Quote:
Originally Posted by Jooseppi Luna
LOL. Actually, you'd want to idle it for the maximum amount of vacuum...
|
This ain't no diesel mush (more's the pity). You get lower air pressure with more air / faster air flowing though the inlet manifold so you do need high RPMs. And even a piston vacuum pump to a point "makes more vacuum" as it pumps faster - the reason why you get reduced vacuum at higher engine speeds is due to a little valve.