Quote:
Originally Posted by bishopts
So the way emissions works is, emissions is a byproduct of burning fuel.
If you increase the amount of air (adding displacement) you have to add fuel. Otherwise you will have an incorrect air to fuel ratio. So more air = more fuel = more emissions.
You can do fun things like turn off half your cylinders to reduce your displacement to reduce emissions. And it might work correctly somtimes.
If you want an LT2 to get better emissions the it can be done. Sacrifice displacement by running an even more aggressive DoD system, and change the tune. It's not rocket science.
If you wanted to turn a LT2 into a 6.7 then just shorter rods and longer throw crank and you do it. Compression ratio will follow it, its just engine math. Peak power rpm will follow cam and intake design. Stroker engines usually make their power sooner in the rpm vs the square counterpart.
If they were trying to meet emissions standards they would have made the engine smaller. not bigger. Now if you said they are trying to stay competitive and one up the last engine in power but needed a new fueling option to achieve the goals. Then i would believe that.
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Compression is another way to lower emissions I believe. Having dual injection can probably help in that regard as well. Whether that's right or wrong, I can say with 100% certainty that this new motor came out for emissions purposes as new emissions rules are set to go into affect. Maybe I'm using the wrong term in "emissions" and the engine was created to assist hitting fuel economy targets instead. Whichever of the two it is, this engine is coming out to hit those targets.
Displacement alone does not determine emissions efficiency. I'd be willing to bet my life that the current 6.2 liter LT1/2 is a far more efficient and emissions friendly engine than the 5.7 Liter LS1.
GM a few years ago invested 900+ million dollars in developing a new gen VI engine to meet the upcoming more stringent standards. The LT2 already surpassed its competition. This new engine is just icing on the cake. Others have mentioned somewhere in this thread (or another one regarding just this engine) that this engine was specifically developed for the upcoming emissions/fuel economy standards.
Before anyone says it, it does not matter that the current admin rolled back the standards. Manufactures know that the next admin will put the more strict emissions in place + they sell cars in other parts of the world as well.
Again, I may be meaning fuel economy instead of emissions, but you get the point. GM (and everyone else) had to hit these targets. Ford's Gen IV coyote was also developed to hit them, it just happened to come out a little sooner. Curious if that filter that's in the Coyote intakes will be in this engine as well.