Question on ignition timing marks
Question on ignition timing marks
All,
I have a 1966 corsa 140 4 speed. According to the tuning specs the timing should be set a 18 degrees... but the timing marks on the car only go to 16 degrees. What do you do guess ? I currently see it flashing a bit past the 16 mark... but it kind of silly to require 18 on a 16 gauge...
I have a 1966 corsa 140 4 speed. According to the tuning specs the timing should be set a 18 degrees... but the timing marks on the car only go to 16 degrees. What do you do guess ? I currently see it flashing a bit past the 16 mark... but it kind of silly to require 18 on a 16 gauge...
Jeff M. in Phoenix, AZ
1966 Corsa 140 4-speed
1966 Corsa 140 4-speed
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Re: Question on ignition timing marks
The timing mark 16 is above a short mark. The next full line is the 18 mark.
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Sent from my iPhone using Corvair Forum mobile app
Jerry Whitt
ASE CERTIFIED MASTER TECHNICIAN
Retired
Hemet, Callifornia
65 Monza, purchased new
65 Corsa convertible
ASE CERTIFIED MASTER TECHNICIAN
Retired
Hemet, Callifornia
65 Monza, purchased new
65 Corsa convertible
Re: Question on ignition timing marks
but there is no 18 on the scale... it's stops at 16..
Jeff M. in Phoenix, AZ
1966 Corsa 140 4-speed
1966 Corsa 140 4-speed
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- Posts: 887
- Joined: Thu Sep 26, 2013 2:42 pm
Re: Question on ignition timing marks
The scale starts at 0, then 4, 8, 12, 16, then a smaller space of 2 degrees which then is 18
Jerry Whitt
ASE CERTIFIED MASTER TECHNICIAN
Retired
Hemet, Callifornia
65 Monza, purchased new
65 Corsa convertible
ASE CERTIFIED MASTER TECHNICIAN
Retired
Hemet, Callifornia
65 Monza, purchased new
65 Corsa convertible
- bbodie52
- Corvair of the Month
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Re: Question on ignition timing marks
Some illustrations may be helpful. Although the shop manual distributor specifications state 18 degrees BTDC, the tune-up chart from the same manual specifies a range of 16°–20°.
Here is a close up of the standard timing scale casting. A small mark can be see to the right of the 16° mark...
Here is a close up of the standard timing scale casting. A small mark can be see to the right of the 16° mark...
Brad Bodie
Lake Chatuge, North Carolina
1966 Corvair Corsa Convertible
Lake Chatuge, North Carolina
1966 Corvair Corsa Convertible
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Re: Question on ignition timing marks
I wonder how many different timing blocks GM made, here is my 64 110.
64Powerglide, Jeff Phillips
Kalamazoo, Mi..
Kalamazoo, Mi..
Re: Question on ignition timing marks
Thanks All...
I can't see the end mark that Brad mentioned (52 year old car) but I guessed and retarded to where I though where 18 degrees would be and using my ear, she perked right up and ran really smooth... all the pinging under load is gone now... purrrrrrrr......
Thanks again... Corvair folks are so cool...
I can't see the end mark that Brad mentioned (52 year old car) but I guessed and retarded to where I though where 18 degrees would be and using my ear, she perked right up and ran really smooth... all the pinging under load is gone now... purrrrrrrr......
Thanks again... Corvair folks are so cool...
Jeff M. in Phoenix, AZ
1966 Corsa 140 4-speed
1966 Corsa 140 4-speed
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Re: Question on ignition timing marks
Best timing for these cars in most cases is advanced as far as possible with no ping under any driving condition. There are exceptions as some engines can be over advanced beyond good operation and still won't ping:)
Corvair guy since 1982. I have personally restored at least 20 Vairs, many of them restored ground up.
Currently working full time repairing Corvairs and restoring old cars.
https://www.facebook.com/tedsautorestoration/
Located in Snellville, Georgia
Currently working full time repairing Corvairs and restoring old cars.
https://www.facebook.com/tedsautorestoration/
Located in Snellville, Georgia