radiator shroud and fans

I'd go with a short - one inch or so - shroud.

Passive - moving car - air movement is not that important in a Pantera. Most of us, at speed, have no cooling issues.

BUT, at slow, city traffic situations, we need all the air flow possible. Shroud comes into the factoring here, and is a bonus, not a detriment.

Larry

I've already gone through this with 6018.

I had a custom radiator built, with a 1" thick shroud on the back side. I can mount the radiator straight up in the oem configuration IF I use the Spal medium duty fans, which are relatively thin. If I opt for the heavy duty fans, I'll have to lay the radiator down a small amount, because the fans hit the headlight bar. The thicker heavy duty fans also hit the inner fender walls down low. I purchased both sets of fans, so this is not guess work, this is based on actual trial and error.

I'll be starting with the medium duty fans, and only go to the heavy duty versions if the medium duty fans prove to be inadequate.

cowboy from hell

When installing the dual flexalite fans/shroud unit read up and seem to recall the optimal distance for the fan blade to radiator was a 3/4" gap, which for that unit entailed fabricating some brackets with a stand off and installing a thicker rubber seal around the shroud.

As Larry says the shroud comes into its own at low speed (presuming it is sealed to the radiator) as it forces the fans to pull air through the rad and prevents short circuiting. At high speed (sustained 150+ mph) it can be a detriment as the shroud can restrict air flow as has been discussed previously. Johnny Woods encountered it and overcame it with a neat system of flaps that were forced open by the air pressure at high speed.

thank you, a shroud it will be!!

there is no place around here where i can cruise at a sustained 150mph, so it will be a simple shroud.

nazgul

Check this out,
http://pantera.infopop.cc/eve/forums/a/tpc/f/5650045562...540075764#8540075764

Mark

Here is what I did.

As Julian says, I found the flexilite fans and shroud would work perfectly in traffic, but at 150mph (when the engine is building it maximum heat) the car would very quickly overheat because large areas of the radiator where blanked off with the shroud.
I can remember one particular time in France (before I installed my taller 5th gear) I was at the toll both entering a very quite motorway when a Lamborghini Murcielago pulled up along side. I chased the lambo until I was over revving the Cleveland in 5th at 6500 rpm. My friend Tom shouted "look at the temperature gauge" It was nearly off the clock!
I said "F**k me" and Tom said "F**k me"! We could smell the engine over heating even at that speed.

When I got home I cut away all the plastic that formed the corners of the shroud and made some aluminium flaps. These flaps suck down when the fans are on in traffic, and blow open at about 10 mph.

I had no chance of catching the Lambo..
Johnny

Pic 2

I have since had the car flat out many times with no overheating at all.

Nice set up with the flaps.

i am getting envious of all those pretty aluminum radiators. mine is the original or a custom copper/brass unit that except for accident damage is functionally ok, but it is ugly!!!!

but a coat of paint will still not make it as pretty as the aluminum ones.

damn, it is too late for santa claus!!!!

nazgul