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Old 02-12-2012, 07:46 PM
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fan shroud

I Have A 1968 454 Bb Chev Camaro Coupe . It Has An Aftermarket Alloy Radiator. It Has A Plastic Fan Shroud Which Only Comes To The Front Of The 18 Inch Basic Or Mechanical Type Fan. The Engine Runs At Around 180 F When Travelling But Heats Up At Low Revs Or In Traffic. Should The Shroud Cover Part Of The Fan And How Much And How Much Clearance Is Best Around Tips Of Blades.

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Old 02-12-2012, 10:04 PM
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Set it up so fan blades are sticking out about 1".
What type of fan are you using. Stock, flex or thermostatic.
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Old 02-13-2012, 09:20 PM
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Fan Shroud

I Have A Stock 18 Inch Fan And A Viscous Hub.the Hub Appears To Be Working Correctly. I Was Also Thinking Of Having A Flat Rolled Section Where The Shroud Meets The Fan To Make The New Shroud More Ridgid. I Dont Know If This Will Effect Air Flow Around The Fan. I Live In Tropical North Queensland Australia And Temperatures Can Get To 40 Celcius.
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Old 02-14-2012, 08:19 AM
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Check air flow at idle. Use a piece of ribbon and hold it in front of the rad and see if the ribbon is drawn towards the rad. 180 down the autobahn and heating up in the burbs sounds quite good. You could look into using a water pump with a bigger prop in it. A/C types had them. Or a smaller pulley to speed yours up.
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Old 02-14-2012, 09:05 AM
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Air in, air out. Runnin' fine at freeway speeds tells me that the radiator is adequately sized for the job. Heating at lower speeds tells me that air is not being pulled through the radiator in sufficient quantity or that there is insufficient area for the air to escape once it has been drawn in. Suggest that you totally seal the shroud to the radiator as a first effort. If the motor continues to heat at slower speeds, try spacing the rear of the hood up off the cowl by an inch or so. Just use wood blocks and longer bolts. This will increase the area all around the hood where air can get out. If that works for you, then you know you must either leave the hood spaced up a little or get to work finding other ways to duct the air out of the engine compartment.

I like to place the fan halfway in and halfway out of the shroud hole and leave just enough space around the fan tips so that the blades will not clip the shroud when the motor torques over on its mounts.

Also check the pitch of the fan blades. Lay the fan down on the bench and measure from the tallest part of the blade down to the bench surface. I like to use at least a 2 1/2" pitch and have used a GM diesel fan blade having a 3" pitch before. The motor will not need a fan over 35 mph, so make sure the fan clutch works properly. I like to use a thermostatically-controlled fan clutch with a factory steel fan.
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Old 04-30-2012, 04:53 PM
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Fan Blade

Hi,

So what is this fan blade with a 3" pitch used on?

Thanks, boway
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