Camaro XV

[byndbad914]

thanks Dave for the link - those plate coolers are pretty cool and it makes sense putting those in the tank and thanks for the note on SS v. aluminum v. pressure.

[parsonsj]

5/8" 6061 .035 wall aluminum tube is good to over 1000 psi. Thick walls are not required for aluminum tube for engine cooling. In fact, aluminum is a better choice because it coefficient of heat transfer is much higher than SS.

Power steering with its 1500 psi requirements is a different story... that's where the thick walls are required and steel or stainless is the better choice.

[dontlifttoshift]

Yeah, but the PS cooler typically runs on the return side anyways, so AL should be fine there, too.

[parsonsj]

Good point. SS is only required on the high pressure side of the pump, and that's usually hose anyway to allow engine movement.

[byndbad914]

Originally Posted by parsonsj

5/8" 6061 .035 wall aluminum tube is good to over 1000 psi. Thick walls are not required for aluminum tube for engine cooling. In fact, aluminum is a better choice because it coefficient of heat transfer is much higher than SS.

Power steering with its 1500 psi requirements is a different story... that's where the thick walls are required and steel or stainless is the better choice.

This is where I was going with it regarding oil cooling but let it go I have twin, large, off-road coolers on my race car, both are aluminum, pretty standard "radiators". Haven't had a problem in 6 years of beating the hell out of my car with a dry sump system (I limit my dry sump to 65 psi).

[Stielow]

I finished my hood bonding the hood vents into it. All raw exposed carbon fiber.






I had the vents laid up to match the "V" pattern.

Mark

[frojoe]

Originally Posted by Stielow

I had Dewitt’s radiator custom make me a radiator core and intercooler core. The cores nest together to make an efficient package. The assembled the cores with tanks and mounted them togther. I had it made 23 inch tall and 24 inched wide to fit a Cadillac SRX turbo fan and shroud. After a long conversation with C&R they supplied a 10 kW oil cooler for the end tank. Dewitt also built in the power steering and transmission coolers. It maybe a bit overkill but I want to get the temps under control on the new car.



The top two coolers are power steering and transmission. The lower cooler is the engine oil cooler. Using oil to water coolers it will help heat and cool the oil.



Mark

Mark, what is the fan shroud (ei fan blade leading edge) gap from the radiator core? You quote 850W heat rejection for the fan, but is there an equivalent vacuum or airflow (cfm) value that you can attach to that heat rejection rate? Also lastly, what is the core thickness of the radiator?

Thanks!
Joe

[mikels]

Originally Posted by frojoe

Mark, what is the fan shroud (ei fan blade leading edge) gap from the radiator core? You quote 850W heat rejection for the fan, but is there an equivalent vacuum or airflow (cfm) value that you can attach to that heat rejection rate? Also lastly, what is the core thickness of the radiator?

Thanks!
Joe

OEM fans are not typically rated in CFM. 850W is simply (volts x amps).

Obviously, that is not enough to design to for cooling requirements, so a volume flow rate vs. pressure drop is required - this is where many fans fall short as they are rated in CFM @ 0 (zero) pressure drop - which is not how you are using them (And some have dramatic loss in flow with pressure drop).

The SRX turbo fan flows:
~1.0 m^3/sec @ 300 Pa pressure drop (2119 CFM @ 1.2"H2O)
~1.5 m^3/sec @ 225 Pa pressure drop (3178 CFM @ 0.9"H2O)

So pressure decrease of 25% results in flow increase of 50%. Now you can see why flow curve (mass flow vs. pressure drop) is what you are really looking for in fan specifications.

If you extrapolate flow curve for SRX turbo fan, flow @ 0 pressure drop is on the order of ~2.5 M^3/sec (5300 CFM). (not 100% accurate as flow rates become non-linear at very high and low pressure drops)

You really need to know what the pressure drop is through your cores to determine flow rate of fans (that combined with heat exchanger efficiency will give you kW heat rejection).

BTW- Modern high-efficiency cores are WAY more efficient than old-school designs - so not as simple as looking at core thickness, size, etc..

Dave

[clill]

Jesus fricken Christ Mikels.....speak English....

[mikels]

Originally Posted by clill

Jesus fricken Christ Mikels.....speak English....

OK Charlie:

Big fan move sh**load air!

Dave