Can someone compare timing figures with me please?

[M.J.S]

Hi everyone.

Will somebody please do me a favour and check their ignition timing to compare it to mine, but please don't baffle me with science

My engine is a big valve on dellortos, and the dizzy plate is stamped 10 degrees (thanks John for advice on that one). The dizzy all appears to be in fine working fettle and is fitted with luminition electronic ignition.

At approx 1000 rpm, with the ignition timing set at 10 to 12 degrees on the timing marks on the front cover, what should it advance to as revs increase to 3000-4000 rpm?

Looking through old posts - if I understand them right - people seem to expect about 26 degrees or thereabouts.

Mine advances to approx 20 degrees and no more.

Any suggestions if this is right or at fault?

Thanks folks.

Mark.

[elan_fan]

what is the number on the side of the dist. Should be 41189 or 41225. If its a 41189 then you have 14 degrees from 1000 to 2500 which added to your 12 degrees of static gives the magic 26 degrees. If you have 10 degrees of static then you will have 24 degrees total advance above 2500. The springs go weak and you may get initial dist advance earlier. I would start the engine, set the throttle for 3000 revs and swing the dist (after first slighlty releasing the clamp from the dist body) round to 26 degrees then reset the tickover and let the engine idle as slow as possible down around the 750 revs. check the timing, should be back to 12 degrees or there abouts.

regards
Mark

[john.p.clegg]

Mark

You say the timing is 10-12 at 1000rpm,could it be that you've already used some advance getting to 1000rpm? Can you set the timimg static?

John

[M.J.S]

Not quite sure what you mean by that John

Have set timing by having the car at tickover, then with the light set to zero altering the dizzy to show 12 degrees on the timing marks, or alternatively, setting the light to 12 and setting the pulley at 0 degrees.

Set this way once you increase the revs to 3000-4000 the timing mark on the pulley does not advance further than the 20 degree mark on the front case (with the light set at zero).

Have checked my light against another an all ok.

Is it not supposed to show the timing notch in the pulley advance to about 26 degrees on the front cover timing markers?

Or am I getting the complete wrong end of the stick?

Mark.

[john.p.clegg]

Mark

Turn the engine over by hand (plugs out) and check the firing is 10 btdc,if you have weak/broken/one spring it could be advancing between 0 and 1000 rpm...

John

P.S. with luminition,you should hear/see the sparks

[M.J.S]

Understood!

Will have a play tomorrow.

Cheers John.

Mark.