im due my 60 k service approx 1k ago lol and have seen some vernier pulleys for the octy vrs. now would this be a good time to get them and get them on if im having the belts done or is it a waste of time getting new pulleys?

Vernier pulleys are a good idea with modified camshafts, which need more accurate timing than the standard ones. I'd not spend out the money unless/until I was changing the cams.

the cams on the octy are connected by a chain, and they have variable valve timin by means of adjusting the tension of the chain so verniers are a waste of time and money on that engine

Hello, i work for Piper Cams so may be able to shed some light on this one.

As said above, their is a chain that connects the 2 camshafts inside the cylinder head on the back of the cams (opposite end to cam BELT side). This chain runs on 2 gears, one on each cam and is how they move together in time. The cams are rotated via the cam belt which runs on a pulley at the end of the Exhaust camshaft.

Now the idea behind Vernier Pulleys is to adjust the cam timing to get the best performance where you need it. For example, if you want top end power, you time the cams in differently to if you want low down torque. And if you want the best of both, you can play with the timing to get it where you want it.

For complete adjustment (in a perfect world) you would need the pulley that goes on the end of the exhaust cam (Belt one) and one adjustable gear so the timing can be adjusted between the inlet and exhaust independantly.

This can be done on all cams, standard and uprated.

I hope this answers any questions you have.

Below is a picture which may explain my rampling a little better.

Kind Regards

Garry

I have never seen a design like that before. Plenty of designs where 2 cams were driven directly off their noses, and a couple where they were driven off the middles (straight 8s) but none tied together like that.

Almost all the VW range is the same, VW 16v from about 198x are all like this also (part of the reason the head flows really bad). Its from where they converted the 8v head to 16v, then from 16v to 20v. All they did was re design the bits that needed doing and not the whole head.

Seems to have been changed in the new FSI engines tho

Kind Regards

Garry

Cheers for that; it makes some sort of sense now.

cheers thats 50 quid saved

50 quid now re spent lol