How difficult is it to crank a modern engine manually?

[imported_goku]

How difficult is it to crank a modern engine by hand? I heard that in the old days that people would break their arms trying to crank an engine, why is that? How difficult would it be to crank the engine with your legs? How much torque does it require to crank an engine? Something like 100lbs or 200lbs of torque, right?

 

[Shawn]

go ahead and try it.

 

[Iron Woode]

is there a point to this thread?

 

[imported_goku]

Well I had an idea that you would basically put a bicycle pedal of some sort in the car so that if the battery was dead, you could basically crank the engine your self from within the car..

 

[PHiuR]

yeah, it's called pop-starting your car.

 

[XJustMeX21]

lock in 5...4...

 

[Shawn]

Originally posted by: PHiuR
yeah, it's called pop-starting your car.

I started my car by rolling it before. was pretty damn cool.

 

[imported_goku]

Originally posted by: PHiuR
yeah, it's called pop-starting your car.

You can't do that under two circumstances.

1. If you're on level ground.
2. If you've got an automatic.
3. If you don't have balls.

 

[XJustMeX21]

Originally posted by: goku

Originally posted by: PHiuR
yeah, it's called pop-starting your car.

You can't do that under two circumstances.

1. If you're on level ground.
2. If you've got an automatic.
3. If you don't have balls.

Or if your sitting at your computer 24 hours a day making stupid posts every 5 minutes.

 

[Suspicious-Teach8788]

Originally posted by: XJustMeX21

Originally posted by: goku

Originally posted by: PHiuR
yeah, it's called pop-starting your car.

You can't do that under two circumstances.

1. If you're on level ground.
2. If you've got an automatic.
3. If you don't have balls.

Or if your sitting at your computer 24 hours a day making stupid posts every 5 minutes.

bingo!

 

[OOBradm]

according to my calculations, it would take 1.5 man watts to power an engine for an estimated time of 5 seconds, notwithstanding any air resistance or fatty resistance

 

[Ronstang]

Originally posted by: Iron Woode
is there a point to this thread?

I am not convinced there is even a point to goku.

 

[yhelothar]

The way to crank an engine by hand is the roll start.
You push the car to build kinetic energy.
You press the clutch and put it in first gear, or reverse if you're going in reverse.
If your car is moving fast enough, you drop the clutch. The kinetic energy of the clutch spinning in first gear will crank start the engine by applying torque to the flywheel.

 

[bobsmith1492]

Unfortunately, this only works if your battery is charged enough to charge the fuel injectors; otherwise, you're sitting dead in the water. That's just from personal experience, though...

Maybe you just need a HUGE amount of energy to fire up the alternator, start the car's computer, start the fuel pump, charge the injectors, start the spark, and go from there?

 

[Zolty]

If you actually want to test this lift your manual transmission car off the ground to a comfortable level, remove one of the drive tires. Now you will want to fashion a lever or crank on to that drive tire and crank away, if you think it is easy then you haven't put the car into first, you need to do that.

 

[XJustMeX21]

Originally posted by: Zolty
If you actually want to test this lift your manual transmission car off the ground to a comfortable level, remove one of the drive tires. Now you will want to fashion a lever or crank on to that drive tire and crank away, if you think it is easy then you haven't put the car into first, you need to do that.

Yes and if buy some means it starts, keep a firm hold on the crank.

 

[EarthwormJim]

I doubt it would be any harder to crank a modern compared to an older one, if there was a hand crank implemented. In fact when on a lift and my car is in 1st I can crank the engine with as little as 50 ft-lbs.

Modern engines are much lighter and have lighter rotating components.

People broke their arms in the past from kick back. If you don't remove your hand fast enough when rotating the crank, it'll hit you very hard once the engine starts.

 

[blahblah99]

If you remove the spark plugs, you can hand crank the engine with a ratchet.

 

[ForumMaster]

why would you do that? why not simply use cables to start the engine like any other sane person would?

doh, i answered myself.

 

[Colt45]

Originally posted by: blahblah99
If you remove the spark plugs, you can hand crank the engine with a ratchet.

Even if you don't remove the sparkplugs you can crank it with a ratchet. just not as easy

 

[DaTT]

Originally posted by: XJustMeX21

Originally posted by: Zolty
If you actually want to test this lift your manual transmission car off the ground to a comfortable level, remove one of the drive tires. Now you will want to fashion a lever or crank on to that drive tire and crank away, if you think it is easy then you haven't put the car into first, you need to do that.

Yes and if buy some means it starts, keep a firm hold on the crank.

You know...for someone who thinks this thread will be "locked in 5...4..." and who thinks this "a stupid post"...this is your 3rd reply, why bother coming in?

 

[DaTT]

Originally posted by: goku
How difficult is it to crank a modern engine by hand? I heard that in the old days that people would break their arms trying to crank an engine, why is that? How difficult would it be to crank the engine with your legs? How much torque does it require to crank an engine? Something like 100lbs or 200lbs of torque, right?

It wasn';t the trying to crank the engine that did it......it was the kick back when the engine started.

 

[XJustMeX21]

can't sleep and its good entertainment.

 

[exdeath]

Uhm people broke bones once the engine started and they didn't let go of the crank -_-;

Modern engines use much higher compression ratios along with electronic fuel injection, etc. Without a battery charge you would have to turn the engine over by hand fast enough to get the alternator going, and that I don't think is possible.

Physically it doesn't take much to turn, and certainly much less with a large crank and possible gearing.

Just sticking a ratchet on the crank pully nut is sufficient to physically turn the rotating assembly, and is done often when pulling out flywheel or clutch bolts one at a time from under the car, etc.

 

[lupi]

Originally posted by: DaTT

Originally posted by: XJustMeX21

Originally posted by: Zolty
If you actually want to test this lift your manual transmission car off the ground to a comfortable level, remove one of the drive tires. Now you will want to fashion a lever or crank on to that drive tire and crank away, if you think it is easy then you haven't put the car into first, you need to do that.

Yes and if buy some means it starts, keep a firm hold on the crank.

You know...for someone who thinks this thread will be "locked in 5...4..." and who thinks this "a stupid post"...this is your 3rd reply, why bother coming in?

:laugh: