Quote:
Originally Posted by davedew
If you only draw from one header it will only see manifold pressure when that cylinder is on the intake stroke. You will get a pulsing effect on the dizzy and inconsistant timing advance. That is why you need to draw from all four headers.
If you connect all four into a small container, then connect that to the dizzy you will get a steady vacuum flow
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never been an issue for any of the xflows,pintos, lotus twincam and one vauxhal 8v i have worked on with conventional dizzys and webber 40's or alike with vac advance.
the lotus engine was setup like it as a production car and i think thay knew what thay where doing.
only things that dont like seeing a single cyl vac is map sensors as far as i know
i dont expect a dizzy vac diaphram will react that quick