Timing questions?
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Senior User
Joined: Jan 2008
Posts: 224
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From: On a farm near Malmo
Timing questions?
I finally got around to buying a Ferret diesel injection adapter for my advance timing light. In the instructions it says that pulse injection timing readings are 7-10 degrees before luminosity timing readings.
I was wondering what the proper timing for my truck should be?
I also have a 7.3L turbo pump on my engine does it need to be timed different?
I would like to know what the advance curve should be and what it should be adjusted to for a little better performance?
I was wondering what the proper timing for my truck should be?
I also have a 7.3L turbo pump on my engine does it need to be timed different?
I would like to know what the advance curve should be and what it should be adjusted to for a little better performance?
Post Fiend
Joined: Nov 2004
Posts: 5,638
Likes: 1
From: Manitoba
DieselDon's info
If you have the original emission label on your valve covers, they gave the max pump fuel flow rate in mm3 at rated HP.
As I recall 6.9 was about 48mm3 sea level and 44mm3 for high altitude pump
7.3NA was about 54mm3 and 49mm3 for high altitude
7.3 IDI Turbo - 58 mm3 ( this is out of the Ford book )
Optimum timing: 6.9IDI ( Ford method ): .5-1.5 degrees ATDC
6.9IDI ( Navistar method ): 6-7 degrees BTDC
7.3 NA: 8-9 degree BTDC*
7.3 IDI Turbo: 8-9 degrees BTDC*
Anything above these, the engine get's pretty noisey.
* helps engine starting. Original timing was 5-6 BTDC and engine cranked a long time ( at least in comparison to (6.9 ) before starting.
If you have the original emission label on your valve covers, they gave the max pump fuel flow rate in mm3 at rated HP.
As I recall 6.9 was about 48mm3 sea level and 44mm3 for high altitude pump
7.3NA was about 54mm3 and 49mm3 for high altitude
7.3 IDI Turbo - 58 mm3 ( this is out of the Ford book )
Optimum timing: 6.9IDI ( Ford method ): .5-1.5 degrees ATDC
6.9IDI ( Navistar method ): 6-7 degrees BTDC
7.3 NA: 8-9 degree BTDC*
7.3 IDI Turbo: 8-9 degrees BTDC*
Anything above these, the engine get's pretty noisey.
* helps engine starting. Original timing was 5-6 BTDC and engine cranked a long time ( at least in comparison to (6.9 ) before starting.
Posting Guru
Joined: Oct 2005
Posts: 1,030
Likes: 0
From: Powell River B.C.
With the pulse method you are looking for 8.5 BTDC at 2000 rpm. If I recall when I timed mine it was around 11 or 12 BTDC at idle rpm (600). All of the specs for timing are for higher rpms, more accurate for an engine under load. Idle rpm timing is more irratic as the advance plunger and internal fuel pressures may varry more at that rpm.
