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Originally Posted by Isaac Zachary
No, it was a 4 stroke inline 6 International. And yes, it was pushing the exhaust out the intake.
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Exhaust leaking at the intake during valve overlap is not unheard of.
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AFAIK, any mechanically injected diesel can do this since it injects at TDC regardless of direction.
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Valve and injection timing would also need to revert, which is unlikely to happen, unless for some marine engines which have their valvetrain reversible due to some design features.