Modified 34pict-3

[aeromech]

Guys,
I'm building an 1800 type 1 engine for my 1971 bus. I want this to have a very stock look to it so this means keeping the original solex. I'm looking for someone that can modify my carb including jetting and boring the Venturi. I've already spoke with Tim at Volkzbitz.

_________________
Lead Mechanic: San Diego Air and Space Museum
Licensed Airframe and Powerplant Mechanic
Licensed Pilot (Single engine Land)
Boeing 727,737-200-300-400,757,767
Airbus A319,320,321
DC9/MD80
BAe146
Fokker F28/F100
VW type 1 1962,63,65,69,72
VW Type 2 1971 (3 ea.) 1978, 1969
VW Jetta
VW Passat
Capable of leaping tall buildings in a single bound

[Alstrup]

Nobody can jet the carb for YOUR engine. We can get in the ball park, but that´s not like perfect.
ACN sells 28 mm venturies that will suit an 1800 engine nice. If you send the carb to them or Blackline they will set it up the best they can.

[aeromech]

Yeah John is trying to sell me their modified Bocar for $350 but he didn't know if it had the vacuum port I need for the altitude corrector. A couple months ago Tim built me this completely original Solex with the correct flange number for a '71 bus. I'd like to keep using it. Thanks for the tip on Blackline. I forgot about those guys
_________________
Lead Mechanic: San Diego Air and Space Museum
Licensed Airframe and Powerplant Mechanic
Licensed Pilot (Single engine Land)
Boeing 727,737-200-300-400,757,767
Airbus A319,320,321
DC9/MD80
BAe146
Fokker F28/F100
VW type 1 1962,63,65,69,72
VW Type 2 1971 (3 ea.) 1978, 1969
VW Jetta
VW Passat
Capable of leaping tall buildings in a single bound

[rodjr]

Why not send yours back to Volksbitz and have him bore the vent? He bored one for me. If you ever wanted to go back to stock, just pick up a cheap core and steal the vent and.... all original again. As far as jetting, I am certain Alstrup can get you very close if he knows the details of the combo, then it will just be fine tuning from there.

[aeromech]

Tim didn't sound like he wanted to do it. I asked him first.

Hi Gary.

Sorry I missed your call. I have reamed the venturi for some customers, but Ive not tested one of these so I wouldn’t know what jets to use. They did post some findings on The Samba web page. I have used the stock 34PICT-3 with an 1835 engine and I loved how it drove, great low end power, but at the high end it wasn’t as drastic. Im not sure what jets I used, but I would try a 135 main and a .60 idle jet to start with, if you are upgrading the camshaft then the idle jet would probably need increasing in size more.
_________________
Lead Mechanic: San Diego Air and Space Museum
Licensed Airframe and Powerplant Mechanic
Licensed Pilot (Single engine Land)
Boeing 727,737-200-300-400,757,767
Airbus A319,320,321
DC9/MD80
BAe146
Fokker F28/F100
VW type 1 1962,63,65,69,72
VW Type 2 1971 (3 ea.) 1978, 1969
VW Jetta
VW Passat
Capable of leaping tall buildings in a single bound

[Frank Bassman]

I am one such customer. Thanks again Tim!


I have since installed dual 34 PDSIT's, but my jetting ended up as follows:

60 idle

75 air correction

137.5 main.

My vent was 27 mm in diameter.


Drove great, but I suspect I should have put a 140 main jet in there.

One thing. I used a header with not very great preheat. (Part of the reason I went to dual carbs...)

It was always too rich when warmed up, idle would fluctuate and it would drop and stall, annoyingly. A stock muffler would have been the solution for preheat, or modifying the header for proper preheat function.

If you do not have proper preheat you will chase your tail with stalling at idle on a hot day because it is too rich. Don't kick yourself, use a stock muffler or modify a header!

Having said that, a stock muffler is said to be very restrictive on a larger displacement engine... I would modify the header.


-Frank

[aeromech]

I already have a stock muffler so for me keeping that is easy. What I was thinking though was that I need more airflow through a bigger venturi as well as exhaust but I never considered heating the manifold. A big question for me remains which exhaust system to use.
_________________
Lead Mechanic: San Diego Air and Space Museum
Licensed Airframe and Powerplant Mechanic
Licensed Pilot (Single engine Land)
Boeing 727,737-200-300-400,757,767
Airbus A319,320,321
DC9/MD80
BAe146
Fokker F28/F100
VW type 1 1962,63,65,69,72
VW Type 2 1971 (3 ea.) 1978, 1969
VW Jetta
VW Passat
Capable of leaping tall buildings in a single bound

[Brian]

Gary, I'll see if I can dig up which jets I used. But the above sounds like what I used. After you get it bored out just throw the LM1 on it and you can get the jetting down.

I'm still curious too for the exhaust. You already know how I feel about vintage speed. But this is the one I used on the truck: https://www.cbperformance.com/product-p/3644.htm
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[aeromech]

That 1 1/2 inch exhaust is too big
_________________
Lead Mechanic: San Diego Air and Space Museum
Licensed Airframe and Powerplant Mechanic
Licensed Pilot (Single engine Land)
Boeing 727,737-200-300-400,757,767
Airbus A319,320,321
DC9/MD80
BAe146
Fokker F28/F100
VW type 1 1962,63,65,69,72
VW Type 2 1971 (3 ea.) 1978, 1969
VW Jetta
VW Passat
Capable of leaping tall buildings in a single bound