The electrical system is marginal in the fc's as is, and the enormus electric fan that i'm currently running is a huge draw and puts out a whopping 2700cfm, overkill, I know.



Before I hear about how the stock clutch fan is best I am curious about running a flex-fan as an alternative, I haven't seen many of them on FC's, or any other rotary powered cars for that matter, and am wondering if it's the rpm limits that the flex-fans have that shy people away? Is the water pump pulley not underdriven enough to accomodate the fan? Any info is appreciated.

 

most flex fans are rated for 10,000 rpms, not really sure why there hasnt been much discussion or application on them?



if the waterpump can run the stock fan, why not a flex

 

[quote name='Rob x-7' date='Jul 12 2005, 07:13 PM']most flex fans are rated for 10,000 rpms, not really sure why there hasnt been much discussion or application on them?



if the waterpump can run the stock fan, why not a flex


[/quote]



That's what I was thinking, the waterpump pulley can't be 1:1 so even if someone missed a shift, bounced off a rev limiter at 10K, as a worst case scenario the fan shouldn't scatter, and it shouldn't make the car run too cold either.



Is this the wrong line of thinking?

 

If you thought your clutch fan dogged your car just wait untill you get a flex-fan, just think about you clutch fan running all the time multiply it by to or three and thats what a flex-fan does. They do a damn fine job with cooling though.

 

[quote name='fc3s4utnv' date='Jul 12 2005, 09:54 PM']If you thought your clutch fan dogged your car just wait untill you get a flex-fan, just think about you clutch fan running all the time multiply it by to or three and thats what a flex-fan does. They do a damn fine job with cooling though.


[/quote]



lol, i'm not all that concerned with anything other than the fan staying intact and not overcooling to the point that it takes away from the tuning. I'm not trying to run 9's in the quarter or auto-x the wheels off of it, it's just a cruiser, dependable, nice stereo system, etc. The no bullshit race ready version project car is down the road a while, for this one I just want simple, easy, turn key, go.

 

it operates off the waterpump pulley which has to spin, and it even outs at certain rpms or with the right air flow so it doesnt always create drag

 

What's a flex fan?

 

One of these...

 

I thought those were known as finger choppers.



They work of a pulley?

 

The stock fan clutch is a torque converter type.

When rhe radiator is hot, it speeds up with engine revs to about 4K, then maintains that 4K load as the engine revs higher.



The flattening or feathering design of the flex fan is an "almost as good" way to reduce high rev torque loads.

The down side is it runs even when the radiator is cold.