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gt1953
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Joined: May 08, 2002
Posts: 13846
Location: White Mountains Arizona
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k@rlos
Samba Member
Joined: October 04, 2012
Posts: 485
Location: Suffolk, England
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 Posted: Sun Jul 27, 2014 10:29 am Post subject: |
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| May have to make a simliar thing for my '70 bus. The 2110 can get a bit hot on motorway runs in the summer. |
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Brian
Samba Moderator
Joined: May 28, 2012
Posts: 8340
Location: Oceanside
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Glenn 
Mr. 010
Joined: December 25, 2001
Posts: 76897
Location: Sneaking up behind you
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gt1953
Samba Member
Joined: May 08, 2002
Posts: 13846
Location: White Mountains Arizona
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| Posted: Sun Jul 27, 2014 12:04 pm Post subject: |
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Glenn glad you responded. I did use the tennis ball for a while, then an empty soda can. Now this I made up for both cars. The Vintage Speed one is nice also. Mine was scrap aluminum and not permanent.
_________________
Volkswagen: We tune what we drive.
Numbers Matching VW's are getting harder to find. Source out the most Stock vehicle and keep that way. You will be glad you did.
72 type 1
72 Squareback
({59 Euro bug, 62, 63, 67, 68, 69, 73 type ones 68 & 69 type two, 68 Ghia all sold}) |
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Joel
Samba Member
Joined: September 04, 2006
Posts: 11099
Location: NSW Australia
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| Posted: Sun Jul 27, 2014 2:18 pm Post subject: |
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| k@rlos wrote: |
| May have to make a simliar thing for my '70 bus. The 2110 can get a bit hot on motorway runs in the summer. |
BAD idea with a bus, lots of cooked engines from people trying that.
more so with type 4s but still an issue with type 1s.
All it does is let all the hot air coming from underneath off the heads and muffler recirculate back into the fan.
if you really need extra air in the engine bay run some hose in through firewall tin and run it down to torsion bar tubes were it scoops in fresh air away from all the heat.
a friend had to to this in his early bug to get enough air to it.
made a big difference in temps
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1974 Germanlook 1303 2.5 Suba-Beetle |
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Eaallred
Samba Member
Joined: May 18, 2003
Posts: 5756
Location: West Valley City, Utah
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| Posted: Sun Jul 27, 2014 4:56 pm Post subject: |
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| Joel wrote: |
| k@rlos wrote: |
| May have to make a simliar thing for my '70 bus. The 2110 can get a bit hot on motorway runs in the summer. |
BAD idea with a bus, lots of cooked engines from people trying that.
more so with type 4s but still an issue with type 1s.
All it does is let all the hot air coming from underneath off the heads and muffler recirculate back into the fan. |
X2
As for adding more air into the engine bay, put a manometer in the engine bay and hit the highway. On a bay window bus you will actually create pressure in the engine bay because the bay window bus intakes are actually scooped and will in fact pressurize the engine bay. Adding more intakes may actually bleed off this pressure and reduce cooling.
On a split bus, adding more air as mentioned is a VERY good idea. A stock 1600 DP w/doghouse wants to consume more air than the stock louvers can provide. Provide enough extra intake into the engine bay (that wont recirculate) until your manometer shows zero vacuum going down the highway.
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Eric Allred
You have to remember something: Everybody pities the weak; Jealousy you have to earn. |
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Quokka42
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Joined: December 02, 2010
Posts: 3117
Location: Melbourne, Australia
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| Posted: Mon Jul 28, 2014 3:46 am Post subject: |
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Even on a Beetle propping open the rear tends to create vacuum. Propping open the front of the engine lid works because air is still flowing down over the top of the body. At the lower edge eddies are creating vacuum and it works in reverse.
Sorry.
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andy198712
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Joined: December 05, 2010
Posts: 1209
Location: Cornwall - UK
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| Posted: Mon Jul 28, 2014 2:41 pm Post subject: |
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Surely the pull of the engine and fan overcome that small vacuum easily though....?
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VWCOOL
Samba Member
Joined: June 02, 2006
Posts: 1821
Location: Down under
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| Posted: Mon Jul 28, 2014 4:00 pm Post subject: |
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| andy198712 wrote: |
| Surely the pull of the engine and fan overcome that small vacuum easily though....? |
yeah... just like you breathing through a scarf  |
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56Cabrio
Samba Member
Joined: May 22, 2008
Posts: 1899
Location: San Fernando Valley, CA
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| Posted: Mon Jul 28, 2014 4:22 pm Post subject: |
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| Quokka42 wrote: |
Even on a Beetle propping open the rear tends to create vacuum. Propping open the front of the engine lid works because air is still flowing down over the top of the body. At the lower edge eddies are creating vacuum and it works in reverse.
Sorry. |
So your saying this is a bad idea in a type 1 ?
