svda? dissy about the choice

waltermitty Legend when my beer goggles are on

1,993 posts · joined Aug 2002 · 20 Sep 2004, 7:42 pm

#235360

I am running dual webbers so no vac ports. I haved heard that drilling vac ports in the webbers and using a svda dissy is the best solution? avoiding all the 009 issues, what do you think? is the way to go?
Seems as though choosing the correct Dissy is nearly as difficult as choosing the right cam. Thanks in advance
Mitchell

23 windows ...8 too many!

Bizarre Moderator The artist formerly known as blue74l

12,789 posts · joined Aug 2002 · 20 Sep 2004, 7:51 pm

#235369

Mitch read here

http://www.aircooled.net/gnrlsite/resource/articles/distributor.htm

A Mallory MSD is the best for Webers.

You can drill Kads but i have not heard for Webers.

I would not bother. Go the 009

Futue te ipsum!!!

56astro Custom Title Time!

1,772 posts · joined Aug 2002 · 20 Sep 2004, 7:56 pm

#235373

waltermitty wrote:I haved heard that drilling vac ports in the webbers and using a svda dissy is the best solution? avoiding all the 009 issues, what do you think? is the way to go?
Mitchell

Mitch,

In a properly tuned engine there are no "009 issues". Get someone that can tune/jet the carbs and tune the engine and you wont have any issues.

Ask Craig Torrens if he has "009 issues"

Steve

VW car, VW engine ...... keepin it "real"
35MPG on 101.3kPa

70AutoStik Insano Dub Head

730 posts · joined Aug 2002 · 23 Sep 2004, 12:50 am

#236390

You're on the right track, but you'd be better off finding someone with a bit of experience to modify your Webers for you. You won't need vac advance at all, of course, if it's a quarter-miler - but it will make a big difference to your fuel economy and throttle response if you drive on the street.

From memory, a 0.4-0.6mm hole placed vertically half-way between the second and third progression holes (the first is the lowest one, of course,) but horizontally displaced at least 1mm will provide the correct vacuum signal. If your cam is fairly wild or you are over-carbed, drill all four ports and join them for one signal... The vacuum hose itself will smooth the signal out a bit.