Imagery...

[Super_Randy]

shouldn't those be floating?

[Super_Randy]

[schwim]

I have a lot of questions about that. I just can't see how a second spark plug would change the output of that engine by any significant margin even if it's intended to be a "lagging" spark to try to benefit from any unburnt fuel.

[Super_Randy]

here's the kicker. it's a Porsche engine. probably from a 356. iv got a feeling it may be a redundancy/backup for endurance racing. but really im just guessing here.

[schwim]

Oh I bet you're right, a redundant system like in a plane. Smart thinking but so complex for a 4 cylinder lawn mower. Love that exhaust though!

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[Maddel]

https://en.wikipedia.org/wiki/Porsche_5 ... ansmission

https://de.wikipedia.org/wiki/Fuhrmann-Motor

https://en.wikipedia.org/wiki/Dual_ignition

Dual ignition provides two advantages: redundancy in the event of in-flight failure of one
ignition system; and more efficient burning of the fuel-air mixture within the combustion chamber.

The air/fuel mixture burns relatively slow...
With two spark plugs the flame front will progress faster and more uniformly throughout the combustion chamber.

[schwim]

I bet that fan moves some SERIOUS air across the cylinders. Look how wide it is, like a mini jet turbine

[schwim]

Perhaps from a movie or TV show?



EDIT: Looks like it is.

[Maddel]

I bet that fan moves some SERIOUS air across the cylinders. Look how wide it is, like a mini jet turbine

[Maddel]

Perhaps from a movie or TV show?

Hey, that's Dudu the Superbug: https://en.wikipedia.org/wiki/Superbug_(film_series)