Bmw I6 Vs. V8 - BMW Forum - BimmerWerkz.com
5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)

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#1 (permalink) Old 11-26-2004, 05:09 PM
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Dballogh has this question which was posted under a different topic. I figured make it a stand alone topic since I feel it is going to be tough to agree on one answer. Here it is and give it your best shot:
Dballogh:Say, if you had a straight 6, like I do in my 530 01 or a V8 and drove both the exact same would you expect the engine life to be longer in a V8?
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Note: dballogh is a relatively new member and we did not have the chance to welcome him to our forum. So
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#2 (permalink) Old 11-26-2004, 05:41 PM
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Quote:
Originally Posted by billB,Nov 26 2004, 06:09 PM
Dballogh has this question which was posted under a different topic. I figured make it a stand alone topic since I feel it is going to be tough to agree on one answer. Here it is and give your best shot:
Say, if you had a straight 6, like I do in my 530 01 or a V8 and drove both the exact same would you expect the engine life to be longer in a V8?
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Note: dballogh is relatively new member and we did not have the chance to welcome him to our forum. So
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well i dont think a six should be put in those bigger cars, but i would have to go with the straight six anyway because the v8 is much more complicated leaving more room for things to go bad prematurely. straight six is simple, economic, and an amazing performer.

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#3 (permalink) Old 11-26-2004, 05:52 PM
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Quote:
Originally Posted by 3serbmdubya,Nov 26 2004, 11:41 PM
Quote:
Originally Posted by billB,Nov 26 2004, 06:09 PM
Dballogh has this question which was posted under a different topic. I figured make it a stand alone topic since I feel it is going to be tough to agree on one answer. Here it is and give your best shot:
Say, if you had a straight 6, like I do in my 530 01 or a V8 and drove both the exact same would you expect the engine life to be longer in a V8?
[snapback]237705[/snapback]
Note: dballogh is relatively new member and we did not have the chance to welcome him to our forum. So
[snapback]237974[/snapback]

well i dont think a six should be put in those bigger cars, but i would have to go with the straight six anyway because the v8 is much more complicated leaving more room for things to go bad prematurely. straight six is simple, economic, and an amazing performer.
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So does this imply that the inline 6 will outlast the V8? simpler 6er vs. complicated V8 engine thus premature failure on the 8?
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#4 (permalink) Old 11-26-2004, 06:46 PM
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One tends to think the 6er has more torque for the simple reason: bigger cyl. means more torque. Having accepted that then for higher revs, V8 will have more because of the small but MORE cyl. Did I say it right? Does this make sense?

Your input.....
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#5 (permalink) Old 11-26-2004, 08:13 PM
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The 6's last longer and the 8's are more powerful in every way (with the exception of the s54 and s38)

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#6 (permalink) Old 11-26-2004, 10:20 PM
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While the V8 is for sure more powerful, do we know if/why the 6er lasts longer?
A. Not too long ago someone told me on this forum 6er tends to work harder and thus is prone to early failure.
B. 3serbmdubya argued to the contrary in his thread above and predicted premature failures on the V8.

I wish we can clarify the above issues while assuming everything equal, tuneups etc. Dirty Tools might be holding the golden key!!
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#7 (permalink) Old 11-26-2004, 11:20 PM
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Quote:
Originally posted by billB@Nov 26 2004, 11:20 PM
While the V8 is for sure more powerful, do we know if/why the 6er lasts longer?
A. Not too long ago someone told me on this forum 6er tends to work harder and thus is prone to early failure.
B. 3serbmdubya argued to the contrary in his thread above and predicted premature failures on the V8.

I wish we can clarify the above issues while assuming everything equal, tuneups etc. Dirty Tools might be holding the golden key!!
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its kind of like volkswagen's w8, w12; or turbo/supercharging an engine. there is more stress on the internal parts. a straight six has all the pistons lined up with the driveshaft for simple operation so you get a lot of power that way without using much space/fuel instaed of aligning 8 in a v shape. sure the 8 banger displaces a lot more, and you might get a bit more hp, but iin the long run. i would definatley rather have the straigh 6...... or maybe a straight 8



wow long post ^

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#8 (permalink) Old 11-27-2004, 12:04 AM
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For sure a straight 8 will do the trick. Just imagine how many cylinders they needed to line up in one raw to achieve close to zero need for the harmonic. Thanks to the modern EFI engines.
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#9 (permalink) Old 11-27-2004, 12:26 AM
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Quote:
Originally posted by billB@Nov 27 2004, 01:04 AM
For sure a straight 8 will do the trick. Just imagine how many cylinders they needed to line up in one raw to achieve close to zero need for the harmonic. Thanks to the modern EFI engines.
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i got this old drag racing video (modern marvels) and they accually had a straight 8 back then.... it was pretty interesting

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#10 (permalink) Old 11-27-2004, 12:32 AM
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Ive seen SEVERAL BMWs with an inline six (especially m30 engine) with 275,000 - 300,000 miles running EXCELLENT on the original engine. I can not say the same about the BMW v8s. They're may be a few, but not nearly as many.

Maybe that helps sum it up a bit better. Inline six = much more reliability.

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#11 (permalink) Old 11-27-2004, 01:11 AM
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I'm sure you guys are probably right about the BMW I6s, but when we used to have to choose between 4-cylinder and 6-cyl model of a car my dad always wanted the six cylinder, not only for the extra fun of driving with more power but he said it would last longer because the engine wouldn't have as much strain on it (wouldn't be working as hard). Not sure if that should be considered in BMW's case but I wanted to throw that out there.

And if it is true that the V8's don't last as long...when do you think I should get worried about my engine?

Anyone who ever buys used cars online, anyone even THINKING of starting a &quot;Is this deal too good to be true?&quot; thread, anyone who wants to be more educated about protecting themselves must <a href='http://www.carbuyingtips.com/fraud.htm' target='_blank'>read this</a>.

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#12 (permalink) Old 11-27-2004, 02:04 AM
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Typically people start to worry about their v8s around 175k+ miles. That is not to say that they cant last longer though. There are a bunch of 250k miles out there, just not as mnay as the I6s.

It is true that less strain helps save the life, but in BMWs case, their I6 is so well developed that it still outlasts the v8. The v8 is still an amazing engine, though.

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#13 (permalink) Old 11-27-2004, 07:14 AM
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If this was comparing the old 3.4 liter M30 I6 against the 3, 4 liter V8s of the early to mid 90s, the I6 would have been longer lasting for sure because the V8 had that cylinder bore wear problem. But, the 3.5 & 4.4 V8s since the e39 arrived are no problem reliability wise and are excellent engines.
Technically, piston area is greater for an engine with more cylinders for a given level of displacement. That gives more potential for extra horsepower, which is why racing car engines, like F1, are relatively low displacement (3 liters), but have many cylinders (V10). There were also 12 (Ferrari) and 16 (BRM) cylinder F1 engines in the past.
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#14 (permalink) Old 11-27-2004, 11:14 AM
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Well, now that we've established *THAT*:
Will the 2.5's out last the 3.0's?
2.5's have to "work harder" (you can even tell becuase the 2.5's fuel economy is (slightly) worse than the 3.0's fuel economy).

I think that the 3.0's will outlast, the 2.5's have to work harder.
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#15 (permalink) Old 11-27-2004, 11:31 AM
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True, certainly in the heavier 5 series the 2.5 engine has to work harder, burning more gas doing so. Probably the only time it will be cheaper than the 3 liter is initial purchase price. The 3.0 might even be easier on the automatic gearbox because it will allow a taller gear to be held and the box won't have to hunt between ratios so often.
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