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The high flow stats. There were four that I know of being sold: Robert Shaw, Mr. Gasket, Milodon, Stewart Components. Most likely all made in the same factory, only difference was the 'box' they went into.... I even have been using them for decades. I even have a rare 140* marine version. The...

If your heater core is blocked from sediment, the radiator could be also. Cross flow rads are the worst for this, not sure what model uses.

Post#6. Yep it is moving at 2X the speed. But is it removing 2X worth of heat generated. Every car I have owned from the pre-computer era that just had a mech fan got hotter on the freeway.

I pose this scenario to those who have engines that run too hot [ whether they are actually too hot or the owner is just worried about it ]. Especially pertinent with 4.10 gears which will have high engine rpms on the freeway. "The engine produces twice as many power strokes [ that create heat...

Mate, it is always good to banter with you. Cheers.

Rusty, If measure up all the holes in the head gasket/block/head [ I have done it ] , you will find their combined area exceeds that of the stat opening.....by a large amount. The stat becomes the restriction in the system that allows pressure to build up behind it. The pressure suppresses...

Drilling the stat makes it worse because it reduces the pressure in the system. The pressure reduces localised nucleate boiling [ air/steam bubbles ]. The reason that drilled stats appeared on the scene is that Stewart Components, maker of race water pumps, eliminated the bypass in some of their...

Without reading 9 pages again, I thought of something that may have an affect on engine temps. This applies to intakes that has the t'stat housing as part of the intake What I found was this, with high flow t'stats such as Milodon, Robert Shaw, Mr. Gasket. When these stats are fully open, the...

72Blu, Not only do you need to improve your knowledge base, but also your reading skills. The OP never claimed it was just o'heating at idle [ your post, #135 ]; in post #11 he says the temp climbs when he is driving. At least TWO well websites that make cooling fans recommend mech fans over...

72 blu, Post #111, [ 1] This will be the second or third time I haver told you that the 6000+ cfm figure on a cooling website was many years ago, probably 20 or slightly more, & that that info has since been withdrawn. That is why it is no longer there. [2] The Suzuki example...

As I said earlier in this thread, sometimes the cause of the problem [ o'heating in this case ] cannot be found, despite best efforts. I know of a Suzuki Swift that had an engine check light that kept lighting up. Everything in that car that could possibly cause the problem was changed but...

Slappy, I can answer your question in post #22. Buy a 18-19" mechanical fan.

72blu. 6000cfm from a mech fan. Read what I said in post #65.

72Blu. Post #77. I understand thermal efficiency just fine, thanks. You do not. Waaaaaaay back in this thread that for reasons unknown, I noted the OPs engine runs hot. His engine is not the only engine that runs hot for unknown or non-obvious reasons. I offered some reasons for that, such as...

George J, Agree with you. Some will just never get it.... What is the point of 'saving' hp with toy electric fans, but your engine overheats & you cannot enjoy driving it!

Post #59. The problem with those small fans is that they are [a] small only pull air through some of the rad core & [c] the fan shroud blocks a significant portion of the core, which will inhibit air flow, particularly when the car is moving. The fact that it might cool ok on that car does not...

Internal friction may well be the cause of the problem. So can rust scale on the cyl wall jackets & a host of other things. The point is, short of building a new engine, how to control overheating? Try the things I listed earlier. Water pump efficiency that I mentioned makes a big difference. I...

Another thing to remember when chasing a hot running engine. There may not be any one 'thing' that reduces the running temp with a big drop... It may be series of smaller changes that add up: better fan, tight fitting shroud, more efficient pump etc. If you make five improvements & each one...

Get rid of the toy fans. Factory clutch fan with Hayden or similar severe duty clutch; matching shroud, blade tips close to shroud. If this gap is to large, the shroud becomes useless. Seal up shroud to rad gaps; & seal up rad to rad panel. Idea is that ALL the air should be pulled through the...

[1] If the engine runs hot, good idea NOT to use the trans cooler in the rad. [2] Trans rubber hose is a higher pressure rating than fuel hose for a carb. Carb hose might swell or burst. Better to get the correct hose. I use the blue Aeroflow hose. I have nipples in the trans & have removed the...

Without those holes, that shroud would be about the best baffle you could get, ie it would a LOT of air coming through the radiator. There is a reason the factory shaped shrouds the way they did.....

I watched a Richard Holdener video earlier today on 4.8/5.3 LS engines. One had a large plastic clutch fan with 9-10 blades. I would pick that one....

Don't let the facts get in the way of a good story: - some years ago, Hayden or Flex-a-Lite or one of the fan companies had flow figures on their website. A 19" seven blade mech fan pulled 6000+ cfm. Have not seen an elec fan get close to that. - newer cars have generally smaller engines. So...

[1] And lots of people use 180 [ or 160 ] thermostats in their old cars NOW. When these cars were made, the fuel had lead in it which cooled the combustion process & reduced the chance of detonation. No lead to day, cooler engine by whatever means, to reduce chances of detonation. [2] New cars...

Yes, lots of modern cars use elec fans. But there is a big difference between these & our old iron monsters. New cars run 195* t/stats or higher. Our old stuff runs best with 180s. So elec fans on old cars would have to pull more heat out....

Elec fans. Sigh. An elec fan that can pull as much air as my 7 blade, 19" mech fan, would need an enormous motor to drive it. Substantial parasitic loss. I do not see anything clever in moving from a reliable, stand alone, mech fan to a complicated elec fan that needs a controller or relay to...

Elec fans might have less parasitic drag, but they are useless if they do not keep the engine cool...

Causes of high freeway temps [ other than already mentioned ]: - insufficient ign timing. With that CR, you want about 45* - lean mixture - t'stats take 20-25* to fully open for max flow. So a 195 might get to 220* before flow is at a maximum.

Clutch fan. Wouldn't run anything else...

I stopped at post #1 & read no further. A 'toy' fan, 2250 cfm? Large factory flex fans pulled in excess of 6000 cfm. Not hard to see where the problem is.....