1776 engine with single 34pict3 carb

[Superbj]

I have a newly built 1776 motor and also a rebuilt German made 34pict3 and SVDa distributor. I am now trying to dial everything in and I noticed a lot of information about carb needs. Specifically, despite many of you that would prefer dual carbs, I have been under the impression a single carb will work fine. My motor has stock Rods, Cam, Lifters, rockers and flywheel, a 69mm counterweight Crank, 37.5 x 32mm valves and 90.5mm pistons. My builder recommended I use a 1.4 main jet, which I have installed. So, bottom line, there are a lot of variables to sort out to get the engine fine tuned, but am I correct in that this set-up will work just fine without any other 'engineering' problems to consider now that it is up to a 1776?

[jinx758]

To run optimally you need to have HEAT going to the intake runner.
Without this it will run but have driveability issues.
No vacuum leaks as well.

I was quite happy with my 1776cc/PICT34-3 set up until the carburetor rebuild revealed bad throttle shafts.
I took it to a muffler shop to have a scavenger pipe installed.
Easy peasy.

Since about 2017 I put an EGAS38mm & has been great since.

Good luck ... stay safe

jinx
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" It's not valuable unless you learn something from an experience. " Henry Ford

It's not unlike the same difference ...

My Craigslist rescued 100 footer :
1971 Standard Bug
1776cc dual port
034 distributor
38mm EGAS Carburetor

[Cusser]

Back about 1979 or 1980, my friend ran an 1835cc DP engine using stock 34PICT-3 carburetor and stock distributor, it ran fine.

Myself, I use a single carburetor on my 1835cc DP engine, but it's a Weber 40DCNF from 1976, and it's never been off its manifold. I use a vintage German 009.

Both those 1835cc engines use a stock camshaft.
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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

[Superbj]

Thank you both for the feedback. I wanted to make sure I was heading down a reasonable path before I got too far.

[beetlenut]

I'm running a 1700 on a 34 PICT 3 with SVDA. I've been slowly dialing in the jetting. I'm running a 135 main and a 57 idle jet right now, and it's running pretty strong, so I'm close. Might still go back down to a 55 idle, and see if I get any better performance. With your 1776, a 140 main and maybe a 57 or 60 idle would be a good place to start dialing it in IMO.
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scrapyards are for quitters
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[paul makuh]

hi, I have a 1776, mild cam, 009 dist. it gets 27 degrees advance, at ten before tdc, has a dog house cooler and a two level remote cooler, and with a 34 pict it overheated almost to 275, at 60 mph, swithched to 40 kadrons , and it still got to 225, all this in a 67 bus with reduction boxes, thinking of trying a couple of empi 40mms, and trying to get more than 10 miles per gallon, am I dreamimg?

[wcfvw69]

My bay bus had a stock engine other than 90.5 pistons that made it a 1776. I ran a rebuilt German Solex 34-3 carb and an original restored DVDA distributor. I remember I put a bigger main jet in it and possible a slightly bigger idle jet.

The engine ran great and no overheating issues, even in hot Arizona.

[email protected] bores out the throats of the 34-3 carbs to make them even bigger. I know a couple of folks who had that done with like 1900cc engines. They ran great.

The advantage of modifying the 34-3 carbs is you still have the correct ported vacuum to work the vacuum canisters on the SVDA or DVDA. Most dual carbs do not put out the right amount of ported vacuum w/out modification.
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[Superbj]

Bill, actually I am using a restored SVDA distributor that you did for me, combined with a restored 34pict3 that Tim did for me. I have a 1.4 main jet and she runs great at highway speeds but I have some idle issues when warm like so many do. My next step is to increase the idle jet a size. There is an abundance of information available to tune the carb but I am assuming most of these instructions would only apply to stock builds when the instructions get down to specifics such as detailed as a 1/4 turn. For a newbie like me it has been more of a challenge to dial things after I made a few changes (such as the 1776). Anyway, I am getting close and I appreciate the knowledge so many have here.

[beetlenut]

[wcfvw69]