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[millySHID]

turbo? from the factory?

 

 

 

yeah, stock. but you think twin turbo, i'd be putting a higher boost to it but hey, its bmw. the 335i is the twin turbo.

[///BHRpowered]

hmm, interesting.

 

bmw is going downhill, styling, quality, engineering, and especially charactor. I really liked my old m3, but it was such a cookie cutter, every other light some 14 y/o asian kit "yo I have that same car in (insert rice video game title)"

[millySHID]

here...

 

 

a 3.0-litre inline-six with twin turbochargers is under the hood — the badge on the trunk actually understates the effect you get when you stomp on the gas.

[///BHRpowered]

meh, other then an m6...which is now way out of my price range I don't think I would buy another bmw, maybe a 95 dakar yellow m3, but thats it

[millySHID]

haha yeah i hear ya, i'd love to buy my dads cls63 off him, but im oh..maybe 130,000 short.

 

i'll stick with my milly, i took out a new mazda 6 (the v6-gt) the new maxima and i want to take out a g37 coupe soon. I like the acura rdx as well, so we'll see, no matter what i get next, the milly's staying with me

[///BHRpowered]

130....are you crazy, alittle over a year ago I looked into a brand new one and it came in around 88k...of course that was alittle over a year ago, damn economy

[millySHID]

lets not forget im in canada too, if you go to the benz canada site, the car is like 128,000 without anything

[enginph]

I 'd love to drive an M6.

 

Guys as far as I know in bmw domain, i=4dr, x=4wd. How come 335i coupe?

 

[SteveSter]

No, they have the 335i coupe and the 335i sedan. They just like putting i at the end of everything.

[millySHID]

what i dont understand is why they keep inline engines in everything, i think its weird, except the v12's obv, they kinda can't unless they want a 12 foot long front end.

[///BHRpowered]

i-6's work well, a few less parts, semi easier to work on, every I-6 engine I'v ever had...granted a Jeep 4.0 and bmw M has been great.

[Troutman]

Inline sixes are a BMW trademark with torque being the main benefit. And the "i" means fuel injection... a very important selling point in a $200k car...

[millySHID]

I am not personally a big fan of the inlines though. Mercedes used to have the straight 6's back in the day, i think convenience these days are the V.

[enginph]

I-6 is more balanced than V6. Means less vibration. However the center of gravity for the engine is well above that of V6, hence bad cornering in any bmw (of course they have tons of other improvements to compensate for that). Didnt know about the torque though, what is the physics of that?

 

[SteveSter]

BMW engine are extremely advanced believe it or not they use one of the most complicated high pressure oiling systems and believe it or not they do not even have cams anymore, they are using electronically controlled solenoids to push the valves up and down. Which is why adding software like Dinan to a bmw can give a hige increase in power. To lower the center of gravity they have actually tried using a dry-sump system which works but not for consumers.

[Troutman]

Didnt know about the torque though, what is the physics of that?

 

I'm not quite sure, it's just common knowledge here, maybe Ren can give an explanation.

 

For example, the Australian Ford Falcon has a straight six with 391 Nm @ 3250rpm, compared to 336 Nm @ 4700 for the V6 Camry equivalent (which has slightly more power, but slightly less displacement).

 

Also, I've never heard of a bus with a V6!

[ing-schu@online.no]

Ehm, the Valvetronic system does involve cams, the solenoids alters lift from just about zero on idle up to full lift on high rpm. It also features variable valve timing. But even though BMW claims better efficiency, they don't use the system in their high performance engines. Then we're talking one butterfly for each cylinder and conventional, albeit variable timing, valvegear. But admittedly the system does make the engines very fuel efficient for their size, often beating competitors with 10- 15%.

 

Recently BMW has refined their diesel engines to performance levels, refinement and low CO2 emissions way beyond all competition, we're talking horselenghts. BMW are the ones to beat when it comes to building engines, no questions about it. Damn shame about the Chris Bangle shells though.

 

I've never bought the theory about different engine layouts giving more or less power and torque. V6 verus I6 normally means: V6 is more revvy due to lighter crank, but has more internal friction due to double set of valvegear, unless we're talking pushrod engines. In theory engine layout has nothing to do with power delivered. What matters is friction, weight and balance of internals, bore and stroke, compression ratio and ability to breath. Which of course implies valve timing, probably the area where development has been greatest in recent years. During history inline sixes has often featured longer stroke than V counterparts; always did the trick when generous torque from low revs is the goal.

[///BHRpowered]

sadly I must agree with xedos.

 

except for the 6, which needs some tweaking, almost EVERYTHING 04/05 on is garbage

[enginph]

Didnt know about the torque though, what is the physics of that?

 

I'm not quite sure, it's just common knowledge here, maybe Ren can give an explanation.

 

For example, the Australian Ford Falcon has a straight six with 391 Nm @ 3250rpm, compared to 336 Nm @ 4700 for the V6 Camry equivalent (which has slightly more power, but slightly less displacement).

 

Also, I've never heard of a bus with a V6!

 

How much does one cylinder moves the crank in I6? In V6 one cylinder pushes the crank 120degress. So when all cylinders fire, crank turns two revolutions. If I6 turns less, that explains more torque.

 

[ing-schu@online.no]

Most engines have a layout with equal bang distance during rotation. There are some exceptions though, above all in motorcycle engines. Harley Davidson is probably the most famous with its aquard limping idle, which is loved by the congregation. But Laverda used to build a 3pot with a 180 degree crank, kind of cool layout, leaving a weird exhaust note. Later they modified it to a regular 120 degree crank which gives way better balance. For those not knowing, a 180 degree layout in a 3pot means that two pistons go up and down together, while the third is opposite. This means the two pistons fire on each their revolution like in a 360 degree parallell twin, while the third is somewhere in between. In the car world, there are also some exceptions. The VR6 Vastevagen is limping, as well as some other non 60 degree V6 engines. But usually they are fit with offset crankpin cranks to compensate. And often a balancer shaft to disguise the downside of the layout, read bad vibrations. The main advantage of specially 90 degree V6 engines is as we all know possibility to machine in V8 production lines, read cheap production.

 

At the end of the line, the flywheel is put there to smoothen out the torque curve, which means the power pulses are flattened down to a more or less flat curve, putting less strain to the transmission and improving comfort and driveability.