Single Stock carb on a 1915...

GI Joe · Posted: Sat May 12, 2012 3:35 pm Post subject: Single Stock carb on a 1915...

I've searched a LOT of carb/engine threads and cannot seem to find an answer....
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 IDF. 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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vwracerdave · Posted: Sat May 12, 2012 4:03 pm Post subject:

Don't give up on the dual carbs. I would spend some more time learnig about dual carbs and how to sync them before I would even consider putting a stock carb on a 1915. A stock carb is not big enough for a stock engine.
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2010 Sportsman ET Champion - Mid-America Dragway - Arkansas City, KS
1997 Sportsman ET Champion - Thunder Valley Raceway Park - Noble ,OK
Featured in Dec. 2001 HOT VW's Magazine page 63

Watch my racing video's http://www.youtube.com/user/okvwracer/videos

spanky324 · Posted: Sat May 12, 2012 4:09 pm Post subject:

DarthWeber · Posted: Sat May 12, 2012 4:11 pm Post subject:

I won't mention hate if you don't mention stupidity. Understood?

Dual Dellorto 40DRLA's were absolutely, without doubt, THE RIGHT carbs for your engine. Synchronizing carbs is not that difficult. YOU can do this if you have the patience and willingness to learn. Have you read the tech articles by AirCooled.Net or Mark Harney on synchronizing carbs? They were written for you. There is also an accompanying article on jetting your carbs.

If you haven't sat down and spent a few minutes reading this material and possibly asking some questions on this forum then you have no right to just toss aside dual carbs.

Running a stock VW carb on a 1915 is a waste of time. The stock carb was actually too small for the 1600. No hate, just fact. Think about it.
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GI Joe · Posted: Sat May 12, 2012 5:25 pm Post subject:

I don't normally respond to useless posts on forums, but I'm in a mood today.

GI Joe · Posted: Sat May 12, 2012 5:30 pm Post subject:

VWRACERDAVE,
I appreciate the sentiment, and I've heard it plenty... BUT....(see original post) Great vids by the way!! the buggies look like a Blast!!

Clarification on original post..
I've had the carbs Synched at a local shop...He adjusted and set up the whole system, yet their is still a leading carb at cruising speed.
It's the linkage adjustment that I am having issue with.
I imagine this would be an easy fix with the right ear and experience, but I don't have it and haven't found anyone local that does.
Makes me wonder how all these folks are running dual carbs, when noone knows how to set them up proper.

Again, Pertinent responses are appreciated.
_________________
FORWARD: forward is only a good thing, when you're facing the right direction!

'74 Thing, "Our Thing"....
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www.NLEOMF.com
Respect, Honor, Remember

DarthWeber · Posted: Sat May 12, 2012 6:02 pm Post subject:

GI Joe · Posted: Sat May 12, 2012 6:04 pm Post subject:

ok..

Now, on with my original, Very specific questions.. About tuning/running a single carb(stock or IDF) on my 1915.
_________________
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

JRKman · Posted: Sat May 12, 2012 6:31 pm Post subject:

I've only been working on VW's, or cars in for that matter, for less than a year now. I didnt even know how to adjust valves less than a year ago.

I got myself a set of dual carbs, read up on them, and did the job. They ran like complete shit. I read and reread and reread everything, still ran like shit. Then I thought "Maybe I should get the proper tools such as a synchrometer." Got the tool, dialed them in, and it runs like a champ.

Without the proper tools it was a pain in the ass to tune. Make sure you have them, and try again, try again, try again. If no one knows how to do it around you, you need to teach yourself so that YOU can fix it in case it ever needs to be fixed. Takes some time and practice.

Here are some of the problems that made it difficult to tune when I was going at it:

-Vaccuum Leaks: Might as well not even bother unless you get rid of these
-Incorrect Jetting: Takes some trial and error but the many resources on here should get you in the ball park, they did for me.

ANYWAYS, Duals > Singles IMO, more power, better efficiency. If you are gonna throw your DRLA's away, send them to my address. Also, try to have patience on the internet...

-Josh

vwracerdave · Posted: Sat May 12, 2012 6:44 pm Post subject:

Post a few pictures of your linkage set up. Maybe we can see something that can help. Sometimes you can't always figure out a written question.

I think your throwing away 15-20 HP by not running the duals and going back to a stock carb.
_________________
2010 Sportsman ET Champion - Mid-America Dragway - Arkansas City, KS
1997 Sportsman ET Champion - Thunder Valley Raceway Park - Noble ,OK
Featured in Dec. 2001 HOT VW's Magazine page 63

Watch my racing video's http://www.youtube.com/user/okvwracer/videos

GI Joe · Posted: Sat May 12, 2012 6:47 pm Post subject:

Here's the setup Dave..

