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Re: Clutch fan recommendation needed
[Re: 6PAX]
#3215868
02/24/24 04:04 PM
02/24/24 04:04 PM
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Joined: Jan 2003
Posts: 5,439
So Cal
Sinitro
master
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master
Joined: Jan 2003
Posts: 5,439
So Cal
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After taking some time away from it, I'm finally working on finishing up my engine cooling. Turns out with the radiator I ended up using that I am going to need a shorter fan clutch. The clutch I have is about 3 5/8" in depth. With it, the seven blade fan I am going to use sits all the way into the shroud to where the back edge of the blades are flush with the shroud opening. So, it looks like I will need a clutch less than three inches in depth to get the fan blade half in and half out of the shroud. Who sells clutches that are less than three inches in depth? Most clutch fans available today for Mopar are too tall if U have installed bigger radiator... I have a couple of short height(2.75") mopars with the closed WP hub if U require one. Just send me a PM if any further interest... Just my $0.02...  I tried messaging you Sinitro but was unable to. Sorry never received any PM. Note I did post an ad in B Body Parts for a short height (2.75") clutch fan... Just my $0.02..
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Re: Clutch fan recommendation needed
[Re: Sinitro]
#3215882
02/24/24 05:08 PM
02/24/24 05:08 PM
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Joined: Jan 2003
Posts: 5,613
Detroit area
6PAX
OP
master
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OP
master
Joined: Jan 2003
Posts: 5,613
Detroit area
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Sorry never received any PM. Note I did post an ad in B Body Parts for a short height (2.75") clutch fan... Just my $0.02.. You didn't receive it because I couldn't send it. When I tried, I got a message saying "This user is not accepting Private Messages".
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Re: Clutch fan recommendation needed
[Re: Sinitro]
#3215883
02/24/24 05:12 PM
02/24/24 05:12 PM
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Joined: Oct 2003
Posts: 4,008
South Park, Pa.
68LAR
master
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master
Joined: Oct 2003
Posts: 4,008
South Park, Pa.
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After taking some time away from it, I'm finally working on finishing up my engine cooling. Turns out with the radiator I ended up using that I am going to need a shorter fan clutch. The clutch I have is about 3 5/8" in depth. With it, the seven blade fan I am going to use sits all the way into the shroud to where the back edge of the blades are flush with the shroud opening. So, it looks like I will need a clutch less than three inches in depth to get the fan blade half in and half out of the shroud. Who sells clutches that are less than three inches in depth? Most clutch fans available today for Mopar are too tall if U have installed bigger radiator... I have a couple of short height(2.75") mopars with the closed WP hub if U require one. Just send me a PM if any further interest... Just my $0.02... I tried messaging you Sinitro but was unable to. Sorry never received any PM. Note I did post an ad in B Body Parts for a short height (2.75") clutch fan... Just my $0.02.. As I stated previously, other than the.050” difference, the percentage of lock up is the only difference between the two HD will lock up tighter and cause a slight loss of horsepower. I would suggest the standard duty clutch and a 7 blade fan. More blades, better cooling. Just my 2 cents.
4 speed street legal. Best time 10.99 @ 124 mph on 93 octane pump gas @ 3926# total weight
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Re: Clutch fan recommendation needed
[Re: 6PAX]
#3215920
02/24/24 08:58 PM
02/24/24 08:58 PM
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Joined: Jan 2003
Posts: 5,439
So Cal
Sinitro
master
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master
Joined: Jan 2003
Posts: 5,439
So Cal
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Sorry never received any PM. Note I did post an ad in B Body Parts for a short height (2.75") clutch fan... Just my $0.02.. You didn't receive it because I couldn't send it. When I tried, I got a message saying "This user is not accepting Private Messages". No idea what happened.. Just double-checked and the Accepting Private Messages option is turned on. Just my $0.02...
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Re: Clutch fan recommendation needed
[Re: Sinitro]
#3215931
02/24/24 09:36 PM
02/24/24 09:36 PM
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Joined: Jan 2003
Posts: 5,613
Detroit area
6PAX
OP
master
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OP
master
Joined: Jan 2003
Posts: 5,613
Detroit area
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Sorry never received any PM. Note I did post an ad in B Body Parts for a short height (2.75") clutch fan... Just my $0.02.. You didn't receive it because I couldn't send it. When I tried, I got a message saying "This user is not accepting Private Messages". No idea what happened.. Just double-checked and the Accepting Private Messages option is turned on. Just my $0.02... Just tried again and now it works. 
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Re: Clutch fan recommendation needed
[Re: 68LAR]
#3216292
02/26/24 10:59 AM
02/26/24 10:59 AM
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Joined: Jan 2003
Posts: 74,978
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 74,978
U.S.S.A.
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As I stated previously, other than the.050” difference, the percentage of lock up is the only difference between the two HD will lock up tighter and cause a slight loss of horsepower. I would suggest the standard duty clutch and a 7 blade fan. More blades, better cooling.
Just my 2 cents.
I didn't realize that HP loss locked tighter , standard duty it is with a 5 blade fan
running up my post count some more .
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Re: Clutch fan recommendation needed
[Re: 6PAX]
#3216382
02/26/24 04:00 PM
02/26/24 04:00 PM
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Joined: Jan 2003
Posts: 74,978
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 74,978
U.S.S.A.
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2017 , is that the only failure you've found ?
running up my post count some more .
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Re: Clutch fan recommendation needed
[Re: 6PAX]
#3216557
02/27/24 10:34 AM
02/27/24 10:34 AM
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Joined: Oct 2003
Posts: 4,008
South Park, Pa.
