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earthquake
Samba Member
Joined: January 10, 2008
Posts: 3984
Location: SANDY VALLEY, NEVADA
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 Posted: Fri Dec 15, 2017 5:50 pm Post subject: Single 40mm DCNF on Open Plenum manifold? |
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I want to try a single Weber 40mm DCNF on a open plenum manifold [with heat] I have, what size vents should I use. The carb I have has 24mm vents in it now, I think I have a set of 30mm's some where for a DCNF. this is a stock 1600 with a cheap header [w/J tubes] with a single muffler and a 009 or a 019.
Thanks for any help.
Casey
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95 Chevy C3500 dually
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borninabus
Samba R&D Dept.
Joined: May 18, 2006
Posts: 4539
Location: Arizona Highways
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| Posted: Fri Dec 15, 2017 7:34 pm Post subject: Re: Single 40mm DCNF on Open Plenum manifold? |
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find a zenith. it will fit the same manifold.
30mm vents are way huge for a 1600.
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earthquake
Samba Member
Joined: January 10, 2008
Posts: 3984
Location: SANDY VALLEY, NEVADA
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| Posted: Fri Dec 15, 2017 7:44 pm Post subject: Re: Single 40mm DCNF on Open Plenum manifold? |
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| borninabus wrote: |
find a zenith. it will fit the same manifold.
30mm vents are way huge for a 1600. |
I would love to try a Zenith but I don't have one and I have the DCNF, besides rebuild kits for DCNF's are bad enough. I was thinking about a single IDF but I don't have a manifold, and my disability check only goes so far.
Casey
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74 CLASS 11 LOOK-A-LIKE
69 DUNE BUGGY
79 INTERNATIONAL SCOUT II
05 SCION XB SERIES RELEASE 2[#437]
95 Chevy C3500 dually
98 Ford E150
Link to Kelly J. Nolte 3/20/53 - 11/6/08
https://time-zonelabs.blogspot.com/p/about-kelly.html
DEATH TO CHINGERS!
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fastfil
Samba Member
Joined: November 25, 2006
Posts: 356
Location: Sunshine Coast, AUS
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| Posted: Fri Dec 15, 2017 8:23 pm Post subject: Re: Single 40mm DCNF on Open Plenum manifold? |
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Use the smallest vents you have if you are using a plenum intake.
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Cusser
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Joined: October 02, 2006
Posts: 31380
Location: Hot Arizona
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| Posted: Sat Dec 16, 2017 8:13 am Post subject: Re: Single 40mm DCNF on Open Plenum manifold? |
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My own single Weber 40 DCNF is on an intake manifold that has two openings, not a plenum.
This is on my 1835cc DP engine, and has never been unbolted form that manifold since I bought the kit in 1976, works good; was purchased from CB Performance/Claude's Buggies.
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1970 VW (owned since 1972) and 1971 VW Convertible (owned since 1976), second owner of each. The '71 now has the 1835 engine, swapped from the '70. Second owner of each. 1988 Mazda B2200 truck, 1998 Frontier, 2014 Yukon, 2004 Frontier King Cab. All manual transmission except for the Yukon. http://www.thesamba.com/vw/forum/album_page.php?pic_id=335294 http://www.thesamba.com/vw/forum/album_page.php?pic_id=335297 |
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earthquake
Samba Member
Joined: January 10, 2008
Posts: 3984
Location: SANDY VALLEY, NEVADA
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| Posted: Sun Dec 17, 2017 7:00 pm Post subject: Re: Single 40mm DCNF on Open Plenum manifold? |
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| Cusser wrote: |
My own single Weber 40 DCNF is on an intake manifold that has two openings, not a plenum.
This is on my 1835cc DP engine, and has never been unbolted form that manifold since I bought the kit in 1976, works good; was purchased from CB Performance/Claude's Buggies. |
Cusser
any idea of what jets you have in your carb? might give me a starting place.
Casey
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74 CLASS 11 LOOK-A-LIKE
69 DUNE BUGGY
79 INTERNATIONAL SCOUT II
05 SCION XB SERIES RELEASE 2[#437]
95 Chevy C3500 dually
98 Ford E150
Link to Kelly J. Nolte 3/20/53 - 11/6/08
https://time-zonelabs.blogspot.com/p/about-kelly.html
DEATH TO CHINGERS!
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modok
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Cusser
Samba Member
Joined: October 02, 2006
Posts: 31380
Location: Hot Arizona
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| Posted: Mon Dec 18, 2017 10:30 am Post subject: Re: Single 40mm DCNF on Open Plenum manifold? |
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| earthquake wrote: |
| Cusser wrote: |
My own single Weber 40 DCNF is on an intake manifold that has two openings, not a plenum.
This is on my 1835cc DP engine, and has never been unbolted form that manifold since I bought the kit in 1976, works good; was purchased from CB Performance/Claude's Buggies. |
Cusser
any idea of what jets you have in your carb? might give me a starting place.
Casey |
My Weber 40DCNF has 135 main jets (0.135mm) and 50 idle jets (0.50mm) in it. Back in 1976 when I installed it it had 140 mains, and I know I experimented then with 40 and 60 idle jets, and I also seem to have a pair of 45 idle jets that I never bothered to try.
Except for changing that main jet 4 decades ago, I've never had the top off the carb (or removed the carb from the CB manifold); I did have to replace the accelerator pump on the side once due to leakage when it sat for a few years. So be prepared that you might need to get some different jets and check on smoothness and idle smoothness, and read the plugs to get an optimum mixture. Good luck !
