What are the merits of I6 engines over V6
12-20-2006, 08:49 PM
#31
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Originally Posted by Wiu-Bimmer' post='369300' date='Dec 20 2006, 08:17 AM
With this said, then an I8 would be better than a V8 if it wouldn't be for the physical size of the engine issue, right?
Then you would probably end up using 1/4 of the engine as center console
Then you would probably end up using 1/4 of the engine as center console
1. The car would have a long hood becuase of the engine size.
2. The crankshaft would be too long, making it prone to damage.
12-21-2006, 11:39 AM
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Originally Posted by f?nf drei?ig' post='369254' date='Dec 20 2006, 12:10 AM
Toyota/ Lexus, and the V8 Volvo XC90 have engines built buy Yamaha. Unless you research it you don't know what is in there.
_ _ _ _ _
There has been even 8 in row engines and of course V16 engines manufactured.
Those of you who really like cars, do some google...
12-21-2006, 01:50 PM
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Originally Posted by Ricracing' post='370002' date='Dec 21 2006, 08:39 PM
At least you have no engineer school behind you Mr 5 30
_ _ _ _ _
There has been even 8 in row engines and of course V16 engines manufactured.
Those of you who really like cars, do some google...
_ _ _ _ _
There has been even 8 in row engines and of course V16 engines manufactured.
Those of you who really like cars, do some google...
12-25-2006, 12:47 PM
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In I-6 firing order follow sine curve and is that way in line with natural harmonic vibrations (internally balanced without separate balancing axle). So like sine curve in 3-phase AC current: new ignition in every 120 degrees.
In ship world one can still find almost any configuration from I-4 to I-14/16 and V2 to V18. In ship world big inline engines are build because of they are cheaper if compared to V form. V is used for space...
Land vehicles have V for space, I-4 for money and I-6 for comfort/sound/Power/image IMO.
SKaffa
PS there is also VR5, VR6 and VR10 from VAG
In ship world one can still find almost any configuration from I-4 to I-14/16 and V2 to V18. In ship world big inline engines are build because of they are cheaper if compared to V form. V is used for space...
Land vehicles have V for space, I-4 for money and I-6 for comfort/sound/Power/image IMO.
SKaffa
PS there is also VR5, VR6 and VR10 from VAG
12-25-2006, 12:54 PM
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Originally Posted by skaffa' post='371003' date='Dec 25 2006, 01:47 PM
In I-6 firing order follow sine curve and is that way in line with natural harmonic vibrations (internally balanced without separate balancing axle). So like sine curve in 3-phase AC current: new ignition in every 120 degrees.
In ship world one can still find almost any configuration from I-4 to I-14/16 and V2 to V18. In ship world big inline engines are build because of they are cheaper if compared to V form. V is used for space...
Land vehicles have V for space, I-4 for money and I-6 for comfort/sound/Power/image IMO.
SKaffa
PS there is also VR5, VR6 and VR10 from VAG
In ship world one can still find almost any configuration from I-4 to I-14/16 and V2 to V18. In ship world big inline engines are build because of they are cheaper if compared to V form. V is used for space...
Land vehicles have V for space, I-4 for money and I-6 for comfort/sound/Power/image IMO.
SKaffa
PS there is also VR5, VR6 and VR10 from VAG
12-25-2006, 04:38 PM
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Originally Posted by ImolaRedM' post='369272' date='Dec 19 2006, 03:06 PM
For the same reason they put HEMI on the side of trucks today. BMW was using domed combustion chambers (HEMI) since the 328 of the 1930's era. If you hype things up enough people will buy into it.
Bubbarosa, how many times did you change the exhaust manifold on the TJ? The last Wrangler (TJ) was in production for 10 years; from 1997 to 2006. That inline 6 was used in one form or another since the 1960's (AMC).
Bubbarosa, how many times did you change the exhaust manifold on the TJ?
