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A mystery in reverse.

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AshimotoK0:
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

Athame57:
Thanks for the answers everyone.  8) Skoti, maybe the diode was broke or missing, the bike was a bit of a heap. Micky, I got a GF later, but the real reason I teamed up with Becky was to exploit the so called the Greater London Mobility Scheme, it was a GLC thing of the day were if there was two of you they would get you a flat quickly, we had both been living in Earls Ct bedsit land.
Ted My first bike was an Ariel Arrow too, the trouble is mine was the Airfix!  ::) I should have left it in the box, they are worth a lot of money on fleabay, I just checked!  ;D
Bryan You seem to have answered the question for me, ok so bad timing can cause reversing!  ;D
Well, I won't be buying any DTs, if I do it will be down to DRINKING!
If I want to ride in reverse I'll get myself a Ural outfit. 8)

Bryanj:
Sold a new ural once but the man wanted the posh sidecar not the military one, all sorted EXCEPT chair on wrong side making it an absolute pig to ride!

Athame57:

--- Quote from: Bryanj on April 05, 2026, 10:14:48 AM ---Sold a new ural once but the man wanted the posh sidecar not the military one, all sorted EXCEPT chair on wrong side making it an absolute pig to ride!

--- End quote ---
I'd be one nervous passenger!  :o

K2-K6:

--- 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

--- End quote ---

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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