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nkaminar · 01-02-2021, 09:07 AM

Sparky said this but here is my explanation.

Firing order: The two center pistons (2 and 3) go up together and two outside pistons (1 and 4) go up together. So when #1 is firing, #4 is up and switching from exhaust to intake stroke. And 360 degrees later the opposite is true. So if you look at the firing order as numbers on a circle rather than in line, you can see that #1 fires opposite #4 and #2 fires opposite #3, etc. The circle represents 720 degrees of engine rotation and the firing of the pistons are separated by 180 degrees. The #1 and #4 and the #2 and #3 are separated by 360 degrees. Hope this helps.

01-02-2021, 09:07 AM	#10
nkaminar Senior Member Join Date: Jan 2012 Location: Western North Carolina Posts: 3,900	Re: (Yet Another) Electrical Question Sparky said this but here is my explanation. Firing order: The two center pistons (2 and 3) go up together and two outside pistons (1 and 4) go up together. So when #1 is firing, #4 is up and switching from exhaust to intake stroke. And 360 degrees later the opposite is true. So if you look at the firing order as numbers on a circle rather than in line, you can see that #1 fires opposite #4 and #2 fires opposite #3, etc. The circle represents 720 degrees of engine rotation and the firing of the pistons are separated by 180 degrees. The #1 and #4 and the #2 and #3 are separated by 360 degrees. Hope this helps. __________________ A is for apple, green as the sky. Step on the gas, for tomorrow I die. Forget the brakes, they really don't work. The clutch always sticks, and starts with a jerk. My car grows red hair, and flies through the air. Driving's a blast, a blast from the past.