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jpaull
Samba Member
Joined: February 22, 2005
Posts: 3641
Location: Paradise, Ca
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 Posted: Fri May 03, 2024 4:01 pm Post subject: Re: andrigs fan |
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Dave thats a pretty good point. The air resistance is a big part of the horsepower loss.
But having a choice of dropping 800 grams or keeping them, I would be excited to give that 2nd gen fan a try.
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txoval
Samba Member
Joined: January 23, 2004
Posts: 3839
Location: The Woodlands, TX
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| Posted: Fri May 03, 2024 4:46 pm Post subject: Re: andrigs fan |
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| If this fan draws in the air in with less resistance and is more efficient, it could push more air at less HP draw…but that’s above my mathematical knowledge |
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TXHCBeetle
Samba Member
Joined: October 07, 2021
Posts: 177
Location: Boerne, TX
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| Posted: Fri May 03, 2024 5:39 pm Post subject: Re: andrigs fan |
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| vwracerdave wrote: |
| TXHCBeetle wrote: |
| I'm interested in the rotating mass reduction, even if it flows the exact same |
The tiny bit lighter his fan will be compared to a stock dog house fans will not make any amount of noticeable difference. He is over stating the issue as a selling point to convince you it is a big deal. |
A belt driven fan takes power to move air: rotational mass + fan blade drag. While the blade drag will consume more power, you can't completey dismiss reduction in rotational mass. I'll take any gain..no matter how small
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Bruce
Samba Member
Joined: May 16, 2003
Posts: 17574
Location: Left coast, Canada
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| Posted: Sat May 04, 2024 3:46 am Post subject: Re: andrigs fan |
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| vwracerdave wrote: |
| It takes 10-11 HP to turn a stock dog house fan at highway speeds. |
More like 6000-7000 rpm as dyno testing has shown. The stock belt could never survive transmitting that much hp continuously.
| vwracerdave wrote: |
| A larger fan that pushes more air will take more HP to spin. |
Not necessarily. Every fan has a fan curve. This is the graph of the hp vs. CFM. It is possible to change to a different fan that can move more air requiring less hp. But we don't know if that applies because AFAIK, there has never been published fan curves of the stock fan, or the two andrigs fans.
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| overheard at the portland Swap Meet... wrote: |
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Bruce
Samba Member
Joined: May 16, 2003
Posts: 17574
Location: Left coast, Canada
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| Posted: Sat May 04, 2024 3:52 am Post subject: Re: andrigs fan |
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| TXHCBeetle wrote: |
| vwracerdave wrote: |
| TXHCBeetle wrote: |
| I'm interested in the rotating mass reduction, even if it flows the exact same |
The tiny bit lighter his fan will be compared to a stock dog house fans will not make any amount of noticeable difference. He is over stating the issue as a selling point to convince you it is a big deal. |
A belt driven fan takes power to move air: rotational mass + fan blade drag. While the blade drag will consume more power, you can't completey dismiss reduction in rotational mass. I'll take any gain..no matter how small |
The rotational inertia of the fan is only a factor when you're accelerating it. Once you're at cruising speed, its mass is irrelevant.
The mass of the fan will have zero effect on mileage. Since it's lighter, your engine should pick up revs a tiny bit quicker, similar to a lightened flywheel, but not as pronounced.
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| overheard at the portland Swap Meet... wrote: |
| ..... a steering wheel made from a mastadon tusk..... |
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TXHCBeetle
Samba Member
Joined: October 07, 2021
Posts: 177
Location: Boerne, TX
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| Posted: Sat May 04, 2024 11:30 am Post subject: Re: andrigs fan |
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Wait....are you saying that rotational mass is not a factor when you're parked too?.......no waaaaay....
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dubman67
Samba Member
Joined: April 10, 2003
Posts: 299
Location: Big Sky Country
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67rustavenger
Samba Member
Joined: February 24, 2015
Posts: 11036
Location: Oregon
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| Posted: Sat May 04, 2024 9:03 pm Post subject: Re: andrigs fan |
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| dubman67 wrote: |
| I cant get mine to not rub. Stock everything. |
Is yours a Gen I or Gen II fan?
My Gen I rubbed a little. When I first tried it. The rubbing caused the fan material to melt a little. I trimmed the lightly melted bit away and remounted the fan on the gen.
You need to check that the fan has equal spacing all the way around the gen backing plate. Mine was a little off on the spacing. I made a minor adjustment to the fan and gen backing plate spacing. No more rubbing.
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dubman67
Samba Member
Joined: April 10, 2003
Posts: 299
Location: Big Sky Country
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| Posted: Sun May 05, 2024 7:14 am Post subject: Re: andrigs fan |
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| 67rustavenger wrote: |
| dubman67 wrote: |
| I cant get mine to not rub. Stock everything. |
Is yours a Gen I or Gen II fan?
My Gen I rubbed a little. When I first tried it. The rubbing caused the fan material to melt a little. I trimmed the lightly melted bit away and remounted the fan on the gen.
You need to check that the fan has equal spacing all the way around the gen backing plate. Mine was a little off on the spacing. I made a minor adjustment to the fan and gen backing plate spacing. No more rubbing. |
Gen 2. Rubs on the inlet side of the shroud. I thought about shaving the spacer on the alternator shaft a bit, but ran out time and had to get the engine back in (bus). Next time the engine comes out I'll mess with it more.
