EGR/Smog removal and subequent ignition timing

[SnowySeal]

Hi

I have 1974 californian T2 Bay, 1800cc, twin carbs.

Engine no. is AW017287 and the engine decal says timing is 10 deg. ATDC (after TDC)

I have removed the entire EGR/Smog setup and blocked all the ports.

I have replaced the 009 mechanical distributor with a 034 centrifugal and vacuum advance electronic one.

My question - is the 10 deg. ATDC setting still relevant? How can I tell ?
I assume this is at idle (900 rpm) and no vacuum advance ?

Many thanks!

Ian

[Randy in Maine]

Is one of the carbs tapped to provide for the correct ported vacuum signature for the SVDA distributor? That needs to happen. I would plug the carbs "retard" port if it has one.

It will still get timed to 30º +/- 2º (vacuum hoses off and plugged) at about 3500 RPMs of whenever all of the centrifical advance the distributor has to offer is all in.

I would start at about 28º myself.

[SGKent]

You would only use the retard if your carb(s) were set up to offer a retard signal and that is unlikely. You would leave that side disconnected and only use the advance side after opening a ported vacuum source on the carb. Even so it won't work quite as well as with the carb it was designed to work with - but you will be happy with it.
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[wcfvw69]

Tell us which dual carbs you have. Many of the dual Webers do not provide enough vacuum for an SVDA vacuum canister. They need a minimum of 200mm hg. to pull the advance fully.
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[SnowySeal]

Excellent, thanks guys.

I have the Solex 34 PDSIT 2/3 carbs, and the advance vacuum pipe connected to an open port on the left hand carb.

The 30 deg. advance at 3500 RPM - that is obv. before TDC. What would be sensible at 900 RPM idle?

Thanks

[Randy in Maine]

Note but do not change it initial timing at correct idle speed of 850RPMs +/- 50.

It should be somewhat close to about 7.5º BTDC.

[busdaddy]