[Bluesummer]

I think BMW would've made a more formal news if there were really a cross country traveler 300k+ mile 335 especially since the recent recall on the N54 engine. At least that's what I would do if I work for BMW's marketing.

[ZTUNER]

Originally Posted by TrackRat

The rings, piston ring lands, valve guides, etc. wear out and the cylinder wear is also higher at TDC and on the piston thrust surfaces in Turbo gas engines. By the time you hit 150K miles these engines are using a lot of oil as a result. It's not like they just blow up, they simple wear faster than NA engines because of the higher cylinder pressures and heat encountered in a turbo or supercharged gas engine.

Not true, based on what you say high comp diesels should not last very long but infact they last much longer than comparable has engines. Just a fyi diesels routinely run 22:1 static compression and high boost pressures. I am talking about diesels in cars not trucks. Yes the peak rpm is lower by 1000 1500 rpm but thats mostly due to torque ratings and the fact that the power delivery is better at lower rpms in diesels not so much due to longevity. In a di engine, what moving part does the fuel lubricate ?

Harry

[mycoupe]

Originally Posted by ZTUNER

Not true, based on what you say high comp diesels should not last very long but infact they last much longer than comparable has engines. Just a fyi diesels routinely run 22:1 static compression and high boost pressures. I am talking about diesels in cars not trucks. Yes the peak rpm is lower by 1000 1500 rpm but thats mostly due to torque ratings and the fact that the power delivery is better at lower rpms in diesels not so much due to longevity. In a di engine, what moving part does the fuel lubricate ? Harry

The fuel isn't lubricating, it's washing the cylinder walls clean of oil which will cause them to score and wear faster than a non-DI engine. The fuel is then scraped into the crankcase by the piston rings causing fuel dilution, causing the lack of lubrication to be passed on to the entire engine lubricated system.

[bimmertt]

Originally Posted by Bluesummer

I think BMW would've made a more formal news if there were really a cross country traveler 300k mile 335 especially since the recent recall on the N54 engine. At least that's what I would do if I work for BMW's marketing.

+1....absolute BS. I would've laughed in his face. 300k miles is hard to believe in of itself, then add that it is a BMW and then add that it's only 4 years old.

[RedDinan335i]

Originally Posted by therealm3

FWIW I have a 10/06 build and I have an Oil cooler. (6MT)

12/06 build E92 and have a oil cooler.

[shifterboy45]

Originally Posted by mycoupe

The fuel isn't lubricating, it's washing the cylinder walls clean of oil which will cause them to score and wear faster than a non-DI engine. The fuel is then scraped into the crankcase by the piston rings causing fuel dilution, causing the lack of lubrication to be passed on to the entire engine lubricated system.

quickly ..

the principle of "fuel wash" carries back to normal carb/non fuel injected systems...

fuel wash is created by
#1 insufficient fuel/air vaporization --- the inability to completely vaporize (and mix) the air /fuel mixture.
#2 poor volumeteric efficiency -- the inability to completely burn the air and fuel charge during the power stroke.

DI engines are better at VE % thus the residual components in the CC will have LESS fuel to dilute the contents of the crankcase.

air/fuel mixture happens in the CC taking advantage of the accumulated heat (to fully vaporize the fuel particles) -- again leaving less hydrocarbon residuals in the cylinder during the exhaust stroke.

normally a port injected engine will not fully vaporize the mix due to air speed, intake runner length, ambient air temp and so on .. but its better than dumping a bunch of fuel down a set of monster venturis on a carb.

btw: fuel was a lubricant at one time --
till we decided that leaded gasoline was a no-no -- lead lubricated the face of the valves and the valve seats

[MDORPHN]

Originally Posted by shifterboy45

quickly ..

the principle of "fuel wash" carries back to normal carb/non fuel injected systems...

fuel wash is created by
#1 insufficient fuel/air vaporization --- the inability to completely vaporize (and mix) the air /fuel mixture.
#2 poor volumeteric efficiency -- the inability to completely burn the air and fuel charge during the power stroke.

