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Old 02-16-2007, 11:01 PM
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ignition, electric fan question

ignition: they say the stock ignition in my 96 Jeep is more than adequate for being pretty much stock (so it has an exhaust and a bigger hole in the airbox)

I thought since a high power ignition system creates a hotter spark it would be capable of jumping a larger gap. So... gapping the plugs slightly more (how much I do not know going from OEM to performance stuff) would create more spark area, more fuel ignited, resulting in a quicker burn for the rest of the fuel making it more efficent.

Am I right?

electric fan: Yup my Cherokee has the mechanical fan. It also has a electric fan as an auxilary. I'd like to switch to full electric. If anyone has done it (in anything) let me know what gains in mpg/performance you got. Thanks!
-Matt

p.s. does anyone know the dimensions of the fwd Monte Carlo/Impala fans, if they're different from regular and SS (with the SC3800 engine, not the gen3 sbc) models?

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Old 02-18-2007, 01:24 PM
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Spark plugs YES.

Trick sparkplugs try to enhance the flame kernal for better mixture light-off.

My Ford 5.0 SFI distributor experience shows me that when a gap wears to about .085 then misfire occurs. Obviously if you start with a wider gap, the sooner you have to change plugs.

Fan= you will not notice the power or mileage difference. Stick with the mechanical fan (if the thermostatic fan clutch is good) or you could cause cooling system problems. The manufacturers did a good job of designing the cooling system.
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Old 02-24-2007, 06:55 PM
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If you want to try an electric fan you might be able to find a relatively cheap setup in the junkyard. Early 90's Taurus's with the 3.8L six had a two speed fan that is very effective, and mid nineties Ford Windstar's with a 3.8L had a dual fan setup that flows about the same. They flow more air than just about any of the aftermarket fans you could find.

There are usually several of these on Ebay, and quite a few in most junkards. One setup has a slightly wider shroud than the other so you will have to check the fit with your radiator. Also remember that you need a high amp fused wire to the battery and relays to run these fans, since they flow more and draw more than your stock auxiliary fan.


Bruce
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Old 02-24-2007, 08:18 PM
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Quote:
Originally Posted by 75gmck25
Also remember that you need a high amp fused wire to the battery and relays to run these fans, since they flow more and draw more than your stock auxiliary fan.


Bruce
Bruce is right...use the proper size wire and do use a relay....You do not want to burn your car up just because you put on an electric fan.
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Old 02-27-2007, 12:48 PM
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I got a derale electric fan harness that ties into the a/c and has it's own adjustable tstat for this.
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