you know what really grinds my gears?
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38 comments displayed.
#4
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firehippie (10/03/2015) [-] 
you know what grinds my gears? Nothing, my car doesn't shift. I find this stuff really interesting. It's neat to see how things work
#15 to #7
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anon (10/03/2015) [-]
I'd log in but my phone won't let me. Anyways my car is a 1963 buick lesabre with a 401cu in v8. The transmission is called the twin turbine dynaflow. What it does it relies only on the torque converter to do all the ratio changes from 3.40:1 all the way done to 1:1 and anywhere in between depending on what's needed. So in that effect it's a cvt. The dynaflow came out in 48 and went through many improvments until it went away after 1963.
#10 to #7
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deathhelmet (10/03/2015) [-] Having hippie in his username hazards me to guess either none, to save some
pollution, or an electric car, which doesn't need a gearset. Although electric cars still
cause pollution because public utilities burn coal to make juice for the grid, but that's
everyone's business since this blue marble is getting too damn hot.
pollution, or an electric car, which doesn't need a gearset. Although electric cars still
cause pollution because public utilities burn coal to make juice for the grid, but that's
everyone's business since this blue marble is getting too damn hot.
#60 to #16
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deathhelmet (10/05/2015) [-] umm, lol? it still shifts, he just might not control it. automatic trans can still grind if they are running ****** .
#40 to #14
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jackledead (10/04/2015) [-] >Getting finger hair stuck in there
>Running hands through hair
Ow
>Running hands through hair
Ow
#42
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jokexplain ONLINE (10/04/2015) [-] mechanicexplain, how does fuel injection and timing work in a rotary engine?
#49 to #42
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undeadmaus (10/04/2015) [-] I don't know the specifics but looking at this image I would imagine there's something like a circular crankshaft at the center. Those silver rods are what are controlling the valves.
#59 to #42
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mechanicexplain (10/04/2015) [-] The ignition timing is controlled in pretty much the same way it is for any other vehicle, with a base timing and a mechanism or electronic input that adjusted timing based on load and engine speed. Considering the fact that there was no camshaft to keep in-time with the crankshaft, it was actually a lot easier to keep the ignition on time, and they almost never needed adjustment. Fuel, however, is entirely different.
Up until they discontinued the RX-8, Mazda rotary engines had constant changes and tweaks done to their fuel delivery systems, usually due to high emissions. In order to keep the apex seals on the tips of the rotor from burning up, fuel and oil are both injected into the engine, and the fuel is injected from 2 sets of injectors offset into different parts of the intake manifold. Since whichever face of the rotor is facing the intake orifice is under vacuum at any given time, there's no need for a valve to close it off, so the injectors fire near constantly, and the amount of time and which set of injectors is opened is changed depending on engine speed and load.
Same for the exhaust, as well. Whichever rotor face is closest to it is always going to be expelling exhaust gasses, so there's no valve to close it off. It just free-flows.
Up until they discontinued the RX-8, Mazda rotary engines had constant changes and tweaks done to their fuel delivery systems, usually due to high emissions. In order to keep the apex seals on the tips of the rotor from burning up, fuel and oil are both injected into the engine, and the fuel is injected from 2 sets of injectors offset into different parts of the intake manifold. Since whichever face of the rotor is facing the intake orifice is under vacuum at any given time, there's no need for a valve to close it off, so the injectors fire near constantly, and the amount of time and which set of injectors is opened is changed depending on engine speed and load.
Same for the exhaust, as well. Whichever rotor face is closest to it is always going to be expelling exhaust gasses, so there's no valve to close it off. It just free-flows.
#46
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undeadmaus (10/04/2015) [-] Does anyone have one for single piston engines? I get how multi piston engines work since not all pistons can be up at the same time, the reaction from one piston pushes the others up, but what makes a single piston engine compress? Where does it get the energy for that?
#23
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hairybaboon (10/04/2015) [-] 
Seeing the planetary gear set reminds me of this thing I designed a few years ago for school. You get mechanical advantage, but also have to pedal backwards.
Seeing the planetary gear set reminds me of this thing I designed a few years ago for school. You get mechanical advantage, but also have to pedal backwards.
#56
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meambob (10/04/2015) [-] apparently there's actually been cars made with a wankel engine
en.wikipedia.org/wiki/Mazda_RX-7
en.wikipedia.org/wiki/Mazda_RX-7
#51
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anon (10/04/2015) [-]
wouldn't the "wanket engine" get super worn out really fast? Like rounded off and killing the engine
#44
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koshmiester (10/04/2015) [-] im pretty sure the one you liked is a juke engine, and there is a plate on top of the pistons with an injection and exhaust port. as the pistons rotate the fuel gets injected, then compression, explosion, exhaust etc.
