Maximum engine size on a single carburetor?

[m.abbadessa]

Hi, im wanting to build my 1679cc engine a little bigger. It is in a sandrail and for the sake of keeping it simple and having less moving parts I want to stick with a center mounted carb. What is the biggest engine you all would recommend for a center mounter carb? And what heads and cam?
Thanks

[71StandardReduction]

Which carburetor will you be using?
_________________
One thing I ask from the Lord, This only do I seek:
That I may dwell in the House of The Lord all the days of my Life, to gaze on the beauty of The Lord and to seek Him in His Temple~Psalms 27:4

YHWH NISSI
YHWH SHALOM

64 Pan Buggy
https://www.thesamba.com/vw/forum/viewtopic.php?t=...mp;start=0

Ruby Red 1966
https://www.thesamba.com/vw/forum/viewtopic.php?t=779597&highlight=

https://youtube.com/@SCOFabwerx?feature=shared

[yamaducci]

Class 12 desert racers use a 44 IDF on a 2276cc with CB Wedgeport Heads and 1.75" intake manifold runners.
_________________
-John Cox
My 2498 Turbo Re-Build Thread: http://www.thesamba.com/vw/forum/viewtopic.php?p=5578697#5578697

3rd Brake Light Safety Stars- I still have a couple with blue light left. Email me if interested.

[earthquake]

Didn't FAT build some big Type 4's with single IDF's?

eQ
_________________
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]

[Vanapplebomb]

[m.abbadessa]

I plan to use a single weber 44.

[Dusty1]

If you look at big American iron tiny carburetors on oversized V8s are nothing new.

Going way back to 1932, Lincoln built a V12 similar to Ford's flathead V8 only half again bigger, literally.

The old Fords used a carb that looks similar to the old Holley Bug Spray.

The 5 liter Lincoln V12 used exactly one Bug Spray (ish) carb.

Maybe that's why old Bug Spray carbs get such crappy mileage?

More recently GM in general and Chevy in particular put one tine carb on anything they didn't view as a "high performance" application.


It won't be long until no one remembers what a carburetor is.

.
.

[earthquake]

I seem to recall a buddy of mine with a 2180 and a single Zenith 32mm carb in his Baja that hauled ass.

eQ
_________________
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]

[dustymojave]

[rodeking]

Interesting. What kind of power does that combo make and how would it be for a class 11 type build for street duty and light off road, eg. gravel/fire roads? Thanks.

[joemama]

I have Zenith 32 carbs on both my volkswagens. On my fiberglass buggy (just got it running again, after 9 years), I use it on a 1915 with an engle 110. Single Zenith. It has duned all over Glamis and Buttercup. On the same engine I have had a single 40 idf, and dual 40 IDF. I agree with Richard, that for climbing competition hill, the dual 40 was best, gave that kind of screaming high rpm performance that a smaller motor needs to climb big hills made of sand. However, I went back to the zenith for its outstanding reliability. Its fantastic offroad, doesnt mind hills, bouncing around. I also have a class 11 look alike, that unfortunately I have not had time to use much as intended. For that I also have a single zenith 32, on a 1776 with engle 100. I feel its also great on that application. Zenith 32 on an 1835 used to be a favorite both street and offroad.
Thing is, you have to find a used carb in good condition, as well as a manifold. You can buy new webers or copies.

[Vanapplebomb]

A quick look into the float bowl will tell the story why they are so good off road. Look at that bowl volume surrounding the emulsion tubes. They are nearly centered. The closer to center, the more consistent the fuel level is inside them when tipped on angles, or fuel sloshes. It kind of averages out near the center, keeping afr more consistent. The only other carb fitted to automobiles I am aware of that behaves like this is the SU HIF…beats the pants off a Holly on a Rover V8 when rock crawling, hands down.
_________________
1800 Type 4 Berrien 295

http://www.thesamba.com/vw/forum/viewtopic.php?t=487021

[dustymojave]

Not only is the float bowl centered on the Zenith, the float bowl vent is centered above the throat, with a thread for a fitting to add a hose to extend way up into a remote air cleaner.
_________________
Richard
Offroading VW based cars since 1965
Tech Inspection 1963 - 2012 SCCA/SCORE/HDRA/MORE/MDR +
Retired from building Bajas, Fiberglass Buggies and Rails in the Mojave Desert. Also Sprints & Midgets, Dry Lakes, Road Race cars. All types New and Vintage
SoCalBajas Member
Kicked Cancer's A$$...1st and 2nd round...Fight ain't over yet.

[rodeking]

Well I picked up what appears to be a good 32 NDIX on flea bay for 175. So this will support a 2180? seems small for that size. Maybe they were modded? I know there was a 36 and a 38 also I believe.

[dustymojave]

[rodeking]

Dusty, I wasn't questioning anyone's knowledge. That sounds great, if it goes flat at 5000 that's fine, I luv low to mid-range torque. I also scored a DGAV 32/36 in very nice condition off a Nissan 720 2.4 L engine for 100. I know everyone hates progressives but John @aircooled has the knowledge to set them up right and what he says makes sense and I'm always up for a challenge. As for manifolds I have the skills and welders, lathe, mill, etc to make my own. Lots of manifold heat is the key it appears.
Sorry to hear about your medical issues, it sucks. I always like reading your posts on here.

[PhillipM]

The only thing the small 32/36 carb limits you on really is outright power, you can make as much torque as you like so long as you accept that you're gonna be about 130-150bhp peak power. If that's enough power then it's not a problem.