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1956 Rag Top owned since 1988
1956 Convertible owned since 2000
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RIP Dad 4/20/1951 - 2/4/2023 |
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neil68
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Joined: March 17, 2007
Posts: 3440
Location: Calgary, Canada
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| Posted: Mon Jul 28, 2014 5:14 pm Post subject: Air intake |
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I also agree that propping open the bottom of the deck lid is a bad idea, under certain driving conditions, even in a Beetle. If you are stuck in "stop-and-go" traffic, the fan may end up sucking hot air from under the engine. That is why engine compartment seals are so important. Out on the open highway, a bottom propped lid can certainly improve air flow, but you need to be careful in the city.
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Der Kleiner Rennwagens
68 Beetle 2332 cc, 204 WHP
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Dynojet Test: https://www.youtube.com/watch?v=M9B_H3eklAo |
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rgdedge
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Joined: October 17, 2006
Posts: 862
Location: Seymour, TN
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| Posted: Mon Jul 28, 2014 7:47 pm Post subject: |
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I don't see the reason to prop a decklid open on the bottom if it has a convertible/vented one on it. If all the tins and seal are in place, wouldn't the hot air exiting from under the engine be drawn up into the engine compartment? There is a seal there for a reason.
Tim
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Joel
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Joined: September 04, 2006
Posts: 11099
Location: NSW Australia
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| Posted: Mon Jul 28, 2014 8:31 pm Post subject: Re: Air intake |
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| neil68 wrote: |
| I also agree that propping open the bottom of the deck lid is a bad idea, under certain driving conditions, even in a Beetle. If you are stuck in "stop-and-go" traffic, the fan may end up sucking hot air from under the engine. |
A guy on volkszone proved this with his bug only a few days ago.
propping the bottom opened helped at speed but when idling the temp was higher with it propped at the bottom than left closed
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Quick little bug, you got a Porsche motor in that?
1974 Germanlook 1303 2.5 Suba-Beetle |
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Brian
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Joined: May 28, 2012
Posts: 8340
Location: Oceanside
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| Posted: Mon Jul 28, 2014 8:41 pm Post subject: |
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Its kinda like the principal of the "66 air conditioning"
The air conditioning works best at 66 mph, and by air conditioning I mean open windows.
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udidwht
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Joined: March 06, 2005
Posts: 3779
Location: Seattle, WA./ HB, Ca./ Shizuoka, Japan
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| Posted: Tue Jul 29, 2014 12:51 am Post subject: |
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With regards to a bus...propping the lid or not has no effect on CHT's. This has been proving on several instances. Colin recently confirmed the same as well.
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1972 Westy Hardtop/Type-4 2056cc
96mm Biral AA P/C's~7.8:1CR
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71mm Stroke
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VWCOOL
Samba Member
Joined: June 02, 2006
Posts: 1821
Location: Down under
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| Posted: Tue Jul 29, 2014 1:25 am Post subject: |
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hot air rises, folks  |
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andy198712
Samba Member
Joined: December 05, 2010
Posts: 1209
Location: Cornwall - UK
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| Posted: Tue Jul 29, 2014 5:35 am Post subject: |
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And rain falls from the skies..... Get my drift?? Horses for courses
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| Alstrup wrote: |
| I like 5,5inchers in the rear at least. |
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Eaallred
Samba Member
Joined: May 18, 2003
Posts: 5756
Location: West Valley City, Utah
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| Posted: Tue Jul 29, 2014 6:02 am Post subject: |
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| udidwht wrote: |
| With regards to a bus...propping the lid or not has no effect on CHT'wouldn'tswget very far at all all allouldn't. This has been proving on several instances. Colin recently confirmed the same as well. |
Not the results I observed with my old buses (bay and splits) and their head temps. I wouldn't get very far at all before head temps were getting over 400 just driving around. I only measure head temps at the spark plug. I also measured ambient air temps in the engine bay with all my testing. A good sealed engine bay with enough intake to keep vacuum away would have ambient temp air going into the fan. Propping the bus lid open raised this temp significantly (again, never got very far before head temps were climbing and i pulled over).
On my 79 bay removing the panel inside the bus above the engine wouldn't make it run hotter on the streets, but head temps went higher on the highway.
These were my results anyway. This was ten years ago, so maybe air and physics has changed since then.
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Eric Allred
You have to remember something: Everybody pities the weak; Jealousy you have to earn. |
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gt1953
Samba Member
Joined: May 08, 2002
Posts: 13846
Location: White Mountains Arizona
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| Posted: Tue Jul 29, 2014 7:20 am Post subject: |
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Lucky for me I do not live where stop and go traffic exists.
_________________
Volkswagen: We tune what we drive.
Numbers Matching VW's are getting harder to find. Source out the most Stock vehicle and keep that way. You will be glad you did.
72 type 1
72 Squareback
({59 Euro bug, 62, 63, 67, 68, 69, 73 type ones 68 & 69 type two, 68 Ghia all sold}) |
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