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Post by lanceslambos on Oct 5, 2017 9:13:59 GMT -6
I've been looking around for different cooling fans that might fit our radiator. It looks like there's two sizes to choose from which begs the question - wouldn't larger fans push more air? (unless they move slower) It looks like by the specifications that the 14" move about 50% more air!! Without measuring mine right now I can't say what size we have but this could be a cooling mod/ upgrade for all of us! fan options(go to product options then size) 11-7/8" x 12-1/2" for $68.10 or for only $7.96 more - 13-7/8" x 14-3/4" Then again, did the 4.6 northstar have the same size as the Aurora? Other cars got the benefit of a front grill, but maybe better fans too!
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Post by Toronado3800 on Oct 5, 2017 20:53:09 GMT -6
Is the problem cfm or the goofy low speed until 225 degrees setting?
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tigger
Administrator
Posts: 2,844
Staff Member
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Post by tigger on Oct 5, 2017 22:58:45 GMT -6
It looks like there's two sizes to choose from which begs the question - wouldn't larger fans push more air? (unless they move slower) If the blade pitch and surface area ratios are the same, yes, at the same RPM a larger diameter prop will push more air...
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Post by lanceslambos on Oct 6, 2017 9:26:58 GMT -6
Is the problem cfm or the goofy low speed until 225 degrees setting? Probably a combination thereof. An aluminum V8 without enough ventilation is the problem. I have my coolant tank sensor unplugged at the expense of constant DIC warnings, and even with a fresh coolant flush & water wetter, 18 lb. coolant cap, fans on all the time, dust flap delete and 5 minute hood mod, engine cover delete - she still runs around 215 in town. My last Aurora hardly ever saw 215, in fact it loved to run at 190ish no matter what. Why hasn't anyone upgraded their fans? Maybe someone has and never posted results. I'm definitely doing this when my motor is installed. Another GM mystery, why didn't they provide better fans on a car that must rely on them most of the time? 845 cfm vs over 1,200? An obvious choice it seems.
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Post by Toronado3800 on Oct 6, 2017 14:38:03 GMT -6
Not sure if this will help or just cause turbulance.
My 89 Toronado and 86 Riviera parts car for it, both had 10" or so pusher fans. My 3800V6 Toronado liked running 208 to 214 degrees.
I was able to mount my Rivi's fan in the front of the radiator of my 68 Mustang. It helps a little.
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Post by sall on Oct 6, 2017 19:42:35 GMT -6
"A Faster Fan is a Better Fan
There are many myths regarding electric fans. One belief is the faster a fan turns, the better — which is not completely true. At high speed, the radiator slipstream should be strong enough to carry heat from the radiator. When air is moving too fast, you get into boundary layer issues where heat doesn’t get carried away because air isn’t actually touching fins and tubes.
You want air to move slowly enough across fins and tubes to where it carries heat away. At speeds above 40 miles per hour your engine doesn’t need a cooling fan. This is why a thermostatic clutch fan or electric fan works best."
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