Thread: One Particular Question on Valve Lash

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You can do it any of a several different ways, but I wrote this tutorial for the Crankshaft Coalition wiki and this is the way I do it. All who have tried it say it is the most accurate they have ever tried....And after all, we're not after quick and easy necessarily, but we are after accurate....
http://www.crankshaftcoalition.com/w...stment_SBC/BBC

What Vizard is referring to is companion cylinders. Looking at the firing order 1-8-4-3-6-5-7-2, you can see that when #1 is on compression stroke with the piston at top dead center, #6 will be on overlap stroke with the piston at top dead center. When #8 is on compression stroke with the piston at top dead center, #5 will be on overlap stroke with the piston at top dead center. When #4 is on compression stroke with the piston at top dead center, #7 will be on overlap stroke with the piston at top dead center. And when #3 is on compression stroke with the piston at top dead center, # 2 will be on overlap stroke with the piston at top dead center.

There are 720 degrees of crankshaft rotation for a complete 4-cycle burn to take place for any one cylinder, so each companion cylinder is 360 degrees apart from its companion.

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