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The radiator fan blades stick out of the shroud by an inch or so by design. Is there a particular reason for this? Would air pull increase by extending he shroud? Just an idea....
Last edited by alexandervdr; 06-24-2018 at 06:38 PM.
The radiator fan blades stick out of the shroud by an inch or so by design. Is there a particular reason for this? Would air pull increase by extending he shroud? Just an idea....
If GM spent the time and $$ to put it on the factory AC cars, you can bet it will improve the air flow and cooling.
Larry
that makes sense. Next question: I assume the 67 extensions do not fit my 64 shroud? (although it does have what seems to be screw holes in it, and it's brand new...)
that makes sense. Next question: I assume the 67 extensions do not fit my 64 shroud? (although it does have what seems to be screw holes in it, and it's brand new...)
DR REBUILD at one time sold a kit to add a rubberized extension to the earlier AC cars. Not certain if the factory did this or not for early AC cars (probably did) but he offered one. I helped one of the CF members on how to buy and install it a few years back. So it will be in the archives. I want to say his CF name was CAPEVETTES, or similar. The DR part number was/is 1274201. Requires attachment with staples, which are available #1274014.
If you are looking for more airflow through your radiator, have you gone to the 7-blade fan made for the '64-'65 A/C cars? Another alternative would be the '66-'67 fan for A/C cars, which had only 5 blades but a steeper pitch angle.
DR REBUILD at one time sold a kit to add a rubberized extension to the earlier AC cars. Not certain if the factory did this or not for early AC cars (probably did) but he offered one. I helped one of the CF members on how to buy and install it a few years back. So it will be in the archives. I want to say his CF name was CAPEVETTES, or similar. The DR part number was/is 1274201. Requires attachment with staples, which are available #1274014.
If you are looking for more airflow through your radiator, have you gone to the 7-blade fan made for the '64-'65 A/C cars? Another alternative would be the '66-'67 fan for A/C cars, which had only 5 blades but a steeper pitch angle.
If you have your fan all the way in the shroud, you will get less cooling than half-in, half-out. Due to turbulence. There's a reason the engineers place the fans where they do (half in, half out) on pretty much every car and truck with a mechanical fan and a shroud. Whatever shroud you 'upgrade' to, be sure to have the fan half and half.
If you have your fan all the way in the shroud, you will get less cooling than half-in, half-out. Due to turbulence. There's a reason the engineers place the fans where they do (half in, half out) on pretty much every car and truck with a mechanical fan and a shroud. Whatever shroud you 'upgrade' to, be sure to have the fan half and half.
that's a point of view conflicting with previous posts Still, those extensions were part of the 66-67 AC, would be strange they were put on to make things worse
that's a point of view conflicting with previous posts Still, those extensions were part of the 66-67 AC, would be strange they were put on to make things worse
I think if you look at the fan placement, it will still be half and half even with the extensions. From all my experience in the auto industry over the years, installing a fan all the way in a shroud is a no-no. You can go online and google it, etc. It is counter-productive due to leaving nowhere for the turbulence to go....it tends to trap hot air in the shroud rather than pulling it all through the shroud. Sort of like water cavitation....
in aerodynamics, few things are 'obvious', hence sometimes very conflicting points of view. I happen to have spent zillions of hours researching small sized propellors and turbines. My findings were that a fan shroud COULD (and most of the time will) enhance flow, but only if the tips of the fan blades are close to the shroud. That is not the case in our cars. Blade tip turbulence spoils the party with increasing tip to shroud gap. That may indeed be one of the reasons why the blades are 1/2 or 1/4 out, the air on the tips is thrown out and by doing so streamlines the turbulence.
Nothing beats trying things out though, so when time allows I will mould a shroud extension and see what happens
Last edited by alexandervdr; 06-26-2018 at 06:25 AM.
!965 and earlier C2 cars have a different (metal) fan shroud. As such, the 66-67 lower shroud extension will not work for them. That is why I gave the OP aftermarket part numbers for a shroud extension that would work correctly on his car........although the extension is a rubber fabric and not fiberglass/plastic.
!965 and earlier C2 cars have a different (metal) fan shroud. As such, the 66-67 lower shroud extension will not work for them. That is why I gave the OP aftermarket part numbers for a shroud extension that would work correctly on his car........although the extension is a rubber fabric and not fiberglass/plastic.
Larry
I wondered about that. I am curious how much work it would be to adapt the extension to the earlier shroud. Just thinking out loud because I am headed down the A/C path on my 64.
06-24-2018, 06:25 PM
extra cooling radiator fan shroud?
Still, those extensions were part of the 66-67 AC, would be strange they were put on to make things worse
