Dual Carb Setup? Weber 40 IDFs or 44 IDFs

[JerryvanDaniel]

I've searched on The Samba and did a little googling and haven't been able to find what REALLY should be on my 2.0 ltr Type IV engine. I recently rebuilt it and increased my compression ratio to 8.2:1. I'm running Weber 34 ICTs on it now and was told by a local shop that the EMPI 40 HPMXs were just as good as the Webers but I'm not convinced yet that that's the case. I don't want to get in to a discussion on EMPI vs Weber but I wanted to know

a) What carb setup is recommended for these 2.0 ltr Type IV engines in a '83 Vanagon Westfalia? Should I just stick with my Weber 34 ICTs?

b) What seems to work best for jetting them (I know everyone's setup is different. I just wanted opinions that would get me close. JETTING IS EXPENSIVE)

Thanks in advance! I've read a lot of different threads on it already. Here are two of them:
https://www.thesamba.com/vw/forum/archive/index.php/o-t--t-363096--.html
https://shoptalkforums.com/viewtopic.php?t=84254
_________________
****************************************
1983 VW Vanagon Westfalia Aircooled 2.0 ltr

Jerry's always singing the Blues

[markswagen]

What's wrong with the fuel injection system, it'll be far better long term.
I have a customer right now, with issues with his injection system, he's contemplating switching to twin carbs, I think it's a bad idea.
_________________
markswagen {mobile mechanic} san diego area all early VW's cared for.

619 201 0310

[JerryvanDaniel]

markswagen,

The van had carbs on it when i bought it. I haven't been able to source the fuel injection system for it but would definitely entertain the idea of it if you knew where i could get a FI setup.
_________________
****************************************
1983 VW Vanagon Westfalia Aircooled 2.0 ltr

Jerry's always singing the Blues

[markswagen]

There's a guy in LA I think, his name is Stuart, he bought a complete engine from a customer of mine, to replace his,that he had blown,he had the parts for sale, he's on here regularly, I cannot remember his username.
I might be able to find a complete set up, that would be a few weeks away, as we have a camping trip planned and some other stuff.
If you can't find, holler, and I will see what I can find.
_________________
markswagen {mobile mechanic} san diego area all early VW's cared for.

619 201 0310

[JerryvanDaniel]

[NobyDoby]

What about Dellorto's 40 DRLA?
_________________
1980 Aircooled Type 4 CU 2.0L T3 Westfalia:
Flowed AMC 39x33mm heads with Porsche swivel adjusters and CR 8.0:1
94mm Mahle dished P/C's & 71mm Stroke
Original VW CU Bus Hydro Cam w/Febi Hydro Followers
Dual Dellorto's DRLA 40 - 32 Venturi's
SyncLink Throttle System
MSS Central Airfilter
123Ignition Tune & NGK BP6ET
Vintage Speed Dual Side Super Flow Type 4 Exhaust

[JerryvanDaniel]

[MarkWard]

I clicked on that link. The kits pictured are for upright engines. Not what you have at all. I can tell you that a standalone engine management system has some growing pains.

There is an old myth that bigger is better. An engine is only a pump. In stock config, it can only pass so much air. More CFM won't help and could hurt. You need to look at what rpm range you will be mostly operating in.

Dual carbs with quality linkage, can be set to run and shouldn't require a lot of fiddling once setup. Not many people left that can tune dual carbs though.
_________________
☮️

[JerryvanDaniel]

[NobyDoby]

In short: smaller (34 ICT’s) will give bit more torque at lower rpm’s but will restrain the horses at higher rpm’s. Bigger (40 IDF’s or DRLA’s) might give a bit less torque at bottom rpm but give a few more horses. Going bigger might not give more horses but will definitely result in less torque. 40’s with not to big venturi’s might give the best result.
All depends on the kind of venagon the engine is mounted in and/or what kind of engine character you want.
In my case it is in a heavy westy and I want a engine with a lot of torque over broad range starting at low rpm. Also wanted a decent fuel economy.
_________________
1980 Aircooled Type 4 CU 2.0L T3 Westfalia:
Flowed AMC 39x33mm heads with Porsche swivel adjusters and CR 8.0:1
94mm Mahle dished P/C's & 71mm Stroke
Original VW CU Bus Hydro Cam w/Febi Hydro Followers
Dual Dellorto's DRLA 40 - 32 Venturi's
SyncLink Throttle System
MSS Central Airfilter
123Ignition Tune & NGK BP6ET
Vintage Speed Dual Side Super Flow Type 4 Exhaust

[JerryvanDaniel]

[MarkWard]

I sent you a PM
_________________
☮️

[NobyDoby]

My setup gets my Westy up the d@mn hill.
It has a very flat curve with 125Nm at 1500 rpm, 145Nm between 2500 and 3500 (almost flat) and the falling back to 125 Nm at 4500Nm.
Average fuel economy last 5000km: 19 mpg (8,3 km/l).
_________________
1980 Aircooled Type 4 CU 2.0L T3 Westfalia:
Flowed AMC 39x33mm heads with Porsche swivel adjusters and CR 8.0:1
94mm Mahle dished P/C's & 71mm Stroke
Original VW CU Bus Hydro Cam w/Febi Hydro Followers
Dual Dellorto's DRLA 40 - 32 Venturi's
SyncLink Throttle System
MSS Central Airfilter
123Ignition Tune & NGK BP6ET
Vintage Speed Dual Side Super Flow Type 4 Exhaust

[whip618]

I ran Dellorto'S on type IV'S for years, I think the Dellorto 40 DRLA would be the best choice for carbs, the FI would of course be the best option.

Phil
_________________
Life is simple....either you're qualified or you're not.
USSVI.......Pride Runs Deep
USSVI Life member and Holland Club member

Samba Member No. 3307

[JerryvanDaniel]

Update on my current carb setup. I hadn’t heard much about what Venturi people had in their carbs but I pulled mine yesterday and the markings said “50” and then underneath the 50 was a “4 deg” marking. I’m assuming the 50 was in mm but I’m not sure what the 4 deg actually is in respect to. My jets right now are as follows:

Idle: 65
Main: 140
Air corrector jet: 160
F6 emulsion tube
Float needle: 175
Venturi:50 4degree

I think I’ve decided to stay with the 34 ICTs for now but may eventually switch to a pair of 40 or 44 IDFs

Thoughts on that Venturi? That sounds rather large. My spark plugs right now have a build up of gray on them which I believe would indicate running on the leaner side.
_________________
****************************************
1983 VW Vanagon Westfalia Aircooled 2.0 ltr

Jerry's always singing the Blues

[MarkWard]

I think you need to measure the throttle plate diameter and the inside dia of the venturie to know. 1 inch = 25.4 mm.
_________________
☮️