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#950405 - 03/13/11 09:50 PM Bypass emissions system in a 73 duster slant 6
firtdog Offline
member

Registered: 11/20/10
Posts: 38
Loc: Dallas, Oregon USA
Has anyone bypassed the emissions system in a 73 Duster? How do you do it? What hose matter? Which ones don't? Pics would be great.

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#950406 - 03/13/11 09:57 PM Re: Bypass emissions system in a 73 duster slant 6 [Re: firtdog]
RapidRobert Offline
Circle Track

Registered: 11/20/03
Posts: 34032
Loc: Lincoln Nebraska
'73 was one of the worst if not the worst year ever for emission controls. Dont remem all that they had but for starters I'd run ported vac directly to the dist then rework all of the dist subsystems in order; initial/total/springs/vac adv and carter AFB or edelbrock pri jets from a strip kit will interchange/fit on carter 2bbls so you can jet up (pick a strip kit w dia's close to what you have in your current '73 carb). They tended to have retarded cam/tim sets also
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#950407 - 03/13/11 11:36 PM Re: Bypass emissions system in a 73 duster slant 6 [Re: RapidRobert]
west Offline
master

Registered: 04/06/07
Posts: 4233
Loc: petaluma,ca. u.s.a.
got a v-8? no smog
get an eddy manifold and holly carb and dump all the other garbage

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#950408 - 03/14/11 12:55 AM Re: Bypass emissions system in a 73 duster slant 6 [Re: west]
Yancy Derringer Offline
mopar

Registered: 10/20/10
Posts: 606
Loc: Montana
The question is CAN you? I see you evidently live in Oregon, do you not have smog checks for registration, or is it exempt?

The biggest problem is

The stock distributor advance curve is screwed up

(I don't remember it MAY have thermostatic control in the vacuum advance)

The stock carb is way too lean

and EGR

The fuel tank/ carbon canister stuff generally doesn't hurt a thing.

I'd unhook the EGR, or plug the valve, richen up the carb, and play with the spark advance and look for a control valve in the vacuum line between distributor and carb.

I don't remember the details on these. Single BIGest problem is the carbs were way too lean

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#950409 - 03/14/11 01:10 AM Re: Bypass emissions system in a 73 duster slant 6 [Re: Yancy Derringer]
Frankenduster Offline
Moparts proctologist

Registered: 02/15/10
Posts: 15375
Loc: Granite Bay CA
In California, the 1975 and OLDER cars are exempt from testing, but are still required by law to retain the factory emissions equipment. Nobody checks, so most people think its a moot point.

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#950410 - 03/14/11 06:42 AM Re: Bypass emissions system in a 73 duster slant 6 [Re: Frankenduster]
jbc426 Offline
master

Registered: 03/01/07
Posts: 2776
Loc: West Coast, USA
Quote:

In California, the 1975 and OLDER cars are exempt from testing, but are still required by law to retain the factory emissions equipment. Nobody checks, so most people think its a moot point.




...for now. The tree huggers are working to change that as we speak.
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1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 3.73s
1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 3.91's (closest thing to an automatic 5 speed going)

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#950411 - 03/14/11 12:32 PM Re: Bypass emissions system in a 73 duster slant 6 [Re: jbc426]
ghostrider Offline
enthusiast

Registered: 12/10/06
Posts: 377
Loc: Riverside, California
Quote:

Quote:

In California, the 1975 and OLDER cars are exempt from testing, but are still required by law to retain the factory emissions equipment. Nobody checks, so most people think its a moot point.




...for now. The tree huggers are working to change that as we speak.




Federal law requires all factory smog equipment to be on the car and functioning but they leave it to the states to enforce.
Tree huggers in CA need to be forced to live with NO post 1800 conveniences or pay the state a huge fee to submit their 'lawsuits for the environment' to the courts. They misrepresent their true objectives to the public (in my opinion) in order to get members paying dues.
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Must remember... my humor doesn't work on forums.....my humor doesn't work on forums. Former Mopars include 69 Super Bee, 71 Sebring, 68 Charger, 69 Charger, 78 D150, 67 300, 71 Road Runner clone, 79 T-top Doba, 67 Barracuda, 91 TC by Maserati, 68 Town & Country

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