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aeromech
Samba Member
Joined: January 24, 2006
Posts: 16954
Location: San Diego, California
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 Posted: Thu Aug 10, 2017 10:09 am Post subject: 1971 Dog House Venturi Ring? |
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Guys,
I'm just finding out about this. Does anyone here use a venturi ring on their fan shroud? Awesome Powder Coat sells them for $50 so they're pretty cheap and they claim lower oil temps and CHT.
http://www.awesomepowdercoat.com/Venturi_Ring.html
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busdaddy
Samba Member
Joined: February 12, 2004
Posts: 51112
Location: Surrey B.C. Canada, but thinking of Ukraine
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| Posted: Thu Aug 10, 2017 10:18 am Post subject: Re: 1971 Dog House Venturi Ring? |
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I'm running one, oil temps do seem lower, but I didn't do any scientific testing to confirm that and I also dealt with a few other things at the time of install that could have played a part.
But why not?, can't make it worse. VW thought the FI beetle needed one, and the locations where it mounts are pressed into all DH shrouds so it must have been something they were toying with for a long time.
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aeromech
Samba Member
Joined: January 24, 2006
Posts: 16954
Location: San Diego, California
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| Posted: Thu Aug 10, 2017 10:20 am Post subject: Re: 1971 Dog House Venturi Ring? |
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How did you attach it to the shroud Mark?
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busdaddy
Samba Member
Joined: February 12, 2004
Posts: 51112
Location: Surrey B.C. Canada, but thinking of Ukraine
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| Posted: Thu Aug 10, 2017 10:23 am Post subject: Re: 1971 Dog House Venturi Ring? |
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Pop rivets.
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aeromech
Samba Member
Joined: January 24, 2006
Posts: 16954
Location: San Diego, California
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| Posted: Thu Aug 10, 2017 10:36 am Post subject: Re: 1971 Dog House Venturi Ring? |
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I have a pretty nifty nutsert tool and a good supply of hardware. Do you think that would work or is it overkill?
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SGKent 
Samba Member
Joined: October 30, 2007
Posts: 41031
Location: Citrus Heights CA (Near Sacramento)
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| Posted: Thu Aug 10, 2017 10:57 am Post subject: Re: 1971 Dog House Venturi Ring? |
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I can't comment on whether it allows more cooling air other than I definitely saw a HP and RPM increase running an air horn when racing than just open air. The increase was not from lengthening the induction system but rather more air being drawn in. I would think it would reduce turbulence by allowing the air to turn 90 degrees better.
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busdaddy
Samba Member
Joined: February 12, 2004
Posts: 51112
Location: Surrey B.C. Canada, but thinking of Ukraine
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| Posted: Thu Aug 10, 2017 11:09 am Post subject: Re: 1971 Dog House Venturi Ring? |
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| aeromech wrote: |
I have a pretty nifty nutsert tool and a good supply of hardware. Do you think that would work or is it overkill?
[pic] |
If you have it why not?, the holes on the aftermarket one look big, I drilled one off of an OG bug shroud and the tabs ended up with smaller holes, 1/8" SS pop rivets were on hand and fast, you can't see it once it's in place anyways.
I guess it works by smoothing out the airflow so more gets into the fan, I'll leave the fluid dynamics to the scientists. It seems to work for me, I haven't experienced any rediculous oil temperature moments on the highway since it went on, even with all the vent windows open.
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aeromech
Samba Member
Joined: January 24, 2006
Posts: 16954
Location: San Diego, California
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| Posted: Thu Aug 10, 2017 11:15 am Post subject: Re: 1971 Dog House Venturi Ring? |
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Well I just ordered one. $65 delivered. Hopefully the mounting tabs will be strong enough.
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VW Type 2 1971 (3 ea.) 1978, 1969
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busdaddy
Samba Member
Joined: February 12, 2004
Posts: 51112
Location: Surrey B.C. Canada, but thinking of Ukraine
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| Posted: Thu Aug 10, 2017 11:20 am Post subject: Re: 1971 Dog House Venturi Ring? |
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Most of the tabs lay against the shroud, there's no movement once it's installed. They seem much longer than needed, likely to reach to a place where the spot welder could get at them.
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Please don't PM technical questions, ask your problem in public so everyone can play along. If you think it's too stupid post it here
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Tcash
Samba Member
Joined: July 20, 2011
Posts: 12844
Location: San Jose, California, USA
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Wildthings
Samba Member
Joined: March 13, 2005
Posts: 50332
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| Posted: Thu Aug 10, 2017 2:08 pm Post subject: Re: 1971 Dog House Venturi Ring? |
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I have one on my Thing engine, can't say if it improves matters or not, it just sounded like a good idea. I did later go out and buy a shroud for a later Beetle which had a factory ring, but have never needed to pull the engine since and thus the later shroud is still awaiting its day.
The one advantage I have heard for the ring is that it is much harder for the intake to be completely block by a piece of paper or plastic. Hopefully this is something I will never get to test. |
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skills@eurocarsplus
Samba Peckerhead
Joined: January 01, 2007
Posts: 16849
Location: sticksville, ct.
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| Posted: Thu Aug 10, 2017 2:25 pm Post subject: Re: 1971 Dog House Venturi Ring? |
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I did flow testing on one in my 71. it gained 2 kg/h at idle
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lightice
Samba Member
Joined: December 14, 2012
Posts: 599
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| Posted: Thu Aug 10, 2017 3:59 pm Post subject: Re: 1971 Dog House Venturi Ring? |
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I got this with a bunch of parts, the venturi ring came along with it and believed to have been like this from the factory. |
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Wasted youth
Samba Member
Joined: July 06, 2012
Posts: 5134
Location: California's Hot and Smoggy Central Valley
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| Posted: Thu Aug 10, 2017 4:15 pm Post subject: Re: 1971 Dog House Venturi Ring? |
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Hard on!  Nice score. |
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Wasted youth
Samba Member
Joined: July 06, 2012
Posts: 5134
Location: California's Hot and Smoggy Central Valley
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| Posted: Thu Aug 10, 2017 4:20 pm Post subject: Re: 1971 Dog House Venturi Ring? |
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| Wildthings wrote: |
| ...The one advantage I have heard for the ring is that it is much harder for the intake to be completely block by a piece of paper or plastic. Hopefully this is something I will never get to test. |
When I was 13 my older brother thought it would be super convenient to keep a stack of bi-fold paper towels in the engine compartment of our '69 bus.
That was not a good idea after all. |
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aeromech
Samba Member
Joined: January 24, 2006
Posts: 16954
Location: San Diego, California
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| Posted: Fri Aug 11, 2017 9:48 am Post subject: Re: 1971 Dog House Venturi Ring? |
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Here's an installation video
https://www.youtube.com/watch?v=wKfcrDv8vNc
Someone needs to make a screen for the DH shroud
_________________
Lead Mechanic: San Diego Air and Space Museum
Licensed Airframe and Powerplant Mechanic
Licensed Pilot (Single engine Land)
Boeing 727,737-200-300-400,757,767
Airbus A319,320,321
DC9/MD80
BAe146
Fokker F28/F100
VW type 1 1962,63,65,69,72
VW Type 2 1971 (3 ea.) 1978, 1969
VW Jetta
VW Passat
Capable of leaping tall buildings in a single bound |
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SGKent
Samba Member
Joined: October 30, 2007
Posts: 41031
Location: Citrus Heights CA (Near Sacramento)
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| Posted: Fri Aug 11, 2017 10:09 am Post subject: Re: 1971 Dog House Venturi Ring? |
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| Wasted youth wrote: |
| Wildthings wrote: |
| ...The one advantage I have heard for the ring is that it is much harder for the intake to be completely block by a piece of paper or plastic. Hopefully this is something I will never get to test. |
When I was 13 my older brother thought it would be super convenient to keep a stack of bi-fold paper towels in the engine compartment of our '69 bus.
That was not a good idea after all. |
cool, add rain and you have a Paper Mache' generating machine.
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Tcash
Samba Member
Joined: July 20, 2011
Posts: 12844
Location: San Jose, California, USA
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| Posted: Fri Aug 11, 2017 11:23 am Post subject: Re: 1971 Dog House Venturi Ring? |
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When you drill the hole toward the oil cooler, put a collar stop on the drill bit or you may poke a hole in your oil cooler.
Tcash |
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aeromech
Samba Member
Joined: January 24, 2006
Posts: 16954
Location: San Diego, California
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| Posted: Fri Aug 11, 2017 11:27 am Post subject: Re: 1971 Dog House Venturi Ring? |
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| Tcash wrote: |
When you drill the hole toward the oil cooler, put a collar stop on the drill bit or you may poke a hole in your oil cooler.
Tcash |
Yeah,
I noticed the guy in the video drove his bit in so far that it might hit a cooler if it was there. When I do mine, the tin will be swapped from my current long block to my new 1800. Sometime next month or so.
_________________
Lead Mechanic: San Diego Air and Space Museum
Licensed Airframe and Powerplant Mechanic
Licensed Pilot (Single engine Land)
Boeing 727,737-200-300-400,757,767
Airbus A319,320,321
DC9/MD80
BAe146
Fokker F28/F100
VW type 1 1962,63,65,69,72
VW Type 2 1971 (3 ea.) 1978, 1969
VW Jetta
VW Passat
Capable of leaping tall buildings in a single bound |
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hazetguy
Samba Member
Joined: April 06, 2001
Posts: 10773
Location: iT StiNgeD iTseLf tO dEAd
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| Posted: Fri Aug 11, 2017 1:32 pm Post subject: Re: 1971 Dog House Venturi Ring? |
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| lightice wrote: |
| I got this with a bunch of parts, the venturi ring came along with it and believed to have been like this from the factory. |
fuel injected beetle fan shroud. yes, they came like that from the factory.
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