ignition timing some odd readings - sorted

Charger · Post by **Charger** » Sun Apr 20, 14 5:48 pm

having never taken a dizzy apart before I might need it

Steve · Post by **Steve** » Sun Apr 20, 14 5:52 pm

I managed Si so you will walk it! The instruction sheet that comes with the FBO plate is just what you need....goes through it step by step

Charger · Post by **Charger** » Mon Apr 28, 14 11:46 am

didn’t need the limiter plate after all

the dizzy has already got an adjustable mechanism

live and learn …

Dave-R · Post by **Dave-R** » Mon Apr 28, 14 11:48 am

Not seen one of those before. Very neat.

Charger · Post by **Charger** » Mon Apr 28, 14 11:55 am

I measure the slots where the advance tabs sit at 6.5mm initially, that was giving me 21deg of advance, wanted 14deg, worked out the gap needed to be 4.3mm, set it, tried it …

rpm … -> … advance
850 … -> … 20
1500 … -> … 23
2000 … -> … 32
2500 … -> … 32
3000 … -> … 32
3500 … -> … 32

not bad for first attempt

do you think I need to fit a stronger spring??

I took the car for a run, seemed well happy with the new settings, no detonation what-so-ever

I am going to open up the gap a touch to get the desired 34deg

Steve · Post by **Steve** » Mon Apr 28, 14 12:10 pm

Great result Si ... top quality photo and detail as always matey...think you are right about springs...all in at low revs and I think it should'nt be all in till around 3000rpm so stiffer springs will slow down the advance curve to make it more gradual

Dave-R · Post by **Dave-R** » Mon Apr 28, 14 1:03 pm

I think you said it liked to idle with a higher initial but just wouldn't start?

In that case I would leave it with that faster rate of advance unless you notice any problems.

Charger · Post by **Charger** » Mon May 05, 14 9:40 pm

cheers Steve/Dave

righto sorted, initial 20deg, total 34deg

everything’s peachy so going to leave it like that for now

Steve · Post by **Steve** » Mon May 05, 14 11:04 pm

Fantastic!! Love your new pic by the way...looks mean!!

Dave-R · Post by **Dave-R** » Tue May 06, 14 8:39 am

Now the timing is sorted you WILL need to adjust your idle mixture at the carb. Adjust JUST rich enough for max manifold vacuum at idle (and in gear if an automatic) at 800rpm.

Charger · Post by **Charger** » Tue May 06, 14 9:46 am

thanks again

will do Dave

Steve · Post by **Steve** » Tue May 06, 14 10:23 am

Dave....just remind me mate....is the gauge attached to the lowest vac port on the carb?

cheers Steve

Dave-R · Post by **Dave-R** » Tue May 06, 14 10:29 am

Usually yes. Manifold vacuum is from any port venting from below the throttle blades.

Steve · Post by **Steve** » Tue May 06, 14 10:43 am

Thanks Dave...

cheers Steve

Dave-R · Post by **Dave-R** » Tue May 06, 14 11:09 am

Just don't forget you have it in gear and go and rev the engine.....