      Does this mean we are wrong? First of all, there's no doubt the engine was running in the opposite direction. What else could it have done? Did you read my post? I was there. If the truck is moving forward in reverse gear with the clutch out, the crank has to be rotating backwards. It was doing all this, AND it was firing. Secondly, I'm not a mechanic, but I do have a very basic understanding of how an engine runs. And it seems to me, in my simple mind, if it's rotating backwards, then the timing would also be backwards, so it should fire.But as I said, it did stutter and stammer and finally die after sitting in neutral for about ten secs. He didn't doubt my story at all, and said he knows of old boat engines in the 20s and 30s that would sometimes, if the flywheel was positioned at just the right spot, it would start, then compression would force it back, and those engines would sometimes continue to run rotating the wrong way.You had to then shut it down and restart. But he never heard of it happening in a modern engine. No homo but that's why I don't mess with standards.Especially with these hills 'round here in Seattle. All automobile engines are four stroke engines well, not all, but the one you are talking about is since you are not talking about a rotary or a diesel.In a four stroke engine, the piston goes through 4 stages. Now, here is why it is impossible. If your engine was running in reverse, the engine would go through the following sequence. Do you see the problem? Your combustion stroke comes directly after your exhaust stroke, so you have no fuel mixture in the chamber for ignition. In essence, you fill the chamber, exhaust it and you go through one cycle of nothing.What was most likely happening to you was that your car "running rough" was your clutch plate getting grown down to nothing. Moving in reverse would want to cause the engine to move in reverse, but of course, it would not run, so it would either strip out the gears in your transmission or go to the weakest part of your drivetrain, which is your clutch.You probably burnt the crap out of your clutch, and that is what caused the car to "run rough" and blow apart your vacuum system. Either way, you can not run an engine in reverse, it is physically impossible to do so because of what I just mentioned. A boat engine is a 2 stroke engine, and it is a completely different setup then on a modern gasoline engine. A boat engine CAN run in reverse. I also want to add that I have an advanced degree in mechanical engineering, so I know what I am talking about.I have been around engines my entire life, rebuilt them from the ground up, bored out cylinders, and done just about every mod imaginable. I am not trying to show you up by any means, but instead just telling you that what you think happened did not actually happen. It gives you a little bit more knowledge in the inner workings of engines, and hopefully you appreciate it when you learn something new.If you want to know why a 2-stroke engine boat outboard, lawnmower, weed trimmer etc CAN run backwards, I can answer that as well for you. When a 4 stroke engine is running, the piston is moving up and down like this: It moves up.Then it moves down. Then it moves up. So, if the crankshaft is turning clockwise, the piston moves like this: It moves up, then down. Then up, then down. If the crankshaft is turning counterclockwise, the piston moves like this: It goes up, then down.Either way the crank rotates, the piston goes up, then down. Doesn't matter which way the crank turns. Am I right? Your idea that the engine was strong enough to grind the steel in my clutch plate all the way down that hill rather than stall out is interesting, but not really realistic, is it?Besides, if it did that, I would have smelled burning steel. My engine is a VVT-i engine. Maybe this explains the difference between your argument, which I think is in regards to a purely mechanical engine, and this one. In a conventional engine, the valve timing is fixed at a compromise setting, which is applied to different driving conditions - from idle through to sporty driving. However, with VVT-i, inlet camshaft timing is varied according to your needs.This may explain why my engine was able to run in the wrong rotation: The computer made adjustments in the inlet camshaft timing which enabled the engine to run. Then it finally stalled. When I started it back up in the correct rotation, it still ran rough. The service manager ran the codes and told me it was running lean due to the vacuum hose that had come off. They purged the system, reconnected the hose, reset the codes, and I am good as new.Wait a minute, Chom you're a gear head? I see you in a totally different light. Major cool points. Being a bit of a gear head myself I don't see anyway possible for an engine to run backwards.Impossible if you ask me. I do have a good story though. A guy driving a dodge mini-van pulls up in front of my building one day on base, this was about 10 years ago. Van is running like crap, knocking, sputtering, smoke bellowing out of it. He turns it off and jumps out saying it wouldn't shut off.I told him to pop the hood so I could take a look. By this time this van sounded like it was about to explode, the entire van was shaking. I immediately started pulling wires trying to get this thing to shut off. The ignition was off, I pulled positive battery wire, coil wire, plug wires everything, damn thing was still running. Then I noticed the exhaust manifold was glowing a red color. It was so freaking hot because of a blocked up catalitic converter it was igniting fuel in the cylinder causing the engine to keep firing.Active Oldest Votes. Improve this answer. Essentially a differential where the input shaft is locked. I know how a car's differential works, and even so I read your last line as "limited-slip differential," which of course has both shafts rotating in the same direction.Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Does ES6 make JavaScript frameworks obsolete? Podcast Do polyglots have an edge when it comes to mastering programming Featured on Meta. The torque becomes smaller when increasing speed and becomes larger when decreasing.This point will be explained in the next chapter. Therefore, the speed of a small output power of a motor is decreased with gears to produce larger torque in most cases. Many geared motors are used in automotive parts, home appliances, and motors of industrial machines. Figure  Figure : Mechanism of geared motor.Rotational number of gears depend completely on the number of teeth of meshing gears and is transmitted as calculated. Calculate rotational number and rotational direction of the driven gear gear A.Symbol in Figure represents the drive gear. Calculate rotational number and rotational direction of the driven gear gear B.Calculate rotational number and rotational direction of the driven gear gear C. These calculations become increasingly cumbersome as the number of gears increases. Figure Figure Speed ratio calculation of a single stage gear. No problem!  

Which gear is turning in the wrong direction

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