Pinking or cam chain?

[Judderi]

When accelerating on cheap petrol i get a rattling type sound from the engine and i loose a little power. But when im running on LPG i never get the noise. Then i noticed when running on higher RON petrol i.e optimax the noise is significantly reduced. I thought at 1st that it was the cam chan flapping about and rattling but now im wondering if this is what pinking sounds like. If it is pinking do i just need the timing set up correctly?

[kniterider]

my 16v's have always been ok on what ever fuel, but as your running lpg also is the timing different for that?? dont know much about lpg but i know timing has to be altered for diffo fuels, knock sensors usually adjust timing to suit, but on the 16v they dont have them i think... i could be wrong... havent got one to go look at at the mo...

[Judderi]

i dont think mk2 valvers have a knock sensor.

[Organisys]

No knock sensor, and sounds like pinking.

[Judderi]

Next obvious question then, how do i solve it? Do i just need to advance or retard the timing by twisting the distributor? Or is now a good time to get it rolling road tuned like i have been wanting to do for ages?

[Organisys]

Set it up on 98 RON fuel. Advance timing slightly if required. Rolling Road best way but more $