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Michael.

M70 Block & Crank details..

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So I looped this short 1-2 second clip to be about 33 seconds longer so you can appreciate the V12s piston configuration

I find the variation in the way motor configurations are ordered on the crank and their ignition timing quite a fascinating topic.

M70s have a firing order of 1-7-5-11-3-9-6-12-2-8-4-10

The driver side bank is number cylinders 1-6 and passenger side bank 7-12.

If we watch the clip cylinder 1 on the drivers side front hits TDC and a fraction of a second later so does cylinder 7 on the passenger side front.

What I was wondering, is after the above moment, would cylinder 7 be firing at when it then starts traveling to BDC?

It just looks like such a short ignition angle variation, unless I'm missing something?

4 strokes take two full crank rotations, so, 720 deg / 12 cylinders 60 degree per cylinder firing.

Thoughts?

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