install my mtdi pump 0460424138 but what should I set the timing to?
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samuraitd
Veteran Member
Everybody is different in what they prefer the timing set at. I have been recommended to set mine at .9mm, and somebody else told me to set it at 1.0mm. I put mine at .9 and it runs good.
oil_me
Veteran Member
I have the same pump also set at .90mm after much testing.
samuraitd
Veteran Member
vanbcguy
Veteran Member
If you find someone with a pulse adapter and a timing light you can help answer this question once and for all!
whitegm1
Well-known member
- Joined
- Jun 6, 2010
- Location
- CALIF
- TDI
- 1980 Rabbit Pickup/AHU Diesel, 5spd, 12mm IP, .216 nozzles, 45mpg
I am doing much the same with a 98 Jetta AHU in my 1980 pickup,
difference is I will be running;new Bosch 12mm pump head with 20mm shaft injection pump & .216mm injector nozzles.
Some info from others I have collected, Mark
TDI TIMING, 1.1 TO 1.6, 1.32mm good
Another say’s; 1.25mm -1.40 max with .187 nozzles
difference is I will be running;new Bosch 12mm pump head with 20mm shaft injection pump & .216mm injector nozzles.
Some info from others I have collected, Mark
TDI TIMING, 1.1 TO 1.6, 1.32mm good
Another say’s; 1.25mm -1.40 max with .187 nozzles
vanbcguy
Veteran Member
It's highly dependent on the camplate in the pump, that's why there are so many different values out there. The shape of the ramp heavily influences the timing setting.
JaysinSpaceman
Veteran Member
Some things that affect static timing:
Pump piston size (9,10,11,12 mm) The larger the piston the lower it's lift at TDC for the same crankshaft degree timing.
Cam plate shape, this is much more subtle but it will change timing somewhat. Cam shape changes the way an injector fires more then when.
Injector pop pressure, lower pressure earlier firing. This is why injector balance is very important.
Injector line length, Longer lines = later firing. This is why line lengths need to be the same.
But all of this is just changing when the injector is firing. If your compression is low the actual combustion event happens later then if the compression is higher (within spec). All static injector pump timing specs are based on a known set of parameters and if those parameters change then the static timing will also need to change.
Basically what I am saying is that MTDi timing is going to depend on your particular setup. I think that a diesel timing light adapter is going to be a crucial instrument when I set up the timing on my new motor. With my 12mm head I think a good place to start is at the .8-.9 mm at TDC and then time with a diesel timing light to about 12+/- degrees before TDC crank timing (this seems to be the consensus for timing light timing).
Jaysin
Pump piston size (9,10,11,12 mm) The larger the piston the lower it's lift at TDC for the same crankshaft degree timing.
Cam plate shape, this is much more subtle but it will change timing somewhat. Cam shape changes the way an injector fires more then when.
Injector pop pressure, lower pressure earlier firing. This is why injector balance is very important.
Injector line length, Longer lines = later firing. This is why line lengths need to be the same.
But all of this is just changing when the injector is firing. If your compression is low the actual combustion event happens later then if the compression is higher (within spec). All static injector pump timing specs are based on a known set of parameters and if those parameters change then the static timing will also need to change.
Basically what I am saying is that MTDi timing is going to depend on your particular setup. I think that a diesel timing light adapter is going to be a crucial instrument when I set up the timing on my new motor. With my 12mm head I think a good place to start is at the .8-.9 mm at TDC and then time with a diesel timing light to about 12+/- degrees before TDC crank timing (this seems to be the consensus for timing light timing).
Jaysin
vanbcguy
Veteran Member
I really don't see how I could have set mine up without my pulse adapter. Non standard nozzles, a pump that was never meant to be bolted to this engine....