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Purpose of venturi lock screw?

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General_Failure Use your head, don't abuse it!

1,036 posts · joined Jun 2004 ·

#642548
What's the purpose of the venturi lock screw? Don't say to lock the venturi. In a classic example of my lack of observation skills I realised that I have the nice little pointy ended one in the left hand carb of my 1800, but the right hand side... well it had a tinware screw in it. You know the sort with the little cutting in the thread for scraping up gunk? One of them. On that same carby I also noticed that the choke butterfly stop screw that protrudes into the throat is some kind of countersunk head bolt from a hardware store, which would probably mean an imperial thread. Eeee!

I pulled out the tinware screw and screwed in a new flat ended HT bolt. Not optimal, but the cutaway in the thread couldn't have been helping things. So, would the completely wrong type of screw be messing with things?

Thanks.
If at first you don't succeed. Build, build again.
Vehicle: 1975 Special order delivery walkthrough panel based LCA pop-top camper. Motor: Nippon 1.8L Single port Wasserboxer, Transmission: 3 rib 002.

greedy53 Bishop of Volkswagenism

3,062 posts · joined Mar 2006 ·

#642608
they hold the tube in place thats all but thats enough
👍👍😂🙅🥷😬🤓

General_Failure Use your head, don't abuse it!

1,036 posts · joined Jun 2004 ·

#642669
Right, so the reason it is a grub screw (Did I actually remember the terminology for a change?) is to clamp the tube. Well it has never moved so I guess it'll do. I have a funny 30PICT, or something like it that I pulled off my S beetle years ago. I'll see if it has a compatible screw on it when I get the time.

That carby I removed had a stack of vacuum lines that were blanked and an adapter plate so it could fit on the T tube. I still don't get why anyone would go to so much trouble to fit a smaller carburettor to it.

Thanks for the answer by the way.
If at first you don't succeed. Build, build again.
Vehicle: 1975 Special order delivery walkthrough panel based LCA pop-top camper. Motor: Nippon 1.8L Single port Wasserboxer, Transmission: 3 rib 002.

matberry Moderator Go hard or go home

8,114 posts · joined Mar 2006 ·

#642672
General_Failure wrote:Right, so the reason it is a grub screw (Did I actually remember the terminology for a change?) is to clamp the tube. Well it has never moved so I guess it'll do. I have a funny 30PICT, or something like it that I pulled off my S beetle years ago. I'll see if it has a compatible screw on it when I get the time.

That carby I removed had a stack of vacuum lines that were blanked and an adapter plate so it could fit on the T tube. I still don't get why anyone would go to so much trouble to fit a smaller carburettor to it.

Thanks for the answer by the way.
Cause it was NEW
Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE

vw54 Administrator Always Waiting 4 Friday

16,723 posts · joined Aug 2002 ·

#642673
to lock the venturi
thats exactly what its for
I read it on FACEBOOK so it must be true


http://forums.aussieveedubbers.com/viewtopic.php?tid=91278&page=1#pid848630


http://forums.aussieveedubbers.com/viewtopic.php?tid=63561&page=1#pid624099


http://forums.aussieveedubbers.com/viewtopic.php?tid=4832&page=1#pid452603


http://forums.aussieveedubbers.com/viewtopic.php?tid=60650&page=1#pid574409

General_Failure Use your head, don't abuse it!

1,036 posts · joined Jun 2004 ·

#642791
vw54 wrote:
to lock the venturi
thats exactly what its for
Well... yeah. I was just worried that the point on the end of the screw had some kind of significance besides superior locking ability. That's all.
If at first you don't succeed. Build, build again.
Vehicle: 1975 Special order delivery walkthrough panel based LCA pop-top camper. Motor: Nippon 1.8L Single port Wasserboxer, Transmission: 3 rib 002.

Joel Now containing 100\% E-Wang

9,368 posts · joined Feb 2006 ·

#642796
Tristan the beetie single solex carbs have pressed in vents
so no grub screw on them

General_Failure Use your head, don't abuse it!

1,036 posts · joined Jun 2004 ·

#642902
Oh well. Guess I can use it to throw at the neighbours cats or something then 😀
If at first you don't succeed. Build, build again.
Vehicle: 1975 Special order delivery walkthrough panel based LCA pop-top camper. Motor: Nippon 1.8L Single port Wasserboxer, Transmission: 3 rib 002.