no what i mean is in what order do the cylinders fire. i know one of the coils fires 1 and 4 and the other coil fires 2 and 3..what i need to know is what order it does this in. some motor fire in a 1,4,2,3 pattern some fire another way. just like a car motor the rotor goes around the distributer cap firing cylinders in a certain order. i dont see why this motor isnt alike. and im wondering the order since i bought aftermaket coils and want to make sure that i have them right.
There are only two things I really love to grab a handful of...one of them being the throttle on my R1!!
Do you know why you can't find the firing order?
Because 1 and 4 fire at the same time. 2 and 3 fire at the same time.
I don't have a manual in front of me, but I bet if you look at the valve adj. procedure you will see that if you bring no. 1 up to TDC compression that you can also check the clearance of the intakes for no. 4 . That is because when no. 1 is at TDC compression stroke, no. 4 is at TDC exaust.
Check your other sources, Scott. I'm betting they are going to tell you the same thing.
If cylinders 1 and 4 fired at the same time, they both would be at TDC in the compression stroke at exactly the same time. One would not be in the compression stroke and the other in the exhaust stroke.
Also, the bike would sound like a twin if cylinders 1 and 4 fired together and cylinders 2 and 3 fired together. It doesn't so they don't.
Now, on the pre-2002 R1's, since the spark plugs for 1 and 4 are on the same coil, the plugs fire at the time. But that does not mean the cylinders fire at the same time. Big difference!!!
Originally posted by YamRZ350 There still is not a firing order like in a car with a distributor. A COMBUSTION order maybe, but a firing order no.
No, the standard terminology really is "firing order".
Industry standard terminology.....ask any engine designer the firing order of his engine and he will know exactly what you asking. I don't care if it a car engine or a motorcycle engine. I don't care if uses a distributor or not.
Not flaming, just curious. Not a motorcycle mechanic, but pretty familiar with the autos. How is 000 and 360 not the same? Same question with 180 and 540? Now, IMHO the difference would be that it takes two complete revolutions to complete the compression/exhaust cycle for each cylinder. Is that true? If so, can you explain how that is possible. I'm trying to picture in my head the cam shaft that would produce that effect.
Originally posted by mshumake Not flaming, just curious. Not a motorcycle mechanic, but pretty familiar with the autos. How is 000 and 360 not the same? Same question with 180 and 540? Now, IMHO the difference would be that it takes two complete revolutions to complete the compression/exhaust cycle for each cylinder. Is that true? If so, can you explain how that is possible. I'm trying to picture in my head the cam shaft that would produce that effect.
As far as the crankshaft is concerned, 0 and 360 degrees are the same. And so are 180 and 540.
But the cams spin at half the speed of the crank so it takes 720 degrees of cranks rotation to match 360 degrees of camshaft rotation.
The 4 stroke has 4 strokes ie piston goes up down up down and crank turns twice for each power stroke. Suck squeeze bang blow is the easiest way to remember it ie intake compression power and exhaust strokes.