Quote:
Originally Posted by Frank Lee
el: dozens have tried the injector cut-off, and failed. Dozens more will try it again in the future... and still fail. The reasons why it doesn't work have been discussed. It revolves around pumping losses... always has. If a simple injector cut-out worked, everything would have displacement on demand since the late '80s. The pumping losses have to be reduced for this thing to work, either as a permanent conversion or as a dod setup. That means no air in/out of the cylinder.
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That's why I recommended only interrupting the injectors for his early testing. It doesn't sound to me like he wants to make any major alterations to the engine, and installing a break on those is pretty cheap and easily reversed.
If I really wanted to make a 4 into a 2, I'd want to change out the crank to a completely custom jobbie that only had the two middle throws, eliminate a lot of reciprocating mass/off center mass. Remove all the hardware for the outer pair of cylinders: pistons, rods, valvetrain, etc. I supposed a good machine shop could modify a crank for me if I wanted, cut out the extra throws and replace with straight stock. The cost gives me the shudders.
But once all of that work is done, wouldn't it have been cheaper/faster to build an adapter to run a nice, big motorcycle twin? Somebody's already done all the engineering, it's lighter to start with, and then you'd still have your unmodified 4 to bolt back in if you wanted to.