home register FAQ memberlist calendar

Go Back   Turbobricks Forums > Mechanical > performance & modifications

View Poll Results: What carburetor?
Rebuild 32/36 DGEV 0 0%
Convert back to dual SUs 7 87.50%
Try a Weber 38 DGAS synchronous carb 1 12.50%
Voters: 8. You may not vote on this poll

Reply
 
Thread Tools Display Modes
Old 08-01-2020, 10:56 AM   #1
spock345
Board Member
 
spock345's Avatar
 
Join Date: Nov 2016
Location: Santa Cruz, CA
Default B18 carburetor options

The 122 I have been working on was swapped to a Weber 32/36 DGEV sometime in the late 90's/early 2000's. The issue is that this carburetor is tired. Most of the diaphragms are blown out, and the main throttle spring is tired.

I have decided that it is time to entertain other fuel delivery options while I have the engine bay taken apart. I could try rebuilding the DGEV, convert it back to twin SU's, or try a 38 DGES (synchronous instead of progressive). The DGES has me intrigued because it seems more similar to the dual SU setup the car originally had but I wouldn't have to go source two SU carbs, a linkage, and a manifold to make it work.

In the end my plans for the motor are just going to be a new exhaust (I have the later dual port manifold) and a D cam. Maybe bump the compression up to B18B spec if I ever take the head off.
__________________
1967 122s, B18-D, M40
1989 240 B230F (V15 cam, chipped EZK), M47 (Lost a fight with a Chevy express van)
2012 VW Tiguan 6 speed auto

Last edited by spock345; 08-01-2020 at 11:07 AM..
spock345 is offline   Reply With Quote
Old 08-01-2020, 11:17 AM   #2
mitch1971
Board Member
 
Join Date: Sep 2009
Location: Aberdeen, Scotland
Default

For that setup personally I’d go the dual SUs rather than the single Weber. Dual 40 DCOEs with 33 chokes (I’m not familiar with Weber’s) is an option and flow better than the SUs but more expensive and use more fuel. SUs are a very simple carb and selecting the correct needle will be straight forward.

Other options; dual 175 CD strombergs, Mikunis or possibly 4 Yamaha R1 carbs.
mitch1971 is offline   Reply With Quote
Old 08-01-2020, 09:19 PM   #3
fatcatbestcat
Professional Hack
 
fatcatbestcat's Avatar
 
Join Date: Oct 2019
Location: Toronto, ON (Canada)
Default

If you're feeling adventurous, you can get a carb adapter for a jag straight-six, and run two DGEV/DGES carbs on an old SU manifold. Someone else on here did that, but I seriously can't remember who.
__________________
Doing the wrong thing the right way.

Quote:
Originally Posted by redblockpowered View Post
Will you do $14.99 shipped?
Quote:
Originally Posted by IansPlatinum View Post
please no more prying things with screwdrivers and bashing things with hammers!
fatcatbestcat is offline   Reply With Quote
Old 08-02-2020, 11:45 AM   #4
spock345
Board Member
 
spock345's Avatar
 
Join Date: Nov 2016
Location: Santa Cruz, CA
Default

Quote:
Originally Posted by mitch1971 View Post
For that setup personally I’d go the dual SUs rather than the single Weber. Dual 40 DCOEs with 33 chokes (I’m not familiar with Weber’s) is an option and flow better than the SUs but more expensive and use more fuel. SUs are a very simple carb and selecting the correct needle will be straight forward.

Other options; dual 175 CD strombergs, Mikunis or possibly 4 Yamaha R1 carbs.
Dual SU's would make things easier. Do Mikunis and strombergs mount to the SU manifold?

I haven't done any head or exhaust work yet so I doubt DCOEs would be of much benefit.
spock345 is offline   Reply With Quote
Old 08-02-2020, 01:25 PM   #5
classicswede
Volvo upgrades
 
Join Date: Sep 2005
Location: North Wales
Default

Quote:
Originally Posted by spock345 View Post
Do Mikunis and strombergs mount to the SU manifold?
yes they are the same bolt pattern for HS6 HIF44 CD175's and Mikunis of that pattern
__________________
http://www.classicswede.co.uk/

classicswede is offline   Reply With Quote
Old 08-03-2020, 10:35 AM   #6
MikeJr.
Gloss Boss
 
MikeJr.'s Avatar
 
Join Date: Oct 2003
Location: Acworth, GA 30102
Default

Honestly SU's are just about perfect for the stock-ish B18. There are a few companies that have rebuild services, and they're pricing isn't to bad.

I ran 45 DCOE's on my B18 and they were just to much. It runs much better on SU's. DCOE 40s would be better, but I doubt you'd see much improvement over the SU's
__________________
My other projects http://www.pbase.com/mikejr
MikeJr. is offline   Reply With Quote
Old 08-04-2020, 10:43 AM   #7
spock345
Board Member
 
spock345's Avatar
 
Join Date: Nov 2016
Location: Santa Cruz, CA
Default

I picked up a set of HS6 carburetors and a manifold from someone nearby. Throttle shafts will probably need work.

Is it possible to just send out the bodies to have the bushings replaced? I have the tools for most of the rebuild process. Just not the drill press and reaming tools needed to do the bushings right.