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Fern_b57
Samba Member
Joined: November 05, 2023
Posts: 28
Location: Los Angeles
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| Posted: Tue Aug 13, 2024 6:04 am Post subject: Re: andrigs fan |
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will the stock doghouse fan work on his evolution fan shroud?
can't seem to find pics of the rear of the shroud, thank you |
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94touring
Samba Member
Joined: October 24, 2020
Posts: 481
Location: Tulsa - OK
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| Posted: Tue Aug 13, 2024 8:21 am Post subject: Re: andrigs fan |
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| Fern_b57 wrote: |
will the stock doghouse fan work on his evolution fan shroud?
can't seem to find pics of the rear of the shroud, thank you |
Yes. |
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Fern_b57
Samba Member
Joined: November 05, 2023
Posts: 28
Location: Los Angeles
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| Posted: Fri Aug 16, 2024 3:49 am Post subject: Re: andrigs fan |
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| 94touring wrote: |
| Fern_b57 wrote: |
will the stock doghouse fan work on his evolution fan shroud?
can't seem to find pics of the rear of the shroud, thank you |
Yes. |
awesome, is the evolution shroud same as scat , far as size. I know they are hand built so curious if they don't look wierd?
can you mount the venturi ring onto the evolution shroud?
can seem to fin pics of installed in vws.thanks |
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94touring
Samba Member
Joined: October 24, 2020
Posts: 481
Location: Tulsa - OK
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| Posted: Fri Aug 16, 2024 6:12 am Post subject: Re: andrigs fan |
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| Fern_b57 wrote: |
| 94touring wrote: |
| Fern_b57 wrote: |
will the stock doghouse fan work on his evolution fan shroud?
can't seem to find pics of the rear of the shroud, thank you |
Yes. |
awesome, is the evolution shroud same as scat , far as size. I know they are hand built so curious if they don't look wierd?
can you mount the venturi ring onto the evolution shroud?
can seem to fin pics of installed in vws.thanks |
The shroud is roughly the same dimensions, though you may need to loosen tins to get it to slide in. It didn't just drop in for me. The fan opening is considerably larger so a regular velocity ring won't work. I believe Andrig is making a ring for it. I made my own by welding a sheet metal ring around it, making slices, bending the tabs over, and then fiberglassed to fill in the slices. It turned into a 2 inch tall velocity stack. |
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Fern_b57
Samba Member
Joined: November 05, 2023
Posts: 28
Location: Los Angeles
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| Posted: Fri Aug 16, 2024 3:58 pm Post subject: Re: andrigs fan |
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| 94touring wrote: |
| Fern_b57 wrote: |
| 94touring wrote: |
| Fern_b57 wrote: |
will the stock doghouse fan work on his evolution fan shroud?
can't seem to find pics of the rear of the shroud, thank you |
Yes. |
awesome, is the evolution shroud same as scat , far as size. I know they are hand built so curious if they don't look wierd?
can you mount the venturi ring onto the evolution shroud?
can seem to fin pics of installed in vws.thanks |
The shroud is roughly the same dimensions, though you may need to loosen tins to get it to slide in. It didn't just drop in for me. The fan opening is considerably larger so a regular velocity ring won't work. I believe Andrig is making a ring for it. I made my own by welding a sheet metal ring around it, making slices, bending the tabs over, and then fiberglassed to fill in the slices. It turned into a 2 inch tall velocity stack. |
thank you for responding |
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David Raistrick
Samba Member
Joined: January 26, 2004
Posts: 632
Location: Geneva, Florida
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| Posted: Sun Oct 27, 2024 1:11 pm Post subject: Re: andrigs fan |
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since this is the definitive thread..... anyone have a gen1 fan they want to sell? 
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Dake
Samba Member
Joined: September 02, 2014
Posts: 483
Location: Georgia
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| Posted: Tue Dec 10, 2024 5:32 pm Post subject: Re: andrigs fan |
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Back for sale in the classifieds!
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ps2375
Samba Member
Joined: April 24, 2014
Posts: 2520
Location: Meridian,ID
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| Posted: Tue Dec 10, 2024 5:49 pm Post subject: Re: andrigs fan |
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Got one ordered for the race car! This will go nicely with the 10# FW and the 51/2" crank pulley.  |
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cmaxcliff
Samba Member
Joined: November 07, 2009
Posts: 194
Location: S.E. PA
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| Posted: Tue Dec 10, 2024 6:18 pm Post subject: Re: andrigs fan |
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| Too bad he hasn't figured out how to make the dual inlet design work. Very clever. There must be a way to get that done in another material but maybe the tooling cost etc. is too much of a barrier. |
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BFB
Samba Member
Joined: November 03, 2014
Posts: 2637
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| Posted: Tue Dec 10, 2024 7:50 pm Post subject: Re: andrigs fan |
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I really like the look of the evolution one’s, i ordered 2
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vamram 
Samba Member
Joined: March 08, 2012
Posts: 7996
Location: NOVA
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| Posted: Tue Jan 14, 2025 10:44 am Post subject: Re: andrigs fan |
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Bump. Just curious if there are any new real-world results w/this.
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