The Ford Barn

DD931 · 10-08-2016, 03:10 PM

I'm rebuilding a distributor for my '48 F-1 with an "H" engine which uses a Loadomatic distributor. I'm ready to run it on my Allen Synchrograph and want to adjust/check the breaker plate springs. The Ford Shop Manual to apply 0.26 inches of vacuum and adjust the light spring to result in 1 3/4 degrees advancement at 400 RPM and the heavy spring at 1.4 inches of vacuum for 6 1/4 degrees of advancement at 1000 RPM.

My problem: I can't read these small/low levels of vacuum with a regular vacuum gage that ranges from 0 to 25+ inches. I'm looking for suggestions on how to proceed. Am I looking at this wrong somehow? Bubba - are you there?

BUBBAS IGNITION · 10-08-2016, 03:24 PM

Just use the low vacuum and adjust eccentric pin to get approx 2 degrees and then 1.5-2 vacuum to get the 6-7 degrees . that will give you approx 18 degrees of vac advance.....close enough...........

DD931 · 10-08-2016, 06:22 PM

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That's sort of what I figured, but having expert advice makes all the difference!! Thanks!!

10-08-2016, 03:10 PM	#1
DD931 Senior Member Join Date: May 2010 Location: PA Poconos Posts: 723	Loadomatic spring adjustment I'm rebuilding a distributor for my '48 F-1 with an "H" engine which uses a Loadomatic distributor. I'm ready to run it on my Allen Synchrograph and want to adjust/check the breaker plate springs. The Ford Shop Manual to apply 0.26 inches of vacuum and adjust the light spring to result in 1 3/4 degrees advancement at 400 RPM and the heavy spring at 1.4 inches of vacuum for 6 1/4 degrees of advancement at 1000 RPM. My problem: I can't read these small/low levels of vacuum with a regular vacuum gage that ranges from 0 to 25+ inches. I'm looking for suggestions on how to proceed. Am I looking at this wrong somehow? Bubba - are you there?

10-08-2016, 03:24 PM	#2
BUBBAS IGNITION Senior Member Join Date: May 2010 Location: SPEEDWAY INDIANA Posts: 4,148	Re: Loadomatic spring adjustment Just use the low vacuum and adjust eccentric pin to get approx 2 degrees and then 1.5-2 vacuum to get the 6-7 degrees . that will give you approx 18 degrees of vac advance.....close enough........... __________________ If it Makes Spark, we do it !!!! www.bubbasignition.com [email protected]

10-08-2016, 06:22 PM	#3
DD931 Senior Member Join Date: May 2010 Location: PA Poconos Posts: 723	Re: Loadomatic spring adjustment Sponsored Links (Register now to hide all advertisements) That's sort of what I figured, but having expert advice makes all the difference!! Thanks!!