Different fan blades for more air? (1 Viewer)

[donnerpassing]

Left is the green hub fan off my Hdj81, right is a blue hub for a later 80 series I picked up at a swap for cheap. green hub is still running nice, but the fan blades look much smaller and I wonder if the fan blades off the right later fan would push more air than those on the original left. I don’t have much time to change the viscous hub oil inside and the “blue hub mod”, but the blade swap I can do quickly while it’s out. Any input or experience!

 

[-Spike-]

View attachment 3328540

Left is the green hub fan off my Hdj81, right is a blue hub for a later 80 series I picked up at a swap for cheap. green hub is still running nice, but the fan blades look much smaller and I wonder if the fan blades off the right later fan would push more air than those on the original left. I don’t have much time to change the viscous hub oil inside and the “blue hub mod”, but the blade swap I can do quickly while it’s out. Any input or experience!

Any difference in pitch? Maybe the one for the diesel is designed to pull more air at lower RPM's?

 

[mudgudgeon]

Fresh silicone oil and an adjustment of the fan hub will be more beneficial than swapping blades.

It's actually not a huge job. If you're going to the effort to pull the original hub, apgrafev either it if the blue one. Both are adjustable if it's OEM

 

[donnerpassing]

Any difference in pitch? Maybe the one for the diesel is designed to pull more air at lower RPM's?

Doesn’t look like it, aside from blade length and width, the pitch looks about the same

 

[donnerpassing]

Fresh silicone oil and an adjustment of the fan hub will be more beneficial than swapping blades.

It's actually not a huge job. If you're going to the effort to pull the original hub, apgrafev either it if the blue one. Both are adjustable if it's OEM

If this weren’t my daily driver I’d be all over it and doing the fluid, but alas I’m up in the mountains and no hobby stores are nearby for the silicone. The nearest Toyota dealership is an hour away and they’d have to order the oil in for me

 

[donnerpassing]

Fresh silicone oil and an adjustment of the fan hub will be more beneficial than swapping blades.

It's actually not a huge job. If you're going to the effort to pull the original hub, apgrafev either it if the blue one. Both are adjustable if it's OEM

I do appreciate the input as always, thank you

 

[LandLocked93]

If the pitch is the same, physics dictates the greater surface area will move more air.

 

[mudgudgeon]

If this weren’t my daily driver I’d be all over it and doing the fluid, but alas I’m up in the mountains and no hobby stores are nearby for the silicone. The nearest Toyota dealership is an hour away and they’d have to order the oil in for me

Most people use a heavier oil than what Toyota offers.
Find an online supply and have it delivered?

 

[Gerry McGerry]

I run a 6 blade Mitsubishi fan on the 1HZ, different hub and totally different shape, size and pitch to the blades. Can't explain why it moves so much more air, but it does.

 

[Feistl]

I run a 6 blade Mitsubishi fan on the 1HZ, different hub and totally different shape, size and pitch to the blades. Can't explain why it moves so much more air, but it does.

Very interesting, got any pics or part numbers?

 

[mudgudgeon]

I run a 6 blade Mitsubishi fan on the 1HZ, different hub and totally different shape, size and pitch to the blades. Can't explain why it moves so much more air, but it does.

More than an oem Toyota fan with a hub that's been adjusted and filled with heavier silicone oil?

 

[Gerry McGerry]

More than an oem Toyota fan with a hub that's been adjusted and filled with heavier silicone oil?

More than an original fan with 400,000km on it, I know that much.

Very interesting, got any pics or part numbers?

Claimed to have a hub from a very well known manufacturer, but won't disclose who that is.