Electric fan size choice

[TC]

I dont think so, pretty sure the 8-10" fan shroud that were found stock on the cars would be what to copy so you get draw from all four corners of the radiator.

It doesn't matter(to a point) how far away the fans sit off the radiator core. What matters is having the shroud sealed to the radiator so that air can only be pulled through the core..... That is why I'm not concerned with the fans sticking over the tanks on my radiators, the air can only come from one place and that is through the core.......

[TC]

And for anyone that cares, I also found this 4 row all aluminum radiator that they rate at 1000hp, I'll probably being using this on the Monte.....



http://www.ebay.com/itm/261066546958...ht_6261wt_1397

[JeffMcKC]

I will be bringing my wind meter on Drag Week I hope no one has issues but it will show the CFM of your fan thru the cores you have chosen, I bring that up because I have a "Cup Speedway radiator" thats huge and doubled up. It would take 200 mph air to make it past it.

I also think there is a min. distance or the blade will cavitate the air like all things taper yadda yadda will afct the speeds Dirt and asphault car info and parts are easy to come by on this,

Stack spacers and a fan dont work well they tend to speperate from each other at higher rpms

[skullbucket]

A 1000 Horsepower Radiator? Who would have thunked it?????????

[MR P-BODY]

Here's a little info for you guys... first 2 fans doesnt always give you
greater area.... your just figuring the fan diameter... now deduct the
motor diameter because the motor isnt passing any air across it...
also a fan with the outer ring attached (anti spill ring) is much more
efficient... just like a air plane wing with the tiplets at the ends... they
(and the ring on the fan) dont allow the air to fall of the ends and create
turbulence which reduces the air being pulled in.... next.. the shroud should
cover the total fin area... just make sure it has some room near the outer
edges to allow the air to turn(dont try mounting a sheet of alum directly
to the radiator surface)... otherwise you just reduced the area of the rad
to slightly larger than the fan diameter ... you need to have enough rad
to travel down the road(highway speeds) so the fan/fans dont come on ..
you should have MORE than enough air passing through it

[skullbucket]

Thats exactly what I have been saying all along, Sherman was a dumb*** and Mr. P Body knew his ****!

[CDMBill]

Hmmm, this reinforces my view that the OEM applications are a good starting point, especially if you don't don't modify fan to radiator spacing as I did last year to accomodate a used "Nascar" radiator. False economy on that one as I ended up buying a new correctly specified radiator from AFCO, matched to Linclon Mark VIII fan I'd had since the beginning with the Howe universal unit that matched it in terms of core size. The Mark VIII fan has a spill wall (new term for me) and is 1.1 inches form the core, the shroud is 1.5".

I did some hot weather testing today here in Tucson at 2 PM in 108* degree weather, 50% humidity and all system were go after 30 minutes of low speed winding roads, traffic and the occasional burst of acceleration. Saturday afternoon we're off to the track here and we'll see how it responds to 5000 DA and a lot of heat.

[MR P-BODY]

Thats one of the benefits for working for the auto companies(Chrysler for me) I
got to go on MANY road trips doing testing.... and in my case I had
to work on cooling, fuel and exhaust.... but with over 1200 thermocouples
on each car, it could be a bitch keeping them all working... and lots of
recording equipment ... but you sure can learn ..... some of those trips
I'd be on the road for up to 5 weeks at a time(they do get OLD)

[JeffMcKC]

Here's a pic of the radiator I did for my '71 GMC, on this one the shroud does cover the whole core and it also has a trany cooler in it......

This has no releif for the air to pass thru if the fans stop the air gets blocked and will build heat look at the BeCools they have rubber flaps to blow back and let the air pass thru with no fans running

[MR P-BODY]

This has no releif for the air to pass thru if the fans stop the air gets blocked and will build heat look at the BeCools they have rubber flaps to blow back and let the air pass thru with no fans running

The only time the flapper doors come into play are at speed... but you would be
suprized how much air travels through the fan/fans at speed when not running...
they are still spinning pretty good... would be different IF they seize up but then
it wouldnt cool at low speed....... I did add 2 spring loaded doors on my HHR fan
shroud for added air flow at speed(my rad is mounted on a angle) so I had to use
light springs to keep them shut till about 40 mph wind speeds ... still fine tuning
the springs..... but I believe I'm over killing it

[TC]

This has no releif for the air to pass thru if the fans stop the air gets blocked and will build heat look at the BeCools they have rubber flaps to blow back and let the air pass thru with no fans running

Interesting that Ron doesn't seem to share your concerns.......

http://www.rondavisradiators.com/radgallery.htm

[yellomalibu]

Nice looking stuff! ... but I googled the part number for the one that fits my Chevelle ( 11-16CL6877T ) and the website I found that listed a price was $960.

The last time I bought a radiator for the Chevelle, I paid $25 at a junk yard - it came out of an old Bonneville, although the radiator was almost new at the time. This was in the mid 90's.

I will be needing to buy a radiator for the Chevelle one of these days, but I can't see me spending that kind of coin... not when I know from personal experience that a stock shroud / fan setup works perfectly well.

With all the other things the Chevelle needs; gas tank, gears, posi rebuilt, front wheels and tires, possibly even a/c - I can't see me spending a grand on a radiator/shroud/fans with my slow-motion budget.

... but that sure is nice looking stuff, and I'm sure it works great!

[anotheridiot]

Interesting that Ron doesn't seem to share your concerns.......

http://www.rondavisradiators.com/radgallery.htm

So the shroud the guy fabricated for you for 150 was supposed to be a copy of a ron davis design then? I did not notice the angles on your first radiator you posted here, there were uncovered areas in the corners, but like yellomalibu writes, thats what I expect to pay for a radiator.

[anotheridiot]

Nice looking stuff! ... but I googled the part number for the one that fits my Chevelle ( 11-16CL6877T ) and the website I found that listed a price was $960.

The last time I bought a radiator for the Chevelle, I paid $25 at a junk yard - it came out of an old Bonneville, although the radiator was almost new at the time. This was in the mid 90's.

I will be needing to buy a radiator for the Chevelle one of these days, but I can't see me spending that kind of coin... not when I know from personal experience that a stock shroud / fan setup works perfectly well.

With all the other things the Chevelle needs; gas tank, gears, posi rebuilt, front wheels and tires, possibly even a/c - I can't see me spending a grand on a radiator/shroud/fans with my slow-motion budget.

... but that sure is nice looking stuff, and I'm sure it works great!

If you arent buying other body stuff, check out RockAuto for the gas tank. I got one for my 66 from there, nice piece (hell they are all made at the same indonesia plant anyway unless you get a real canada tank) took it out of the box and powdercoated it real quick. Anyway, the price was not much different, about 110 but shipping was only around 30 bucks for fedex when alot of the other places want to ship them truck freight. But I agree, as long as you have the stock fan shroud, you get a real nice draw thru the fan of all corners of the radiator.

[TC]

So the shroud the guy fabricated for you for 150 was supposed to be a copy of a ron davis design then? I did not notice the angles on your first radiator you posted here, there were uncovered areas in the corners, but like yellomalibu writes, thats what I expect to pay for a radiator.

Mine were more like the Prototypes for their design on those radiators... You have to remember that my friend that made the shrouds for me is Ron's son........