Setting Ignition Timing With Strobe

[treesimon 0]

Alittle while ago i sent a distributor of to H&H ignition solutions to get refurbed. Once i got it back i fitted it,and used a gunson advance timing light. Set the idle speed to 700rpm and set the strobe to 5degree BTDC. Vacuum advance disconnected.

 

I wrongly attached the inductive pick up to the 4th cylinder (cam pulley) rather than no1 cylinder then set the dizzy.

 

Later on i knew it was wrong. So started over again fitted to no1 lead. Resetting the dizzy i only had to move it roughly 2degrees retarded.

 

Looking at my spare engine in the garage i could see that piston no1 and no 4 are both at the TDC but no1 was on it firing stroke and no4 was on its exhaust stroke.

 

What i cannot understand is why i only had to retard the dizzy by only 2degree , surely i should have had to have moved it more.

 

Have i messed up?

[Nitropixie 0]

No you haven't. With your timing mark being on the crankshaft, the crankshaft will always rotate twice to the rotation of the camshaft/dizzy. So the crankshaft will be in the same position at 0 degrees on the camshaft and at 180 degrees on the camshaft, so really it doesn't matter if you have put the strobe light pickup on 1 or 4 cylinder.

[treesimon 0]

No you haven't. With your timing mark being on the crankshaft, the crankshaft will always rotate twice to the rotation of the camshaft/dizzy. So the crankshaft will be in the same position at 0 degrees on the camshaft and at 180 degrees on the camshaft, so really it doesn't matter if you have put the strobe light pickup on 1 or 4 cylinder.

 

 

Makes sense as its 2:1 ratio. Just wanted to make sure i had done anything wrong.

 

Cheers

[macaroni 17 1 Cars]

Have you felt any tangible benefit with the new dizzy setup?

[treesimon 0]

Have you felt any tangible benefit with the new dizzy setup?

 

 

Its hard to say to be honest, on the old unit the vacuum advance was u/s. The new gives more mpg. how many god knows but a noticeable improvement. The idle improved to, but this could be cause i rest the dizzy with the strobe at the same time.

 

Only cost £100 from H&H including p&p they replaced vacuum advance. advance springs + posts and fitted a new rotor and cap. They also painted the dizzy.

I felt it was a reasonable price.

 

Just need to get a recon air flow meter next. Ordering 1 tomorrow.