Injector Pump Timing...

[nemesis]

No disputing it...Ive changed the timing belt and got appreciably more power through to higher revs and all I can attribute it to is a minute change in pump timing. Id love to tweak more but Im curious...

Having been through the advance-testdrive-advance-testdrive-retard-testdrive-advance-testdrive what do all those who advocate this do thereafter?

a) Go through this process every time you get the engine tuned (cause the first thing your mechanic is going to do is slap the dial gauge on the pump and reset it to specification of 0.5mm @12 BTC),

b) never get your engine tuned again (eventually this is going to negate any HP gains you have made),

c) Tune your engine yourself (In which case you own a dial gauge so why can no-one give quantitative data on how far the timing should be advanced?).

[geeves]

Tune engine??
Diesels are pretty much set and forget. Even the timing belt changes shouldnt change anything.
The closest thing my wagon has had to a tune is a tweak by the diesel shop after they replaced the seals. This was done on the car not a flow bench so all done by ear. That was about 170000km Now it has 200000km

[nemesis]

mmmm so you reckon even lash adjustment to valve timing doesnt need doing?

Injector pump timing IS set on the car, not by ear, but with a dial gauge that measures injector pump piston displacement not flow!

[geeves]

ok book says valve clearance needs doing every 30000km. When fitting a pump it should be set correctly as you say but all the tweaks done after that have variable results due to other aspects of a particular car so will be different on each car. This is how dynotunes are done.
Dial guage is needed for the initial setup to manufacturers spec. Every mod done is outside spec

[marckb]

Hi guy's ,

What I read somewhere on the net (not shure where , but it was a Dodge/Chevy forum ) is that the timing can be advanced 3 to 5 degree's max . If you go to far it will knock/ping (over 5 degrees ) So I think it is safe up to 17 degrees BTC .

MarcKB

[MattMU]

Nem I would suggest the timing belt on your rig was done previously and they got it a tooth out. There is no other reason you should have a performance advancement after a belt change.

The timing setup should only be done once and set at the optimum, there should be no reason to keep checking and adjusting after ther initial. The MUs have a rubber timing belt unlike the Rodeos that have gears...so the belts adjust for wear over their life but the rodeos gears do wear and you get more slop in the gears and the timing could need adjustment every so many years.

Matt.