68LAR
master
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master
Joined: Oct 2003
Posts: 4,008
South Park, Pa.
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So, if I understand this correctly, the 2947 clutch would cool better in city driving due to the higher percentage of engagement? I'm not concerned with hp loss as much as cooling efficiency. Also, I am uncertain about the number of blades on the fan. From what I've read here and elsewhere, some say the 5 blade is best while other say the 7 blade is better. I'm uncertain which combo to go with, 2965 or 2947 clutch with 5 or 7 blade fan.  This is correct, the HD clutch will cool better in traffic. The 7 blade will pull more air than the 5 blade. Example, if you look at a helicopter that is made to lift heavy loads, it has more blade than one that is not made to do so. Another example, look at OTR trucks. None that I’ve seen have less than 6 blades. Even newer passenger trucks have more than 5 blades.
4 speed street legal. Best time 10.99 @ 124 mph on 93 octane pump gas @ 3926# total weight
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Re: Clutch fan recommendation needed
[Re: 6PAX]
#3216791
02/28/24 12:00 PM
02/28/24 12:00 PM
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Joined: Jan 2003
Posts: 74,978
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 74,978
U.S.S.A.
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So, if I understand this correctly, the 2947 clutch would cool better in city driving due to the higher percentage of engagement? I'm not concerned with hp loss as much as cooling efficiency. Also, I am uncertain about the number of blades on the fan. From what I've read here and elsewhere, some say the 5 blade is best while other say the 7 blade is better. I'm uncertain which combo to go with, 2965 or 2947 clutch with 5 or 7 blade fan. This is a great subject, that came up at a good time, as I have been thinking about fans on my Factory Appearing build. I have a big block A body and standard its equipped with a 7 blade fixed fan with a 5/8" spacer , hoping that one of these short clutches fits and put the fan in a good spot within the shroud, otherwise a fixed 4 blade fan might be finding a home in it for racing.
running up my post count some more .
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Re: Clutch fan recommendation needed
[Re: JohnRR]
#3216832
02/28/24 02:48 PM
02/28/24 02:48 PM
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Joined: Jan 2003
Posts: 5,613
Detroit area
6PAX
OP
master
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OP
master
Joined: Jan 2003
Posts: 5,613
Detroit area
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This is a great subject, that came up at a good time, as I have been thinking about fans on my Factory Appearing build. I have a big block A body and standard its equipped with a 7 blade fixed fan with a 5/8" spacer , hoping that one of these short clutches fits and put the fan in a good spot within the shroud, otherwise a fixed 4 blade fan might be finding a home in it for racing. Been doing a lot of reading up on these clutches and the fans as well John. Right now, I'm leaning toward the 2947 clutch with a 7 blade fan unless someone convinces me that a different combo would be better. As I mentioned, I'm more concerned with cooling efficiency rather than hp loss.
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Re: Clutch fan recommendation needed
[Re: 6PAX]
#3216852
02/28/24 04:44 PM
02/28/24 04:44 PM
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Joined: Mar 2009
Posts: 2,459
Sydney,Australia
tex013
top fuel
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top fuel
Joined: Mar 2009
Posts: 2,459
Sydney,Australia
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This is a great subject, that came up at a good time, as I have been thinking about fans on my Factory Appearing build. I have a big block A body and standard its equipped with a 7 blade fixed fan with a 5/8" spacer , hoping that one of these short clutches fits and put the fan in a good spot within the shroud, otherwise a fixed 4 blade fan might be finding a home in it for racing. Been doing a lot of reading up on these clutches and the fans as well John. Right now, I'm leaning toward the 2947 clutch with a 7 blade fan unless someone convinces me that a different combo would be better. As I mentioned, I'm more concerned with cooling efficiency rather than hp loss. I use the Mopar Performance 5 blade works good for me . With an AFCO aluminium cross flow radiator and factory shroud . Tex
New best ET 10.259@129.65 .
New best MPH 130.32
Finally fitted a solid cam,
stepped it up a bit more
3690lbs through the mufflers
New World block 3780lbs 10.278@130.80 . Wowser 10.253@130.24 footbraking from 1500rpm
Power by Tex's Automotive
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Re: Clutch fan recommendation needed
[Re: tex013]
#3216856
02/28/24 05:02 PM
02/28/24 05:02 PM
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Joined: Oct 2003
Posts: 4,008
South Park, Pa.
68LAR
master
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master
Joined: Oct 2003
Posts: 4,008
South Park, Pa.
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This is a great subject, that came up at a good time, as I have been thinking about fans on my Factory Appearing build. I have a big block A body and standard its equipped with a 7 blade fixed fan with a 5/8" spacer , hoping that one of these short clutches fits and put the fan in a good spot within the shroud, otherwise a fixed 4 blade fan might be finding a home in it for racing. Been doing a lot of reading up on these clutches and the fans as well John. Right now, I'm leaning toward the 2947 clutch with a 7 blade fan unless someone convinces me that a different combo would be better. As I mentioned, I'm more concerned with cooling efficiency rather than hp loss. I use the Mopar Performance 5 blade works good for me . Tex I tried the MP 5 blade assembly a while back. Nice and quiet, lite, but didn't pull much air and hence, I had trouble keeping the engine cool. I believe it would be a good choice for a race only application. Not so much in a street/strip car. Again, just my 2 cents.
4 speed street legal. Best time 10.99 @ 124 mph on 93 octane pump gas @ 3926# total weight
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