Engine ignition problem

[PCHunt]

Originally Posted by VETE76

as of 10:30 am 2day I now have a strong running io360 thanks to Dave l. the mags were timed perfect but the internals were timed to a different cylinder. he took the mags apart and put them together the correct way, installed them, set them and said 100% guarantee it will start 1st time especially with that slick start u added. ..............fred

I could be wrong, but the internal mag timing is setting the E-gap. Internal timing is for the mag only, and doesn't reference any cylinder. You time the mag to the engine after setting the internal E-gap, which is when you need to time the mags to TDC on Cyl #1, using the correct advance, usually around 25 degrees BTDC.

Are you saying that the leads weren't attached to the mags correctly, so that they went to the wrong cylinders?

[VETE76]

it just like on a car engine the
'gear on mag and drive gear from engine must be mated exactly right. mine were 180 deg miss aligned
so when #1 was in position to fire the mag sent the spark to #4 intake stroke

[Auburntsts]

So that begs the question as to how did it ever run on the test stand?

[VETE76]

Originally Posted by Auburntsts

So that begs the question as to how did it ever run on the test stand?

that's what I asked Lycoming. awaiting answer

[airtractor8]

Originally Posted by VETE76

it just like on a car engine the
'gear on mag and drive gear from engine must be mated exactly right. mine were 180 deg miss aligned
so when #1 was in position to fire the mag sent the spark to #4 intake stroke

mmmm, read post #22