Cylinder deactivation discussion

[dwtaylorpdx]

I've had a couple Cadillac rentals lately they use variable displacement, the CTX got a easy 32 MPG cruising at 70 to 75. The Northstar line is the followup to the failed V8/6/4 from back in the day..

They don't shut down 4 cyl or any cylinders really, they strategically skip the injector pulse in a order calculated to skip each cylinder in a manner to not un-balance the power cycle of the engine. This means that at cruise and no load it can effectively be only firing only part of the cylinders, I've heard the caddy will EOC itself on a downhill run. Its still spining but under highly reduced load. I think it even opens the torque converter lockup when coasting.

Dave

[Frank Lee]

That isn't how DOD works.

[rbtree]

Hey Frank, and others, now Doug Palmear is claiming his invention is a hybrid, AND he can deactivate up to 7 of 8 cylinders? Is he still full of horse manure?

http://ecomodder.com/forum/137482-post72.html

[Frank Lee]

With only two batteries! He must have filled them with E85 to create super-batteries???

[rbtree]

I read up a bit on cylinder deactivation, and perused this thread. The concept is interesting, but doesn't sound simple. I fail to see how Doug could choose how many cylinders to use.......say from just one all the way to 8......

And I learned that spiral core batteries are nothing but a better lead acid battery..... He'd need a ton of them to achieve the voltage needed to help boost the fuel economy as high as he's been touting....

[diesel_john]

Is he still full of horse manure?


Horse manure may be the answer.

% eff.? % eff.? % eff.?
E85->fuel cell->lectric->var. freq. drive->direct drive motor

engine sound generator and speaker, no engine.

[rbtree]

This blogger reports from SEMA..... My comments in italics

Truth with Speedzzter (including commentary on Ford Motor Co.)


LAS VEGAS -- At the 2009 Specialty Equipment Market Association Show, HP2g.com released more details about its revolutionary 110 m.p.g. electric hybrid V8 Ford Mustang. Doug Pelmear’s innovative 4.8 liter V8 engine uses electronically-managed variable displacement and an integrated pulsed electric motor to vary output for conditions and power demand. The naturally-aspirated HP2g engine can produce as much as 400 horsepower and 500 lbs/ft of torque during acceleration and as little as 15 horsepower during part throttle cruise conditions. The engine is computer managed.

The revolution in HP2g’s powerplant is three-fold. First, according to HP2g’s press release, “[T]he HP2g E-85 fueled engine can transition from running on all eight cylinders down to firing on just one.” Unlike conventional variable displacement systems now in production, the HP2g’s engine rotates the single active cylinder among the eight using a proprietary process.

Love to see everyone's comments on that, and below as well

Second, HP2g reportedly has integrated a unique electric motor which operates “on a pulse basis, instead of what is called full saturation.” HP2g uses rapid electric cycling to conserve electric energy. The integrated motor also reportedly employs regenerative braking. The battery pack for the pulsed electric motor is reportedly two racing spiral core gel batteries.

wouldn't that be 24 volts? Far from what's needed to supply much power assist, right?

Third, HP2g has discovered “added efficiencies because of tight tolerances and sturdy design.”

Cool, that might give another what, 3-5% gains?

[diesel_john]

so he has 8 one cylinder engines...
aren't most variable drives pulse drives now...
and he burns E85 at 100% efficiency...

[OrionNav]

My '03 Ford Focus (2L DOHC) has 275,000 miles on it, and compression in cylinder 4 is shot. I can often smell the unburned fuel coming out of it. Surprisingly, the engine still has enough power to meed my needs. Is there an easy way to shut off fuel to that cylinder? This engine is already running a little rough, and I don't expect that would get worse from shutting off a cylinder that's not burning its fuel anyway.

I'm not looking to do anything fancy, like reprogram the engine control chip. I'd just like to get about another 2 months' use out of this car, without smelling fuel.

My skill level is not very high. I'd be able to install a switch to disable the fuel injector, if I could find good instructions about how to locate that wire. Anything more, forget it.

[Frank Lee]

Pull the wire off the injector. Ignore the CEL, or put a resistor on that injector plug to fool the ECM.