<VV> timing changes at idle.

[Mark Durham]

Thanks Matt, Seth and Frank, you've given me some things to recheck
today, will get back to you.  Mark Durham

On Fri, Nov 11, 2011 at 6:46 AM, Frank DuVal <corvairduval at cox.net> wrote:
> As Matt says, make sure the vertical port you are using does not have
> any vacuum on it at idle. Turn down the idle speed screw on this carb to
> reduce the vacuum at idle.
>
> The vacuum advance trick you have read here is to use a hammer and deep
> socket to dimple the face of the VA unit, thereby increasing the spring
> pressure on the diaphragm. Another way to accomplish the same is to bend
> the tab on the other end, beside the actuating lever. Hard to describe
> in words, but have seen it demonstrated at club meetings.  This trick is
> to keep the advance from coming on too quickly.
>
> First fix the vacuum at the port.
>
> This is "ported" vacuum, which operates reverse of manifold vacuum. i.e.
> this port should be max vacuum at full throttle, and zero at idle. It is
> the vacuum above the throttle plate.
>
> Frank DuVal
>
> On 11/11/2011 12:25 AM, Mark Durham wrote:
>> Gents, I've read here about doing something to the distributer vacuum
>> advance to stop the advance from moving the timing at idle speed but
>> cannot remember what was done.
>>
>> Today I set my engine rpm to 600, adjusted the timing with the advance
>> hose off and plugged, reset the idle, rechecked the timing, then
>> hooked the hose up, and the engine accelerated as the advance moved
>> the plate a bit. What can I do to get the advance spring stiff enough
>> that the timing stays stable at idle and will come in later as I
>> advance RPM?
>>
>> Mark Durham
>>
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