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PDXWesty Samba Member
Joined: April 11, 2006 Posts: 6235 Location: Portland OR
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Posted: Mon Dec 01, 2014 6:21 pm Post subject: |
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The Machinist wrote: |
I always assumed the chamber was a sort of buffer to smooth the fuel flow and keep constant pressure. Otherwise the fuel rail seems superfluous. Why not just run the lines directly? I have read that hot-rodded 914s starve for fuel because the chamber is too small on the stock fuel rails. |
The larger diameter header is just standard practice for piping design. It reduces stress at the joint between the branch line and header. If both were the same diameter or close, it would be more prone to cracking at the joint. The header should be 2-3 times the diameter of the branch. It has more to do with the physical properties of the material rather than flow. _________________ 89 Westy 2.1 Auto |
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Snort Samba Member
Joined: April 02, 2005 Posts: 1957 Location: Seattle, WA
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Posted: Mon Dec 01, 2014 6:51 pm Post subject: |
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^
Glad to see we are on the same page. Piping designers united, all stress issues please sit down. |
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Mellow Yellow 74 Samba Member
Joined: October 14, 2014 Posts: 1615 Location: Sydney, Australia
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Posted: Mon Dec 01, 2014 8:20 pm Post subject: |
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I just bought a pair of the GoWesty ones on sale. The Van Cafe ones look great and will definitely not leak but the GoWesty ones look fine too plus the spacing of the hoses look like they will line up with the injectors better than the original ones. The spacing on the type 4 ones look completely wrong to me. _________________ 1962 Karmann Ghia
1974 Deluxe Microbus
1985 Caravelle (Vanagon) |
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The Machinist Samba Member
Joined: November 16, 2009 Posts: 42 Location: Santa Cruz
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Posted: Tue Dec 02, 2014 12:14 am Post subject: |
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PDXWesty wrote: |
The larger diameter header is just standard practice for piping design. It reduces stress at the joint between the branch line and header. If both were the same diameter or close, it would be more prone to cracking at the joint. The header should be 2-3 times the diameter of the branch. It has more to do with the physical properties of the material rather than flow. |
Interesting. Makes sense. |
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tjet Samba Member
Joined: June 10, 2014 Posts: 3528 Location: CA & NM
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Posted: Tue Dec 02, 2014 2:37 am Post subject: |
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I though about getting metal ones, but my gas tank is plastic too.
I don't want my gas tank to worry that it will be next |
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insyncro Banned
Joined: March 07, 2002 Posts: 15086 Location: New York
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Posted: Tue Dec 02, 2014 5:23 am Post subject: |
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Getting rid of aged plastic parts is a very good idea...especially aged fuel system parts.
Change your...... |
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Merian Samba Member
Joined: January 04, 2014 Posts: 5212 Location: Orygun
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Posted: Tue Dec 02, 2014 3:13 pm Post subject: |
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why does the stock part have a flexy rubber diaphragm in one end? |
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The Machinist Samba Member
Joined: November 16, 2009 Posts: 42 Location: Santa Cruz
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Posted: Tue Dec 02, 2014 3:22 pm Post subject: |
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Merian wrote: |
why does the stock part have a flexy rubber diaphragm in one end? |
It is not what it seems.
From this thread: http://www.thesamba.com/vw/forum/viewtopic.php?t=397212&start=40
That circular piece on the end of the stock part is a plastic plug crimped on with a metal ring.
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djkeev Samba Moderator
Joined: September 30, 2007 Posts: 32432 Location: Reading Pennsylvania
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djkeev Samba Moderator
Joined: September 30, 2007 Posts: 32432 Location: Reading Pennsylvania
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insyncro Banned
Joined: March 07, 2002 Posts: 15086 Location: New York
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Posted: Sun Dec 07, 2014 3:52 pm Post subject: |
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GW's logos are usually stronger than the part it is on....and that is a pretty indestructible part.
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70coupyel Samba Member
Joined: September 06, 2006 Posts: 1657 Location: So.Cal
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Posted: Sun Dec 07, 2014 4:20 pm Post subject: |
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djkeev wrote: |
It is acid etched or sandblasted into the fuel rail! |
That part was anodized then laser engraved.
The blue DIY that 61scout listed before is a air manifold.
http://www.amazon.com/Interstate-Pneumatics-FPM44S-Aluminum-Rectangle/dp/B002RRRIOK
Just two extra plugs than the GW one.
When I saw those in the store fuel rail was my first though.
