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Fan height spacing.

A

Acesneights1

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While kicking around different fans and clutchs in another htread, I took a good hard look at both my trucks. One has stock fan and clutch, the other has the Heath. In my often futile attempts to build a better mouse trap I noticed that bothe the heath fan and stock are a pretty good distance from the rad. Probably about 2.5-3 inches. The stock fan blades are actually half in and half out of the shroud where as the heath fan is alomost completely inside the shroud. My question for the stong minds here is what's better ? To have the fan closer to the rad and completely inside the shroud or sticking half out of shroud. I'm thinking "possibly" being completely inside the shroud may cause turbulance ?? Or maybe being inside and closer is better to draw air ?
Opinions please. I don't want to pill the beans yet but I may have found a fan that will thread onto the late model WP,has good pitch and will sit about 3/4 inch closer to the rad.
 
The more i think about it i think it would be better to be half in and half out. The fan is still pulling all its air from the radiators surface area due to the shrowd. However maybe the circulation of air is easier with the fan half out of the shrowd..... Good question, im interested in others opinions also. When i get home around 5:30 tonight i will check my fan. (drove the mustang to work today).....
 
back when I was plowing with a gasser 350, I found that spacing the fan closer to the radiator worked better than not spacing it as far, but that was with a clutchless fan, I am not sure if that would effect the outcome....
 
I think half in half out is ideal. that way the exhaust has no pressure, and the shroud acts like a perfect, airtight funnel.

That's my opinion, and I'm sticking to it.
 
You know that is not entirely impossible. I just so happen to have a fog machine from my band days. Of course wether it works or not is another question.
 
OK No secrets here. The Factory fan off a Ford v10 triton has,according to the book, the same rotaion and hub size as ours. the difference is the fan height. The clutch is 3/4 inch longer on the Triton fan and of course the bolt pattern on the fan blade is differnt but the triton fan blade in itself is pretty beefy. It has 8 blades, 20 in , plastic, and looks like it has nice pitch to it. I was thinking of buying a used one from the junkie, and if it fits and looks better than what I'm using then replace the clutch with the Hayden 2836 which is the severe duty clutch but it will sit the fan closer to the rad. SO am I insane or am I onto something ?
All the trucks at work have v10s so I was able to measure one. Local junkie wants 100$ for a used one.
 
Matt Bachand said:
I think half in half out is ideal. that way the exhaust has no pressure, and the shroud acts like a perfect, airtight funnel.
Click to expand...


Impellers on Jetskis and pumps have almost no clearance, and very high
efficiencies - as long as the fan blade is not completely inside the shroud,
the closer to the radiator, the better, at least at low speeds.
Allowing for clearance for drivetrain movement and fan flex, of course
 
well that's what I'm not sure of. it it was actually in past the shroud a little maybe it would create turbulence ??
where's Turbine Doc ??
 
Or will it not make a difference?

Or perhaps one method would allow free flowing air to pass-thru better than the other? Meaning less cooling until fan is engaged.
 
well I am going to see what the junkies return policy is. Maybe if i can return the fan I'll buy it and take a shot. I in the meantime ordered the 2840 cluth for my 2000. Gonna put that clutch with the fanblade from the 2000 on my Tahoe and the dmax Heath fan on the GMC and see if there is any difference on either truck since they both run hot towing.
 
Acesneights1 said:
well I am going to see what the junkies return policy is. Maybe if i can return the fan I'll buy it and take a shot. I in the meantime ordered the 2840 cluth for my 2000. Gonna put that clutch with the fanblade from the 2000 on my Tahoe and the dmax Heath fan on the GMC and see if there is any difference on either truck since they both run hot towing.
Click to expand...

Keep us posted on your quest, Kenny.....

By the way, I saw a guy that looked just like you today, but he was driving a light blue gasser chevy.....?
 
Yep. Can't get the town to buy me a diesel. That truck will actually be going on the auction block soon. It has 117k and runs and drives like brand new.
 
Think you are reinventing wheel here, I just ran back from Ga yesterday afternoon, 1st run since installing ATT on the Burb it was 101F outside, and when I pushed it to 111 mph, (5mph gain over the GM-8/TM max mph on 86F day BTW at 100% load and 100% APP, vs on a 101F day and 100% load with 91% APP ) 257 IAT, a/c on; coolant was 208F Burb has dual OEM stats, Plastic fan, Bills pump and fan clutch, rad and a/c core were deep cleaned last summer, guys do what you will but cooling recipe Bill has laid out works.

When all this cooling discussion came up yet again as it does every summer like clockwork, I spent some time with Mr. Bill on the phone, externally the waterpump and fan clutch he uses looks like stock GM, internally there are some differences, p/n on bodies are the same, but clutches are filled with a mil spec fluid which operates differently than commercial fluid, maintains viscosity longer, and the pumps are orificed in such a way that balances flow better through the heads. If you want details call Bill, as I'm apt to repeat back something wrong, or you can take his word/mine system works just install it.
 
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