Adjusting the twin Carbies on a \'77 Kombi?????

fekkinell Wolfsburg Wizard

655 posts · joined Jun 2005 · 30 Aug 2005, 12:48 pm

#402505

I recently had my carbies rebuilt by a local mechanic... They don't seem to be particularly good at tuning since both my van and my girlfriends beetle constantly have issues with the carburettors.... I don't want to take it back to them but i don't have the money to go elsewhere for the time being...

At the moment my girlfriends bug (Original 76 L Bug)seems to clog its airfilter up with black soot within a month or two of it being changed... so much so that it chokes the car and it stalls.

Also, since the rebuild on my carbies in the van, the idle seems to be incredibly high but settles down when you give the accelerator a tap... I thought it might just be a sticking cable/linkage or something but i've checked them all and even given it a rev by grabbing the cable in the engine bay... I am so totally in the dark on this one.

I know this one's a big request but could anyone give me some advice, mostly about how to tune the twin solex setup on a '77 kombi?

Thanks so much 🙂

Bizarre Moderator The artist formerly known as blue74l

12,789 posts · joined Aug 2002 · 30 Aug 2005, 1:39 pm

#402525

http://www.clubvw.org.au/tuning_tips_for_tips_twin_carb_k.htm

This is from Club Vee dub

Have a read and ask some Q's

Some thing seems REALLY wrong if the L bug is clogging the air filter THAT much THAT quicklynn[ Edited on 30-8-2005 by Bizarre ]

Futue te ipsum!!!

barls Administrator Causer of Chaos and Mayhem

9,474 posts · joined Jun 2004 · 30 Aug 2005, 2:12 pm

#402534

i had something similar on my bug with it clogging the filter and it had blow-by and was pressurizing the sump basically pumping the oil out it to the filter. the motor ended up dropping a cylinder at 110km in a week or so after

“We all pay for life with death, so everything in between should be free.” Bill Hicks
the chaos project - click me

Bizarre Moderator The artist formerly known as blue74l

12,789 posts · joined Aug 2002 · 30 Aug 2005, 2:29 pm

#402541

re the L bug

Yeah - you could try disconnecting the pipe from the oil filler to the air filter.

If it stops clogging the the filter then that is your problem

Futue te ipsum!!!

fekkinell Wolfsburg Wizard

655 posts · joined Jun 2005 · 31 Aug 2005, 12:37 pm

#402854

Bugger.... so basically I'm assuming if the sump is pressurising then it's something along the lines of piston rings, or the cylinders causing backpressure... or something like that???

barls Administrator Causer of Chaos and Mayhem

9,474 posts · joined Jun 2004 · 31 Aug 2005, 12:46 pm

#402856

mine was caused by one of the pistons having an air gap down one side past the rings caused by pinging hence the compression and expanding gases from ignition were going straight to the sump.

“We all pay for life with death, so everything in between should be free.” Bill Hicks
the chaos project - click me

Bizarre Moderator The artist formerly known as blue74l

12,789 posts · joined Aug 2002 · 31 Aug 2005, 12:50 pm

#402857

fekkinell wrote:Bugger.... so basically I'm assuming if the sump is pressurising then it's something along the lines of piston rings, or the cylinders causing backpressure... or something like that???

Basically yes.

out of round cylinders
ring gaps not off set
broken rings

But check first. Disconnect that hose.

If it was THAT much blow by on a 1600 i would have thought you might have noticed a lack of power.

Also the black would be oily not sooty??

Futue te ipsum!!!

barls Administrator Causer of Chaos and Mayhem

9,474 posts · joined Jun 2004 · 31 Aug 2005, 1:16 pm

#402866

i didnt notice it till it completely let go and that was a couple of weeks later right after i mentioned it to the old man that it didnt feel right on the trip up.

“We all pay for life with death, so everything in between should be free.” Bill Hicks
the chaos project - click me

vw54 Administrator Always Waiting 4 Friday

16,723 posts · joined Aug 2002 · 31 Aug 2005, 1:44 pm

#402872

The first thing the " MECHANIC " should have done isa compression check to see if all was equal. You carnt tune an engine if 1 cylinder is out of wack.

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

fekkinell Wolfsburg Wizard

655 posts · joined Jun 2005 · 31 Aug 2005, 5:25 pm

#402924

mmm... all sounds dodgy... i'll definitely take that pipe off and see what happens.

See i figured exactly that... if it was oil it would be oily, not sooty... but i'll check it and see what happens.

My girlfriends not happy with the place we've been going to, so we're gonna take both our cars somewhere else now.

The carburettors on my van were completely dismantled, cleaned, checked, and put back together.... it's doing a really annoying thing where it over revs... it feels like the throttle is stuck but when i check all the linkages they are exactly where they are supposed to be... yet when i rev it, sometimes it settles down, sometimes it doesnt. Seems completely random... it tends to lean more towards over revving and sometimes idles nicely.

Really starting to get on my nerves now cos it's using up all my precious petrol. 🙂nn[ Edited on 31-8-2005 by fekkinell ]

fekkinell Wolfsburg Wizard

655 posts · joined Jun 2005 · 1 Sep 2005, 12:13 pm

#403164

I took the van over the the guys at Volkspower in Burwood... problem solved in 10mins flat... a quick tune of the carburettors and a new return spring on the right hand carburettor as the old one had lost its springiness then sprung itself off entirely 🙂

Thanks for the advice people, was much appreciated 🙂