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The hunt for more vacuum

Adding vacuum reservoir

About this Mopar:

Year
1968
Make
Dodge
Model
Charger R/T
Working the problem of border line vacuum for the dual diaphragm booster. My cam shaft is a 110 LSA Bullett, [email protected], 576 lift w/ 1.6 ratio. and at idle I'm pulling just a tick over 17" with the car in park and no load on the engine. As soon as I drop it in gear the vacuum drops to 15.7". So following kern dogs plight with hydro boost I thought I'd try a less technical approach. What I've done is relocated the vacuum port from under the throttle blades and moved it 3/4 of the way down #7 runner like the OEM locations. Then I added a vacuum reservoir to see if I could find a better brake feel. So far it seems to work however I haven't taken the car out for a real-world test but this is showing promise and only kicked the crap outta 50 bucks. Anyone tried this before?
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Latest updates

Well the search continues. Adding the vacuum accumulator did in fact help with my low vacuum issue but the lift and lobe separation isn't vacuum friendly plus it gives my EFI fits. The brakes did work much better upon the initial peddle jab but if you had to go back to the brakes immediately the peddle became hard again until the vacuum signal came back up. Being an ex-racer there was a couple of things that were most important, fire suit and solid brakes. Going to divorce the brake system and going to a hydro boost set up.... stay tuned.

Comments

The hydro boost should help or an electric style unit could too
seen a few installed, never did one on mine "yet"
I know all to well the aggressive cam & lack of vacuum with power brakes
my last few cars have been manual brakes, converted to discs, so not dealing with it
but I do remember it well...

good luck
 

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FBBO Member Photo Garage
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68Moparmaniac
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