65 289 Vacume Advance issue

Rolfey · May 25th, 2008, 01:47 AM

According to the manual the engine is suppose to run at about 10 degrees advanced however my engine runs at about 20. When we disengage the vacume advance and plug it, the engine correctly sits at 10 degrees however refuses to idle. Any ideas?

Thanks

MustangOne · May 25th, 2008, 10:06 AM

Sounds Like you have Valcuum Leaks Some were. Check Carb Base and all vacuum Ports.

On your timing issues your advance was working correct. you just dont start a 10 Deg you start close to TDC = Top Dead center, Then when it start running the advance moves the timing to 10 Deg.

Good Luck

65 B/FX · May 26th, 2008, 06:51 PM

Thats incorrect actually for a stock set-up (unilite). Ive been working on SBF for 30 years and this is a common misconception. There is no vacuum in the line from Advance unit to Carb at idle. The initial degree should be 10 or so like you said, and a total of around 30 or so. It does sound like you have a leak either in your advance unit itself, or the line/connections to-from the unit. It sounds like the diaphram in the adv canister may be split. Try a new one and see. Is your vacuum line hooked up to the correct vacuum port on the carb? That could be as well. Again, there should be no vacuum at idle, so use that port on the carb. Hope this helps.

May 25th, 2008, 01:47 AM	#1
Rolfey Newbie Join Date: Oct 2006 Posts: 5	65 289 Vacume Advance issue According to the manual the engine is suppose to run at about 10 degrees advanced however my engine runs at about 20. When we disengage the vacume advance and plug it, the engine correctly sits at 10 degrees however refuses to idle. Any ideas? Thanks

May 25th, 2008, 10:06 AM	#2
MustangOne Regular 1968 GT 500 Super Snake 12.6 @ 114.3 Join Date: Mar 2008 Location: Sapulpa Oklahoma Posts: 335	Sounds Like you have Valcuum Leaks Some were. Check Carb Base and all vacuum Ports. On your timing issues your advance was working correct. you just dont start a 10 Deg you start close to TDC = Top Dead center, Then when it start running the advance moves the timing to 10 Deg. Good Luck __________________ www.Mustang1.Com

May 26th, 2008, 06:51 PM	#3
65 B/FX Regular Join Date: Mar 2007 Location: Orange County, CA Posts: 53	Thats incorrect actually for a stock set-up (unilite). Ive been working on SBF for 30 years and this is a common misconception. There is no vacuum in the line from Advance unit to Carb at idle. The initial degree should be 10 or so like you said, and a total of around 30 or so. It does sound like you have a leak either in your advance unit itself, or the line/connections to-from the unit. It sounds like the diaphram in the adv canister may be split. Try a new one and see. Is your vacuum line hooked up to the correct vacuum port on the carb? That could be as well. Again, there should be no vacuum at idle, so use that port on the carb. Hope this helps. __________________ 1964 Falcon Sprint 4 speed 1965 347 Cyclone 4 speed, B/FX clone 1993 Mustang Cobra (red/grey cloth)

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