Worth mentioning? gas mileage

[PDoyle]

Just tossing this out.
I'm gonna steer in another direction here. What about 6-4-2 cyl shut down or 6-4....?
Like Cadillac's blunder in the late 80's. 8-6-4
What about a way to shut down 2 cylinders at 60 mph? Electronics!

 

[inkpot]

Howdy! Well, if you just kill the ignition to two cylinders, then the fuel still goes in, and out of, the cylinders, creating a nice forest fire in your catalytic converters. IIRC, the Caddy setup left the intake valve closed, and the exhaust open, to stop fuel flow, and reduce cylinder pressure. Probably not something you could design and install at home. John

 

[sseaman]

i second that it would involve more than just stopping the spark to those cylinders

 

[dronning]

Many of todays GM & other engines that have an injector per cylinder use this method to get better mileage.

"Active Fuel Management™ deactivates half the engine cylinders when they are not needed and seamlessly reactivates them when you need the extra power."

The key is you need to be able to control the injector(s) for the cylinder(s) you want to shut down. Also these new systems rotate the cylinders being shut down and based on demand will turn them on and off in milliseconds.

Dave

 

[Hilux]

no telling what you'd have to design or program in order to accommodate the existing management system.

designing a piggy back would be money in the bank...


(that and Hydrogen assist, and a Cruiser could get into the 100mpg category )

 

[hj60]

You'd really just need to stop the signal to open the injector(s) in question.
There are DIY ECUs out there. Prolly be easier on OBDI than OBDII.
This is something I've thought about in the past as well.

 

[inkpot]

Howdy! S"pose you could just disconnect the injector harness, or rig a switch inline, remote to the dash. Would all that "clean air" from the dead cylinder(s) throw off the ox sensor so that it would try to force more fuel thru the remaining injectors? Would that setup increase/decrease the effects of compression braking? John

 

[Brian Macgyver]

You could try to re-design the EFI engine computer, devise a mechanical system to close the intake valves and turn off the spark.
Do you have a machine shop, a computer design center, and a mechanical design firm at your ready disposal? Are you smarter than all of the Toyota Engineers? If you do, then you are wealthier than most of us! Toyota spends millions every year to get more power from a drop of gas.
If you have that kind of cash, I would love to sell you Real Estate.
Toyota does have a simple system in place that shuts down two of six cylinders on weekday commutes. It also reduces maintenance on transmissions and axles in Land Cruisers. It is called the Corolla, or Camry. It is very effective! Try it sometime.