running lean

bigdood2 Casual Dubber

22 posts · joined Mar 2008 · 27 Jun 2008, 8:56 pm

#654318

Hi Guys,
I need some expert opinions.
Can anyone tell me exactly what the bypass and volume screws do on a standard 75L Bug carby,I want to try running a bit leaner to get better fuel economy,I've followed the manual but it does'nt actually say if clockwise is leaner or richer,and inside the tailpipes looks a bit black(rich) .
Also can running leaner do damage?
Go roosters !!!!!!!

Bizarre Moderator The artist formerly known as blue74l

12,789 posts · joined Aug 2002 · 27 Jun 2008, 9:14 pm

#654323

yes - running lean can be bad.
Lean = hot = damage

Regardless

in is lean
out richens

you should have a 34 Pict 3 carb onyour car
tune by this procedure
http://www.vw-resource.com/34pict3.html

If you are really keen - get your car dyno'd or at least get an analyzer put on your tail pipe

Futue te ipsum!!!

donn Wolfsburg Elder

3,515 posts · joined Nov 2005 · 28 Jun 2008, 12:00 am

#654355

Best economy is tuned spot on, not lean, not rich. If the motor is tuned to its optimum then it is giving the most power available from a given measure of fuel, least thats the way I see it.

I dream of a day when a chicken can cross a road without being asked for it's motive!

ancientbugger Custom Title Time!

1,986 posts · joined Mar 2004 · 28 Jun 2008, 8:03 am

#654371

Also I don't think the colour of the exhaust pipes makes much difference since leaded fuel went out of the window.