New idea for running electric fans, how do I make it work?

[farside847]

Hmmm, trying to wrap my brain around this one. So the idea is to use
an electric fan instead of a engine driven fan to cool the system. This
in turn would tax the engine less and improve performance. You would
think this would be a popular mod if it had a decent increase. Does
anyone have any info on improves HP/Torque?

thanks!

[curbyk]

For informational value, some of the older farm tractors had no water pump and used natural circulation for cooling. I don't know how it works but have seen a couple.

[XXL]

Originally Posted by farside847

This in turn would tax the engine less and improve performance.

This is the interplanetary standard for almost all modern vehicles.

[BigDave]

Originally Posted by farside847

Hmmm, trying to wrap my brain around this one. So the idea is to use
an electric fan instead of a engine driven fan to cool the system. This
in turn would tax the engine less and improve performance. You would
think this would be a popular mod if it had a decent increase. Does
anyone have any info on improves HP/Torque?

thanks!

I have no idea what the stock fan and related assembly contributes to parasitic loss.

Given that it's pulley driven I would suspect you could see the same gains as installing an underdrive accessory pulley. Then add the fact that it is probably providing more resistance than an accessory when working to create air flow the gains would be more.

My truck seems to get about 9-10mpg regardless of whether I'm driving in town or on the highway. When I removed the stock fan that didn't change much. Of course I've got my foot stuck half way down the carb on most trips so it really doesn't matter much.

[XXL]

Originally Posted by krue

As far as flow without a pump, if the t'stat is open then as the water cools in the radiator it will become more dense, allowing it to sink and the hot water from the engine will rise. It's called natural circulation and is used in everything from nuclear reactors to furnace boilers.

Originally Posted by XXL

One word. Entropy.

[Gary]

I'd be interested in seeing a before and after dyno pull maybe.

[72MARIO]

I have read between 5-15 hp but that's at 5000 rpm+ Just numbers But a dyno run would be the best.


Hey XXL !

Think you could get some before and after dyno munbers for us ??

[Striker169]

Originally Posted by Dixiesys

http://67-72chevytrucks.com/vboard/s...d.php3?t=50085 is that the faq you're talking about? Yeah that looks easy enough to pull off. Reckon this mod would be good for a big block motor/headers/etc?

I have that on my BBC 454 and it kind of does it, but I have a smaller radiator soo I think that is my real problem