[akatsuki...]

Hi guys,

I've searched, but I can't seem to find the answer. If I missed the thread, I apologize in advance, and hope someone can direct me.

Is the 328xi engine Direct injection? or is that only 335?

I am interested in the 328, but coming from a DI Turbo car, I am not a fan of the direct injection due to the carbon build up.

Thanks.

[crazed792]

It is HPI, yes. Not turbo though of course.

[VTECaddict]

Not DI, otherwise 328i's would have HPFP failures too.

[SteveMD]

Not DI.

[akatsuki...]

Originally Posted by crazed792

It is HPI, yes. Not turbo though of course.

Just googled HPI

In the BMW HPI system, the injection valve is configured as a piezo-injector and positioned in the middle between the valves and the spark plug at the center of the combustion chamber. Injection is at 200 bar—an increase over current systems.

So that's pretty much port injection, correct me If I'm wrong? Where oil will pass through the valves and intake manifold so that no carbon build up will start up?

I have a catch can on my current vehicle, but there is still some build up due to the PCV recirculating.

[crazed792]

Originally Posted by akatsuki...

Just googled HPI

In the BMW HPI system, the injection valve is configured as a piezo-injector and positioned in the middle between the valves and the spark plug at the center of the combustion chamber. Injection is at 200 bar—an increase over current systems.

So that's pretty much port injection, correct me If I'm wrong? Where oil will pass through the valves and intake manifold so that no carbon build up will start up?

I have a catch can on my current vehicle, but there is still some build up due to the PCV recirculating.

From what I've read on follow up I'm just confused now. I've read things that say the 328i engine does use the above technology and stuff that suggest it doesn't. I'm editing out parts of this reply that would probably confuse you as much as they confused me. I'm going to link you to two articles that firstly suggest HPI is direct injection and the second one is a Wikipedia article that suggests the N52 uses it.

Then there is a third article that states the N53 is an improvement over the N52 because it uses direct injection. Maybe I need to stop using wikipedia. Or learn to read better. Whichever applies:

http://www.greencarcongress.com/2005..._deploy_d.html
http://en.wikipedia.org/wiki/Gasoline_direct_injection

http://en.wikipedia.org/wiki/BMW_N53

[mike-y]

Originally Posted by akatsuki...

Just googled HPI

In the BMW HPI system, the injection valve is configured as a piezo-injector and positioned in the middle between the valves and the spark plug at the center of the combustion chamber. Injection is at 200 bar—an increase over current systems.

So that's pretty much port injection, correct me If I'm wrong? Where oil will pass through the valves and intake manifold so that no carbon build up will start up?

I have a catch can on my current vehicle, but there is still some build up due to the PCV recirculating.

No, not port injection. the above describes a direct injection system with the injector in the combustion chamber. Port injection locates the injectors in the intake manifold's runners, just before the intake ports that feed the valves. With port injection, the air is mixed with fuel before entering the combustion chamber.


Edit, and just for comparison, 200 bar is like 2900+psi (if I'm calculating it right - 1 bar = ~14.7psi), which is crazy!! a normal port fuel injection system runs between 40 and 80 psi. if this really is the case, it's no wonder the 335i has fuel pump problems!

[akatsuki...]

Originally Posted by crazed792

From what I've read on follow up I'm just confused now. I've read things that say the 328i engine does use the above technology and stuff that suggest it doesn't. I'm editing out parts of this reply that would probably confuse you as much as they confused me. I'm going to link you to two articles that firstly suggest HPI is direct injection and the second one is a Wikipedia article that suggests the N52 uses it.

Then there is a third article that states the N53 is an improvement over the N52 because it uses direct injection. Maybe I need to stop using wikipedia. Or learn to read better. Whichever applies:

http://www.greencarcongress.com/2005..._deploy_d.html
http://en.wikipedia.org/wiki/Gasoline_direct_injection

http://en.wikipedia.org/wiki/BMW_N53

Hey, you mentioned 328 is HPI.. where did you find that?

Originally Posted by mike-y

No, not port injection. the above describes a direct injection system with the injector in the combustion chamber. Port injection locates the injectors in the intake manifold's runners, just before the intake ports that feed the valves. With port injection, the air is mixed with fuel before entering the combustion chamber.


Edit, and just for comparison, 200 bar is like 2900+psi (if I'm calculating it right - 1 bar = ~14.7psi), which is crazy!! a normal port fuel injection system runs between 40 and 80 psi. if this really is the case, it's no wonder the 335i has fuel pump problems!

ok,

So it's safe to assume 328 engine isn't DI?
I read one of the faqs on this forum, it said 328 isnt, but 335 is.

Not a big fan of DI currently, hopefully companies deal with the carbon build up before I purchase my next DI vehicle..

[DimSum]

All N52 motors are not direct injection.

[crazed792]

Originally Posted by akatsuki...

Hey, you mentioned 328 is HPI.. where did you find that?

My second of the three links contains the following:

In 2003, BMW introduced a low-pressure gasoline direct injection N73 V12.[22] This initial BMW setup could not enter lean-burn mode, but the company introduced its second-generation High Precision Injection (HPI) system on the updated N52 straight-6 in 2006 which used high-pressure injectors.[23]


The N52 is the 328i engine. Anyway, that's where I got it. That said, I think it's a mistake in wikipedia and that N52 should read N54.

[akatsuki...]

thanks guys!

[deathsightx]

As stated before the N52, N51 and N52K all have regular port injection. The N54 has high pressure direct injection, the normal pressure in the system of the N54 is 50 bar, 200 is max injection pressure at the injector I believe.