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clutch or flex fan
#1403769
03/17/13 02:03 PM
03/17/13 02:03 PM
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Joined: Mar 2009
Posts: 187
Ia
4spdana
OP
member
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OP
member
Joined: Mar 2009
Posts: 187
Ia
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i've seen dyno results for using a clutch fan over a solid steel fan. but how does a flex fan stack up to a clutch?
i have a small block i turn 7500 that i run on the street and a little at the strip.
what would work best , or should i use electric fans on radiator ?
suggestions?
Last edited by 4spdana; 03/17/13 02:04 PM.
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Re: clutch or flex fan
[Re: 4spdana]
#1403770
03/17/13 02:17 PM
03/17/13 02:17 PM
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Joined: Jan 2003
Posts: 21,076
Niles , Ohio
therocks
oh wait.but hey.lets see.oh yeah.
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oh wait.but hey.lets see.oh yeah.
Joined: Jan 2003
Posts: 21,076
Niles , Ohio
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Most will say a clutch fan or electric.Ive run stainless flex for at least 25 years.Never a problem.The one on my 440 sees hi RPMs all the time and is street strip.My kid runs one on his 413 also.Never any overheating problems and both have factory rads.Most people with overheating problems are after market rads and clutch or elec fans.A lot will say a flex requires HP to turn.My answer is if that is slowing you down you need more motor.Rocky
Chrysler Firepower
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Re: clutch or flex fan
[Re: 4spdana]
#1403771
03/17/13 02:20 PM
03/17/13 02:20 PM
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Joined: Jan 2004
Posts: 27,347
Today? Who Knows?
1_WILD_RT
Management Trainee
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Management Trainee
Joined: Jan 2004
Posts: 27,347
Today? Who Knows?
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Either a clutch fan or electric, I've seen the aftermath of a couple flex fans letting go... 7500 is twisting it up there, a clutch fan would probably only see 4500 or so, the flex would be directly driven & since the WP pulley is slightly smaller than the crank the fan may see 8-8500..  Lotta centrifugal force at that speed... Oh, BTW the one car I was riding in when it lost a fan blade at 80mph the fan blade exited the RF inner fender & cut through the tire... Driver skill keep things from getting very ugly that day...
"The Armies of our ancestors were lucky, in that they were not trailed by a second army of pencil pushers."
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Re: clutch or flex fan
[Re: 1_WILD_RT]
#1403773
03/17/13 03:12 PM
03/17/13 03:12 PM
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Joined: Jan 2003
Posts: 28,600
Shopping @ HoBo Fright
340SIX
Doc Flappergas's Evil Twin
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Doc Flappergas's Evil Twin
Joined: Jan 2003
Posts: 28,600
Shopping @ HoBo Fright
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Quote:
Either a clutch fan or electric, I've seen the aftermath of a couple flex fans letting go... 7500 is twisting it up there, a clutch fan would probably only see 4500 or so, the flex would be directly driven & since the WP pulley is slightly smaller than the crank the fan may see 8-8500.. Lotta centrifugal force at that speed...
Oh, BTW the one car I was riding in when it lost a fan blade at 80mph the fan blade exited the RF inner fender & cut through the tire... Driver skill keep things from getting very ugly that day...
I like the great hole they make coming out Fiberglass hoods, kinda like a large toaster
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Re: clutch or flex fan
[Re: 68LAR]
#1403776
03/17/13 03:44 PM
03/17/13 03:44 PM
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Joined: Mar 2009
Posts: 187
Ia
4spdana
OP
member
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OP
member
Joined: Mar 2009
Posts: 187
Ia
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thanks....Sweet B-body.
is it really 440 ci ?
how is it so fast?
Last edited by 4spdana; 03/17/13 03:46 PM.
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Re: clutch or flex fan
[Re: 4spdana]
#1403777
03/17/13 04:45 PM
03/17/13 04:45 PM
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Joined: Nov 2005
Posts: 1,943
San Angelo, Texas, U.S.A.
1968RR
top fuel
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top fuel
Joined: Nov 2005
Posts: 1,943
San Angelo, Texas, U.S.A.
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Quote:
thanks....Sweet B-body.
is it really 440 ci ?
how is it so fast?
