Is it possible to push start an auto?
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04-04-04, 10:53 AM
#9
block-spike
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Doesnt an auto tranny work on hydraulics and vacuum? Thus no vacuum from Idle no engagemnet of the gears. Yeah you can select drive but it will do nothing.
Atleast that was always my understanding of the autotranny, and I could be wrong, but I had a friend who would always put his auto into neutral when going down hill....thought it saved gas, which it doesn't, anyway he would push it forward and hit rev sometimes stalling the engine. He tried a couple time to kick start it by putting it in drive but it just coasted like it was still in neutral.
Atleast that was always my understanding of the autotranny, and I could be wrong, but I had a friend who would always put his auto into neutral when going down hill....thought it saved gas, which it doesn't, anyway he would push it forward and hit rev sometimes stalling the engine. He tried a couple time to kick start it by putting it in drive but it just coasted like it was still in neutral.
04-04-04, 11:43 AM
#10
Super Snuggles
You can't compression start an engine with an automatic transmission. Why? Because the torque converter in an automatic is not a mechanical connection to the engine and the hydraulic coupling of the converter only works from the engine to the transmission, not the other way around. Neutral obviously wouldn't work at all, but even in the forward gears, you won't get the engine to turn over.
If you want to test the theory, put an automatic car in a forward gear and raise the hood, then have a couple friends push the car. Note that the pulleys and belts on the front of the engine aren't turning. Try the same with a manual transmission in gear and you'll notice that the engine accessories turn because there's a direct mechanical connection from the tires to the engine through the clutch. You'll also notice that it's a lot harder to push while in gear. Guess why.
If you want to test the theory, put an automatic car in a forward gear and raise the hood, then have a couple friends push the car. Note that the pulleys and belts on the front of the engine aren't turning. Try the same with a manual transmission in gear and you'll notice that the engine accessories turn because there's a direct mechanical connection from the tires to the engine through the clutch. You'll also notice that it's a lot harder to push while in gear. Guess why.
04-04-04, 12:22 PM
#12
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that's why you need to get a lot of force to push it but it can be done. I have done it a couple of time. I don't know about newer cars thou but like 80's car you can did it a lot on my 86 VW. take a auto car on the highway and turn it off in gear, then turn the ignition and the car will start right up. is kind of the same principle.
04-04-04, 01:24 PM
#13
Super Snuggles
Originally posted by hondasr4kids
I have done it a couple of time. I don't know about newer cars thou but like 80's car you can did it a lot on my 86 VW. take a auto car on the highway and turn it off in gear, then turn the ignition and the car will start right up. is kind of the same principle.
I have done it a couple of time. I don't know about newer cars thou but like 80's car you can did it a lot on my 86 VW. take a auto car on the highway and turn it off in gear, then turn the ignition and the car will start right up. is kind of the same principle.
04-04-04, 01:53 PM
#15
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Originally posted by hondasr4kids
........ take a auto car on the highway and turn it off in gear, then turn the ignition and the car will start right up. is kind of the same principle.
........ take a auto car on the highway and turn it off in gear, then turn the ignition and the car will start right up. is kind of the same principle.
Secondly: - The principle(s) you address are not a good comparison. ANY vehicle can be turned off and re-started ( with key engagement) while in motion, as long as all the ignition components are working properly and the vehicle is in nuetral ..(or clutch depressed).
And Thirdly: - Automatic transmission/drivetrain components can not transfer torque or compression back towards the engine because of the Torque Convertor.
04-04-04, 04:13 PM
#16
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Originally posted by hondasr4kids
.....take a auto car on the highway and turn it off in gear.......
.....take a auto car on the highway and turn it off in gear.......
If you do this, you'll lose all power steering and possibly lock the steering wheel. You will also lose your power brakes,... until [IF] you're able to fire the engine up again,...SO DON'T DO IT!!.
04-04-04, 04:38 PM
#17
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Originally posted by areXseven
One more [pretty important] thing.,
If you do this, you'll lose all power steering and possibly lock the steering wheel. You will also lose your power brakes,... until [IF] you're able to fire the engine up again,...SO DON'T DO IT!!.
One more [pretty important] thing.,
If you do this, you'll lose all power steering and possibly lock the steering wheel. You will also lose your power brakes,... until [IF] you're able to fire the engine up again,...SO DON'T DO IT!!.
04-04-04, 04:42 PM
#18
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Originally posted by XSTransAm
i accidentally did this once in my trans am, talk about ******* scary, I dont remember why i turned it off but im sure i had a legitimate reason to do so.
i accidentally did this once in my trans am, talk about ******* scary, I dont remember why i turned it off but im sure i had a legitimate reason to do so.
04-04-04, 07:24 PM
#19
addicted to lounge
why do you ask? planing on stealing an auto rx 7 anytime soon?lol.
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