V8 versus I6 discussion on TDS

[NPloysa]

This is good. BigDaddyT tries to set them "straight" but they keep insisting engine engineers design an I6 or V8 due to packaging only. What do you guys think?



Nick



EDIT: DUH!! A link WOULD be helpful!



http://forums.thedieselstop.com/ubb...24378&page=0&view=collapsed&sb=5&o=31&fpart=1

 

[JRD]

I think a link to the thread would be nice.

 

[mgoncalves]

I think the designers design around whatever engine they are told they are getting by the accounting department.





Matt

 

[bmoeller]

the designers design around whatever engine they are told they are getting

Do they ever. The engines get crammed in tighter and tighter.

 

[fox]

The only benefit for a v design is space limits.

I like KISS. keep it simple.

Or KISS SIR. keep it simple six in a row. !!!!



A v design has more wear points, parts lube drain issues. And more.

Let the other truck owners cry about it.

 

[nickleinonen]

The only benefit for a v design is space limits.

yep... same reason why on the loco engine i work on use fork/blade [emd] or master & articulating [ge] connecting rod setups... this lets the companion cylinders be exactally apart from each other without any offset

 

[tgee]

yep... same reason why on the loco engine i work on use fork/blade [emd] or master & articulating [ge] connecting rod setups... this lets the companion cylinders be exactally apart from each other without any offset

I-6 has 7 main bearings, V8 has 5, I-6 rod bearings are wider than V8, all adds up to stronger bottom end. I-6s typically have longer stroke, which usually means more torque. Isn't it true that an I-6 is easier to balance than a V8? Which means a little less rotating mass on the crank? nickleinonen, correct me if I'm wrong, but with a GE FDL, the left rod is connected to the right rod, and the right rod is connected to the crank. Don't the #2 cyls fire at the same time?

 

[67guzzler]

I think a link to the thread would be nice.

Doh!!! #ad

 

[Coolslice]

Try this... .



http://forums.thedieselstop.com/ubb...24378&page=0&view=collapsed&sb=5&o=31&fpart=1

 

[nickleinonen]

correct me if I'm wrong, but with a GE FDL, the left rod is connected to the right rod, and the right rod is connected to the crank. Don't the #2 cyls fire at the same time?

right side is the articulating rod, left side is the master rod, which is connected to crank. they do not fire at the same time. when left is on compression, right would be on exhaust. .



for those that do not quite understand master and articulating rods... a few picture links...



picture 1

picture 2

picture 3

picture 4

picture 5 - just slightly bend rod eh :-laf



i still haven't taken any pictures on how a fork & blade rod go together at work...

 

[klenger]

Interesting. Seems like the 2nd rod would get wrapped up, but it must work.

 

[Rocketdoc]

The only benefit for a v design is space limits.

Not true. A V8 engine is inherently balanced and has zero primary and secondary shaking forces... .

 

[Signal73]

http://inlinediesel.com/deathmatch :-laf

 

[biggy238]

Explain that. V8's come in too many degree seperations to make that statement.

 

[biggy238]

OMG i'm laughing so hard I can't type... . I was inot it until tellico LMAO

 

[BILLYGEE]

I'm confused

Sounds to me like somebody is cranking on the master rod too much... but engineer I ain't and all I know is over time I've always been of the school that in-line engines were always torgue champs and great for luggin and better fuel economy(six use less than eight)... Let's see, the piston connected to the connecting rod, the connecting rod connected to the crankshaft, the crankshaft connected to the flywheel, the flywheel connected to the drivetrain, now here the word of the Lord! Oh darn, that ain't the way that song goes...



No offense to any of the experts here in this discussion... I'm just a spectator.

 

[Joe G.]

Not true. A V8 engine is inherently balanced and has zero primary and secondary shaking forces... .

I wonder about that statement. I read a book some years ago about Dr. Ferdinand Porshe who I think knew a little about engines. According to him the best and most naturally balanced engine configuration was the boxer six (opposed instead of V). The next most naturally balanced engine was the inline six. V8 was way down the list.

 

[Alan Reagan]

Not true. A V8 engine is inherently balanced and has zero primary and secondary shaking forces... .

Not according to Ward's Ten Best Engines last year. The Cummins was a 325/600.



Check it out.



http://waw.wardsauto.com/ar/auto_decade_best_2/index.htm



From WardsAuto article:

"Of course, the inherently balanced I-6 architecture also presents a fundamental advantage over its V-8 competitors. "





A diesel mechanic told me years ago when I used to drive big trucks, that the inline six is the best balanced of any engine. The only thing that probably comes close is the Volve V-12.

 

[tgee]

right side is the articulating rod, left side is the master rod, which is connected to crank. they do not fire at the same time. when left is on compression, right would be on exhaust. .



for those that do not quite understand master and articulating rods... a few picture links...



picture 1

picture 2

picture 3

picture 4

picture 5 - just slightly bend rod eh :-laf



i still haven't taken any pictures on how a fork & blade rod go together at work...

Got my rights and lefts mixed up again. I asked about the lefts and rights firing at the same time because someone told me thats why GEs have that distinctive chugging sound. Guess he was wrong... . Thanks for the info!

 

[tgee]

I wonder about that statement. I read a book some years ago about Dr. Ferdinand Porshe who I think knew a little about engines. According to him the best and most naturally balanced engine configuration was the boxer six (opposed instead of V). The next most naturally balanced engine was the inline six. V8 was way down the list.

Just curious, why a DDC 6V92 doesn't use a crank vibration dampener, but an 8V92 does?