Single Stock carb on a 1915...experience from successful use

GI Joe

I've searched a LOT of carb/engine threads and cannot seem to find an answer....Attempted this thread in the engine/performance area, but got bashed right away for thinking out of the box..
SO, here goes..
I built a 1915(69 crank x 94 jugs), Engle 100 cam, stock pushrods and stock DP heads, full flowed, Currently running a 009, but have stock vac advance dizzy in waiting. Been running a "tri Mill" style Thing exhaust, but switching soon to the Split Thing Shop dual exhaust and will be keeping my heater boxes. Driving at ~950 above sea level. I think that's the pertinent bits for you engine gurus..

I started with dual Kadron 40's, properly jetted for the 1915 and couldn't get them right. Switched to Dual Dellorto 40's, properly jetted and cannot get them synched properly. About fed up with the duals, and can't find anybody that can set them up right.. Mad

This is a weekend, fair weather cruiser with mostly 2 lane highway driving(steady 55mph) with some interstate and some in town driving. I am looking for driveability and NOT for total performance. I want smooth power, longevity, decent mpg, and ease of maintenance/tuning. Don't plan on drag racing, or rolling 85 mph down the interstate.

Seriously thinking on going back to the 34 pict 3 and vac dizzy, Or a single Dell 40. I've read all the hate threads on the single carbs, yet have read of plenty of folks successfully running them. Don't waste your hate on me! Found a site from Mike Humeston, who succesfully runs 34pict 3 on his bigger engines, but can't get any contact from him. Pertinent responses are appreciated!
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Ian Epperson · Posted: Sat May 12, 2012 8:15 pm Post subject:

Hate threads for single carbs? Maybe in the performance dept, but it's probably fine for most stock engines - easier to deal with.

I suppose I'd chime in with the (non a-holes) who are encouraging you to stick with the dual carbs, but if you really want to go single, you should probably find the biggest throat you can. 40mm x2 gives you 2513 sq mm of intake. 48mm still only gives you 1809 sq mm - I'm not sure you can go any larger with off-the-shelf parts. 34mm would choke it all the way down to 908 sq mm - way small for that engine.

For drivability, I'd dump that 009 and use a vacuum advance + mechanical dizzy to help smooth transitions when accelerating. Changing that by itself will probably significantly affect the drivability - maybe change that first and see how well it works out? You'll have to run a vacuum line between the carbs or manifolds to get it set right. Solomon Grundy is running duals with a vac advance on a 2.0 T4 and it runs nicely.
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GI Joe · Posted: Sat May 12, 2012 8:37 pm Post subject:

Thanks Ian...LOL... No argument on the performance of the Dells(when setup properly)...
I thought about changing the dizzy out, but my 009 is running great with this setup. I don't have stumble issues at all..
My main issue(only issue?) is one side leading the other at cruising speed...
Seems like I am running around on 2 cylinders most of the time.....

Your comment of "easier to deal with" is what I am looking for. It's not pleasurable to drive Our Thing right now. I'd like to just hit the key and go.

I can't believe this setup is supposed to be So easy, yet noone around me will step up to help...(yes, I've asked.) Not looking for a fish, just someone to teach me How to fish!!!
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GI Joe · Posted: Sat May 12, 2012 8:47 pm Post subject:

I am looking for information, advice, parts sources, etc. on setting up my engine with a single center mount carb, whether it be a 34 pict 3, or a Dell. I don't have to have "stock" appearance, But the Thing engine bay doesn't leave much room for a tall center mount intake(i.e Dellorto/weber)

I'm leaning toward the 34 pict 3 for simplicity and ease of maintenance, and driveability.

Hope that clears up my request a bit... Since I forgot to actually state a direct question in my initial post.. Embarassed
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FORWARD: forward is only a good thing, when you're facing the right direction!

'74 Thing, "Our Thing"....
http://www.thesamba.com/vw/forum/viewtopic.php?t=4...p;start=60
www.NLEOMF.com
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Ian Epperson · Posted: Sat May 12, 2012 9:38 pm Post subject:

74 Thing · Samba Member Joined: September 02, 2004 Posts: 2052

Read this thread and PM Alstrup and Spencervee for their advice. It can be done with some work and they both have experience and can probably make some suggestions to get you close to what you want to do.

http://www.thesamba.com/vw/forum/viewtopic.php?t=499235&highlight=venturi++pict

citroen · Posted: Sun May 13, 2012 2:53 pm Post subject:

Ok joe you know of me and my brother i dont tell you something that i have not tried. I have a 1775 with stock heads the only things done to the heads are a hemi cut that i did. i run a engle 100 cam, bugpack exhaust with dual quiets 12 lb flywheel, and a stock 34pict carb with 135 main jet. Also (and they can still holler) but i run a 009 with points. Good mileage not great but good , Starts and runs good i drive it everyday, 8500 miles in a year and a half. I drove to a show yesterday with 4 adults 1 kid pulling a small trailer with the grandkids cars on the trailer. 54 miles each way checked the temp with a heat gun when i got there 208 at the block. This was on country roads up and down hills. Also i run a 74 bug transmission. If they want to yell at me, go on it will not be the first time. i just know it works for me.

GI Joe · Posted: Mon May 14, 2012 5:01 pm Post subject:

Thanks for the positive responses fellas!!!
I've got contact with Alstrup and Spencervee already... Starting to gather info!

Dennis, I've got to say, you're one of the first Things that comes to mind when I think about going this route. I'd love a ride in your Thing to see how that 1776 pulls with the 34pict.... If I haven't completed the swap by Kubeltreffen, Maybe i'll get a chance! Unless ya'll are going to be near Knoxville anytime before that!! I'd meet up with ya for a chance to pick your brain!
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FORWARD: forward is only a good thing, when you're facing the right direction!

