Death of the V8 & birth of a.... Inline 6?

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mikeru

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The I5 Configuration is the smoothest running, least vibration configuration design.
Not sure I'm buying that one. The straight-six is Inherently balanced, which makes for a very smooth running engine. The layout combined with its firing order leads to essentially the smoothest engine out there.
 

Jim S

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I'm gonna show my ignorance on this one...but I do have a POV on it. First, I haven't even kept up and am not familiar with the "new" I6 (been busy with the project truck). Second, though, is that I've owned a long succession of Ram (before they were called Ram) and Jeep products, all of them used to the draconian max in 4x4 environs. I think my point is that, if the new I6 reflects the design and QA elements of the long-time Jeep I6 motor (that you can't get anymore), then I'm in. That 4L MPFI I6 from Jeep would run forever, was (IMHO) a blessing to work on, and maybe has spawned a new/advanced generation? Oh...and if I'm all wet...a la Roseanne Rosanadana...never mind! :cool:
That 4l inline I6 from Jeep is an American Motors engine that powered the Gremlin, Hornet, and Pacer.
 

HEMIMANN

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An I5 is inherently unbalanced, as is a V10. Both need counterbalance shaft(s). If you want to know the primary modes of unbalance, I can look that up for you. My son has the 3.7L I5 in the old Chevy Colorado. It runs fine, and sounds weird, of course.

The I6 is the most inherently balanced reciprocating engine. It has a small 3rd order vibration that is usually not noticeable, so requires no counterbalance shaft(s). The I4 has a large 2nd order vibration that requires counterbalance shaft(s). The v8 does not require counterbalance in the odd firing configuration, but does in the even fire configuration (race cars).

Anyway, you get the idea. This stuff is all google-able, it was in my textbooks before google was invented.
 

TestPilot57

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I will never believe that anything less than 8 cylinders are good for the work that a truck does. Towing, hauling, what have you.
In general, for a gasoline engine, I would agree with you. But do you have any idea how many Real Trucks are out there (class 6-8) running 6s? Pulling 80K and beyond.
 
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TestPilot57

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inline 6 turbo makes more power... gets better mileage... weighs less also... I dont see a problem... I mean the only issues is you can't go "its got a hemi in it!"... at the stoplight... thats about it, and thats an old commercial :) they should have called it a Hemi though of some sort :) Even if it isn't... marketing lies all the time..
Why isn't it a Hemi? That only refers to a superior combustion chamber design. Did they throw that out the window in lieu of....?
 

Regcabguy

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Which V6 are you referring to? Maybe it's a typo in your thread title. Everything I've read is saying the Hurricane inline 6 will be replacing the Hemi V8 in 1500's, not a V6.

There have been threads already, discussing this exact thing. Opinions have been very mixed as you can imagine. I'm of the opinion that substituting a smaller displacement forced induction engine to do the work of a larger displacement V8 is inadvisable. That a smaller engine will wear itself out faster than the V8 it's replacing. But that's my opinion. I hope I'm eventually proven wrong on that, because the Hurricane seems like a powerful, smooth running engine.
Inline engines last longer than a V configuration. The Cummins and Ford's 300cu inline six come to mind.
 

HEMIMANN

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Why isn't it a Hemi? That only refers to a superior combustion chamber design. Did they throw that out the window in lieu of....?

Superior combustion chamber design only above 5,000 rpm or so.
Since this is a truck forum, not too many users expecting to race routinely, I'd say.
Hemi was used to win NASCAR - not tow the car trailer.
 

rneal55555

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SO what part of Capitalism working includes tax credits. I have solar on my roof and wothiut the 30% Federal Tax Credit and the $2500 I got from the state it would be a money loser even in the high electric rate northeast.
 

HEMIMANN

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I wonder why a lot of Japanese bikes went to a V configuration if inline is so superior.

Inline is only superior for high torque @ low rpm. The rigidity of the load path combined with inherent reciprocating balance is an unsurpassed configuration for diesel.

V engines are for compactness and high rpm, so for high horsepower - not high torque.

Glad I didn't have the money to afford a Honda Magna back in the day. I might be dead.
Btw, Harley gets low torque from twin V by sheer displacement. My 107 cid is app. 1750cc.
 

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I think it is time to think about the evolution of how the USA has mandated
emissions. I had a 1973 350 in a Chev. that had a smog pump and related
plumbing. Through the 70's to the 90's this was an issue. That made a 300 HP engine into a 150 HP version. This is not news.
It is better to have a 6-cylinder, free breathing turbocharged engine, than a
more smogged down V-8 when emissions matter.

We had an officers DPS cruiser for the agency I worked for in Tx. That 4.6 PI without all the smog stuff in that Crown Vic would scare you how fast that cruiser could accelerate.
 

Tim7139

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SO what part of Capitalism working includes tax credits.
Seems a large part of capitalism is tax credits. Type in an industry and add tax credit and the results often surprise people.

An example for "us oil and gas tax credit"
"When it comes to tax-advantaged investments for wealthy or sophisticated investors, one commodity continues to stand alone above all others: oil. With the U.S. government's backing, domestic energy production has created a litany of tax incentives for both investors and small producers, and oil is no exception. " https://www.investopedia.com/articles/07/oil-tax-break.asp
 

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30 years ago when I was racing on the quarter miles strip, there was a guy with a Dodge Dart with a modified 225 slant 6. On the side of his car it said 6 = 8. He was turning better times than a lot of small block (283, 289, 318) V8s that were racing. I think the straight 6 that will replace the hemi will be fine power wise. I wouldn't buy a first generation 6, there will be bugs to work out. I wouldn't have any issue buying a 3rd generation 6.
 

huntergreen

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SO what part of Capitalism working includes tax credits. I have solar on my roof and wothiut the 30% Federal Tax Credit and the $2500 I got from the state it would be a money loser even in the high electric rate northeast.
It’s not part of capitalism. Capitalism consists of free markets. Taxing and credits are social engineering.
 

cdn cj

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30 years ago when I was racing on the quarter miles strip, there was a guy with a Dodge Dart with a modified 225 slant 6. On the side of his car it said 6 = 8. He was turning better times than a lot of small block (283, 289, 318) V8s that were racing. I think the straight 6 that will replace the hemi will be fine power wise. I wouldn't buy a first generation 6, there will be bugs to work out. I wouldn't have any issue buying a 3rd generation 6.
6=8 is a marketing slogan of Clifford Performance who specialize in 6 cylinder engines.
Also anyone who thinks you can’t get a nice sound from a 6 banger needs to listen to the 4.2 in my CJ.
 

mikeru

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Inline engines last longer than a V configuration. The Cummins and Ford's 300cu inline six come to mind.
Please re-read my post you quoted. It was more of a general statement. I wasn't making any claims on which configuration lasts longer. What I said was that smaller displacement forced induction engines won't have the longevity of a larger naturally aspirated engine for doing the same work. The smaller engine will be working harder, and will likely wear out faster, regardless of configuration. This can be mitigated by designing the FI engine with stronger parts, but this will increase costs. The bean counters who work for auto manufacturers generally force designers to save money in their designs, and will likely not allow them to put the best possible parts into their design.

In no way are either of your examples "smaller displacement forced induction engines".
 
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