ignition timing for pre serp Griff 500

[onny]

Can anyone tell me the ignition timing for a pre serp Griff 500 engine. I've done a quick search and found for a Chim 4.0 engine its around 28 @ 4000 rpm but I can find the value for a 500 engine. I'm running on Optimax fuel if this has any difference to the timing required.

Can you please also tell me how I can tell if the engine is pinking? Does it cause a specific engine noise or can I tell by other means?

[Davidn]

onny,
28 sounds about right, had mine set to 28 but caused it to pink, some engines are happy at that setting some are not, just needed retarding a fraction for me.
Pinking is fairly easy to spot/hear. It's quite a metalic rattle and for each engine and that particualr ingnition setting it should occur at roughly the same revs each time.
Hope of some help.
David

[Guillotine]

depends on dizzy!!?

mines pre serp and runs 29 degrees for max power (mark adams). 28 is fine - mine ran fine - advancing timing will increase power - up to 32 degrees!! but mine pinked like hell there.

pinking as stated is a metalic clatter under HEAVY load. 50mph 4th gear, if it rattles when you floor it...its probably out.

cheers

PS it has been known for the timing marks to be wrong

[gerjo]

Indeed, get the timing mark right first.
Mark put mine on 30.5 degrees (with the old cam).