e-fan CFM?

[JoeyBones]

Anyone know approx CFM required to keep the e30 at proper running temp? I'm sure its different per motor, but any help is appreciated.

[nando]

pusher - 2000cfm
puller - 1600cfm

they're really only needed when idling in traffic, it will probably never come on with the car moving at any decent speed.

[JoeyBones]

Thanks for the help!

[jlevie]

It depends somewhat or where you are. Here in the south I've found that it takes a 16" 2300cfm fan to handle worst case conditions.

[nando]

pusher or puller?

hottest day I've ran was about 101f, with a 16" 2100cfm pusher. Cooling the engine was never an issue, however people's jacks and tools sinking into the expensive asphalt skid pad because it got so hot was..

[JoeyBones]

hmmm...well judging on how hot its been thus far, I might should look into something fairly large. What if i use it in coordination with the aux. fan that's already there?

[Naplm00]

Mine came on for the first time ever today...sittin in a harbor freight parking lot.

Ive got a Flexalite 16in with curved blades set up as a pusher..it sits less than an inch from the front of the RAd on some brackets I made.

When it spooled up it dripped the needle immeadiatley, M42 RAD btw

[nando]

hmmm...well judging on how hot its been thus far, I might should look into something fairly large. What if i use it in coordination with the aux. fan that's already there?

the aux fan is extremely loud and draws a lot of power. I'd look for a bigger puller fan if you want some margin of safety. If you have no A/C, I'd remove the stock aux fan altogether and use the wiring harness and relays to drive your new fan, with the lower temp thermoswitch from an E36 M42 car.

[Wh33lhop]

pusher - 2000cfm
puller - 1600cfm

they're really only needed when idling in traffic, it will probably never come on with the car moving at any decent speed.

Where'd you stumble upon these numbers exactly? :p

[nando]

just a ballpark based on my experience; the pullers can be lower CFM because they're more efficient, and 2000cfm pushers seem to work fine with the AC condenser removed.

[JoeyBones]

the aux fan is extremely loud and draws a lot of power. I'd look for a bigger puller fan if you want some margin of safety. If you have no A/C, I'd remove the stock aux fan altogether and use the wiring harness and relays to drive your new fan, with the lower temp thermoswitch from an E36 M42 car.

well I can get a SCREAMING deal on a 16" fan but it only does 1500cfm. I was thinking about putting a kit together for everyone to replace the clutch fans with something that wasn't pulled from a junk yard for a reasonable price. It just appears it may be a tad on the low side for those who may really sit in hot situations...