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67dragbug
Samba Member
Joined: March 15, 2007
Posts: 132
Location: Rockwell, NC
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 Posted: Tue Oct 07, 2008 9:04 am Post subject: Hole in throttle plate on 34 pict 3 carb? |
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| Hi, I just bought a 34 pict 3 carb for the 1600dp in my 1963 bug and the guy mentioned the hole in the throttle plate has been riveted closed. Why? Do I need to drill it back out to open it up? What is the benefit of having it closed? This is a stock 1600dp. Thanks! |
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ev88f
Samba Member
Joined: April 07, 2008
Posts: 139
Location: North Port FL
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| Posted: Tue Oct 07, 2008 1:56 pm Post subject: |
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usually people do this for a half assed fix if theyre using an 009 dist. it somewhat compensates for the flat spot hesitation when using a pict 34 with an 009.
personally, id drill it back out depending on what distributor youre running |
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67dragbug
Samba Member
Joined: March 15, 2007
Posts: 132
Location: Rockwell, NC
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| Posted: Tue Oct 07, 2008 2:05 pm Post subject: |
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| Well, I am running an 009, and I've read all the tons of threads about a 34-3 and an 009, but the car has a 30 pict 3 on it now and it is struggling. So I should leave the hole shut and try it like that first? I am hoping to be able to get it properly tuned so that the 009 and the 34-3 can work together. Thanks. |
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ev88f
Samba Member
Joined: April 07, 2008
Posts: 139
Location: North Port FL
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| Posted: Tue Oct 07, 2008 2:26 pm Post subject: |
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| hell it's worth a shot. i've never tried the rivit myself, usually i just swap the 009 out for a vaccum advance distributor. can always try it and see if it works, if not, drill it out and see what happens |
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ev88f
Samba Member
Joined: April 07, 2008
Posts: 139
Location: North Port FL
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| Posted: Tue Oct 07, 2008 2:35 pm Post subject: |
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| with mine, i had the typical 009 with 34 pict problems, poor starting, no idle, really bad flat spot, 8 miles to the gallon etc... i fought it for a year before i took a junk dual vaccum distributor i had layin around in a parts engine and through that in. only half of the vaccum can worked and even then i noticed much improvement. i finally found a good vaccum can in a junkyard bug and picked that upfor 3 bucks, now its a hundred times better than it was. starts on a dime, great acceleration, better idle and 24 mpg. you might want to consider that option, i got about ten bucks total wrapped up in mine just in points and the junkyard vaccum can. |
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keifernet
Samba Search & Rescue
Joined: May 11, 2002
Posts: 19395
Location: Samba Center for Behavioral Science
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| Posted: Wed Oct 08, 2008 5:52 am Post subject: |
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If the rivet has closed the hole up completely then drill out or try to knock out the 'center' of it. The hole just needs to be a bit smaller, not completely closed up.
This does work for running with 009 on German "DVDA flange # carbs" as they are the ones with the larger hole in the throttle plate. It allows you to tune/set the carb at idle properly ( otherwise it's common that people cannot get the idle down to 900... big brass screw screwed all the way in even.... with the hole closed up a bit the mixture and air volume screws can be set.
If you check your flange # against the chart you will see what distributor yours was matched too.
Even some new or used SVDA do not run well or have issues working with a carb that was originally supposed to match up with a DVDA and time 5 degrees retarded.
But naturally a vac distributor would be nice. |
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