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tinlizard Samba Member
Joined: June 28, 2010 Posts: 74 Location: Murfreesboro, TN
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Posted: Tue Jul 26, 2011 1:30 pm Post subject: SCAT linkage for dual 28 PCI's |
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Linkage has been tough to figure out for my setup, 2 28PCI carbs on homemade manifolds. I ordered the basic SCAT linkage as a start.
It's OK , but the carb links mount at the wrong angle. The slot is at 45 degrees, I need it parallel with the centerline.
Welded up the old slots and turned the link around so I could use my Chinese mill (file) to elongate and resize the link pin hole so it becomes the carb shaft slot. TaDaaa! Drill new pin holes in the weld area, bend a couple 45's for clearance, shorten the the link rods and associated heim joint screws(only about 3/8 inch), and there you have it...except the fat-head black cap screw still bumps the choke linkage, so off to the good hardware store for button-style cap screws, the silver ones.
So here's the result. Wasn't too hard, and I hope this helps someone else with a similar problem.
B'lieve me, rockin' a 36 horse means modify everything!
Last edited by tinlizard on Wed Jul 27, 2011 6:55 pm; edited 2 times in total |
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earthquake Samba Member
Joined: January 10, 2008 Posts: 3984 Location: SANDY VALLEY, NEVADA
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Posted: Thu Jul 28, 2011 11:15 am Post subject: |
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Looking good so far.
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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OvalDude54 Samba Member
Joined: July 15, 2005 Posts: 215 Location: SoCal- San Diego area (high rent)
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Posted: Thu Jul 28, 2011 9:27 pm Post subject: Dual 36hp build w/28PCIs |
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NICE build Dave! Awesome linkage work and manufactured manifolds! |
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Howard Sanson Samba Member
Joined: October 25, 2007 Posts: 68 Location: 15 and 91 frwy
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Posted: Fri Jul 29, 2011 2:10 am Post subject: Daul 28/s linkage |
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I dig this good job. |
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junior55 Samba Member
Joined: October 01, 2006 Posts: 941
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Posted: Tue Aug 02, 2011 4:11 pm Post subject: |
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No equalizer tubes ?.. I wonder how that will be ? |
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Snort Samba Member
Joined: April 02, 2005 Posts: 1957 Location: Seattle, WA
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Posted: Tue Aug 02, 2011 4:21 pm Post subject: |
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How did you fabricate your tapered intake tubes? |
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tinlizard Samba Member
Joined: June 28, 2010 Posts: 74 Location: Murfreesboro, TN
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Posted: Tue Aug 02, 2011 7:15 pm Post subject: |
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junior55 wrote: |
No equalizer tubes ?.. I wonder how that will be ? |
I hope it will be fine!
I discussed this with a couple of old hands that contribute to the Samba. Mark Harney is a local VW carb Guru (Mark), and Jim Shields out of Round Rock, TX (jshields). Both agree that if the carbs are properly synchronized, a balance tube is not needed. Also, I'll be using a centrifugal advance distributor from a 54-59 type 2, so I don't need a vacuum source.
Plus, Mark said he'd help me synch the carbs. |
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tinlizard Samba Member
Joined: June 28, 2010 Posts: 74 Location: Murfreesboro, TN
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Posted: Tue Aug 02, 2011 7:35 pm Post subject: |
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Snort wrote: |
How did you fabricate your tapered intake tubes? |
They may look tapered, but they're not. A local machinist freiend made them up for me. I cut up a couple of old stock manifolds to get the end plates, and the tubing is angle cut for the offset. Also we added about 3/8" of straight cut tubing to the top to get clearance for the carb bolts on the inside angle. You can see that section here:
I wanted them smooth inside for flow efficiency, and as large internally as practical, so I worked on them with carbide high-speed bits. I added Epoxy putty from POR to help smooth the cosmetics as well as a couple of inside angles.
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Snort Samba Member
Joined: April 02, 2005 Posts: 1957 Location: Seattle, WA
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Posted: Tue Aug 02, 2011 7:57 pm Post subject: |
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See, now I knew you had more photos and you were just being modest in your first post.
What size tubing did you use? |
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tinlizard Samba Member
Joined: June 28, 2010 Posts: 74 Location: Murfreesboro, TN
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Posted: Wed Aug 03, 2011 4:45 pm Post subject: |
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Snort wrote: |
What size tubing did you use? |
It's 1 3/8" OD, walls are about 1/8" |
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tinlizard Samba Member
Joined: June 28, 2010 Posts: 74 Location: Murfreesboro, TN
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Posted: Sat Jan 13, 2018 9:56 am Post subject: Re: SCAT linkage for dual 28 PCI's |
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Update, FWIW - I took these carbs off a couple of years ago and discovered that all of the putty on the interior of the manifolds was gone - inhaled by the engine, for sure. So skip that step if you're thinking of a manifold build! _________________ 68 Beetle Vert
70 Single Cab
79 Transporter |
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Rome Samba Member
Joined: June 02, 2004 Posts: 9603 Location: Pearl River, NY
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Posted: Sat Jan 13, 2018 9:33 pm Post subject: Re: SCAT linkage for dual 28 PCI's |
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tin, How did the engine run with the dual carbs? Did you make any other performance enhancements to it? |
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tinlizard Samba Member
Joined: June 28, 2010 Posts: 74 Location: Murfreesboro, TN
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Posted: Sun Jan 14, 2018 9:29 am Post subject: Re: SCAT linkage for dual 28 PCI's |
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Ran liked a raped ape - considering it started as a 36. Don't think you could tell it didn't have a 1500/1600. DPR 69mm stroked and balanced crank and assembly, slightly lightened flywheel, heads ported as much as I could stand, reground cam, straight-cut gears, heads flycut .100, compression around 8.5.
Ran great, but got even better when I switched to 12v. via a porsche generator.
Rejetted the Harney-built carbs just a touch, I forget the sizes.
When I upvolted, I also added an electric fuel pump, which was wonderful. Went thru 2 or 3 original pumps and never could get enough flow, and they leaked (oil) like hell. _________________ 68 Beetle Vert
70 Single Cab
79 Transporter |
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