does "what it says on the tin" Not sure I will use it in the +2 as for road use I expect to be stuck in traffic and in the UK at least it is quite expensive.

Hope this is of interest

regards

Bob

Grizzly wrote:...Also as i have already said the Evans does not bleed well at all, you tend to get really bad air locks if you don't pressure bleed it...

I'm running Evans in my Twin Cam engined Ford Anglia, how do I go about pressure bleeding the system?

I converted to Evans water-less coolant six months ago. Now that summer is here and ambient temperatures higher, I do notice an increase in running temperature , which is now approaching 100C at anything less than 50 mph on the highway. There is a manual over-ride switch on my fan, so I usually switch it on before the thermostat does. Evan's technical guru assures me that actual engine metal temperatures will be lower than if I was using water/glycol mix as there will be no hot spots causing local boiling. From what I can gather from other forum posts, many elan owners are not convinced, but has anybody out there any real horror stories to tell about the continued use of Evans waterless Coolant in the twin cam engine?

folding_bloke wrote:

Grizzly wrote:...Also as i have already said the Evans does not bleed well at all, you tend to get really bad air locks if you don't pressure bleed it...

I'm running Evans in my Twin Cam engined Ford Anglia, how do I go about pressure bleeding the system?

I didn't have to do any pressure bleeding, just filled the system up and have run it ever since. Going by the date I posted on here, that's 3 years now. Yes it does seem to run a little hotter, but that doesn't cause any problems. The fan kicks in when it needs to but I've never boiled up obviously and never had to top it up or do any maintenance.