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A mystery in reverse.
K2-K6:
--- Quote from: Bryanj on April 05, 2026, 07:32:09 AM ---Timing slightly wrong, rd 200 twins used to do it, when you went to start they kick back a bit and rotate backwards and being two stroke run happily
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A friend had an RD250 do similar years ago. Washed it and rinsed with hose, tried starting it and with probably water compromised plug caps etc, it kept backfiring when kicking. Perseverance saw it start with a distinct and odd sounding run, put it in gear and pulled away backwards ;D
K2-K6:
Here's a hotbulb diesel starting https://youtu.be/kCoOTbhapnk?si=SQ0y9_2zXopDRLw1
Notice he bounces it off compression to spin it initially, then slows it right down while running, to then "bounce" it off compression again and flip the rotation to how he wants it. Watch the flywheel rotation as its at slowest running speed to see it reverse.
AshimotoK0:
--- Quote from: K2-K6 on April 06, 2026, 08:02:51 AM ---
--- Quote from: AshimotoK0 on April 05, 2026, 08:56:37 AM ---I had a Mitsubishi Carisma GDI (petrol, 11:1 compression ratio) that rolled backwards at a zebra crossing and started up in reverse ... cacophony of noise, plumes of smoke out of exhaust ... but nobody I tell this too believes me ... yea it did happen and this is April 5th not the 1st :D
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Quite possible as its direct into closed cylinder injection. Likely it SHOULD work backwards in a fashion, by drawing air in through exhaust system and opposite for intake temporarily. It would have both late fuel and late ignition, probably ran at lowish rpm ? Although no throttling on exhaust side to control it, just system restricted air supply. That retarded, effectively, ignition now at atdc would stop it running away.
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It sounded like a bag of spanners and yes very low revs... at least you believe me that it could happen ! Only the second person though !
Bryanj:
Even more fun with truck with V8 GMC stroker(Detroit), they had an emergeny flap that dropped accross the supercharger intake as the govenor did not work when running backwards
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