Timing
Moderator: Moderators
It depends on your set up.
I assume you have a pretty stock Dizzy with mechanical advance.
You are aiming for 34 degrees all in at around 3000 rpm and then as much initial timing as you can get - given the limitations of a stock dizzy. This is the killer.
When checking your initial timing it is best to have the car chocked and in "D" and at the correct idle speed. Often you can find that the timing can drop out once in gear and this usually points to the Convertor being too tight.
There are loads of threads on here about setting timing, use the "Search" facility and have a good read to understand the principles and issues.
Thanks
Pete
I assume you have a pretty stock Dizzy with mechanical advance.
You are aiming for 34 degrees all in at around 3000 rpm and then as much initial timing as you can get - given the limitations of a stock dizzy. This is the killer.
When checking your initial timing it is best to have the car chocked and in "D" and at the correct idle speed. Often you can find that the timing can drop out once in gear and this usually points to the Convertor being too tight.
There are loads of threads on here about setting timing, use the "Search" facility and have a good read to understand the principles and issues.
Thanks
Pete
Pete Wiseman; Cambridge.
Mopar by the grace of God
Mopar by the grace of God
timing …
my 383 likes 20deg initial 34deg max all in at 2500rpm
Dave’s laws ...
Dave’s tuning guide
ignition ...
https://web.archive.org/web/20160214201 ... f=13&t=828
Dave’s tuning guide
carb ...
https://web.archive.org/web/20160214202 ... =11&t=5308
loads on here about timing ...
http://www.moparuk.com/forums/viewtopic.php?t=45873
http://www.moparuk.com/forums/viewtopic.php?t=35148
http://www.moparuk.com/forums/viewtopic.php?t=35679
my recent timing exploits ...
http://www.moparuk.com/forums/viewtopic.php?t=46913
and some more of the same ...
http://www.moparuk.com/forums/viewtopic.php?t=46806
my 383 likes 20deg initial 34deg max all in at 2500rpm
Dave’s laws ...
Dave’s tuning guide
ignition ...
https://web.archive.org/web/20160214201 ... f=13&t=828
Dave’s tuning guide
carb ...
https://web.archive.org/web/20160214202 ... =11&t=5308
loads on here about timing ...
http://www.moparuk.com/forums/viewtopic.php?t=45873
http://www.moparuk.com/forums/viewtopic.php?t=35148
http://www.moparuk.com/forums/viewtopic.php?t=35679
my recent timing exploits ...
http://www.moparuk.com/forums/viewtopic.php?t=46913
and some more of the same ...
http://www.moparuk.com/forums/viewtopic.php?t=46806
Si
1970 Charger 500
383 | 4bbl | 727 column | PAS | PAB | buckets/buddy - check out my photos HERE
If you don't want another same old brand-new car ... you could be DODGE MATERIAL
1970 Dodge Charger Registry - https://www.1970chargerregistry.com/
1970 Charger 500
383 | 4bbl | 727 column | PAS | PAB | buckets/buddy - check out my photos HERE
If you don't want another same old brand-new car ... you could be DODGE MATERIAL
1970 Dodge Charger Registry - https://www.1970chargerregistry.com/
Had a play, moved dizzy until engine revs levelled off. Tried to start but dragged starter a bit so backed it off a little until it was happy.
Checked with timing light, looks like I have 20 degree initial.
I have connected vac to manifold vac for now, I have ordered the plate that goes in dizzy from Turnip and will pick it up at nats.
Once timings spot on I will go thru carb to try and cure my backfire through carb.
Checked with timing light, looks like I have 20 degree initial.
I have connected vac to manifold vac for now, I have ordered the plate that goes in dizzy from Turnip and will pick it up at nats.
Once timings spot on I will go thru carb to try and cure my backfire through carb.
1969 Dodge Charger
1972 Chrysler Hardtop
1972 Chrysler Hardtop
Just took Charger for a drive after altering the initial timing, seems to run a lot smoother, still backfires through carb when you go from idle ish speed and then put your foot down.
When cold, engine idles at about 700rpm, after a 10 minute run its idling at 1500rpm and then slowly drops to about 1200rpm. Is that normal?
When cold, engine idles at about 700rpm, after a 10 minute run its idling at 1500rpm and then slowly drops to about 1200rpm. Is that normal?
1969 Dodge Charger
1972 Chrysler Hardtop
1972 Chrysler Hardtop
Set it in "D". I would guess it will be lower than 900 but there are so many variables - engine tune/ cam/ etc; and most importantly torque convertor stall. Set it so it is a comfortable consistent idle and then see how much the rpm increases when you shift to "N".
Be careful, chock the car and do not raise the revs too high or get someone to hold it on the brakes for greater safety.
Be careful, chock the car and do not raise the revs too high or get someone to hold it on the brakes for greater safety.
Pete Wiseman; Cambridge.
Mopar by the grace of God
Mopar by the grace of God
Sound like your float level in the carb might be too high causing the backfire when accelerating and causing the idle to be too high till the excess fuel burns off and then settles. A vacuum leak can cause erratic idle.
www.apdautomotive.co.uk
APD Automotive
Unit B3 Connaught Business Centre
22 Willow Lane
MITCHAM
CR4 4NA
0208 6400729
https://www.facebook.com/#!/apdautomotive.ltd
APD Automotive
Unit B3 Connaught Business Centre
22 Willow Lane
MITCHAM
CR4 4NA
0208 6400729
https://www.facebook.com/#!/apdautomotive.ltd
I have got myself a (2nd hand) Snap on MT1261A timing light and am in the process of checking my timing. Bear with me as its first time I've done it. Got the lead on plug 1. At tickover of 750 it's reading 26degs at 3000rpm it's reading 36. My cars a 383 manual.
Last edited by XP29 on Tue Aug 02, 16 11:44 am, edited 1 time in total.
1966 Charger, 383 4bbl, 4 speed manual trans, Sure-grip, original paint.
Been and checked it again, I'm at 21 at idle and from 2500 to 3500 it seems to be staying about 34 degrees. So I'm presuming I don't need to fit a limiting disc in my dizzy?
I am still getting a bogging down as I set off flooring it (as in on the strip).
I am still getting a bogging down as I set off flooring it (as in on the strip).
1966 Charger, 383 4bbl, 4 speed manual trans, Sure-grip, original paint.