Hello!

does anyone have any experience with smaller diameter electric fans (reversable or pull/push 1-way) types? like 7 to 9" in diameter?

i'm looking for a fan to be placed on my oil cooler which is tucked in my passenger side fender well, to be pulling through my 13"x8"x2" Setrab 25 row cooler.

was at a track day with 107+ ambient temps and my oil temps were still quite high.

any help would be great- i.e. brands you've used and the CFM rate..

--Cheston

 

I thought about it for my trans and oil coolers. I even purchased a 7" fan from summit racing, but ended up returning it. I came to the conclusion that it would be better to go to the effort to put the coolers directly in the path of airflow and let the large radiator pull fans do their job when needed. I also upgraded my coolers to the largest that would fit in front of the radiator (well the trans cooler is huge, but the oil cooler could have been bigger) and moved everything else out of the way (horns, wiring, brackets etc).

My oil temps (unsleeved built motor) will approach 240 degF while boosting on a hot day even with the oil cooler right up front. And that's still not road course conditions. XKR runs 2 oil coolers, fwiw - not sure if those are plumbed in parallel or series. I stole this from his site:

 

i have my oil coolers in the same areas, but the way my front bumper is set up (long nose) majority of the flow is toward my radiator and intercooler, under heavy tracking i've seen pre-cooler temps of 260/270, and i would still like to reduce this with a cooler.

i think with the adequate fan cfm flow, i can get stable oil temps even under heavy loading with hot ambient temps...

which 7 " brand did u end up returning?

 

Cooling in series is better than cooling in parallel and much better than using one large unit due to less backmixing. Thats all i can add to this thread

 

Actually upon further thinking, two paralel smaller coolers will work better than one big cooler. In regards to adding a fan, if the air that its blowing will be hot, what good will it do? You'd still want to duct fresh air to the front.

An extreme setup would be v setup for i/c and radiator with a spot for a long oil cooler. long oil coolers are better than square type typically because the oil has more time to cool. (like the fluidyne and arc (i think))

 

i use here in miami dual 12" fans from ZIRGO and havent had any problems........

Check out the website: http://www.thehoffmangroup.com

thats where i bought them from

 

Make sure you have strong oil pressure though...

 

Cheston, I know this sounds nuts, but you might end up needing an even larger cooler, or a second one. Give the fans a try and report back. From my experience, the fans help prevent the onset of heat soak, but once you get thoroughly soaked in heat their effectiveness drops off.

Can you post up a current pic of your front bumper/cooler arrangement?

 

so if you are running dual, are you running them in series or parallel? Do we have a big enough oil pump for series?

 

Oil pressure is one thing, oil flow rate is another. In this case, since the temperature range will drop with the addition of a second cooler, the pressure will likely increase due to an increase in viscocity. Second parallel cooler ftw!.

Sharrif is right, if the cooling capacity just aint big enough, no amount of airflow would help. Besides, adding a fan just adds onto the list of things that can break.

 

doug showed the light...
this d00d had it right

 

yea.. i know.. i was thinkin i might need to go with a secondary cooler, but i'm runnin out of real estate!

i have a bad pict but u sorta got the idea:

cooler (just before the wheel)


the vent for extraction (mesh)



everything w/o bumper. Left side of IC is oil cooler (25 row 13"x8"x2" setrab) right side of IC is PC cooler



with bumper


i get the front end down force with this bumper, but that tiny inlet hole on the pass side, just isnt enough airflow for the cooler.. i was thinking of making a shaped duct to go ahead of the IC and route airflow to the side where the cooler is, and use the fan to help suck in that air..

otherwise.. i may think about switching to the Cwest short nose or back to my TS front...

the fan is on the way.. hopefully it'll work. i ordered a 7.5" SPAL Pusher fan, 440CFM..

 

I almost went w/ the longer design Fluidyne 30816 mounted just in front of the intercooler but slightly lower ala arc positioning. This one is 28in long and should help out more than the square design. http://www.fluidyne.com/pl_theoc.htm...18,%20DB-30816

 

Make a divergent shroud for the cooler, with a standard brake cooling duct inlet, and plumb it to the passenger side opening. I don't really know what the backside of the front bumper looks like so I'm guessing here. Channel the air so it has nowhere to go except through the cooler.

Terry

 

Channels are great - this one mates perfectly w/ my chargespeed type 2 bumper and vents out where the side markers are supposed to go.

 

Nice. Did you use aluminum sheet?

Terry

 

Yea...

 

I agree. A divergent shroud really works! All my friends with full time race cars have divergent shrouds for their intercooler, radiator and oil coolers. They even use duct tapes to make the sroud completely air tight, so the air has nowhere but to go through the coolers. This is why I want to make something similiar to Amuse CSL shroud.

 

So XKRs car uses dual oil coolers in series. So in teh real world its fine. Just curious how the return line is plumbed? Both lines come from the sandwich plate, so how do you get flow? I guess they must be directional?..

 

what is the thinnest fan shrowd possible to get for the Z? I've seen 2.5" at the motor online for a 14" fan (want two if possible). What is the thickest radiator you guys have been able to squeeze into the Z? Saw far to hot water temps on my trackday so looking for the biggest possible solution. (and cutting the oem bumper)