Electric Pusher Fan? - JeepForum.com

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post #1 of 22 Old 07-01-2013, 04:04 PM Thread Starter
jp360cj
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Electric Pusher Fan?

I've been having trouble keeping my AMC 360 cool on the trail. It does fine on the road, staying around 190-195 with a 185 t-stat. But when I hit the trail it runs around 215 to 225. I'm currently running a mechanical fan (no clutch) and no shroud. I plan on getting a fan shroud, but have also been thinking about adding a pusher fan. Do they really help, or a waste of money? What have yall been using for a pusher setup?


77 CJ-7- AMC 360, Edelbrock cam, MC2100, Fenderwells, CJ T18/D20, Chevy D44/EB 9" rear, Trutrac f/r, 4.11, SOA, 1.25 lift shackles, 35x12.50 BFG KM2s, Shackle Reversal
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post #2 of 22 Old 07-01-2013, 10:44 PM Thread Starter
jp360cj
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Anyone?

77 CJ-7- AMC 360, Edelbrock cam, MC2100, Fenderwells, CJ T18/D20, Chevy D44/EB 9" rear, Trutrac f/r, 4.11, SOA, 1.25 lift shackles, 35x12.50 BFG KM2s, Shackle Reversal
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post #3 of 22 Old 07-02-2013, 05:40 AM
GP_Pete
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You'll be amazed how much difference a shroud makes. Do that before you spend money on a second fan. Also make sure your radiator is up to par
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post #4 of 22 Old 07-02-2013, 05:57 AM
wblackm
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Check your radiator 1st, like has been mentioned above.

The pusher fan will help, your clutch fan speed is tied the engine RPM. At low RPM(I.E. on the trail) the fan spins at a lower RPM. An electric fan spins at speed regardless of engine RPM.

However, unless you are doing something off the charts strenuous-or your 360 is making massive HP, I think this overheating is a product of either old fluid, a clogged radiator, or a damaged fan clutch. Did you put in a new radiator when you did the engine swap?
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post #5 of 22 Old 07-02-2013, 06:34 AM
GP_Pete
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OP said no fan clutch. That might be a good thing to add too. Go back to the stock setup (for a 360).

Also noticed he has headers. More heat in the engine compartment.

But again. Check the radiator. Get a shroud. Fan clutch.
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post #6 of 22 Old 07-02-2013, 06:52 AM
wblackm
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Ha, missed the parenthesis thanks.

Another thought, that may or may not apply to the 360 is water pump rotation(those with 360 experience please advise to if this is even a possibility). I know on the straight 6's there was a water pump that everything on it was the same except the rotation...If buying refurbs especially, one needs to be very sure to double check the impeller for proper rotation-in case the store had mistakenly swapped them.

The impeller could also be worn out if a water pump has not been installed in a while. At higher RPM there is enough to move enough, but at lower RPM it could be lacking.
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post #7 of 22 Old 07-02-2013, 08:17 AM Thread Starter
jp360cj
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Will be ordering a shroud very soon. Does anyone know if whether or not I have a fan clutch make a difference on the shroud? I'm sure the clutch would make the fan closer to the radiator, but don't know if that would matter.

Would adding a clutch really help? Unless there is something in the clutch to make the fan spin faster, its not going to move any more air and just be another part to wear out.

Radiator was replaced 6 or 7 years ago and water pump is about 4yrs old. As soon as I get off the trail and start moving even 25-30mph it cools down almost immediately. This is at the same or lower rpm than on the trail. That's why I was thinking its an air flow problem.

77 CJ-7- AMC 360, Edelbrock cam, MC2100, Fenderwells, CJ T18/D20, Chevy D44/EB 9" rear, Trutrac f/r, 4.11, SOA, 1.25 lift shackles, 35x12.50 BFG KM2s, Shackle Reversal
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post #8 of 22 Old 07-02-2013, 09:24 AM
LumpyGrits
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You may need to have some hood vents put in so the hot air can get out.
X 100 on a shroud.
LG
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post #9 of 22 Old 07-02-2013, 09:38 AM
GP_Pete
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Someone correct me here, but i thought a fan clutch was a temperature-managed spring where the hotter it got the faster it engaged the fan. No?

Not sure about the water pump deal. Never had s problem w mine.

Out of curiosity..... Did the OP do the 360 swap? Or was it a previous owner? I have seen people keep their old i-6 radiator and it just didnt keep up w the 360 when running under load.
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post #10 of 22 Old 07-02-2013, 09:52 AM
lucdog
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You said you have a fixed fan, I need to know exactly what fixed fan you have. Stock or aftermarket? It does make a difference.
Also, if the engine is idleing in netural, do the temps run up over 200/215?

Bill

1957 WILLYS pickup,
1973 J 4000,
1978 CJ7 DD.
1979 CJ7 360, TH400/Quadratrac.
1979 J20
1980 CJ5 trail Jeep.
1983 CJ7
1989 YJ the CJ to YJ.
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post #11 of 22 Old 07-02-2013, 09:55 AM
LumpyGrits
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7 yo rad needs to have a 'rod-out' done.
When you refill, use distilled water with the coolant. NOT tap water.
LG
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post #12 of 22 Old 07-02-2013, 09:56 AM Thread Starter
jp360cj
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I swapped in the 360. The radiator is a 3 core for a 304. It should have plenty of cooling for the 360 according to my local radiator shop.

As for the clutch fan, I just don't see it having any kind of overdrive in it that would allow it to turn faster than the pulley.

LG, I have thought about hood vents, but really don't like the look. If I have to I will, but don't want to

77 CJ-7- AMC 360, Edelbrock cam, MC2100, Fenderwells, CJ T18/D20, Chevy D44/EB 9" rear, Trutrac f/r, 4.11, SOA, 1.25 lift shackles, 35x12.50 BFG KM2s, Shackle Reversal
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post #13 of 22 Old 07-02-2013, 10:01 AM
LumpyGrits
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Pull the rad and do a rod-out
SHROUD!
LG
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post #14 of 22 Old 07-02-2013, 10:04 AM Thread Starter
jp360cj
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It's the stock fan. Sitting at idle it runs 195 to 200. But when it starts to run hot, it won't cool back down idling. Idle is 750-800rpm.

77 CJ-7- AMC 360, Edelbrock cam, MC2100, Fenderwells, CJ T18/D20, Chevy D44/EB 9" rear, Trutrac f/r, 4.11, SOA, 1.25 lift shackles, 35x12.50 BFG KM2s, Shackle Reversal
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post #15 of 22 Old 07-02-2013, 10:06 AM
LumpyGrits
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Here's the vent I use.
Put it at the back of the hood near to cowl.
http://www.genright.com/ProductInfo....ductid=LVR1011
I can feel the trapped air being push out of the vents. It does a great job.
LG
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