Interesting Test on Engine Fans

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Interesting Test on Engine Fans

Postby lavron » Wed Aug 16, 2017 9:45 pm

I have been sitting watching Engine Masters, I had been debating what kind of fan to use, I think I know now :roll: well and the fact that I don't have a lot of choice in the limited space I will have.

https://www.youtube.com/watch?v=ZXdLgaFXZzs

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Re: Interesting Test on Engine Fans

Postby Comechero65 » Thu Aug 17, 2017 12:51 am

From what I saw watching that video it looked like the 'plastic' as they called was the one that took the least hp though they never actually admitted to that. Or if they said i missed it. I got that from watching the power runs and power curves. Only thing that was better was the no fan run. Was really surprised the fixed blade all metal was the worst one. I wonder if my 5 blade fans results in about the same hp loss.
In doing some searching on line could not find a plastic fan, what i did find were nylon. And they look similar to what they called plastic.
And they are not that expensive. Makes me temped to give one a try. What does anyone else who watched the video think?
Watched another episode of that show where they did a port match on some heads and intake. They picked up almost 100 hp with those changes. That was pretty impressive what a little honing and grinding can do.
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Re: Interesting Test on Engine Fans

Postby popscomet » Thu Aug 17, 2017 12:56 am

WE have found out on these race motors,,,plastic fans are the best,,,,someone told me or I read it ,that a metal fan like factory puts on ate 12hp.....just to spin it........pop
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Re: Interesting Test on Engine Fans

Postby Comechero65 » Thu Aug 17, 2017 12:59 am

If I remember right the all metal fan took something like 30 hp to run. man that's a big drop. Even the clutch fan was better.
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Re: Interesting Test on Engine Fans

Postby lavron » Thu Aug 17, 2017 6:50 am

I think the clutch fan was best in the test, it took a lot of RPM to get the plastic fan to flatten out because it was so stiff so it only had an advantage in the upper end.

When you have an engine as small as mine I can't afford 30HP so an electric one will go in there, they said at the beginning that an electric uses maybe 1HP or less from the draw on the alternator, plus, I don't think I will have the space for a fan anyway.

It was interesting that the shroud made no difference but I would be inclined to think it makes a difference in how well the system cools or manufactures would not go to the expense to put them on.

They have some good info in their videos you have to ignore that most of the time they are the wrong brand :roll: Heck for me they are even the wrong configuration because the best Ford engine has 6 in a row :lol: :lol:

I watched the header, X & H pipe and muffler comparison videos as well, I think there is a lot they prove in actual testing instead of what people just think something should do or how it changes performance.

I do think I will do an X pipe on my car because sound is important and they said (subjectively) that it droned the least and sounded the best.

See Ya,
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Re: Interesting Test on Engine Fans

Postby poboyjo65 » Thu Aug 17, 2017 12:56 pm

I wish they would have did a run with the clutch fan hot. who cares what it does cold :roll: I'd guess its' numbers would be more closer to the others if it was hot. I wrote down the HP numbers;

no fan 349
cold clutch- 335
lo profile alum- 328
plastic- 325
steel- 318

steel/no shroud was 326. it made 8 more HP without the shroud. which make sense, it forces the fan to pull air thru the more constricted radiator. Makes me glad I made my shroud quick & easy to remove, if I ever go to the strip I'll take it off! :D

I think he meant to order a metal flexfan like I have when he got the lo pro alum one. but probably good that I dont know how much hp I'm losing with it. :lol: :lol:

I also wish they would do another test to see which one pulled the most CFM.

I have a nice electric fan but dont have room for it. the ones I have seen on comets/falcons are duel fans so the w pump snout can go between them & they are on much wider rads than stock. You gotta be careful when buying an electric one & pay attention to how much CFM they put out. the thin ones with no shroud generally dont pull many cubic feet per minute (cfm)
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Re: Interesting Test on Engine Fans

Postby lavron » Thu Aug 17, 2017 1:12 pm

poboyjo65 wrote:I think he meant to order a metal flexfan like I have when he got the lo pro alum one. but probably good that I dont know how much hp I'm losing with it.


Yes that is what he said, I was really surprised at how much drag they cause, I never really thought about it too much.

See Ya,
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Re: Interesting Test on Engine Fans

Postby Groover » Thu Aug 17, 2017 1:30 pm

I found this video interesting as well. I also liked the "Headers and Hammers" video.

Can we assume that the HP gained/or lost is proportional to the engine displacement/HP?

That is to say that while this costs or saves 30 hp on a 350 chevy, it would cost or save proportionally less on a 260 SBF.

?
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Re: Interesting Test on Engine Fans

Postby Lip Ripper » Thu Aug 17, 2017 1:34 pm

So my antiquated Fomoco clutch fan is still king after 51 years.

While on this HP robbing thing. The Falcon will have electric fan power only and the under drive pulley set. I'd be curious to see that on a before and after pull. Ain't gonna happen though. Hell I may get this 5.0 roller up to 90HP before all is said and done.

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Re: Interesting Test on Engine Fans

Postby poboyjo65 » Thu Aug 17, 2017 1:39 pm

Lip Ripper wrote:So my antiquated Fomoco clutch fan is still king after 51 years.

Stacey


when it is cold it is king, but we dont know how it would do hot since they didn't test it hot. most of us dont have room for a clutch :( .
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Re: Interesting Test on Engine Fans

Postby Comechero65 » Thu Aug 17, 2017 1:55 pm

Well I was wrong on the plastic fan being the least hp loss though at the lower rpms around the peak torque speed it wasn't to bad. Just dropped off badly around the 5200 area. But since i never hit those high rpms it isnt as important. I could live with that.
I also wish they had tested the clutch fan with it hot which would be more realistic test. Had they done a hot test I feel it wouldn't have done much better than the fixed all metal factory type fan.
All their tests makes it look like the electric fans are the way go as the added electical load wasn't nearly as bad.
When they did the test with no shroud it's obvious the hp loss was less since the fan is pulling or recycling some of the underhood air so not all is coming through the rad hence a little less friction.

It's making me rethink what I'm running now and consider trying some other fan setup. Though I don't have the dyno setup for trying something else and as long as it causes no overheating condition may help to know what will still work.
Ron
Last edited by Comechero65 on Thu Aug 17, 2017 2:04 pm, edited 2 times in total.
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Re: Interesting Test on Engine Fans

Postby Lip Ripper » Thu Aug 17, 2017 2:00 pm

I really only notice my fan clutch engaging in town and namely when stopped. Reference there, the Cyclone. And really, unless you're a horsepower junky like myself, it really doesn't mean that much.
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Re: Interesting Test on Engine Fans

Postby Comechero65 » Thu Aug 17, 2017 2:09 pm

Years ago I had a motorhome with a 454 with a clutch fan. Can't say I noticed any loss of power when the fan clutch was engaged but I always knew when it was by the sound. More so after I installed a heavy duty clutch on the fan. Always sounded like the trans was slipping which it wasn't.
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Re: Interesting Test on Engine Fans

Postby poboyjo65 » Thu Aug 17, 2017 2:16 pm

When I was building my shroud I ran across a place that built shrouds & they had made a fan dyno for testing. I have always heard that you need the fan half in & half out of the shroud. However! I noticed that all of the pics of the shrouds they built the fan was all of the way IN the shroud. Even though they never mention that, or at least I never read anything mentioned about it, not one of his pics had the fan sticking out ...at all. maybe it was his secret? but anyway I built mine like his :lol: here is the site;
http://www.mahaffeymotorsports.com/FanShrouds.htm
The way I see it, he has most likely tested & figured out they pull more cfm with the fan all the way in.

here are some of the ones he built,all have the fan all the way in the shroud;
http://www.mahaffeymotorsports.com/FanS ... tomers.htm
Last edited by poboyjo65 on Thu Aug 17, 2017 7:36 pm, edited 1 time in total.
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Re: Interesting Test on Engine Fans

Postby Comechero65 » Thu Aug 17, 2017 2:30 pm

I too have always heard the fan blade should be half in the shroud and half out but never seen any data to substantuate that. Just what everyone says. So I set mine up close to that. Don't have much room to do otherwise or get the fan further into the shroud. About all I could do would be to extend the shroud further out as the only choice. So far it works ok so don't know if it's worth the time experimenting any further.
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