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Timing with vacuum advance #1192953 03/07/12 06:27 PM 03/07/12 06:27 PM
Joined: May 2011 Posts: 340 Alaska 7 73rrak OP enthusiast
73rrak OP enthusiast 7 Joined: May 2011 Posts: 340 Alaska	I'm new to tuning with vacuum advance and I have a few questions. I shortened my mechanical advance slots to .375. I set my initial to 16 (vacuum unplugged) and get a total of 32 ( vacuum unplugged). When I connect the vacuum advance my initial goes to about 20 and my total goes to about 40. I haven't driven it yet but it idles pretty good with the vacuum unplugged and idles like crap with the vacuum plugged in. Does anybody have any info to post that would help me or feel like taking the time to walk me thru this ?

Re: Timing with vacuum advance [Re: 73rrak] #1192954 03/07/12 06:32 PM 03/07/12 06:32 PM
Joined: Jan 2003 Posts: 17,861 albany ny 0 05dakota I Live Here
05dakota I Live Here 0 Joined: Jan 2003 Posts: 17,861 albany ny	hooked to wrong port

Re: Timing with vacuum advance [Re: 73rrak] #1192955 03/07/12 06:32 PM 03/07/12 06:32 PM
Joined: Mar 2007 Posts: 3,285 West Coast, USA jbc426 master
jbc426 master Joined: Mar 2007 Posts: 3,285 West Coast, USA	Sounds like you're plugging it in to manifold vacuum. Try ported vacuum instead. 1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's 1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)

Re: Timing with vacuum advance [Re: jbc426] #1192956 03/07/12 06:37 PM 03/07/12 06:37 PM
Joined: May 2011 Posts: 340 Alaska 7 73rrak OP enthusiast
73rrak OP enthusiast 7 Joined: May 2011 Posts: 340 Alaska	It's connected to the passenger side of the front metering block of my 800 Holley. Is this right or wrong ?

Re: Timing with vacuum advance [Re: 73rrak] #1192957 03/07/12 07:27 PM 03/07/12 07:27 PM
Joined: Jan 2003 Posts: 17,861 albany ny 0 05dakota I Live Here
05dakota I Live Here 0 Joined: Jan 2003 Posts: 17,861 albany ny	DOES IT HAVE VACCUM AT IDLE?

Re: Timing with vacuum advance [Re: 73rrak] #1192958 03/07/12 08:19 PM 03/07/12 08:19 PM
Joined: Nov 2011 Posts: 2,154 Its a TRAP! DARTH V8Я Oh No!! I just had a moron attack!
DARTH V8Я Oh No!! I just had a moron attack! Joined: Nov 2011 Posts: 2,154 Its a TRAP!	Quote: It's connected to the passenger side of the front metering block of my 800 Holley. Is this right or wrong ? Depending on the metering block, sometimes it ported vacuume, sometimes not. As suggested, just start the engine let it idle and see if theres suction at the port. If there is, maybe another source somewhere on the carb. When it takes more than a sweet mullet to prove you rule at the trailer park..

Re: Timing with vacuum advance [Re: DARTH V8Я] #1192959 03/07/12 10:03 PM 03/07/12 10:03 PM
Joined: May 2011 Posts: 340 Alaska 7 73rrak OP enthusiast
73rrak OP enthusiast 7 Joined: May 2011 Posts: 340 Alaska	It does have vacuum at idle and it's the only port it has on the carb besides the ones on the base plate. I disconnected the vacuum advance and drove it and it runs great so I think I will just leave it disconnected for now. I put up another post about my coil terminal smoking almost sounds like I'm still chasing gremlins.

Re: Timing with vacuum advance [Re: 73rrak] #1192960 03/07/12 10:24 PM 03/07/12 10:24 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	there's gotta be a ported nipple on there somewhere. that or the throttle plate is opened to far @idle live every 24 hour block of time like it's your last day on earth

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