![]() The reduction in pressure is a positive for head gasket concerns, I would think. I am also surprised that none of the Evans users reported higher coolant temps given the lower specific heat of Evans and the marginal cooling systems of any Lotus - or do Elans actually have an adequately sized radiator? I don't know enough to say that the increase in cylinder head temps they say they saw are high enough to cause pre-ignition that they saw, but 5 - 7 octane numbers and retarding the spark by 8 - 10 o seem like a lot! I was initially skeptical of it because of the somewhat fantastic detail of the analysis but then they might actually be able to measure the things they claim because they are in that business but then again, that makes them a suspect source. (suspected bias but they do have lab reports and "numbers" ) I'd be interested in any references you've found detailing real world gains which are independent of "I'm selling this stuff" bias. ![]() Here's the report I mentioned in case you've not seen it already. With the difference of expansion coefficients of Steel/CI vs Aluminium I did pause to wonder how long term use would affect head gasket performance ? The temperature data I'd seen before this report concentrated on either removal of localised boiling (which I can't measure/don't know if it's a problem I have) or the bulk coolant temperature rise, which is what you can easily measure although not necessarily what you should be concerned over. I was particularly concerned with cylinder head temperatures being higher, which they claimed to have measured and I think, given the nature of the products, could be reasonable. Now I assume this is biased given the sponsorship and the writing style certainly comes across as "their product is junk", but some of the report makes interesting reading. One reference from your side of the pond that I found I'm enclosing just in case you've not seen it. I'm not particularly interested in the novelty of a non-pressurized cooling system, I was looking for comments like "I regularly get 5mpg better mileage" or "I get another 15bhp on the dyno compared with water" but I haven't seen any. I can't see any reason why the Evans coolant won't work or deliver the benefits they claim and the only reason I've not had a go myself is that I'm skeptical if the benefits are truly beneficial in looking after my toys. ![]() But such details are going to be 5 or more years down the line, not in the first few years and maybe never on a car that's infrequently used.Īnyway, a few guys on the Elan forum tried it and to my knowledge no-one has reported faults, all have said "works well, will use again" which is a guarded positive endorsement. It might not even be a problem long term but at the back of my mind is things like rubber, etc, degrade with operating temperature and hence the service life could reasonably be expected to shorten at higher temperatures. The reason I'm sounding so pessimistic on that is because such things like an extra 3-7C running temperature (as claimed by Evans) isn't going to leap out and hit you in the short term. I don't know if it's any better over your side of the pond, but here I started to notice it probably 3-4yrs ago (although my memory for dates is poor, so it might be longer ?). I suspect you'll struggle to find meaningful practical experience over in the UK because it's not been around long enough. Having said all that I'm still open minded, so the debate is still of interest to me. I also get the "no water, no corrosion" aspect, but is this really a problem with even basic anti-freeze mixtures ? One less thing to worry about and it will do away with the coolant changes every few years but without upgrading all the rubber components it just isn't going to be a "fit and forget" solution as some folks claim. It's not the coolant which screws me, it's the driver. I've only ever had two engines boil over, one was a Hillman Imp with a leaking head gasket and the other was my Europa when the belt snapped, neither of which problems would have been solved by not having water in the system. I get the higher boiling point, lower pressure in the system and can even go along with the idea of more uniform cooling in potential hot spots but that's where it leaves me. Sadly, it's just one of those modernization things that I don't get. A couple of threads in case these haven't already been part of your research Īnd to show such topics resurrect themselves on a regular basis, from the previous year. I can't help with the practical experience but as you mentioned use in the Elan, this topic has been discussed several times on the Elan forum with some of the guys getting into the detail and some guys there who have used it in their cars.
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