Engine running hotter with 6A? Too retarded?

[Brit01]

Just installed a 6A with a Bosch standard coil.
Plugs changed to 1 heat setting colder.

Runs great but at the original ignition timing (7 degrees) I find the engine running hotter.
No pinging/detonation whatsoever.

Can this be caused by the timing being too retarded then?

Do I need to advance it more due to the stronger spark and better combustion?

Hotter conditions can be caused by too advanced and too retarded timing though.

[msdtech1955]

list combo ( is it carb or efi)

[Brit01]

carbs. double dellorto. vacuum advance from carbs.

I checked the advanced timing at 4500 rpm today and it was slightly too much over the 34 degree mark on the flywheel.
Retarded it slightly.

(also pushed it very hard this morning and heard a touch of pinging under load!)


Will test it tonight on the way home to monitor the temp and make sure there is no detonation.

[Brit01]

All back to normal temp ranges.

I think adding the stronger spark from the MSD required the timing to be retarded a little. I don't know but all is as it should be now.

Will check the plugs soon as I installed 1 heat range colder for the MSD.
Not sure if this is necessary or not.

[Brit01]

I have the TDC timing less than the factory recommendation(7-9) now and it still detonates a little under hard acceleration and also hesitates to start on the first attempt of turning the key.

Advanced timing is on the limit (34 degrees) at around 4500 rpm.

Still too advanced? Is the TDC timing not so important here?

Surprised that the MSD has affected the timing so much.

[msdtech1955]

sounds lean.

[Brit01]

I've got fat .55 idle jets (factory jets are 0.52).

I tried 60 idle jets but they were way too rich, spitting out black soot from the tailpipe.

55's are a good in between with virtually no hesitation.

I see now that if it's too retarded the engine will heat up quickly when idling but will not ping and not be hard to start.

So this can't be the case. I get pinging and hard starting (just the initial 2 seconds).

I will retard the max timing a little more to the point I hear no pinging but am concerned about the initial timing and it heating up at idle.

Maybe the alfa and Bosch dizzy is not very compatible with the MSD.

[Brit01]

Could the spark plugs be too hot? (NGK 8 heat rating)

[Brit01]

Well I'm going to disconnect the MSD unit and compare it with stock with the same timing.

[msdtech1955]

do you have a air fuel meter on this ?