I looked at the photos of the Weber manifolds in that link; mine has the two ports east-west (front-rear are for different Weber progressive carbs) and my manifold is dual port with one flexible tube/seal and does not have heat risers (but I'm also in Arizona desert).
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1970 VW (owned since 1972) and 1971 VW Convertible (owned since 1976), second owner of each. The '71 now has the 1835 engine, swapped from the '70. Second owner of each. 1988 Mazda B2200 truck, 1998 Frontier, 2014 Yukon, 2004 Frontier King Cab. All manual transmission except for the Yukon. http://www.thesamba.com/vw/forum/album_page.php?pic_id=335294 http://www.thesamba.com/vw/forum/album_page.php?pic_id=335297 |
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FreeBug
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Posts: 4278
Location: deepest, darkest Switzerland
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| Posted: Mon Dec 18, 2017 10:40 am Post subject: Re: Single 40mm DCNF on Open Plenum manifold? |
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| Cam choice will be crucial to how well it runs. |
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mark tucker
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| Posted: Mon Dec 18, 2017 11:34 am Post subject: Re: Single 40mm DCNF on Open Plenum manifold? |
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| just get the 2 port model for a duel port and a open spacer to give you a open plenum. that way you can test and see how much better it will run with the duel port.s |
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earthquake
Samba Member
Joined: January 10, 2008
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Location: SANDY VALLEY, NEVADA
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| Posted: Mon Dec 18, 2017 10:34 pm Post subject: Re: Single 40mm DCNF on Open Plenum manifold? |
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I have a IR manifold that has a slotted base pad for multi carbs, it also has two middle holes to mount 3 bolt carbs on it like Weber DCN's [which I have a set of], I have to look at it but I think the heat risers have been cut off of it.
I am trying to put together a complete Deano package, I have the center pull part of the linkage with the purple paint still on it, I am looking for a set of valve covers, air cleaners and crank pulley to build a vintage look motor for my dune buggy.
"I have lots of thing I want to do, But no money to do em!"
a new C&W song by Bucky Weinstein.
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74 CLASS 11 LOOK-A-LIKE
69 DUNE BUGGY
79 INTERNATIONAL SCOUT II
05 SCION XB SERIES RELEASE 2[#437]
95 Chevy C3500 dually
98 Ford E150
Link to Kelly J. Nolte 3/20/53 - 11/6/08
https://time-zonelabs.blogspot.com/p/about-kelly.html
DEATH TO CHINGERS!
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earthquake
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Posts: 3984
Location: SANDY VALLEY, NEVADA
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| Posted: Tue Dec 19, 2017 5:09 pm Post subject: Re: Single 40mm DCNF on Open Plenum manifold? |
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Here are the 2 manifolds I have...
The IR manifold would need some kind of ported spacer so the butterflies would open. It also looks like somebody ground the corner off to clear a alternator.
The OP manifold needs to have the heat risers installed and the ones I have are a bit loose, I think I can swage the ends open a bit to tighten them up.
Casey
_________________
74 CLASS 11 LOOK-A-LIKE
69 DUNE BUGGY
79 INTERNATIONAL SCOUT II
05 SCION XB SERIES RELEASE 2[#437]
95 Chevy C3500 dually
98 Ford E150
Link to Kelly J. Nolte 3/20/53 - 11/6/08
https://time-zonelabs.blogspot.com/p/about-kelly.html
DEATH TO CHINGERS!
[From a military recruitment poster in the novel "The Stainless Steel Rat" By Harry Harrison] |
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Multi69s
Samba Member
Joined: January 24, 2006
Posts: 5364
Location: Lefty, CA
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| Posted: Wed Dec 20, 2017 1:20 am Post subject: Re: Single 40mm DCNF on Open Plenum manifold? |
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Since this basically a stock engine, I would run the IR manifold. Using the plenum manifold would probably cause tuning/performance issues from hades. As far as the spacer, just get a piece of PVC, ABS, plexiglass the needed thickness. Drill and port as needed, put a gasket on each side and give it a try. The one thing about a stock engine, is that the jetting is not that critical when doing some experimenting.
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earthquake
Samba Member
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Posts: 3984
Location: SANDY VALLEY, NEVADA
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| Posted: Fri Dec 22, 2017 3:21 pm Post subject: Re: Single 40mm DCNF on Open Plenum manifold? |
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Well I made the adapter/spacer today only to find out the IR manifold corner slots don't fit but its nothing a little grinding wont fix.
I pulled down the carb only to find it needed shaft bearings so I have to wait until after the holidays to order a rebuild kit and a set of bearings.
Oh well, i am getting there.
Casey
_________________
74 CLASS 11 LOOK-A-LIKE
69 DUNE BUGGY
79 INTERNATIONAL SCOUT II
05 SCION XB SERIES RELEASE 2[#437]
95 Chevy C3500 dually
98 Ford E150
Link to Kelly J. Nolte 3/20/53 - 11/6/08
https://time-zonelabs.blogspot.com/p/about-kelly.html
DEATH TO CHINGERS!
[From a military recruitment poster in the novel "The Stainless Steel Rat" By Harry Harrison] |
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modok
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Location: Colorado Springs
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| Posted: Fri Dec 22, 2017 6:48 pm Post subject: Re: Single 40mm DCNF on Open Plenum manifold? |
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| Good choice. With that "isolated" manifold I think 28-30mm vents will work |
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Multi69s
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