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TR4/4A TR4A plastic fan options

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The yellow fan bolts right up!

fan-clearance.JPG
 
Aloha,

I don't have a TR4 but in my TR3A i use a polymer fan from NAPA. It is a black six blade fan with flexi-blades that are suppose to loose pitch due to centrifugal force at higher RPM. It required some modification to mount. I needed to reduce the overall diameter from 14 inches to 13 inches for clearance. I used an Xacto saw for this. I also needed to fabricate a spacer about 3/8 inches thick to move the fan forward to clear the cross tube. I used an old nylon cutting board to make the spacer. The original fan mounting hardware was used to attach the fan and spacer to the fan hub extension. The fan works very well at low RPM and in stop and go traffic keeping the car cool. Here is a photo of it installed.
 

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I used a yellow fan with spacers on a tr3 and it worked well. I do wish I would have thought of using the nylon spacer idea that looks like it would hold at high rpm and still be easy to tool out the center. Nice job Dave. At one point, I thought I was going to use a tr4 hub and a yellow fan and try and stick that on the tr3 because the longer tr4 hub let the fan clear the brace and I would not have to use adapters (washers). However, that put the fan close to radiator, and it looked like I would have to slide the radiator forward by slotting the mounting holes. In the end, I went with the yellow fan on washers for the tr3 because I felt like I had some control over the gap by using washers as spacers. Having said all that a tr4 has different clearances, so I am not sure exactly what I would do there, perhaps one of those larger flex fans.
Steve
 
TR4A_IRS said:
Any idea why the blades are asymetrically spaced?
Click to expand...
It's supposed to make less noise that way.
 
If you look closely, you will see that the blades do have symmetry, but they skip a blade then repeat the pattern, one big Y then another big Y after the skip. I was in high school in the sixties and early seventies.
Steve
 
sp53 said:
If you look closely, you will see that the blades do have symmetry, but they skip a blade then repeat the pattern, one big Y then another big Y after the skip. I was in high school in the sixties and early seventies.
Steve
Click to expand...

Yeah, but you have to be standing on your head to see it. I never see the sailboat either.
 
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