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Old 06-27-2010, 12:47 PM
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Default Possible low profile radiator?

I was looking around cool-iris at images for Fiat X19 and Porsche 914 radiators trying to find a sufficient sized radiator from a small car. I'm stumbled on this. which may be what many of us need.

This is a 1974 Fiat X1/9 radiator.
Does anyone know the actual measurements? I'm waiting for a response on this to find out.

Possible low profile radiator?-p10100661099681061.jpg
Possible low profile radiator?-p10100671099681101.jpg


I have been told by the people whom build custom radiators that a basic minimum rule of thumb for radiators to engines is 1 cubic inch per horsepower. So if your rad is 10 x 12 x 2" your cooling efficiency is worth 240 hp (if properly ducted, and working efficiently)

The 95-00 fiat Punto radiator measures out to 22"w x 11" x 2". (cooling for 484HP?)

That's a little on the wide side, but could be tucked under the headlight bays.

88-91 Toyota MR2 radiator is about the same size just a hair larger.

and the mini cooper radiator is 10" x 10" x 1.9" (so that according to the rule of thumb would be 190hp worth of cooling)

Again this is a minimum calculation " rule of thumb" someone whom makes radiators professionally has shared with me.

Im also playing with asking some more questions about using an inter cooler as a rad, as they are typically smaller that a rad. Just a thought though for now.

But hope this helps

Last edited by ydeardorff; 06-27-2010 at 01:08 PM.
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Old 06-27-2010, 01:57 PM
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Wish I had seen that before I stuffed a semi-custom piece into the front of my car. I hadn't heard of the cubic inch per horsepower rule before, but I guess that makes sense. I went to look at a Ferrari 348 yesterday (for my brother, not me), and was surprised how small the rads were on either side of the car... but if memory serves there was one in the front, too. I think a better rule of thumb would be to match the overall size of the radiator to the donor vehicle, whether it's the same one or a custom built unit (or two smaller units matched to capacity). Of course, as stated, airflow and routing is paramount.
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Old 06-27-2010, 02:16 PM
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I agree rick,
The engineers do over engineer stuff, but they added X numbers of extra square inches for a reason.

I think it would be a good idea to ensure you have that much at minimum. The trick is that will lead to a spendy custom built rad.

Ho- hum, as the saying goes, speed costs, how much you willing to spend? Thank god my wife doesn't know.
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Old 06-29-2010, 11:52 AM
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I just found this, chewing through the summit online catalog.

AFCO Racing 80105N - AFCO Racing Scirocco Style Drag Racing Radiators - Overview - SummitRacing.com

Radiator, Universal, Scirocco, Aluminum, Natural, 21.5 in. Wide, 13.25 in. High, 3.0 in. Thick.

Those measurements looks very favorable! And only 256 dollars.

And according the cubic inch rule of thumb,.. thats what?, 854.6 HP worth of cooling? At least something like this wouldnt take up the whole nose when its canted forward.

seems using scirrocco rads is common amung many small car enthusiasts when upgrading to V-6's Im finding that alot on Fiat and other fan sites.

Last edited by ydeardorff; 06-29-2010 at 12:07 PM.
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Old 06-29-2010, 12:04 PM
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That's close to what I have, just different layout (and cheaper) Griffin Thermal Products 1-26221-X - Griffin Aluminum Pro Series Radiators - Overview - SummitRacing.com

With that big hunk of iron turning, it got hot pretty quick. But it was sitting static, so I added a fan and the temperatures seemed to drop pretty quick. Rads that size take up more room than you think...and mine is even canted backwards slightly!
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Old 06-29-2010, 12:16 PM
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yeah and those measurements are for the core only, not the rest of it. LOL its comes out to about 30 inches wide Im told.

And yeah rick everything seems to take more room than intended in these cars. But thats half the struggle, fun, is finding that "just right" part, and sharing the info with everyone!

I love that feeling and grin one gets when a new part takes its place in the car.
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Old 02-23-2011, 10:11 PM
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Quote:
Originally Posted by ydeardorff View Post
I was looking around cool-iris at images for Fiat X19 and Porsche 914 radiators trying to find a sufficient sized radiator from a small car. I'm stumbled on this. which may be what many of us need.

This is a 1974 Fiat X1/9 radiator.
Does anyone know the actual measurements? I'm waiting for a response on this to find out.

Attachment 1041
Attachment 1040
Im not really sure about the measurement of that radiator. Did you say that this was customized?
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Old 02-24-2011, 05:47 AM
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I have been asking alot of people about this subject as Im the type whom hates buying the wrong thing.

After some email exchanges, I have been informed that the rule of thumb for choosing a radiator is 1 x 1 x 1" per horsepower.

Now this measurement does not take into consideration extra cooling ability needed for an AC condensor, nor internal oil cooling. This would be for the Engine only.

A Fiat X19 radiator might be sufficient to cool an EJ22, or even an EJ25 being non turbo'ed.

But if your talking about larger, turbo'ed. or typically hotter running engines, the radiator must be sized accordingly.

But another big thing to think about as well is how effectively your radiator is getting air. Its placement and efficiencey is paramount. Even a 10 foot radiator placed in a closed box wont work.
Right?

To give an example. The WRX STI Turbo runs stock at about 300HP, yet its radiator is worth 768 HP according to this rule. So it cooling needs to be over twice what is needed, to compensate for the AC condensor being placed in front of the radiator, and its built in oil cooler in the radiator, on top of it cooling efficiency given its placement in the car.

Most exotic cars run a ram fed style system, but with a good sized exhaust for the hot air. So its fairly simple to say how the air can get into the radiator, but another thing to consider how it gets out.

I have found the scirrocco styled racing aluminum raditors a better choice for my WRX engine.
they are 24 x 12.5 x 3 inches and are aluminum which dissapates heat more efficiently than steel.
Something to think about.

Last edited by ydeardorff; 02-24-2011 at 06:14 AM.
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Old 01-04-2013, 08:55 AM
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I think a better principle would be to go with the overall size of the rad to the contributor vehicle, whether it's the same one or a customized made unit (or two small models printed to capacity). Of course, as mentioned, circulation and redirecting is critical. . . . . . . .
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Old 01-04-2013, 12:33 PM
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That's the trick, you cant. This car teaches you quickly just how small it is.

Now going with the idea of using "X" square inches as a base unit measure when determining the radiator is fine, and a good idea. If that's your meaning.


But, I have not found a single OEM radiator that would fit under the skin of this car.
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