Cooling ??????

i am going to be installing my new 351w this weekend and i want to get rid of my belt driven fan, i have a 302 radiator i will be installing and was wondering what kind of electric fan would be up to cooling my motor properly what size and cfm is recomended? thanks

 

I have a 2900 cfm Perma Cool unit. Doesn't run too often, but when it does it works great.

 

I have a "Ramcharger" dual electric fan (can't find the website right now).


I've heard good things about Lincoln Mark 8 salvage yard finds too. Supposed to move a good bit of air and is relatively inexpensive (a lot of the Mustang guys use them).

 

the best fans I have seen are from a Linc Mark VII. They are reported to pull 5000 cfm. They do however, pull 38 Amps at startup so you need a 70 Amp relay.


I have one on a 502/502 Chevelle, with A/C, and it cools under the hottest Florida sun.
I would keep the stock fan, if everything fits. the electric are fine from the factory, but are complicated to add, aftermarket. relays, thermostat, got to wire to the a/c

 

I've got a electric fan from a 89 model Taurus with a V6. It is a two speed model. With a little trimming, two pieces of 1" angle, and 6 pop rivets - the shroud covers the entire Maverick radiator. I have the high speed hooked to a thermocouple mounted in the radiator and it kicks on 195 deg. The low speed is hooked to a switch under the dash so I can run the fan in the pits or staging lane. It is probably similar to the Lincoln one black396 mentioned. The low speed spikes about 20 amps then settles to 10 amps. The high speed spikes almost 60 and then settles to a little over 30 amps. Rather than forking out the dough for high current relays - I ran one 30 amp relay for the low speed and two 30 amp relays in parallel for the high speed. FordMuscle.com did a little write up on this conversion into a Mustang about a year ago. It might still be on the website. The low speed will hold temp (160) at idle in the staging lanes for a while but temp will eventually creep up. High speed drops temp easily - don't know the cfm. If anyone is interested I can get some photos.

Cleaver

 

It's usually not a good idea to run lower rated relays in parallel to power a single high current load. Relays don't usually have the exact same switching time and for a fraction of a second the faster relay will carry most of the inrush current. Could eventually damage the contacts.

 

for relays, please see, http://www.watsons-streetworks.com/brake_switches.html

 

My company builds, among other things, controls for automotive A/C systems. I get my relays and sockets for free.

:bananaman

 

Yea - good point about the relays in parallel. It does make sence that the system would be less reliable. I've actually never had a problem with doing this on several installations (mostly stereo stuff). I guess it is just a matter of time. I don't have a good free source or parts per say - but I pull relays , connectors, fuses, and harness chuncks from parts cars. There are probably 20-30 relays in the parts box and 3-4 handfulls of fuses. I think my garage would make one of those Learning Channel shows where the designers come in and clean out all the pack rat stuff and re-decorate My grandpa used to say "it is only junk until you need it".

Cleaver