[F32Fleet]

I remember reading some time ago that the 2.5 liter will not meet California and other states upcoming stricter air quality requirements.

On a side note does the Europ 2.5 liter have a 3 stage intake similiar to the 3.0L in the US 330?

[E90Fleet]

Originally Posted by Socom

I remember reading some time ago that the 2.5 liter will not meet California and other states upcoming stricter air quality requirements.

On a side note does the Europ 2.5 liter have a 3 stage intake similiar to the 3.0L in the US 330?

Yes, the euro 325i has the 3 stage intake, and the euro/canada 323i is the 2.5L engine without the 3 stage intake

[F32Fleet]

Originally Posted by E90Fleet

Yes, the euro 325i has the 3 stage intake, and the euro/canada 323i is the 2.5L engine without the 3 stage intake

So I'm guessing that's prob why the 2.5L makes about same HP as the US 3.0l (325).

[E90Fleet]

Originally Posted by Socom

So I'm guessing that's prob why the 2.5L makes about same HP as the US 3.0l (325).

Yup

[Bimmerista]

Originally Posted by E90Fleet

Yes, the euro 325i has the 3 stage intake, and the euro/canada 323i is the 2.5L engine without the 3 stage intake

I thought that the Canadian 323 is the same 3.0 litre engine detuned and single staged (i.e the 325 with further detuning to reduce Hp to 170).

[cntlaw]

I believe the 3 litre 325i will generally have better fuel economy and smoother and quiet. Just guessing.

[jhbodle]

Originally Posted by cntlaw

I believe the 3 litre 325i will generally have better fuel economy and smoother and quiet. Just guessing.

I'll wager just the opposite. I don't know for sure, but here's why I think so:

Fuel Economy: Smaller displacement generally equals better fuel economy.

Smoother: BMW's smaller capacity sixes have always been smoother than their larger ones. The 6-cyl 2 litre in the old 320i was judged the smoothest of them all - something to do with the fact that the bore and stroke are optimum in the smaller engine.

Quiet: You could be right about that one but I don't know.

[JamieA]

Originally Posted by Socom

I remember reading some time ago that the 2.5 liter will not meet California and other states upcoming stricter air quality requirements.

I would be very surprised if this is true. If what you are saying is true, then the 330 is in trouble also, because the 2.5 is just a baby version of the 3.0 in the 330, they are exactly the same engine apart from the capacity.

The bits they strip off the 3.0 to make the NA 325 would make it less efficient than the Euro 2.5.

[Tierfreund]

Originally Posted by Bimmerista

I thought that the Canadian 323 is the same 3.0 litre engine detuned and single staged (i.e the 325 with further detuning to reduce Hp to 170).

Nope. The 323 actually is a completely different engine. While the 325 and 330 have the newest generation Inline 6 wiht the code N52 and Valvetronic, the 323 has the 2.5 Liter engine from the old E46. It the M54 engine without valvetronic and with an alloy engine block (the N52 has a magnesium/alloy composite block that is a lot lighter, but the weight advantage is offset by the heavier engine head from the valvetronic mechanism)

The M54 is a very good engine as well though, so the 323 is still a fione car. The main advantage of the N52 engine in the 325 and 330 is a higher redline, more power and a slightly better fuel economy relative to its output. Better efficiency.

Some say the M54 in the 323 sounds sweeter though.

[E90Fleet]

Originally Posted by Tierfreund

Nope. The 323 actually is a completely different engine. While the 325 and 330 have the newest generation Inline 6 wiht the code N52 and Valvetronic, the 323 has the 2.5 Liter engine from the old E46. It the M54 engine without valvetronic and with an alloy engine block (the N52 has a magnesium/alloy composite block that is a lot lighter, but the weight advantage is offset by the heavier engine head from the valvetronic mechanism)

The M54 is a very good engine as well though, so the 323 is still a fione car. The main advantage of the N52 engine in the 325 and 330 is a higher redline, more power and a slightly better fuel economy relative to its output. Better efficiency.

Some say the M54 in the 323 sounds sweeter though.

No, unless the canadian version is different

Here the 323i is a N52 from the 325i with the single stage intake

You can see here on realoem that the canadian version is also a N52 http://www.realoem.com/bmw/showparts...30&hg=11&fg=05

[Tierfreund]

Originally Posted by E90Fleet

No, unless the canadian version is different

Here the 323i is a N52 from the 325i with the single stage intake

You can see here on realoem that the canadian version is also a N52 http://www.realoem.com/bmw/showparts...30&hg=11&fg=05

You´re right. Im sorry, I was misinformed. Please disregard my previous post. (I´m not going to edit or delete it because that would make this thread more confusing to read)

[GTS_330]

I think the reason why the US 325 is faster 0-60 is because of the torque curve.... usually bigger engine displacement have better torque curve!!!! Correct me if i'm wrong!!!!

[E90Fleet]

Originally Posted by GTS_330

I think the reason why the US 325 is faster 0-60 is because of the torque curve.... usually bigger engine displacement have better torque curve!!!! Correct me if i'm wrong!!!!

Actually Europe quote 0-62mph ( 0-100Km/h) and the USA show 0-60mph

so the extra time is for the extra 2mph

[jhbodle]

You're probably right, fleet. However the US 325 does seem to have a bit more low down torque below 2750rpm according to BMW's graphs. Dunno if it makes a difference though.

[JamieA]

Originally Posted by jhbodle

You're probably right, fleet. However the US 325 does seem to have a bit more low down torque below 2750rpm according to BMW's graphs. Dunno if it makes a difference though.

Have you seen a torque graph for the 2.5l engine? I went searching for one a few months ago and couldn't find it, can you post the URL please?

Thanks in advance.

[voltron1011]

The main reason for the one engine in the US is because of the every-increasing polution control imposed on motor vehicles. It makes more sense for BMW to only have one motor to pass these tests than to have a range of motors that would have to each pass.
Also, cost is a factor too. It is cheaper to have only one engine as far as manufacturing and parts go.

[E90Fleet]

Originally Posted by JamieA

Have you seen a torque graph for the 2.5l engine? I went searching for one a few months ago and couldn't find it, can you post the URL please?

Thanks in advance.

You must just ask

[shragon]

interesting info.

[jhbodle]

Here's the US 325i torque curve to compare the low end torque:

[voltron1011]

Wow, the US 325 model does have a boat load (relatively speaking) of torque right at 1000 rpm... That explains the very linear power that it puts out.

[JamieA]

Originally Posted by E90Fleet

You must just ask

As Moby would say... Thank you thank you thank you thank you thank you thank you

[JamieA]

It is very interesting comparing the 3.0 from the US325 with the 2.5l engine used in the Euro 325.

Remarkably similar outputs and characteristics at near idential RPM. If you convert the US graph to Newton Meters, the torque is a bit higher at 1000 RPM, both raising to 2,700 RPM where they are near identical.

So on paper, the 3,0 seems to have more low down go...

So thanks Fleet, you have put to bed a major curiosity of mine...