Author Topic: Timing and Vacuum Advance 101  (Read 3198 times)

Offline cncsparky

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  • Posts: 348
  • Member since: 2012
  • Year: 1988
  • Make: Sportscoach
  • Model: Cross Country
  • Chassis: Chevy
  • Engine: 454
Timing and Vacuum Advance 101
« on: June 10, 2014, 10:18 PM »

Offline circleD

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  • Posts: 494
  • Any day you wake up is a great day
  • Member since: 2013
  • I own: a Motor Home
  • Year: 1984
  • Make: Holiday Rambler
  • Model: Imperial 33
  • Chassis: p30
  • Engine: 454
Re: Timing and Vacuum Advance 101
« Reply #1 on: June 11, 2014, 09:14 PM »

Offline legomybago

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  • Posts: 1169
  • Member since: 2013
  • I own: a Motor Home
  • Year: 1975
  • Make: FMC
  • Model: 2900R
  • Engine: 440
Re: Timing and Vacuum Advance 101
« Reply #2 on: June 12, 2014, 09:29 AM »
Thats good write up, leans more towards direct manifold vacuum vs. ported. i've always used ported, it's what I know. My first FMC I purchased a couple years ago ran goofy...they had it all out of whack, the carb was toast to start with, the distributor was in 180* off, they had the dist. advance plugged into full manifold vacuum. Well, when you press down on the (dual hydravac) brake system, it takes a fair amount of vacuum out of that motor, and thus changes your idle condition. The engine timing retards so far it barely would run, so I changed it to what I've always known...ported vacuum, and it ran great. I believe there is a rhyme and a reason to both set ups though..
Never get crap happy with a slap happy pappy


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