Working of the Throttle - Sportbike Forum: Sportbike Motorcycle Forums
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post #1 of 5 (permalink) Old 09-29-2005, 12:34 PM Thread Starter
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Question Working of the Throttle

I am trying to understand how an engine works and how all teh parts work together. My question is about the speed the pistons move, or the rpm. What actaully happens from the moment you open the throttle. Please if I am wrong correct me this is what I am trying to figure out. Your throttle cable is attached to your carborator (or fuel injection system). The more you open your throttle the more air/gas mixture is let into the combustion area. This creating a larger explosion and causing the pistons to spin faster, thus a higher rpm. However if this is true wouldn't the spark plugs need to create sparks faster? How do the spark plugs know when to fire? Thanks for any help in advance.
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post #2 of 5 (permalink) Old 09-29-2005, 12:40 PM
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I'm sure you'll answer it best.

In God, we trust; all others must provide data.
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post #3 of 5 (permalink) Old 09-29-2005, 12:46 PM
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Your ignition works in sync with your RPM's in fact your ignition dictates the rpm. As your crankshaft spins it is charging the ignition system by way of a magneto or points system, etc.... this creates the spark. so it is indeed timed with the engine rpm. It can be advanced and retarded (not stupid retarded but slowed)

edited to add link:
kinda neat

Last edited by mainerdr; 09-29-2005 at 12:53 PM.
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post #4 of 5 (permalink) Old 09-29-2005, 04:01 PM
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Exactly right, when ever you here of someone refer to engine timing it is timing the spark with where the cylinder is, usually it is set to spark a bit before TDC (top dead center).
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post #5 of 5 (permalink) Old 09-30-2005, 12:50 PM
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No different to opening up the thottle of a m/c as pressing down on the gas pedal of a car/truck. So you will find the same info in the libragy.

A car/truck is self-balanced with four wheels & is partailly protected with all its coverage while a m/c only has two wheels so balance & traction is, shall we say 'on the tippy side', & the only protection to the rider of a m/c is crash helmet & other protective gear he will purchase & use constantly.

Lastly a fender-bender of one cage with the other is pretty simple & no one is hurt. The thing is who was in the wrong & does the person in the wrong carry insurance.

If it is a m/cist VS cage in a fender-bender the bike will be down & damaged a bit to a lot while in many cases the rider will be hauled off to the emergency ward of the hospital.

Last edited by Smitty; 09-30-2005 at 12:52 PM.
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