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spat12
Samba Member
Joined: June 24, 2015
Posts: 8
Location: Canaan, CT
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 Posted: Wed Nov 22, 2017 6:00 am Post subject: Engine shroud heater outlet dump |
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I’m sure this topic has been beaten to death, but quite frankly wasn’t able to find anything using search (maybe I’m not wording it correctly)
My 1970 std will not have heat in it, but would prefer not to modify the German tin to block off the outlets, and thing shrouds are hard to come by these days for a decent price. Also, there will be j tubes, not factory exhaust.
Are there any issues with just attaching hoses to the outlets and dumping the air out the rear? If this has been covered before, I’m sorry. |
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busman78
Samba Member
Joined: August 17, 2004
Posts: 4522
Location: Oklahoma City, OK
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| Posted: Wed Nov 22, 2017 6:45 am Post subject: Re: Engine shroud heater outlet dump |
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| You would be better off blocking the outlets on the fan shroud with 1-7/8" freeze plugs which fit internally, then do the hose, that way all the air goes to cooling the engine. |
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Glenn 
Mr. 010
Joined: December 25, 2001
Posts: 76912
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Floating VW
Samba Member
Joined: April 28, 2015
Posts: 1596
Location: The South Zone
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| Posted: Wed Nov 22, 2017 8:25 am Post subject: Re: Engine shroud heater outlet dump |
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| busman78 wrote: |
| You would be better off blocking the outlets on the fan shroud with 1-7/8" freeze plugs which fit internally, then do the hose, that way all the air goes to cooling the engine. |
Actually, there is some debate about this. Blocking off the outlets supposedly causes some nasty turbulence inside the fan shroud, which can even reduce cooling efficiency. I think Jack Raby did some testing on this and found that if you want to block off the outlets for aesthetic reasons, then you need to cut some 1-7/8" holes on the opposite side of the shroud to let the unwanted pressure out so the fan can cool the engine properly.
In that case, you might be better off doing like you planned with the original hoses. I see no downside.
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bnam
Samba Member
Joined: July 02, 2006
Posts: 2936
Location: El Dorado Hills CA/ Bangalore, India
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| Posted: Wed Nov 22, 2017 9:57 am Post subject: Re: Engine shroud heater outlet dump |
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| Floating VW wrote: |
| busman78 wrote: |
| You would be better off blocking the outlets on the fan shroud with 1-7/8" freeze plugs which fit internally, then do the hose, that way all the air goes to cooling the engine. |
Actually, there is some debate about this. Blocking off the outlets supposedly causes some nasty turbulence inside the fan shroud, which can even reduce cooling efficiency. I think Jack Raby did some testing on this and found that if you want to block off the outlets for aesthetic reasons, then you need to cut some 1-7/8" holes on the opposite side of the shroud to let the unwanted pressure out so the fan can cool the engine properly.
In that case, you might be better off doing like you planned with the original hoses. I see no downside. |
I don't get that. On stock cars the outlets are blocked off most of the time anyway -- unless you're using the heater. The flaps that block off the outlet just happen to be a bit further downstream.
Byas
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bluebus86
Banned
Joined: September 02, 2010
Posts: 11075
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| Posted: Wed Nov 22, 2017 10:03 am Post subject: Re: Engine shroud heater outlet dump |
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| bnam wrote: |
| Floating VW wrote: |
| busman78 wrote: |
| You would be better off blocking the outlets on the fan shroud with 1-7/8" freeze plugs which fit internally, then do the hose, that way all the air goes to cooling the engine. |
Actually, there is some debate about this. Blocking off the outlets supposedly causes some nasty turbulence inside the fan shroud, which can even reduce cooling efficiency. I think Jack Raby did some testing on this and found that if you want to block off the outlets for aesthetic reasons, then you need to cut some 1-7/8" holes on the opposite side of the shroud to let the unwanted pressure out so the fan can cool the engine properly.
In that case, you might be better off doing like you planned with the original hoses. I see no downside. |
I don't get that. On stock cars the outlets are blocked off most of the time anyway -- unless you're using the heater. The flaps that block off the outlet just happen to be a bit further downstream.
Byas |
No, the air flows even when heat is off, when heat is off, the heated air is dumped out of the heater box near the front. thus air always flows thru the flexible tubes when fan is turning.
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Brian
Samba Moderator
Joined: May 28, 2012
Posts: 8340
Location: Oceanside
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| Posted: Wed Nov 22, 2017 10:39 am Post subject: Re: Engine shroud heater outlet dump |
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I do not recommend type 4 oil coolers on type 1 engines. You can no longer use flaps and there's not much of a cooling advantage.
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vwkirb
Samba Member
Joined: January 16, 2007
Posts: 812
Location: Athens, GA
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| Posted: Wed Nov 22, 2017 4:49 pm Post subject: Re: Engine shroud heater outlet dump |
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| Floating VW wrote: |
| busman78 wrote: |
| You would be better off blocking the outlets on the fan shroud with 1-7/8" freeze plugs which fit internally, then do the hose, that way all the air goes to cooling the engine. |
Actually, there is some debate about this. Blocking off the outlets supposedly causes some nasty turbulence inside the fan shroud, which can even reduce cooling efficiency. I think Jack Raby did some testing on this and found that if you want to block off the outlets for aesthetic reasons, then you need to cut some 1-7/8" holes on the opposite side of the shroud to let the unwanted pressure out so the fan can cool the engine properly.
In that case, you might be better off doing like you planned with the original hoses. I see no downside. |
Forgot what the measurement is, but its not 1 7/8" you need a smaller hole to "fake" the resistance of a heater box.
I drilled the proper size hole into a freeze pug and hooked the hoses up like stock, and they dump to where the exhaust is.
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busman78
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Joined: August 17, 2004
Posts: 4522
Location: Oklahoma City, OK
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| Posted: Wed Nov 22, 2017 6:48 pm Post subject: Re: Engine shroud heater outlet dump |
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1-7/8" plugs the outlet, no screws required, steel or brass, I have never drilled a dump hole, just plugged the outlets.
Here is a picture of a pair I just removed from a fan housing, engine will be getting HE's so it will have quasi heat.
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glutamodo
The Android
Joined: July 13, 2004
Posts: 26315
Location: Douglas, WY
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| Posted: Wed Nov 22, 2017 7:15 pm Post subject: Re: Engine shroud heater outlet dump |
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| bluebus86 wrote: |
No, the air flows even when heat is off, when heat is off, the heated air is dumped out of the heater box near the front. thus air always flows thru the flexible tubes when fan is turning. |
Yep, it goes out here when the heat is off:
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neil68
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Joined: March 17, 2007
Posts: 3440
Location: Calgary, Canada
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| Posted: Wed Nov 22, 2017 11:29 pm Post subject: Re: Engine shroud heater outlet dump |
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| busman78 wrote: |
1-7/8" plugs the outlet, no screws required, steel or brass, I have never drilled a dump hole, just plugged the outlets.
Here is a picture of a pair I just removed from a fan housing, engine will be getting HE's so it will have quasi heat.
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This is what I've used for years with no issues. That internet myth about drilling dime-sized holes in the middle of these plugs (to simulate heat box dribble) is bunk. If you're not using heater boxes, then plug the shroud snorkles completely.
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Kauai/5
Samba Member
Joined: August 16, 2016
Posts: 76
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| Posted: Wed Nov 22, 2017 11:38 pm Post subject: Re: Engine shroud heater outlet dump |
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If you’re looking for a quick, cheap, clean way to cap off the outlets on the doghouse just use standard black ABS caps found at any hardware store with plumbing supplies. On my doghouse (late DP 1600) they were a perfect interference fit requiring just a tap or two of a rubber mallet.
On my doghouse 1.5” ABS caps were the right fit. I don’t know if they were the same diameter outlet for all years.
Last edited by Kauai/5 on Fri Nov 24, 2017 10:35 pm; edited 1 time in total |
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Glenn
Mr. 010
Joined: December 25, 2001
Posts: 76912
Location: Sneaking up behind you
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| Posted: Thu Nov 23, 2017 2:13 am Post subject: Re: Engine shroud heater outlet dump |
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Baby food jar lids.
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Glenn
74 Beetle Specs | 74 Beetle Restoration | 2180cc Engine
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Mikedrevguy
Samba Member
Joined: October 15, 2008
Posts: 2238
Location: Medford, OR
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| Posted: Sat Nov 25, 2017 8:38 am Post subject: Re: Engine shroud heater outlet dump |
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Reading description it’s unclear if the model w/o heater ducts has options for the thermostat. I could read it both ways.
Anyone have specific experience?
Edit: emailed supplier and I’ll reportback.
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mukluk
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Joined: October 18, 2012
Posts: 7023
Location: Clyde, TX
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| Posted: Sat Nov 25, 2017 9:26 am Post subject: Re: Engine shroud heater outlet dump |
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| Mikedrevguy wrote: |
Reading description it’s unclear if the model w/o heater ducts has options for the thermostat. I could read it both ways.
Anyone have specific experience?
Edit: emailed supplier and I’ll reportback. |
The description states about halfway through, "These shrouds are compatible with factory thermostat, a first for an aftermarket shroud."
Additionally, the picture of the non-heat shroud shown has holes for installing thermostat flaps.
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