If I remember correctly, there was an article in a Mopar magazine (or was it Car Craft?) a few years ago about 68LAR's car. My '68 Road Runner is kind of like the twin to his GTX (color, hood, 440, etc.). His ride is really nice.
Also, I run a flex fan and I've never had any heating/cooling issues.
"When I'm in a slump, I comfort myself by saying if I believe in dinosaurs, then somewhere, they must be believing in me. And if they believe in me, then I can believe in me." - Mookie Wilson
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Re: clutch or flex fan
[Re: 1968RR]
#1403781
03/17/13 07:20 PM
03/17/13 07:20 PM
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Joined: Oct 2003
Posts: 4,013
South Park, Pa.
68LAR
master
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master
Joined: Oct 2003
Posts: 4,013
South Park, Pa.
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Quote:
Quote:
thanks....Sweet B-body.
is it really 440 ci ?
how is it so fast?
If I remember correctly, there was an article in a Mopar magazine (or was it Car Craft?) a few years ago about 68LAR's car. My '68 Road Runner is kind of like the twin to his GTX (color, hood, 440, etc.). His ride is really nice.
Also, I run a flex fan and I've never had any heating/cooling issues.
Thanks, I appreciate the compliments.
It was 2004 when my car was featured in MOPAR MUSCLE. Some things have changed since then. Back then I was running in the very low 12's with a .040" over 440. Over the years I've changed a few things. I currently run a 493 stroker. The rest of the car is basiclly the same as back in 2004 except for a new interior and some suspension and transmission upgrades. I feel blessed that the car runs so good, especially being a heavy stick car. Just like back then and since I bought the car, I've done all of my own work except for the machining part.   
4 speed street legal. Best time 10.99 @ 124 mph on 93 octane pump gas @ 3926# total weight
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Re: clutch or flex fan
[Re: 68LAR]
#1403782
03/18/13 07:07 PM
03/18/13 07:07 PM
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Joined: Jan 2003
Posts: 5,330
Land 'O Lakes
RoadRunnerLuva
master
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master
Joined: Jan 2003
Posts: 5,330
Land 'O Lakes
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What about the MP "Viscous fan/clutch" kit... what RPM's is this fan good to? Is it a good setup for street/strip cars? Anyone here use this fan kit? 
Plymouth Makes It!
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Re: clutch or flex fan
[Re: 4spdana]
#1403783
03/18/13 09:38 PM
03/18/13 09:38 PM
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Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck
Not enough dumb comments...yet
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Not enough dumb comments...yet
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
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Quote:
thanks....Sweet B-body.
is it really 440 ci ?
how is it so fast?
It's a 440.... I hope to be in the 11.teens-20's w/ a stock stroke, stock 6-pack this year... 3.91's driven to the track and back... vroom vroom.
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Re: clutch or flex fan
[Re: RoadRunnerLuva]
#1403786
03/18/13 11:26 PM
03/18/13 11:26 PM
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Joined: Jan 2007
Posts: 7,664
IN
ahy
master
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master
Joined: Jan 2007
Posts: 7,664
IN
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Quote:
What about the MP "Viscous fan/clutch" kit...
what RPM's is this fan good to?
Is it a good setup for street/strip cars?
Anyone here use this fan kit?
I'm running that kit on a 496B engine with AC. Works great. I have a backup 7 blade fan I've never needed. Agree as many have posted, the clutch fans seem to take high engine RPM without coming apart like (some at least) flex fans do. The thermal clutch cuts down on HP loss.
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Re: clutch or flex fan
[Re: ahy]
#1403787
03/19/13 06:58 AM
03/19/13 06:58 AM
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Joined: Jan 2003
Posts: 21,076
Niles , Ohio
therocks
oh wait.but hey.lets see.oh yeah.
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oh wait.but hey.lets see.oh yeah.
Joined: Jan 2003
Posts: 21,076
Niles , Ohio
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I run Summits stainless 18 inch fan.Been on at least 15 years and still like new.The 440 sees over 7K all the time.Runs 180 all day long.Picked it up in their clearance for like 10 bucks.Rocky
Chrysler Firepower
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