disco pump, timing

[oldskool rich]

finaly got a disco MTDI running, but doesnt run very well, think its set up wrong or sumit maybe i got the timing wrong, i set it to 0.84, can anyone confirm if this is right? max fuel screw is all the way in and it starts but runns like a bag of *** with loads of white smoke

anyone know what might be going wrong, revs go up and down, up and down without touching throttle, it drove for about a mile, was realy quite fast, my A6 couldnt keep up . i had to change the seal on the throttle shaft and whilst i was doin it i swapped the gov spring for the one off an aaz. im sure that pump has alot to giv


any help will be much appreciated and once done i will document the full journey

[blackdogvan]

Geez my memory sucks Rich but I believe Giles told me 0.95, for mine.

[monkey magic]

Mine is timed to 1.65 edit:1.54, as somebody on here said that is what they are timed to on the landy engine. Though down on power, it runs and drives fine.

Cant get my head round whether or not it should be timed as per landy spec or vw spec, makes sense it should be as per vw. Giles says on his website 0.95 I believe.

Blackdogvan, is yours a disco pump too? I'm keen to hear the official line on correct timing for these units.

[Dougslug]

I have seen 0.95 for the earlier tdi's and 1.05 for ALH onwards
Thats where I would start
My thoughts are that if the IP is well set up then getting a good idle should be a matter of
setting up the static timing right....I may be wrong though!
Also I think that by screwing in your max fuel screw to the limit, you are narrowing the opperation or spectrum of the accelerator
on the primary lever, therby affecting high and low rpm running

[svenakela]

I'm pretty sure the Land Rover timing is more correct than the VW setting. The timing is related to the pump cam, and that is specific to the pump.

My pump arrives any day now.

[burn_your_money]

I think timing would be somewhere in between VW and LR timing. Yes the pump cam plays a big role but so does the combustion chamber. It'll be a matter of trial and error.

[golftd412000]

in the all pumps make for my friends... ,the good timing is 1.00mm

[oldskool rich]

i know for a fact that there is a magic number, my corrado is spot on, it fires up at the turn of the key and runs like a dream (but has no turbo) but even a fraction out and ut runns like crap, someone on here gave the right answer last time when i was first building one of these for my corrado, i dont think it was 95 but i could be wrong. i might go and check the corrado and see what that was set to. the only way it would start was to screw the max fuel screw all in

[rolo]

Just spent all day with just what you describe. If you find that magic spot let me know what it is. Have you got the max fuel screwed in on the corrado as well?

[monkey magic]

oldskool, are you thinking of this thread?

http://www.vwdiesel.net/forum/index.php?topic=17305.0

sprockets, second post down..

its where i got the timing for mine from. And it seems to run smoothly enough

Anybody know how big a 'window' there is for ok running, ie  0.05 +/-,   or 0.1 +/-, or  0.15+/- etc...

between rich's 0.84 and my 1.54, thats a fair range. I'm tempted to reduce mine a little and see if it changes for the better.

[snakemaster]

i set all my pumps by ear and looking at the exhast , sounds like your pump needs a little adv 

[oldskool rich]

yes, thats easy enough wen you can twist the pump by hand but with a disco pump you can only adjust it with the pully


yes thats right. 1.54, thats the magic point i remember now, thats what the raddo is running, hopfully that will solve all problems, i will confirm this tomoz.

take no notice of my 0.84, duno why i had that in my head, i knew it was sumthin 4 

[monkey magic]

If you try a couple more settings on the way to 1.54, let us know how you get on.. Mine at 1.54, as said, is down on power, but runs sweet enough, and starts on the button. Think I just need some governer mod action....

[oldskool rich]

i thort the gov might cause problems so i swapped to an AAZ spring, sorry diddnt get chance to do it today

after seeing how fast it was wen the timing was wrong and if your saying urs has no power i would say that your probly on to sumthin
my corrado ran out of revs, if it actualy had a turbo it would of hit the limiter just as it came on boost so gov might be the cause of this too, discos only rev to like 3.5-4 wen i rekon it should be hitting about 5. my AAZ ran 6 with no govener but i dont think TDI will handle that, on my most recent 1Z engine i have removed the fly weights, i wana see how that effects things

[oldskool rich]

i timed it perfectly but getting nothin but white smoke and running like a bag of nails, hardly any throttle response, im gona just do it manualy, its way too far retarded, im not conviced this pump even has the right cam plate, who ever rebuilt it forgot to put in the rubber o ring that seals the throttle shaft too    makes me wonder what else they left out