Injector Shutoff

[bobolinko]

Originally Posted by slothman86

I was sitting at school today and wondered what would happen if you could shut one of the injectors so that only 3 cylinders are operating. I dunno. I was really tired and it seemed like a good idea at the time. This could be a way to improve fuel economy even more...LOL. I think its a long shot at best.

Any thoughts?

Will cause more problems than anything else. The pistons are still going up and down, and the fuel in the cylinder will be expelled as unburnt exhaust gasses...
Stay in school, and get a complete education before you start trying to design automobiles. lol Good "idea" but that won't work for anyone's benefit.

[slothman86]

Originally Posted by bobolinko

Will cause more problems than anything else. The pistons are still going up and down, and the fuel in the cylinder will be expelled as unburnt exhaust gasses...
Stay in school, and get a complete education before you start trying to design automobiles. lol Good "idea" but that won't work for anyone's benefit.

I'm sure it'll cause problems....that's why I said it was a long shot at best, at least for our existing car. I don't think there will be any fuel injected into the cylinder because the injector will be shut off...like this...

http://en.wikipedia.org/wiki/Active_Fuel_Management or this...http://en.wikipedia.org/wiki/Variable_displacement

I was just talking about adapting this existing tech to an existing engine. I just wasn't exactly sure what it was called in the OP.

I'm not sure what you mean, of course the pistons will continue to go up and down. The yaris already has DFCO which is sorta like this.

BTW, this all started because we were talking about this existing tech, and I thought it was a good idea....but instead of deleting half the work load...only one cylinder...

[H3LlIoN]

Originally Posted by slothman86

...only one cylinder...

One cylinder wouldn't be able to handle it...you have to have enough firing to blow the crank up, then back down. Generally, it takes half of the cylinders to fire. I've had the head off a 1NZ...you could probably make this work by firing 1,3 or 2,4, since 1 and 4 are on the same stroke, and 2,3 match as well. You could test by plugging two injectors. It will throw a CEL but, if it runs at all, you at least know it's feasible. Tuning will be an issue though...you'd have to go standalone and write custom stuff.

[slothman86]

Originally Posted by H3LlIoN

One cylinder wouldn't be able to handle it...you have to have enough firing to blow the crank up, then back down. Generally, it takes half of the cylinders to fire. I've had the head off a 1NZ...you could probably make this work by firing 1,3 or 2,4, since 1 and 4 are on the same stroke, and 2,3 match as well. You could test by plugging two injectors. It will throw a CEL but, if it runs at all, you at least know it's feasible. Tuning will be an issue though...you'd have to go standalone and write custom stuff.

oh no, i mean only starving one cylinder...lol. I have a few pals at school, that have custom piggybacks that they built from scratch. Tomorrow I'll run it by them and see what they think. Thanks. Maybe the o2 sensor would see this and pour even more fuel into the remaining cylinders? Isn't that their job?

[H3LlIoN]

Originally Posted by bobolinko

Will cause more problems than anything else. The pistons are still going up and down, and the fuel in the cylinder will be expelled as unburnt exhaust gasses...
Stay in school, and get a complete education before you start trying to design automobiles. lol Good "idea" but that won't work for anyone's benefit.

Wow. You clearly have never heard of "Displacement on Demand." Then again, I guess the crazy guys over at Cadillac should have stayed in school. Also, how is fuel in the cylinder going to be expelled as unburnt gas if you shut off the injector? There wouldn't be any fuel to expel. Smooth going, ace.