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

I sheered one of the downlinks yesterday while trying to adjust them, so I need to get that replaced. It may have been the straw that broke the camels back on the duals....
As I stated earlier, 1000 miles on a fresh redo and It's killing me to not have her running right. Patience is Out the window for me right now!
_________________
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

GI Joe · Posted: Sat May 12, 2012 6:53 pm Post subject:

modok · Posted: Sat May 12, 2012 8:11 pm Post subject:

If you want to talk about how hard it is to sync the carbs you an't gonna get no sympathy here brother, I betcha most of us can do that in under 1 minute...........but why you don't like duals it isn't really any of MY concern, that's your own choice, nothing wrong with that, people like what they like and there is no reason for it

For information about tuning the PICT for larger CC engines, we have several folks like Mark Harney and Kiefernet(who rebuild them) and a fellow who goes by Torben Alstrup, who knows a thing or two about putting them on larger cc engines.
If you want, you can do that, we "have the technology" Wink

For purchasing a single dellorto setup(which is ok too) contact A.C.E., "air cooled engineering"

With either system-
If you drive in colder weather you need a pre-heat system
If you drive on dusty dirt roads you need a GOOD airfilter

You can also consider the zentith, progressive, bugspray, DCNF, single kadron, they all have pros and cons
The dellorto 40 DRLA and zenith are probably the off-roaders favorites, far as single carbs

You didn't ask any specific questions......... what are your specific questions?

GI Joe · Posted: Sat May 12, 2012 8:25 pm Post subject:

GI Joe · Posted: Sat May 12, 2012 8:33 pm Post subject:

Standing corrected, I now will post my question! Sad

(Please see intro post for pertinent info on my specific setup/needs.)

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

Anyone with direct knowledge on this topic, please chime in.
And yes, I am a bit sarcastic And direct.. Don't take my responses personally! It's all in good fun... You'll know if I address you, then you can take it personally! Wink

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

modok · Posted: Sat May 12, 2012 8:42 pm Post subject:

THe main difference between the PICT and Dellorto, is the dellorto will likely require a lot of special parts that you will need to buy, fabricate or have made in order to work best, while the PICT potentially could be bolt on and go, since it does not require any special linkage, manifold, or air cleaner.

The dellorto can make an excellent setup, but the available kits aren't worth any more than scrap metal IMO, so it is more or less a DIY project.

GI Joe · Posted: Sat May 12, 2012 8:45 pm Post subject:

Modok,
You're referring to the connection that runs across the DS intake to connect to the throttle cable coming between the two tubes, Or the cable in sleeve style throttle cable that runs Over the fan shroud and thus requires a different air cleaner base with the guide for said cable/tube?

Am I missing something else?
_________________
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

modok · Posted: Sat May 12, 2012 8:53 pm Post subject:

essentially, yeah, you got it
The only two manifolds I would consider running are a 1 3/8 steel tubular manifold or a CB low profile(the cb had a heat passage). Both manifolds have room to allow the cable to pass through but they don't have any linkage, you have to make that, or use the cable linkage, the cable linkage is ok but I don't recommend you use the cb aircleaner base, since it does not filter well nor contain the fuel standoff well enough IMO.

modok · Posted: Sat May 12, 2012 9:01 pm Post subject:

The fuel standoff can shoot out the top as high as 8" with an isolated type manifold, most of the offroad guys run a big old airbox on top of the carb that connects to a large remote filter, so it does not bother them, the fuel fog is contained within the box.
I run a fabricated top thingy that connects to a filter that hangs over the generator, it contains the fuel standoff very well also, but there is no kit available that contains such a thingy.

I'm sure you don't want the engine eating dust nor soaking the filter with fuel, so you do have to do something about that.

Loopole · Samba Member Joined: October 20, 2003 Posts: 558

sync the carbs with the throttle cracked and and a snail, dont sync them at idle until you have them matched with the throttle just cracked, then use the idle screws to match them at idle, make very small adjustments to the linkage, you will get it, thats how to get rid of a leading carb..., take your time and you will be rewarded. The cb style linkage can be a bitch to get set up right, I found the berg linkage to be much easier to sync, and after four years has not needed adjustment. Once you get them dialed in it will be a very sweet running motor. Dont even consider going back to any centermount carb.

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