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Old 12-18-2002, 04:35 PM   #1
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Default engine runs backwards

sometimes, when starting the car for the first time of the day, the engine will actually run backwards. this baffles me. it only does it a couple of times and is not able to do much more than idle backwards. then the next time i start it, it runs great. i was pretty freaked out the first time it happened and the wheels were spining the wrong way!
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Old 12-18-2002, 04:36 PM   #2
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sounds like your one way is buggered

is your car pull start?
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Old 12-18-2002, 05:21 PM   #3
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yes it is. and my one way has been bad for a while. i have to pull it just right to get a start. if i clean it and the starting shaft, it will work fine for a while. but hten the oil just makes it slip.

but how would a slippy one way make the car start backwards??
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Old 12-18-2002, 07:01 PM   #4
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I doubt it would be a slipping one way bearing. I have heard of this happening. Sometimes it is cased by the wrong glow plug (Heat range), or the fuel. If the fuel ignites to early, it can drive the piston in the wrong direction.
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Old 12-18-2002, 09:26 PM   #5
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could accidental backwards starts damage the engine? it wont even rev fast enough to engage the clutch when it runs backwards, so i doubted it was dangerous.
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Old 12-19-2002, 02:52 AM   #6
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No, we used to start our aero engines backwards when they would start properly. They would idle but when you tease the throttle the engines normally kick and start running forward.
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Old 12-20-2002, 11:11 AM   #7
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Default Is the piston and sleeve in correctly


I have had Aero engines run backwards but NEVER a Car engine. Make sure the piston and sleeve are in the proper positions if you have disassembled the engine for a reason. On a HPI .15FE the notch in the sleeve lines up with the casting line on the crankcase. Most other engines have a pin to line the sleeve up.
I had an Ofna Colt .12 that the Factory had removed the pin to get the sleeve to line up properly. (shows the [lackof] quality there)
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Old 12-20-2002, 11:40 AM   #8
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yeah, i always make sure to line up the notch with the very back of the block. i line it up with the casting mark on the block. and the engine runs fine usually. just those first starts of the day it does it occasionally. it doesnt run for long like that. as soon as i touch the throttle it dies. then i get it started again and everythings fine. im not really worried about it. i was much more worried about my last problem which was annoying because it was just a few shards of plastic in the pipe the whole time. and it really ran like crap then.
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