Autospeed article on PD injector timing tune

**jazd** · 29-08-2011, 10:59 PM

Originally Posted by benough

Let me know when you've done it Jarred.

Given my limited knowledge, I wont be touching it unless I get a technical manual which can explain how to make adjustments to the twin cams

I've got one more variable than Julian Edgar haha

**Greg Roles** · 30-08-2011, 07:07 AM

No way I'd play with that. Diesels have incredibly close piston to head tolerances, and the chances of hitting a valve are far greater than in a petrol car at half the compression. Chances are the adjustment is only a few degrees, but without checking the piston clearances to the valves at the same time with plasticine or similar you can count me out!

That's one thing I won't be tinkering with!

**Transporter** · 30-08-2011, 07:32 AM

Most likely and almost for sure, no matter how much you adjust it, you should be safe, as long as you didn't remove and incorrectly re-fitted timing belt. That means all timing marks were in the correct positions.

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**GoLfMan** · 30-08-2011, 07:41 AM

after my timing belt my car felt quite sluggish in the top end, the 'powerband' had shifted. (yes... i double checked everything was TDC!) So the next day I advanced my cam timing to the max (which wasn't much from where it was already). Started first time, bang on!

Now goes like a cut cat and boosts 4psi harder. Win.

**gldgti** · 30-08-2011, 02:03 PM

If the t-belt stretches over its life slightly, then surely, in theory the cam will retard slightly as the belt wears in. So, I would have thought that as a logical extension, with a brand new timing belt and the crank in the correct position, the adjustment should be somewhere in the middle of the range or towards the retarded end of the adjustment.

GolfMan - did you advance the cam, or did you actually advance the cam gear? (i.e retard the cam)

(for instance, in the pic on previous page, the cam closest in view is towards the retarded end of the adjustment)

**GoLfMan** · 31-08-2011, 08:45 AM

Originally Posted by gldgti

GolfMan - did you advance the cam, or did you actually advance the cam gear? (i.e retard the cam)

(for instance, in the pic on previous page, the cam closest in view is towards the retarded end of the adjustment)

the cam gear of course, the adjustment is all the way forward on the slots. Am going to back it off a smidge today though

**gldgti** · 31-08-2011, 09:17 AM

cool.....so it all makes sense.

**jazd** · 31-08-2011, 11:04 AM

Originally Posted by GoLfMan

after my timing belt my car felt quite sluggish in the top end, the 'powerband' had shifted. (yes... i double checked everything was TDC!) So the next day I advanced my cam timing to the max (which wasn't much from where it was already). Started first time, bang on!

Now goes like a cut cat and boosts 4psi harder. Win.

What car are we talking about GolfMan?