Re: mechanical fan vs electric
[Re: mopar dave]
#2247079
02/04/17 10:18 AM
02/04/17 10:18 AM
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Joined: Jan 2003
Posts: 2,924 A shed in England
Tig
master
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master
Joined: Jan 2003
Posts: 2,924
A shed in England
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Word of warning, we bought an Ebay unbranded chinese electric fan to supplement the stock fan on our mild small block a body build, just in case we needed it. Never had to use it. During a burn out, the stock fan pulled enough air to exceed the electric fans safe working RPM and it promptly exploded taking out the radiator and part of the grill. Messy Another point of note is we noticed the car would pick up on et and mph if the fan belt slipped those stock 8 bladers must take some power to turn at high (ish) rpm.
'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials. 9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge. RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03
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Re: mechanical fan vs electric
[Re: mopar dave]
#2247128
02/04/17 12:41 PM
02/04/17 12:41 PM
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Joined: Oct 2003
Posts: 7,506 Az
Crizila
master
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master
Joined: Oct 2003
Posts: 7,506
Az
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Remember you will be putting an additional 25 - 30 amp draw on your electrical system - at idle, which could necessitate an alternator change. If you have to run the fan with the engine off because of an over heat, you got "other" cooling system problems that you sure don't want to deal with on the street. Some of the HP losses quoted with a mechanical fan are way on the high side (IMO) and usually don't take in to consideration the HP loss caused by the additional 25-30 amp draw that the alternator has to supply. Due to clearance issues with my street rod, I have to run a 16" electrical fan. Draws 24 amps and I can actually watch the rpm drop when it kicks on. Unless it has been damaged, Flex fans are as reliable as any metal fans. Mine sees 7K at the track all the time.
Fastest 300
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Re: mechanical fan vs electric
[Re: mopar dave]
#2247156
02/04/17 01:22 PM
02/04/17 01:22 PM
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Joined: Jan 2003
Posts: 27,421 Balt. Md
383man
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,421
Balt. Md
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Ron, what radiator and shroud set up do you have? Dave its an Afco aluminum rad I bought from Mancini as I just told them it was a 63 Sport Fury and they new which one would fit. I did not want to spend the money most places wanted for a good shroud to fit as most wanted over $200 for a shroud ! So I went to the salvage yard and got a shroud from an early 90's Dakota and modded it some to fit. It works pretty good and was alot cheaper then the good ones they sell. Ron
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Re: mechanical fan vs electric
[Re: mopar dave]
#2247199
02/04/17 03:06 PM
02/04/17 03:06 PM
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Joined: Jul 2004
Posts: 19,318 State of confusion
Thumperdart
I Live Here
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I Live Here
Joined: Jul 2004
Posts: 19,318
State of confusion
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Dom, what size is that pump? I was looking at the summit pumps earlier and i think they are 35gal pumps. Would that be enough flow. The newer Morose say bet. 35-37 gpm and should be more that the old ratings based on what Moroso told me............The HHR fits perfectly on my 26" tank to tank Griffen..............
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: mechanical fan vs electric
[Re: mopar dave]
#2247227
02/04/17 03:57 PM
02/04/17 03:57 PM
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Joined: Jan 2003
Posts: 11,718 Portage,michigan
B3422W5
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 11,718
Portage,michigan
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I am soon going to install the updated Moroso pump and an electric fan on my 318 Moroso says 30-37 gpm, way more than the one they sold years ago that I used on my old car. And that one even worked decently on the street on a 9 sec car. Btw, my brother and I years ago swapped on electric water pumps and fans on our cars. Both were sorted out cars and we both picked up a tenth with zero other changes.
69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight 418 BPE factory replacement headed stroker, 565 lift solid cam Best so far, 10.40 @127 1/4 1.41 best 60 foot 6.60 at 103.90 1/8
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Re: mechanical fan vs electric
[Re: DrCharles]
#2247232
02/04/17 04:03 PM
02/04/17 04:03 PM
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Joined: Oct 2003
Posts: 7,506 Az
Crizila
master
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master
Joined: Oct 2003
Posts: 7,506
Az
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Some of the HP losses quoted with a mechanical fan are way on the high side (IMO) and usually don't take in to consideration the HP loss caused by the additional 25-30 amp draw that the alternator has to supply. Due to clearance issues with my street rod, I have to run a 16" electrical fan. Draws 24 amps and I can actually watch the rpm drop when it kicks on 30 amps at 14 volts is 420 watts. 1 hp = 746 watts. Allowing for alternator efficiency, belt frictional losses, etc. that's less than 1 hp to drive the electric fan. Even if that 45 hp from the magazine article is double what your experience is, I'll take 1 hp over 20 hp loss any day. The reason the RPM drops when that little load kicks on is that your idling engine is only making a couple of hp just to turn itself over, so the alternator load is a significant change... same thing happens on a non-computer-controlled car when the A/C compressor kicks in. Thank you doctor.
Fastest 300
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Re: mechanical fan vs electric
[Re: DrCharles]
#2247248
02/04/17 04:48 PM
02/04/17 04:48 PM
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Joined: Dec 2013
Posts: 4,684 Wichita
GY3
master
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master
Joined: Dec 2013
Posts: 4,684
Wichita
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On my 505" stroker, I run a 318 poly radiator from a manual trans car. No lower tank for the A/T. I run the Hayden short "Jaguar" 2765 clutch on a Mopar fan. I had them move the saddles back 1/2 inch when they rodded out the radiator. It not only keeps it cool at the track but in stop and go traffic as well. Surprised the heck out of me it works so well! No shroud either. I have friends with high dollar aluminum radiators, electric fans and water pumps that shake their heads...
For a water pump I used the 440Source pump and housing. NO thermostat!
'63 Dodge 330 11.19 @ 121 mph Pump gas, n/a, through the mufflers on street tires with 3.54's. 3,600 lbs. 10.01 @ 133mph with a 250 shot of nitrous an a splash of race gas. 1.36 60 ft. 3,700 lbs.
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