Re: How to use vacuum gauge for FE?
My Buick is meant to be connected to two vacuum sources, through a modulator device. This guy:
https://www.corvetteactioncenter.com/...m-advance.html makes a great case for connecting it directly to manifold vacuum. |
Re: How to use vacuum gauge for FE?
thc, that's a really interesting article.
I know nothing about American cars, so I have to accept that this guy knows what he's talking about. The big plus here, is that it's an easy mod to make - and easily changed back if it isn't to your liking (that is a performance orientated site and they have different objectives than we do). Good luck, Pete.:thumbup: |
Re: How to use vacuum gauge for FE?
My vote is for manifold vacuum advance for fuel economy. The 85-87 Honda CRX HF's were carbed and all used manifold vacuum for advance.
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Re: How to use vacuum gauge for FE?
I'm going to try both the one that I think is ported vacuum (which was previously one of the two simultaneously in use for it) and good manifold vacuum.
I may do some A-B-A if they both drive well but I suspect that ported is going to run badly. |
Re: How to use vacuum gauge for FE?
I might be new here, but I have run Vac gauges for years, on my bikes, and muscle cars. The vac gauge needs to be on the manifold, below the butterfly to get the right readings. I know my old 67 Pontiac would idle @ 17, and as soon as you get into it, it would drop. Whether injected or Carbed, it will do the same thing.
Now with your car, it sound like the is a check valve or diaphram where you have it hooked up no. You need to have it hooked direct to the manifold to get the right readings. I use them on my Motorcycles, to make sure the carbs were Sync'ed. Good luck The FNG |
Re: How to use vacuum gauge for FE?
Good news, everyone!
I moved the distributor advance to ported vacuum and the vacuum gauge to manifold vacuum (as reported in more detail in my spark plug thread). Now: - the vacuum gauge works right :) - idle is partially better (down to 1000RPM) :D - no spark knock! :D My driving style was pretty close to good. I need to go easier immediately after shifting gears, and there's a couple hills I maybe should climb in a lower gear. |
Re: How to use vacuum gauge for FE?
Yahoo!
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Re: How to use vacuum gauge for FE?
Quote:
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Re: How to use vacuum gauge for FE?
Congratulations!
I suppose I'll have to add this to my "must try" list.;) |
Re: How to use vacuum gauge for FE?
Quote:
Turns out there's also a lot of times when the engine is struggling and bogging and vacuum is marginal, but downshifting makes vacuum drop even more...you gotta really lay into it to get this engine to higher RPM. |
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