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#1
11-06-2014, 03:41 PM
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Flex fan and fan clutch
Can you put a fan clutch on an aftermarket flex-fan? I would like to cut down on some of the noise coming from the fan.
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#2
11-06-2014, 05:24 PM
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What you really need is a 7 blade flex fan. Are you running a 6 blade fan? If so, yes they are noisey. Flex a lite makes a 7 blade fan, I think the PN is 1818. It pulls a ton of air and is virtually silent. You can also go through the scrap yards if thats your thing and find a factory 7 blade flex fan. I actually prefer a clutch/fan set up, but my 7 blade flex fan out cools it.
__________________
1971 Base Firebird..505ci IA 2A Round port E-heads by Butler 348 cfm.. Comp street SR 266/272@.050 Victor intake/Quick Fuel Q950. 1 7/8" Dougs headers..3" mandrel bent exhaust with Hooker Max Flow mufflers, T-350 well built with 10" 4000 stall nitrous Continental converter..3.73 posi . Caltracs and 10" slicks. Belt driven water pump, alternator, Pwr steering and brakes,Flex fan. 11:1compression, straight 93 octane pump fuel. 10.35 @ 129.88 with 1.45 60ft N/A at 3700lbs race weight. |
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#3
11-07-2014, 11:15 AM
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i am wondering if I really even need a flex fan in the first place, it came on the car from the prev. owner. It never even gets to 180 degrees most of the time.
What fans from other cars will fit on a Pont. 400 engine? Many caprices, malibus, regals, etc. in the salvage yard near me |
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#4
11-07-2014, 11:23 AM
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I guess you could, but you would cancel out the engineering of the flex fan. If it's too loud, replace it with a factory 7 blade flex fan. I put a junkyard 7 blade 18" flex fan on my '67 GTO about 25 years ago, and it works great. It came off of a '69 Cadillac. No noise at all, and pulls a ton of air. The flex a lite 6 blade that used to be on my '65 sounded like a 1980's Mercedes or a Garbage truck....you couldn't hear the engine over the fan noise. A 19" clutch fan fixed that. Both cool just fine.
__________________
Jeff 
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#5
11-07-2014, 08:44 PM
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Would a 1818 fan work in a 69 got or should it be 19"
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#6
11-07-2014, 08:56 PM
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Or would this one work. Although it is a six blade.
https://www.flex-a-lite.com/belt-dri...-flex-fan.html |
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#7
11-07-2014, 11:34 PM
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One thing that makes a fan noisy is evenly spaced blades. You want irregular spaced blades. Thats why its noisy, like a airplane propeller. Those gaps in OEM fan blades are not there so you can get at the bolts, they are for noise reduction ; )
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#8
11-08-2014, 08:22 AM
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Quote:
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#9
11-10-2014, 05:10 PM
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"Would a 1818 fan work in a 69 got or should it be 19"
When I installed the 1818 on the bird, it had more clearance at the shroud to fan tips. It may not be ideal, but it draws an incredible amount of air. If you have a 4 or 5 core, it is pretty much needed to get the air through the thick core. The web site for this fan actually states that these fans are for 4 or 5 core radiators. The six blade fan will be noisey period! Like a previous poster stated, the uneven blades are engineered to cancel the noise. My bird does not have any type of front spoiler to direct air into the grill are, and I believe this is why it was running hotter than normal with the clutch fan. It ran hot during low speed driving where the engine was spinning fast enough to disengage the fan and the forward speed of the car would not provide enough air through the grill.
__________________
1971 Base Firebird..505ci IA 2A Round port E-heads by Butler 348 cfm.. Comp street SR 266/272@.050 Victor intake/Quick Fuel Q950. 1 7/8" Dougs headers..3" mandrel bent exhaust with Hooker Max Flow mufflers, T-350 well built with 10" 4000 stall nitrous Continental converter..3.73 posi . Caltracs and 10" slicks. Belt driven water pump, alternator, Pwr steering and brakes,Flex fan. 11:1compression, straight 93 octane pump fuel. 10.35 @ 129.88 with 1.45 60ft N/A at 3700lbs race weight. |
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#10
11-11-2014, 08:02 PM
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http://www.ebay.com/itm/Car-Quest-77...6ea745&vxp=mtr ignore the warning stickers unless running @ 8000 rpms. as today people will sue over anything , even a hot cup of coffee .
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#11
11-12-2014, 09:45 AM
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I was looking at the local salvage yard yesterday at all the caprices/cadillac/monte carlos, etc. They all seemed to have the same fan except some had fan blades with curved edges and some had straight blades. Which one is the noisy/heavy duty fan?
All seemed to have unevenly spaced blades, but weren't the fans in the Caprices, etc. pretty noisy if I remember right? |
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#12
11-12-2014, 11:52 AM
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Actually now I'm not sure if it is aftermarket or not just that the prev owner said so. Here are pic:
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#13
11-12-2014, 08:13 PM
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Non stock the holes are elongated / stock fans are exact hole pattern .
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#14
12-17-2014, 04:57 PM
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I installed the 1818 Flex fan and I noticed right away how much more air it moved in the engine compartment. Will see how it works in heavy traffic on the road. Way more air movement.
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#15
12-18-2014, 09:25 AM
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Can anyone identify which one I have based on the previous pic? Not sure if it is a flex fan or not tho def not stock.
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#16
12-19-2014, 12:11 AM
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Quote:
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#17
12-20-2014, 09:55 AM
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