DI engines are better at VE % thus the residual components in the CC will have LESS fuel to dilute the contents of the crankcase.

air/fuel mixture happens in the CC taking advantage of the accumulated heat (to fully vaporize the fuel particles) -- again leaving less hydrocarbon residuals in the cylinder during the exhaust stroke.

normally a port injected engine will not fully vaporize the mix due to air speed, intake runner length, ambient air temp and so on .. but its better than dumping a bunch of fuel down a set of monster venturis on a carb.

btw: fuel was a lubricant at one time --
till we decided that leaded gasoline was a no-no -- lead lubricated the face of the valves and the valve seats

Great post. And is this the primary reason why DI engines can run leaner?

Neil

[shifterboy45]

Originally Posted by MDORPHN

Great post. And is this the primary reason why DI engines can run leaner?

Neil

Yes,

there is no longer a reason to overwhelm the combustion chamber with fuel to get enough of it to burn -- leaner operation and better gas mileage --

this car is good at both with making decent power -- years ago there would have been a trade-off, either power or mileage -- beautiful isnt it ??

[Noxious_]

Originally Posted by beemw

Well I already knew about this stuff, my sa confirmed that the ethanol kills our pump(fkn cheap gas companies putting ethanol in the gas!!!)
Then he started telling me that a bt cable annot clear all codes and that they can see overboost codes even if u delete them... Lol for some reason I beleive him but Im stock so I have nothing to worry about

BS!

[Ilma]

Originally Posted by shifterboy45

quickly ..

the principle of "fuel wash" carries back to normal carb/non fuel injected systems...

fuel wash is created by
#1 insufficient fuel/air vaporization --- the inability to completely vaporize (and mix) the air /fuel mixture.
#2 poor volumeteric efficiency -- the inability to completely burn the air and fuel charge during the power stroke.

DI engines are better at VE % thus the residual components in the CC will have LESS fuel to dilute the contents of the crankcase.

air/fuel mixture happens in the CC taking advantage of the accumulated heat (to fully vaporize the fuel particles) -- again leaving less hydrocarbon residuals in the cylinder during the exhaust stroke.

normally a port injected engine will not fully vaporize the mix due to air speed, intake runner length, ambient air temp and so on .. but its better than dumping a bunch of fuel down a set of monster venturis on a carb.

btw: fuel was a lubricant at one time --
till we decided that leaded gasoline was a no-no -- lead lubricated the face of the valves and the valve seats

I like your posts.....they are always so intelligent.

[acdHQK713K]

Originally Posted by raceyBMW

Old news, early AT's with sport pack didn't get oil cooler, only the manuals with sport pack did...those without sport pack do not get OC. They changed it so that both AT and MT with sport pack get the OC sometime in May-ish of '07.

XI's have to get the sport pack AND the 18" wheel option to get oil cooler.

Yep, I have the oil cooler and I am an 06/2007 sport with AT.

[BLK_08E90]

Originally Posted by san6279

I specifically asked my SA if an aftermarket OCC (specifically BSH) would void the warranty. He stated, while he didn't think it was necessary for a street-driven car, it would have no impact on either orig or CPO warranty. I've got that in writing.

I got a BSH OCC as well, you mind sharing that document in writing. Just in case and avoid the BS

[san6279]

Originally Posted by BLK_08E90

I got a BSH OCC as well, you mind sharing that document in writing. Just in case and avoid the BS

Just an email from my SA, but I'll fwd if you'd like. My impression is some dealers are more mod friendly than others. Not that it couldn't all blow up in my face if something went wrong.

[ZTUNER]

Originally Posted by mycoupe

The fuel isn't lubricating, it's washing the cylinder walls clean of oil which will cause them to score and wear faster than a non-DI engine. The fuel is then scraped into the crankcase by the piston rings causing fuel dilution, causing the lack of lubrication to be passed on to the entire engine lubricated system.

ummn you obviously didn't understand what i was saying but nm.

[Graystone]

07 sport 6mt I have OIL cooler. Euro delivery.