RE: [T3] Dual Carburetors (fwd from C. Dilday)

[oofacts@earthlink.net]

>well, the car is 72. The engine I'm not sure. I thought that's what the
>number would tell you. The transmission is manual.
>>Ugh.  That means the timing marks are different from mine, and the
>>Bentley's vague on which is 0.  If you've got a factory sticker on the
>>fan showing which mark is 0, you should go by that.  Knowing what year
>>the engine isn't as important as knowing what year the fan is from so you
>>know how to read the timing marks.
>
>>and the VW # is 021-905-205S, you should get a
>>different distributor.
>It only has vacuum advance (1 hose), I've been told about the advance
>before.
>>Nevertheless if it's that part number, it's about as wrong a distributor
>>as you can get.  If you're getting all the advance this distributor is
>>capable of, you will do serious mechanical harm to your engine if you
>>continue to use it.
>
>I have to get a timing light. How can you tell when the distributor
>isn't advancing well?
>>The only way to check your advance is with a timing light.  Every
>>distributor has specs, and should advance to a certain point at a certain
>>rpm.  Say the distributor you have has a spec of 20 degrees advance at
>>1800 rpm.  With the timing set correctly at idle, you connect the tach,
>>run the engine at 1800, it should be at 20.  You can only do this with a
>>strobe light.  Also, look at the mark.  It should be fairly steady and
>>not jumping around.  A jumpy timing mark could mean that you've got
>>incorrect vacuum, or the distributor shaft is worn and moving about, or
>>it the weight advance mechanism in the distributor body is gakked up with
>>crud and needs to be cleaned out and re-oiled.
>
>>run up the motor till the distributor stops advancing
>How do you know when it stops advancing?
>>Well, the timing gun will strobe every time #1 fires, creating a still
>>shot of the timing marks on the fan.  When the timing advances, the marks
>>appear to move to the left.  When they've moved to the left as far as
>>they will go, then you've stopped advancing.
>
>BTW I'm forwarding all this stuff to the link because I haven't been able
>to find anything about dual carbs in the archive, and I think it's
>important for people like us to have some sort of reference.
>>I've never found any documentation AT ALL about syncing Dual 34ict's, jet
>>sizes, and other tuning information.  This is just what I've learned from
>>personal experience and talking to people.  If somebody out there knows
>>where I could get my hands on anything official/correct, I'd sure like to
>>know about it.
>
>Curt
>


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