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RalphWiggam
Samba Member
Joined: February 02, 2018
Posts: 906
Location: SouthEast
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 Posted: Tue Sep 15, 2020 4:39 am Post subject: Re: varying TIV fans |
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As soon as I get my bus back from the damn painter, I should have something interesting for you folks.
In fact I have it sitting here waiting to install, but I have no bus!! |
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metahacker
Samba Member
Joined: May 26, 2010
Posts: 692
Location: san.diego
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| Posted: Tue Sep 15, 2020 1:32 pm Post subject: Re: varying TIV fans |
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| airschooled wrote: |
| metahacker wrote: |
I believe it. We "knife edged" a couple T1 fans (grinding the flat entry point on each fin to a sharp edge to cut down on turbulence)...and I can say that tiny change made a very NOTICEABLE difference in sound. |
Now this I can get behind! Can you describe the difference? Did you monitor head or oil temperatures after? |
It was quieter  I did not collect any data before/after. One could assume that it would flow better and take less power.
It was part of a conversion on a non-stock motor from the terrible modified stock carburetor + clapped out SVDA combo it was running to a full EFI system with a wide-band O2 sensor hall sensor etc. It definitely ran WAY cooler after But that would be because I tuned AFR's on a dyno for several hours....
I would definitely not hesitate to do it again on any T1, though. A T4 cast fan I'm not so sure really needs it (seems less blunt on the edge with the casting process)? |
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SGKent 
Samba Member
Joined: October 30, 2007
Posts: 41031
Location: Citrus Heights CA (Near Sacramento)
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| Posted: Tue Sep 15, 2020 2:45 pm Post subject: Re: varying TIV fans |
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Each fan vane is an airfoil. Sharpening the air foil doesn't necessarily make it work better. Each vane makes the air move the same as a wing does, by pressure differences between the long and short side of the vane. Speed, flow, proximity to nearby vanes, all these things would effect how the fan works.
_________________
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Last edited by SGKent on Tue Sep 15, 2020 2:52 pm; edited 1 time in total |
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raygreenwood
Samba Member
Joined: November 24, 2008
Posts: 21507
Location: Oklahoma City
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| Posted: Tue Sep 15, 2020 2:49 pm Post subject: Re: varying TIV fans |
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| metahacker wrote: |
| airschooled wrote: |
| metahacker wrote: |
I believe it. We "knife edged" a couple T1 fans (grinding the flat entry point on each fin to a sharp edge to cut down on turbulence)...and I can say that tiny change made a very NOTICEABLE difference in sound. |
Now this I can get behind! Can you describe the difference? Did you monitor head or oil temperatures after? |
It was quieter I did not collect any data before/after. One could assume that it would flow better and take less power.
It was part of a conversion on a non-stock motor from the terrible modified stock carburetor + clapped out SVDA combo it was running to a full EFI system with a wide-band O2 sensor hall sensor etc. It definitely ran WAY cooler after But that would be because I tuned AFR's on a dyno for several hours....
I would definitely not hesitate to do it again on any T1, though. A T4 cast fan I'm not so sure really needs it (seems less blunt on the edge with the casting process)? |
Type 1 fan is a different type of airfoil than type 4. But you never know. Ray |
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