[T3] FI Dizzy for Carbs

[Jonathan Stiles]

Adam,

The correct distributor for you setup is a "231 170 034" from a '74 federal
Beetle. This is the distributor all aftermarket SVDA dizzys are built on.
It's not that the dizzy you have won't work, but it is not the correct one
so it won't function within its design. The vacuum advance curve
doesn't match the cam pulse profile for a dual port engine running dual
DRLA's. I have tried other combinations but it never worked right or
without a lot of fiddling around.

My own personal VW runs dual 36mm Dells with a "034" dizzy with no
hesitation or idle issues. I have installed this combination on a half
dozen client cars with excellent results.

The "034" times at 7.5 degrees BTDC at 850-900 RPM with the vacuum hose
detached and plugged.

Hope this helps.

Jon Stiles
Denver, CO

On Saturday, June 7, 2014, Craigs List <craigslistcsprings at gmail.com> wrote:

> I'm back.......
>
> Mr Welton and I were discussing distributors last night. As of yesterday I
> got the new Dell 36's going on my squareback. Although they run better,I
> still have the stumble off of the line and a stumble at low rpm
> accreditation.
>
> When looking at the numbers on my dizzy I finally realized that I have a fi
> svda distributor. (Thanks Max) I was wondering what the differences between
> the fi distributor and a dizzy for carbs are? Is the curve different? Would
> funding a distributor designed for carbs help a lot, a little or would it
> be a waste of time?
>
> My current distributor is a 311 905 205 L. The charts say this is a svda
> off of a 1969 fi type 3. Through the recommendation of Mr. Welton, I gave
> it a little timing yesterday and this indeed helped.  I was short of time,
> so I just gave it a 1/4" counter clockwise turn to see what would happen.
> Today or tomorrow I am going to break out the gun and see where I am
> exactly. Timing instructions for this one are 0* at idle with the vacuum
> can capped.
>
> Any more pointers from you guys would be greatly appreciated.
>
> Adam
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