![]() ![]() The cylinder-shutoff mechanisms that completely shut off valves don't have an issue. The air/fuel mixture will be too lean to fire, but the fuel is still going through the engine being wasted.Īny emissions-regulated strategy that involves shutting off the fuel but not the air will screw up the operation of a 3-way catalyst. Shutting off a port injector won't because the inside wall of the intake port is wetted with fuel during normal operation, and if you leave the intake valve working, that's going to gradually get drawn in over the following (skipped) cycles. Shutting off a direct-injection injector will shut off all the fuel. ![]() The various late model engines that use "cylinder de-activation" leave the intake and exhaust valves shut, which obviously shuts off supply of all air and fuel. although the nature of operating an intake valve in this manner severely limits the RPM and operating pressure (compression ratio) of the engine. The old school hit and miss engines worked by cracking open the exhaust valve and the intake valve was purely suction operated, so it did in fact successfully shut off all fuel (and air). That depends whether you can successfully shut off ALL the fuel. ![]() RE: Hit and Miss Engine berkshire (Aeronautics) 7 Mar 17 18:05 I remember on a car some time ago where they used carbs and tried to cut off fuel on the overrun, they found when you put your foot on the accelerator it wouldn't go properly so had to actually cycle the fuel on and off when on overrun.įuel injection now, especially electronic FI, is a different thing.Īll up no one can work out why you're trying to make your engine less efficient than it is at present.Īlso: If you get a response it's polite to respond to it. If you manage to cut off the fuel, this film dries out, but then on re-start the engine coughs a lot. They usually have some sort of float system and bowl which holds enough fuel for a few seconds, so turning the inlet fuel on and off won't make any difference to the fuel out, but can affect the re-start as the bowl fills up again.Īlso systems like this actually lightly coat the inlet chamber in a thin film of petrol. Wayneoz - the issue you will face is that carburetors don't like having fuel turned on and off. ![]()
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