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newbie question-OSAC valve #730770
December 15th 2017 9:52 am
December 15th 2017 9:52 am
Joined: Dec 2017
Posts: 12
nebraska
J
jason159 Offline OP
stranger
jason159  Offline OP
stranger
J
Joined: Dec 2017
Posts: 12
nebraska
Hi fella's. New vanner here. Is the OSAC valve necessary on my 1975 Dodge B100 w/318, or can I run it straight to ported vaccum? Does it affect the throttle operation? It seems it's a 50 dollar part. What do you guys think? Thank you! -Jason

Re: newbie question-OSAC valve [Re: jason159] #730771
December 15th 2017 10:35 am
December 15th 2017 10:35 am
Joined: Sep 2005
Posts: 8,194
Georgia, USA
CatFish Offline
carpal tunnel
CatFish  Offline
carpal tunnel
Joined: Sep 2005
Posts: 8,194
Georgia, USA
To paraphase a Mopar expert from another forum:

The OSAC delays vacuum to the distributor vacuum advance pod by 7 to 17 seconds (depending on the exact valve in your vehicle). It was designed with one purpose in mind: To get the vehicle configuration past the ludicrously unrealistic Federal Emission Compliance Certification tests. Removing it allows the vacuum advance to work normally, which greatly improves driveability and mileage with zero negative side effects, and even if you have to pass an emission test of some description, you'll still pass just fine without the OSAC valve.
(SlantSixSam)

Last edited by CatFish; December 15th 2017 11:04 am. Reason: credit due


“The true soldier fights not because he hates what is in front of him, but because he loves what is behind him.”
Re: newbie question-OSAC valve [Re: jason159] #730783
December 15th 2017 2:42 pm
December 15th 2017 2:42 pm
Joined: Dec 2017
Posts: 12
nebraska
J
jason159 Offline OP
stranger
jason159  Offline OP
stranger
J
Joined: Dec 2017
Posts: 12
nebraska
sounds great to me, thank you CatFish!


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