ORIGINAL: RLSH700
Your argument is still flawed. You said that added 4 valves per cylinder on the Hemi would help the fuel economy in a 7.0L version which is an increase from the current sizes as well; therefore, make up your mind. Whether it will improve the economy or not.
Again - two 7.0l's (hypothetical) - on a dyno - same engine - same cam - one with 2V, one with 4V...they could reap an FE benefit from the 4V if they wanted to. To make up for the increase in displacement. I don't know how else to say it.
ORIGINAL: RLSH700
Next about the 3.3L to 3.5L argument being displacement, . . . I will slam MB with pride as they are a joke when it comes to fuel economy.
And again...comparing different engine families or different vehicles is really apples and oranges. For example, I'll just point out that the impala is about 3500 lbs and the S Class is about 4500 lbs. Since the MB is ~25% heavier, are you saying the Impala gets 25% better fuel economy? Apples and oranges, but it makes the MB look more impressive, doesn't it?
ORIGINAL: RLSH700
Besides the 6.1L has managed to match the 426 Hemi according to a dyno comparison that either C&D or MT did.
45 yrs. later. Impressive.
ORIGINAL: RLSH700
I have never looked at it because quite frankly I find that to be a complete waste of my time.
Yeah, true. You can disagree with me, but you can't disagree with a book. Or maybe you can.
ORIGINAL: RLSH700
it produces less smog (10.2 tons vs. 10.8 tons) as the "clean" Mercedes 5.5L does according to fueleconomy.gov. It also earned a 7 out of ten air pollution score (the higher the better); meanwhile, the Mercedes has not even been tested yet and some other European models from BMW and Audi were tied with the Chrysler on the smog score but only had 6 out of 10 scores for the air pollution category. The extra funny part is those other engines were considerably smaller 4.2L and 4.8L engines.
I'm pretty sure nobody regulates "smog"...
ORIGINAL: RLSH700
Lear4406, although I agree with most of your point, you are techincally incorrect about pushrods being the only one that has a MDS system. Honda has already developed such as system and has implimented it on the Accord Hybrid (which has been a complete failure) and an option on their minivan. Chrysler is currently working on such a system for the new Phoenix engine which will be a multivalve OHC engine from what I have read.
Ford already has a system on their modular engines, and I think a lot of companies do. It's easier to do on OHC. But I like the rest of Lear's post.