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Username Post: Vacuum Advance- how is it supposed to work?
Jim_Elliott 
Senior Member
Posts: 250

Loc: La Quinta Calif
Reg: 11-06-01
04-07-10 03:39 PM - Post#1894533    
    In response to IgnitionMan

Thank you Dave, Yes I still read the site and pickup tidbits of information...
I made a test long ago on the EGR valve right before my 87 motor home (454) was sold so here is what was discovered.....
On long pulls my vacuum was 6 inches on the westbound climb out of the Coachella valley (Palm Springs).
With the vacuum hose disconected & plugged at the EGR the next pull was 8 inches of vacuum so I left it disconected from that time on.....
Better vacumm on the flat lands was also noted cruising down the super slab from (12-14 inches to 14 to 17 inches) which of course means mo'power along with better fuel mileage.
Of course your mechanical distributor settings (375 & 41 weights) were in play prior which are perfect....
When I sold the 87 RV I think the EGR vacuum was never reinstalled

Jim
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