Distributor Guru's
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Cargo Master
Joined: Sep 2005
Posts: 2,954
Likes: 64
Distributor Guru's
I am going to change my 74 F-350 390 over to Durospark in my quest for reliability and mpg's, I have a choice of single or dual diaphram stock distributors. What are the advantages and disadvantages of both?
Lead Driver
Joined: Jan 2003
Posts: 9,893
Likes: 12
From: Ohio
I've always wondered about those dual diaphram dizzy's?
Heck none of my stuff has any hooked up at all. Two of them have stock dizzy's installed, but I unhooked the vacuum advance and it runs great. I set total timing and let it go, just like my Mallory mech adv. dizzy's.
Heck none of my stuff has any hooked up at all. Two of them have stock dizzy's installed, but I unhooked the vacuum advance and it runs great. I set total timing and let it go, just like my Mallory mech adv. dizzy's.
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
Likes: 423
From: Long Island USA
A somewhat un-informed opinion:
Those dual diaphragm vacuum advances are mainly for emissions to pull the timing at some point to lower an emission...
Use a single...
As to the Duraspark, you might be better off just getting a Pertronix unit (or whatever other brand is out that everyone likes)... it fits into your stock distributor, no wiring hassles, nothing.
You might want to consider a higher-voltage coil if the Pertronix can handle it.
art k.
Those dual diaphragm vacuum advances are mainly for emissions to pull the timing at some point to lower an emission...
Use a single...
As to the Duraspark, you might be better off just getting a Pertronix unit (or whatever other brand is out that everyone likes)... it fits into your stock distributor, no wiring hassles, nothing.
You might want to consider a higher-voltage coil if the Pertronix can handle it.
art k.
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