Quote:
Originally Posted by JohnAh
@theycallmeebryan: Nice to see that my crazy project can inspire! I did´t think about the possible problem with clean air being pumped and blended with the exhaust. You are probably right about the sensor reading lean mixture making the injectors dumping a lot more fuel than needed in the remaining two cylinders. Dammit! I was hoping to get a some answer about how much of the fuel savings is comming from the harder work in the remaining cylinders and how much is saved by reduced piston friction.
Is there perhaps an easy way to block the intake manifold or to disengage the valves? Don´t remember if I´ve written this before but I want to try removing all push-rods for two cylinders in my old Saab. Removing the push-rods is easy but the question is what will happen when the valve tappets get lose? Removing them is a LOT more work but perhaps they can be lifted up and locked in place by magnets or a thin strip om metal.
Doing the same trick with an OHC-engine demands most likely a destructive operation.
The test is however very interesting. If fuel consumption can be reduced by 5-10% with all piston still in place there may be a way to modify the engine so it can go from standard mode to "split-mode" while driving.
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If your motor is a pushrod engine, you could remove the pushrods, but your concern about the tappets getting loose is valid. If it's an overhead cam design, you'll have to remove the rocker arms.
Otherwise, i suppose you could remove the intake manifold and cap off the ports to the cylinders you are turning off, using a solid gasket or something.
I suspect that you could achieve a cheap conversion by correcting the A/F ratio and putting the plugs and injectors on a switch.