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Author Topic: Disdabling deceleration valve and vacuum retard on 71 2.0 motor  (Read 2546 times)

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Offline Reed

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Disdabling deceleration valve and vacuum retard on 71 2.0 motor
« on: October 02, 2008, 02:39:52 PM »
Hey gang.  I havre been driving my 71 Pinto more lately and i am not happy with the performance and gas mileage it is getting.  Mileage seems to be about 20-25 MPG mixed highway/city driving, and it seems to have a lag on acceleration.

Right now the motor is bone stock.  I would like to disable the deceleration valve and the vacuum retard on the distributor.  Can i just disconnect the hose going to the vacuum retard pod on the dist?  How do I remove/disable the deceleration valve? 

Thanks!
Looking for:  Rear and side window louvers for a 71 sedan, 15 inch aluminum slotted mags and tires (Ansen sprint style), and an Offenhauser dual-port intake for a 2000cc motor.

Offline Srt

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Re: Disdabling deceleration valve and vacuum retard on 71 2.0 motor
« Reply #1 on: October 03, 2008, 04:03:27 AM »
take the 'decel' (deceleration valve) valve off at the intake manifold, tap the hole into the decel valve to (IIRC) 3/8 pipe insert a socket head (allen head) plug flush and reinstall the decel valve.  eliminates a potential vacuum leak and helps the engine rpm settle back down to idle after acceleration and between shifts
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Offline map351

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Re: Disdabling deceleration valve and vacuum retard on 71 2.0 motor
« Reply #2 on: October 03, 2008, 07:02:04 AM »
Take the valve off put a penny under the valve bolt it back together, it's fixed..
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Offline Reed

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Re: Disdabling deceleration valve and vacuum retard on 71 2.0 motor
« Reply #3 on: October 03, 2008, 01:34:08 PM »
Hey, thanks!  How about the vacuum retard on the distributor?  If I just disconnect it from the diaphragm and plug the line will the vacuum advancecome in too quickly?
Looking for:  Rear and side window louvers for a 71 sedan, 15 inch aluminum slotted mags and tires (Ansen sprint style), and an Offenhauser dual-port intake for a 2000cc motor.

Offline 71pintoracer

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Re: Disdabling deceleration valve and vacuum retard on 71 2.0 motor
« Reply #4 on: October 03, 2008, 09:28:27 PM »
IIRC the retard side was for emission control, it won't affect the advance side. Take the hose off and put a BB or a ball bearing in it and hook it back up.
If you don't have time to do it right, when will you have time to do it over?

Offline Reed

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Re: Disdabling deceleration valve and vacuum retard on 71 2.0 motor
« Reply #5 on: October 03, 2008, 09:49:43 PM »
Thanks!  I will disconnect it and cap the fitting on the intake with a nipple, but use the fitting later for a vacuum guage.   ;D
Looking for:  Rear and side window louvers for a 71 sedan, 15 inch aluminum slotted mags and tires (Ansen sprint style), and an Offenhauser dual-port intake for a 2000cc motor.

Offline pintoman2.0

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Re: Disdabling deceleration valve and vacuum retard on 71 2.0 motor
« Reply #6 on: October 04, 2008, 12:29:40 AM »
Hey Reed,

Do you have the vacuum hooked to manifold or ported. It makes a difference because the ported has 0 in/hg at idle or cruise. It only has vac under acceleration. I talked to apintonut tonight and I guess my cutting party is off. You can still come over if you want, find out where I live and what I've got.

P

Offline Reed

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Re: Disdabling deceleration valve and vacuum retard on 71 2.0 motor
« Reply #7 on: October 04, 2008, 10:26:06 AM »
Thanks for the invite but I am slammed with work this weekend.  I won't be able to make it out.

The vacuum advance pod is hooked to a ported source on the carb but the vacuum retard pod is hooked straight to manifold vacuum.  I haven't had much time to investigate it, but I want to get out there and pot the timing curve and see exactly at what vacuum the advance pod kicks in and also how fast it advances.  I am worried that if i just disconnect the retard pod the advance pod will come in too early and too fast.  But I need to go out and actually test it.

Thanks!
Looking for:  Rear and side window louvers for a 71 sedan, 15 inch aluminum slotted mags and tires (Ansen sprint style), and an Offenhauser dual-port intake for a 2000cc motor.