Re: The Duchess Project: 1940 Super 8 Convertible Sedan

Posted by JWL On 2013/5/14 21:59:09
Quote:

JoeSantana wrote:
I found some fittings last night that might work to run the vacuum line from the manifold.

But by coming off the manifold, if there's vacuum on the advance at idle, wouldn't I have to adjust the distributor to compensate? I know how to do that, but just wondering. Or, at idle, the amount of vacuum is insufficient to move the arm?

I would like to do this because I could use the carburetor vacuum port to run the dashpot throttle guard.


Joe, the essence of the "Fix" is to provide more ignition advance at idle by having the distributor chamber connected directly to manifold vacuum.

The additional advance will cause the engine to idle faster; hence, the need to readjust the idle speed and mixture back to specified settings. After this adjustment, the engine will idle at specified RPM, but the vacuum advance will be full on.

Many cars of the 1960s and '70s used this method of connecting manifold vacuum directly to the distributor.

At idle you should be getting full vacuum from the manifold connection.

(o{}o)

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