+1. Imo, unless there is a necessissity for the fan dont worry about it. The fan is heavy yes, but once its moving centripital forces help to continue its movement. About the only reason I want one is to have the ability to keep it on after the truck is off to help cool the radiator and trans. I also wouldnt recomend going with a flex fan unless you can check the angle of the blades. I have no idea the direct relationship btwn the angle of the fans and the flow capicity. My experience with them has been that they are usuially angled more shallow than the stock blades and have given me cooling issues after installing them.

 

I don't know man... we are comparing the fan on a RX-7 to that of a Ram??? Who knows how it operates. The fans on TrailBlazers are a hybrid of electrical and clutch control. If the RX-7 fanis like that then there would be no benefit to changing over to an electric.

The thing I like most about my e-fan is how much easier it made my life when ever I need to work on my truck. Pop the washer tank off, remove four bolts, disconnect the rad overflow hose, remove shroud assemblyand bang... the entire front of your engine is easily accessible. This is nice after you get the "modbug".... lol...

It also does a great job of stabilizing my coolant temp.

It did NOT give me the boost in horsepower I was hoping for... but niether did the Fastman T-Body, CAI, Pulley Set or complete exhaust. So far the only mod that has impressed me has been the 1.7 rockers.... totally goin by seat of the pants.

 

Thanks for the info on e-fans guys. You made me take a second look at my "mods" wish list.

 

another not-so-well-known option
is to replace the silicone fluid
in the viscous clutch fan
with a thinner fluid formulation.

this allows the fan blades to slip more when unlocked
and use slightly less horsepower

The 4.7 V8 viscous clutch slips at a lower rpm
than 3.9/5.2/5.9 Magnums

 

If you are looking for horsepower increase first and foremost... then I would suggest popping off the clutch fan and takin her out for a spin. See if its worth it to you. I believe someone else suggested this earlier in the thread or in another one on this forum. It makes sense. Just don't get caught in traffic on a hot day

I like mine.... and would do it again. I use the SPAL controller (Hank posted it earlier in the thread).You can tap into theOEM temp sensor wire coming off the intake manifold or install your own temp sensor somewhere elseto give the controllerits temp reading.

I should have mentioned that I am looking for more low end grunt at highway speeds.... thats why I have not been impressed with most of the modsI have performed so far. My truck seems to come to life after 2200 RPM. My current setup has me cruising at around 75-80 mph @ 2200 RPM.... ummmm no thanks. Seems like I will need a set of gears to take advantage of the power curve produced by this engine. SomethingI really did not want to get in to just because my driveline has given me 0 issues. But I guess its either gears or a 408 stroker

My truck is a short box and short bed by the way.

 

So basically if im going to switch to an e-fan, make sure the blades are angled a good amount so they acutally meet or perform better than the stock?

 

a lot of people

I cant guarenty that it will, but if you get a decent sized fan it shouldnt give you any cooling issues. My pref is out of mid sized fords. They are cheep and easy to come by, as well as having a high and low setting.

 

 

lol, ok.

 

I agree with the simple idea
of taking your stock fan blades off
and doing a test run to time some accelerations.

Even better,
get a buddy with a Ram
and do a careful MPG test with
one truck running without the fan for the first part of the test,
then switch.