Compared to the weber the SUs seem to be the simplest thing on the planet. Not having to worry about getting the right size for half a dozen or more jets works for me.
spock345 is offline   Reply With Quote
Old 08-04-2020, 04:43 PM   #8
FrankBooth
Board Member
 
FrankBooth's Avatar
 
Join Date: Jul 2018
Location: SoCal
Default

I sent Joe Curto in NY mine for just a re-bush a year or two ago with good results.
www.joecurto.com - it looks like he's constructing a new website but his contact info's on there.
FrankBooth is offline   Reply With Quote
Old 08-04-2020, 05:07 PM   #9
hiperfauto
The Librarian
 
hiperfauto's Avatar
 
Join Date: Nov 2011
Location: So Cal
Default

We have JC rebuild the throttle bodies and assemble them ourselves with genuine SU repair kits. There are 5 different throttle bodies for B18's, 3 for 2 bolt air filters and 2 for 3 bolt air filters. The rear TB on 2 bolt TB's can have a vacuum nipple on the underside for distributor advance. We try to keep all 5 throttle bodies in stock because it usually takes a couple of weeks to get them done.

FYI, JC uses oversize throttle shafts and reams the original bushings to fit whenever possible.
hiperfauto is offline   Reply With Quote
Old 08-04-2020, 05:24 PM   #10
Kjets On a Plane
Board Member
 
Kjets On a Plane's Avatar
 
Join Date: Nov 2002
Location: Oregone
Default

SUs & Dual downpipe iron conjoined manifold (no double butterfly, doesn't crack like the aluminum B18 manifold can) is pretty no-fuss/works well for carbs/stock bolt-in stuff if you don't want to spend cubic money/accept your primitive outdated slower vintage car to cruise around in.
Individual paper filters or somewhat rare 140 SU airbox fits nice in the 122.
Bias is always OE quality / junkpile, so 140 airbox probably, even if the filter costs *some* money now.

Beyond that, most everything gets vastly more expensive/less durable for usable power etc.

There was a place that did seals/bearings for the SUs, but just harder bushings & proper repairs seem to work well.

Pretty good compromise for performance, economy & complexity of the day before they installed a zillion vacuum lines/contraptions onto carbs to *try* to get them to burn cleanly.

Would just install EFI (even with D-jet parts) if going beyond recombining the stock SU junk-pile, especially if sticking with a B18 & B18 head over an EFI-valve size B20.
Carbs are always a compromise, apart from lacking electronics.
But the EFI intake look and one extra fuse/few electronics don't offend/is reversible if original matters.
Really have to be committed to carbs beyond the SUs in a lot of ways, apart from the fuel tank being somewhat lacking for baffles/electric pumps in some cars for EFI
& pushrod volvos got EFI anyway.

No sub-standard non-OE quality DGVs please, those things are a travesty.
__________________
How PSI a stock can support?
Always Be Crushing!

Quote:
Originally Posted by JohnMc View Post
If you send me $20$14.99, I'll send you a how-to explaining how to make $20$14.99 from people on the internet.

Last edited by Kjets On a Plane; 08-04-2020 at 05:53 PM..
Kjets On a Plane is offline   Reply With Quote
Old 08-04-2020, 09:22 PM   #11
spock345
Board Member
 
spock345's Avatar
 
Join Date: Nov 2016
Location: Santa Cruz, CA
Default

Quote:
Originally Posted by Kjets On a Plane View Post
SUs & Dual downpipe iron conjoined manifold (no double butterfly, doesn't crack like the aluminum B18 manifold can) is pretty no-fuss/works well for carbs/stock bolt-in stuff if you don't want to spend cubic money/accept your primitive outdated slower vintage car to cruise around in.
Individual paper filters or somewhat rare 140 SU airbox fits nice in the 122.
Bias is always OE quality / junkpile, so 140 airbox probably, even if the filter costs *some* money now.

Beyond that, most everything gets vastly more expensive/less durable for usable power etc.

There was a place that did seals/bearings for the SUs, but just harder bushings & proper repairs seem to work well.

Pretty good compromise for performance, economy & complexity of the day before they installed a zillion vacuum lines/contraptions onto carbs to *try* to get them to burn cleanly.

Would just install EFI (even with D-jet parts) if going beyond recombining the stock SU junk-pile, especially if sticking with a B18 & B18 head over an EFI-valve size B20.
Carbs are always a compromise, apart from lacking electronics.
But the EFI intake look and one extra fuse/few electronics don't offend/is reversible if original matters.
Really have to be committed to carbs beyond the SUs in a lot of ways, apart from the fuel tank being somewhat lacking for baffles/electric pumps in some cars for EFI
& pushrod volvos got EFI anyway.

No sub-standard non-OE quality DGVs please, those things are a travesty.
I will likely keep this car carbureted for the novelty of it. All I have used the DGV for this far is a test drive when I bought the car and getting it into my driveway from a trailer. On the test drive it seemed like the secondary wouldn't kick in until the pedal was almost to the floor. Then it hit hard and fast. I am looking for something more linear and less on/off. Then again the weber wasn't tuned well at all and the accelerator pump was leaking.
spock345 is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump


All times are GMT -4. The time now is 01:15 AM.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.