Hi Ron

I'm going to try out the efans and see how it goes.

 

Talking about MB, isn't their typical set up two small pushers in front of the condenser and one big puller blind the radiator? All electric, obviously?

 

mikey, most heat soak is from the much hotter oil in the crankcase, heat rises upward!

how would you deal with 250/300F oil that could easily boil coolant out of system vents,(like pressure cap not holding pressure).

its quite common when things are just to hot to handle , once coolant is out you have to refill ,,(not recommended on a hot engine).

would you run your vette without a fan shroud in traffic on a hot day?

 

i agree you should hear it when all fans are at full output, in a parking lot, idling slowly, and its 105F ambient!

exatcly why M/B is looking for a better way to cool things.

 

But it does work, right ? I mean, it does keep the cars cool. Personally I don't care about the turbine noise if it's going to keep A/C cold in stop and go traffic at 110 degrees.

 

The oil never gets as hot as the pistons, cylinders, cylinder heads etc. etc, at least when the engine is running. Much like the coolant, oil temps rise after engine shutdown also due to the soakback. In some cases (not on XJS) the oil temp can exceed the capacity of most conventional oils and synthetic must be used in it's place to avoid coking.

Gas turbine engines (my background) suffer from the same effect.

Not sure what that has to do with fan shrouds.

 

I'm in Northern California, so not so hot as other places in the U.S. but the traffic here is terrible. No matter where you go or what time on any particular day, gridlock is a strong possibility; which is why electric fans seemed so attractive. As it is, the efans don't seem any more or less effective than my stock system which was working fine. Idle seems smoother in traffic and the engine feels slightly more free reving but that could be my imagination. The myth about fuel economy improving does seem to be just that.

 

Hi Rhett

As my XJS is not my daily driver @ £1 for every 2 miles!

I tend to stay away from Traffic Jams and go for Scenic drives out in the Country, where the Mechanical Fan on my Grey XJS was more than enough to keep the Engine Cool and never went more than 1/4 way up the Temperature Slider.

Except the Fan on my red XJS had started to get some Stress Cracks in the Mechanical Fan and as I am fitting a New Re-cored Rad, didn't want to risk the Fan breaking up.

Since I couldn't get hold of a 'deep dish fan' I felt I had no choice but go electric and got a pair of efans from an XJ40 V12.

So since I've made a Frame to fit them, I thought that I may as well give them a try to see how they perform and then do a comparison between the two different set ups.

But 'Sods Law' being what it is, I've now got a 'deep dish fan' as well, so in the event that the efan, doesn't work for me, then I can always do a swap back to Mechanical.