Current Classifieds

78-80 Windshield
Date: 10/29/2021 03:11 pm
71-71 speedo cable
Date: 07/31/2021 09:04 pm
Rear brake shoes

Date: 01/23/2017 05:01 pm
Wanted 73 pinto squire wagon
Date: 05/09/2020 11:59 am
1974 Pinto Inside Rear View Mirror & Brake Pedal Pad

Date: 02/18/2017 04:41 pm
Looking for a Single Stage Nitrous Kit/ 2-bbl Holley Spray Bar Plate
Date: 01/06/2017 11:42 pm
Wanted Postal Pinto
Date: 09/26/2019 05:31 pm
Need Brakes for 1971 Pinto
Date: 04/27/2018 11:48 pm
Pinto 4-spd transmissions
Date: 06/15/2018 09:15 am
78 pinto wagon

Date: 06/04/2020 12:42 pm
Need Interior Panels
Date: 07/09/2018 04:59 pm
Looking for front seats
Date: 08/10/2021 09:54 pm

Author Topic: Ignition Timing Question  (Read 297 times)

0 Members and 1 Guest are viewing this topic.

Offline WTodd6

  • Pinto Driver
  • *
  • Posts: 2
  • FeedBack: +0/-0
  • Another Pinto Driver

  • Total Badges: 2
    Badges: (View All)
    Topic Starter Mobile User
Ignition Timing Question
« on: August 18, 2020, 08:49:42 AM »
Why did ignition timing go from 6 degrees tdc to 20 degrees tdc on 2300 with auto trans from 1975 to 1976?

Offline Wittsend

  • Pinto Master
  • *****
  • Posts: 2409
  • FeedBack: +241/-0

  • Total Badges: 8
    Badges: (View All)
    Tenth year Anniversary Mobile User Topic Starter Poll Voter 1000 Posts Linux User Windows User Fifth year Anniversary
Re: Ignition Timing Question
« Reply #1 on: August 18, 2020, 11:49:09 AM »
Exactly why, I don't know. But a fair guess is that it either had to do with smog specifications or to compensate (idle in particular) for the awful smog devices of the day. It might also be how the timing was measured. There is  possibility that certain cars were set with the vacuum advance attached and that would elevate the timing at idle (hence the 6 vs 20 degrees) but upon acceleration timing would drop.

When one observes the smog devices of the 70's/80's it seems as if there were teams assigned to certain RPM ranges each designing a separate device and then they were just thrown onto the engine thinking it added up to a collective whole. I'm not saying it was that way, just that the end result has the appearance of such.

 Even the OBD I injection was a significant advantage over the carburetors of that time era. Some here have gone to the add on injection systems* while others have just adapted a complete engine swap from the 80's/90's Mustangs or Rangers.