'74 Thing, "Our Thing"....
http://www.thesamba.com/vw/forum/viewtopic.php?t=4...p;start=60
www.NLEOMF.com
Respect, Honor, Remember

wv181 · Posted: Mon May 14, 2012 6:30 pm Post subject:

Just my $.02 but I thought this be worth checking out.
http://www.humeston.org/vwthing3/?page_id=16
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1973 Thing - running project

wv181 · Posted: Mon May 14, 2012 6:51 pm Post subject:

Just my $.02 but I thought this be worth checking out.
http://www.humeston.org/vwthing3/?page_id=16
_________________
1973 Super Beetle - sold
1973 Thing - running project

citroen · Posted: Tue May 15, 2012 5:27 am Post subject:

hey joe anyone at the kubeltreffen can drive my thing and see how it works i will be there hope everyone else can. i am through your town but most the time i am picking up new cars for my old work send me a private message with your phone number i will call next time i am passing through. hope to see you at the show. Anyone else driving thru louisville is welcome in the domeck brothers garage we always have a few things we are restoring in the garage

GI Joe · Posted: Tue May 15, 2012 6:57 am Post subject:

wv181 · Posted: Tue May 15, 2012 1:46 pm Post subject:

As I rebuild my 73 I plan on using alot of his ideas also. Still debating the airscoops but with the mods to them he describes it sounds like a it might be worth a try. I also kind of like the look.
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1973 Super Beetle - sold
1973 Thing - running project

Pandion · Posted: Wed May 16, 2012 11:19 pm Post subject:

uberautowerks · Posted: Thu May 17, 2012 12:19 am Post subject:

I've had several customers run stock 34 PICT's on 1914s over the years.
As long as the cam is mild (100) they work quite nicely especially when paired with either a SVDA or a DVDA.

I say go for it.
Yeah you won't have the top end power of the duals.
But you will have great low end grunt to get from light to light.

Get a new Brosal 34 PICT and a new "Bruck" SVDA.

Eric
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GI Joe · Posted: Thu May 17, 2012 12:57 pm Post subject:

It is a 100 cam Eric... Just picked up the carb today. Going to get it rebushed and do a rebuild on it, then start hunting jets and do whatever else needed to it to make it work!

As I stated in the original post, top end power is not my goal as this is a family cruiser. Just need to hit the highway with no worries and move along in traffic, and Not have to fiddle with tuning every 3 days! LOL...
_________________
FORWARD: forward is only a good thing, when you're facing the right direction!

'74 Thing, "Our Thing"....
http://www.thesamba.com/vw/forum/viewtopic.php?t=4...p;start=60
www.NLEOMF.com
Respect, Honor, Remember

citroen · Posted: Fri May 18, 2012 5:51 am Post subject:

Joe that is the cam i use the only jet i changed on my was the main jet went to a 135 it works great

GI Joe · Posted: Fri May 18, 2012 1:14 pm Post subject:

Dennis,
As to not assume on my end. Please give an account of what all had to be done to your 34pict 3 in order to run it on your 1776.

I picked up the intake bits from my Moms today, I'll sandblast them and get them painted up soon!

I've spent about an hour each day for two days driving and tweaking the linkage on the duals. I can make it worse, but it'll only get so close... I'm fed up with fiddling!
_________________
FORWARD: forward is only a good thing, when you're facing the right direction!

'74 Thing, "Our Thing"....
http://www.thesamba.com/vw/forum/viewtopic.php?t=4...p;start=60
www.NLEOMF.com
Respect, Honor, Remember

citroen · Posted: Fri May 18, 2012 3:37 pm Post subject:

i changed the main to 135 made sure the sprayjet sprays in the correct location. I set mine so the jet sprays in 1/4 of the barrel take the center and set it so the jet sprays 1/2 way from center to the side i adjusted the jet so it sprays as soon as the throttle moves. Back in the old days when when we had the problem with hesitation with a stock engine the factory had us measure the amount that the spray jet sprayed and set the jets location the same as i said. i also did fill the hole in the butterfly and i do use a 009 dist. i know people will say this is wrong i just know what works for me with over 8900 miles now. no hesitation starts great and runs great.

GI Joe · Posted: Sat May 19, 2012 4:37 pm Post subject:

Edit: pics added..

OK, Picked up a real 34 PICT 3 from a buddy yesterday.
Tore it apart today, as it was due for a refresh...
Currently it has the following jets with these numbers/letters stamped:
Main- 127.5
Air Correction- .75 Z
Aux Idle Speed- G 55

I did note the venturi has a 26 stamped on it... I guess I am confused to the 34 in the carb title.. Isn't that a 34mm venturi? Is the 26 sufficient, or do I need a bigger one?

I'll soak the whole thing in the Zep tank at work and give it a tumble in a polisher to clean it all up, then rebuild with fresh diaphragms and gaskets.
Should be ready for install this week! I'm debating using the original air cleaner, or just using an aftermarket unit...
Anyone have an aftermarket unit(bigger than the standard 5" chrome jobbies) they would like to send me?
Good tip on the nozzle Dennis, I'll make sure to set it as you said.
Here are the bits I have gathered for the swap! (Oil bat cleaner not pictured)
Image may have been reduced in size. Click image to view fullscreen.

Image may have been reduced in size. Click image to view fullscreen.

As aside, is this a Stock DVDA Dizzy? If not, what is it?
_________________
FORWARD: forward is only a good thing, when you're facing the right direction!

'74 Thing, "Our Thing"....
http://www.thesamba.com/vw/forum/viewtopic.php?t=4...p;start=60
www.NLEOMF.com
Respect, Honor, Remember

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Single Stock carb on a 1915...experience from successful use
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