61scout did you get those blue fuel rails in? _________________
TheAndante wrote: |
Saying that specs are different than dimensions doesn't make sense. Porsche specs/VW specs/engineering specs are nothing but a series of dimensions,sizes,percentages,measurements, etc. |
http://www.thesamba.com/vw/forum/viewtopic.php?t=338946&highlight=
70 KG Coup
83 Westy Waterboxer |
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61Scout Samba Member
Joined: November 06, 2011 Posts: 1297 Location: Shoreline/Yakima WA
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adv rider Samba Member
Joined: September 09, 2012 Posts: 288 Location: Everett,wa
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Posted: Sun Dec 07, 2014 6:57 pm Post subject: |
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I think I will try these too, when I change my fuel lines out. Did you just put a brass plug in the unused end? Or a fuel pressure gauge? _________________ 86' Wolfsburg weekender 2.1, 4spd, , merian brown
Last edited by adv rider on Sun Dec 07, 2014 11:46 pm; edited 1 time in total |
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Merian Samba Member
Joined: January 04, 2014 Posts: 5212 Location: Orygun
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Posted: Sun Dec 07, 2014 6:59 pm Post subject: |
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Thx - that is a very interesting assembly. It does not look cheaper to manf. than some other way to seal the end.
So, why use a plastic plug crimped on with a metal ring and maybe a rubber seal in there also...?? |
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61Scout Samba Member
Joined: November 06, 2011 Posts: 1297 Location: Shoreline/Yakima WA
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Posted: Sun Dec 07, 2014 8:18 pm Post subject: |
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Quote: |
[quote="adv rider"]EDIT: Here's the link to the one I bought: http://www.amazon.com/gp/product/B00843USU2/ref=oh_aui_detailpage_o06_s00?ie=UTF8&psc=1
Despite the description of having 7 holes, the one I received only had six. Two on the long ends and the 4 holes along the one side. So there was no hole on the backside. Either way, easy enough to plug them up.
Kevin
I think I will try these to, when I change my fuel lines out. Did you just put a brass plug in the unused end? Or a fuel pressure gauge? |
Well, I just had plugs lying around from various projects, but they're cheap enough. I like hex plugs because they give a cleaner finish overall.
Here's some: http://www.ebay.com/itm/5-PCS-1-4-NPT-Brass-Intern...mp;vxp=mtr
Or if you want to go into the plug business: http://www.ebay.com/itm/Lot-of-50-1-4-Male-NPT-Rec...mp;vxp=mtr
On the one end you can see I added a pressure gauge. All the other extra holes on the rails are plugged. The gauge itself is installed with a 90* elbow and the gauge screws directly into the fitting for an all metal connection. I just wanted to have a permanent gauge set up to keep an eye on the fuel system a little easier. It's entirely unnecessary. The gauge does add a bit of weight also, so if you go that route be prepared to build a bracket of some sort to hold it up.
Oh, if you're asking if there needs to be a gauge on the other side the answer is no, it would be the same pressure anyway. Besides there's no room to see it on that side with the air cleaner in the way.
-Kevin _________________ 1986 Westfalia Weekender Wolfsburg, RJE 2.3
1985 Tin Top, Subie 2.2 + 5MT
Floppy Mirrors no more: http://www.thesamba.com/vw/forum/viewtopic.php?t=653018&highlight=
Remove the front spindle nut with ease: https://www.thesamba.com/vw/forum/viewtopic.php?t=679567&highlight=
Remove the rear wheel bearing housing without messing with the big 46mm nut: https://www.thesamba.com/vw/forum/viewtopic.php?t=679507&highlight=
-Nec Spe, Nec Metu |
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The Machinist Samba Member
Joined: November 16, 2009 Posts: 42 Location: Santa Cruz
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Posted: Mon Dec 08, 2014 4:04 pm Post subject: |
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I tried some cheaper plugs on ebay. Tested the first one and it leaked. Sent them all back. |
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raoul mitgong Samba Member
Joined: July 05, 2009 Posts: 1338 Location: Denver, CO
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Posted: Mon Dec 08, 2014 4:28 pm Post subject: |
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Hey 61scout, I like the gauge, makes trouble shooting things one step easier. Any worry about the it being the new weak point in your fuel system?
-d _________________ 84 Westy with a 2.1 (Groover)
86 Tintop Syncro (Crow)
86 Tintop Syncro to Westy project (Tom Servo)
91 Westy (Only the top 12 inches of this van (a burn victim)) |
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nacradriver Samba Member
Joined: January 15, 2009 Posts: 760 Location: Ventura, CA
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Posted: Mon Dec 08, 2014 4:40 pm Post subject: |
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djkeev wrote: |
Well in all honesty....... They did say "Minor Assembly Required"
Dave |
Some assembly! _________________ Güdrun -1989 Westfalia - 2013 - 2018
Petra - 1985 Vanagon - 1985 to 1991
Zisa - 1974 VW Van "Bus" - 1974 to 1985 |
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Merian Samba Member
Joined: January 04, 2014 Posts: 5212 Location: Orygun
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Posted: Mon Dec 08, 2014 6:23 pm Post subject: |
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Lots of $$ per unit materials cost.
And, this time there is little design or engineering work done. |
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