The last Wrangler (TJ) was in production for 10 years; from 1997 to 2006. That inline 6 was used in one form or another since the 1960's (AMC).LOL, haven't......yet. The newer I6's are supposed to have "better" manifolds than previous versions (i still have my 2000 btw). My buddy had a '99 and didn't have problems with it either. Guess we're lucky? The YJ's also used the same inline-6 starting in 1990 i believe, but you're right, the 258s have been around a while, early CJs i'd imagine.
12-26-2006, 12:11 AM
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Originally Posted by swajames' post='371004' date='Dec 25 2006, 09:54 PM
From BMW's standpoint I do have to disagree a little on just one point - whilst they are outstanding in all other respects, BMW's I6's are down on power. Competiting V configurations are churning out greater power than BMW's inline sixes, in some cases with no real discernible difference in NVH.
12-26-2006, 06:56 AM
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Originally Posted by colejl' post='371077' date='Dec 26 2006, 01:11 AM
Can't think of any naturally aspirated 3l's beating the latest I6 (272bhp)? VW/Audi 3.2 = 250bhp, Merc 3.5 = 270bhp, Ford 3.0 = 220bhp, Jaguar 3.0 = 240bhp, Citroen 3.0 = 215bhp, Lexus 3.0 = 245bhp, Porsche 3.4 = 295bhp. Not sure about the American market?
12-26-2006, 10:37 AM
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Originally Posted by swajames' post='371137' date='Dec 26 2006, 03:56 PM
Infiniti and Acura (Nissan and Honda) do have competing V6's with close to 300 bhp (more in one VQ variant), they are both naturally aspirated and whilst admitedly are slight larger displacement than the N52 that's part of the I6/V6 equation as a larger displacement engine can fit in the same engine bay. My point is just that (272 bhp 535d aside) BMW is fielding 255 bhp (and until relatively recently was fielding 225 bhp) when their direct competitors are fielding more in their E60 peer models, and both examples I gave are very strong engines. It's actually possible to buy a Camry over here with more horsepower than the latest N52 equipped 530i. That's what makes the 3L turbo gasoline engine so important, and hopefully by 2008 we'll have the twin turbo diesels over here too. BMW's gasoline I6's are great engines but some competing V6's are at least as good (it's a different story in the diesel engines - I don't see any competitor coming close to the 530d and 535d). Come to think of it, my V8 is also down on power compared to its MB peer now too - 382 to the Merc v 360 in my 550...
[codebox]
Car Engine BHP BHP/l
Acura 3.7 300 81.1
Infiniti 3.5 280 80.0
BMW 3.0 258 86.0
Mercedes 5.5 388 70.5
BMW 4.8 363 75.6[/codebox]
(I'm using 735 W hp, not 745)
So BMW's specific power is the highest in both cases. Which does not take away much once you are on the road (20-40 kg in weight, at most), but asking more of the engine is not very fair! You need a bigger one!
12-26-2006, 11:00 AM
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Originally Posted by dlevi67' post='371201' date='Dec 26 2006, 07:37 PM
Mmm... capacity may count for a lot, actually. Just picking the ones you mention:
[codebox]
Car Engine BHP BHP/l
Acura 3.7 300 81.1
Infiniti 3.5 280 80.0
BMW 3.0 258 86.0
Mercedes 5.5 388 70.5
BMW 4.8 363 75.6[/codebox]
(I'm using 735 W hp, not 745)
So BMW's specific power is the highest in both cases. Which does not take away much once you are on the road (20-40 kg in weight, at most), but asking more of the engine is not very fair! You need a bigger one!
[codebox]
Car Engine BHP BHP/l
Acura 3.7 300 81.1
Infiniti 3.5 280 80.0
BMW 3.0 258 86.0
Mercedes 5.5 388 70.5
BMW 4.8 363 75.6[/codebox]
(I'm using 735 W hp, not 745)
So BMW's specific power is the highest in both cases. Which does not take away much once you are on the road (20-40 kg in weight, at most), but asking more of the engine is not very fair! You need a bigger one!
When the 530i gets updated to 270bhp-ish is mighty impressive considering the Infiniti needs 500cc more and the Acura 700cc. 
I'd also like the see the comparative emissions and consumption figures?