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      10-29-2012, 11:01 PM   #1
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Arrow BIMMERPOST Review: BMW 3 Cylinder Turbo

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BIMMERPOST Review: BMW 3 Cylinder Turbo
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Behind the wheel of the new "three"

By Manfred Jerzembek


BMW is putting huge effort in launching a revolutionary, new "three" [full technical details below]. Before you get too excited, let's be clear that what we are talking about is not the next generation of the quintesssential sports sedan. The "three" refers to the entry-level iteration of BMW's new, modular engine family. In the quest to modernize its engine portfolio and achieve maximum economies of scale, Munich is launching closely related three-, four- and six-cylinder engines for diesel and gasoline applications.

There is a lot of good news hidden here. For one thing, BMW won't need to co-operate with PSA Peugeot and Citroen anymore to fulfill its engine needs in the compact segment. Secondly, the vast economies of scale mean that BMW can optimize its cost structure in order to better compete with Audi and Mercedes-Benz. And perhaps most importantly, the top engines remain in-line sixes.

Here are some of the quotes from BMW's three cylinder press event:

"We believe that the internal combustion engine will remain the dominant means of propulsion. Therefore, we are relentlessly making it better." (R&D chief Herbert Diess)

"The three-cylinder engine has the same technology and the same genes as our legendary Twin-Power turbocharged straight-six." (R&D chief Herbert Diess)

"We are especially proud of its sporty sound. It has a distinct character and gives the driver a dynamic feedback while accelerating." (R&D chief Herbert Diess)

"A three-cylinder is mechanically not much different from a six." (BMW's head of drivetrain testing Bernardo Lopez)

"The position and angle of the engine are identical between gasoline and diesel models. And there is a high flexibility in production. We can do a three-cylinder gasoline and a three-cylinder diesel engine on one line, and the same is true of four- and six-cylinder engines." (BMW's head of drivetrain testing Bernardo Lopez)

Speaking with the engineers present at the event, we were told that the first BMW with a three-cylinder engine will be the i8, where it will make around 225hp and be complemented with electric motors. The three-banger will also go into the next-generation Mini and into front-wheel drive 1 series BMW models, such as the compact people mover previewed by this year's Paris auto show concept. It is not yet decided whether this engine will also go into the rear-wheel drive 1 series and the 3 series; theretically, it is easily doable.

Time to get behind the wheel of the red 1 Series hatchback which BMW has fitted with a 175hp, turbocharged 1.5-liter three and an eight-speed torque-converter automatic. It is not as vibration-free as promised, particularly below 3000rpm. The redline is currently at 6500rpm, but more is possible down the road. The higher you rev, the better and smoother it feels. Revs are built up quickly, the heavy 1 series is surprisingly agile. A manual transmission version is under development. BMW says that nothing has been done yet in terms of sound engineering, so there is hope for a sportier perception. All in all, however, this engine feels more like a Volkswagen Up than like a straight-six...

BMW admits there is still room for improvement not only in terms of sound, but also consumption and emissions. What is the three-cylinder good for? Potential fuel savings of 5 to 15 per cent, and about 20 lbs less weight for the engine. And don't forget - this interests BMW - that it'll be cheaper to produce than a four.

Given the fact that BMW defines itself by engine technology, we were not surprised to be told by a confidant that the decision to present this prototype was controversial. But "we had to do it at some point," he tells us. We have mixed feelings about the new "three". Perhaps it's a good idea to keep it out of the 3.




Full technical details on 3 Cylinder Turbo































































































Press Release Details:

The New BMW Group Efficient Dynamics engine family - technologies powering the future, new engine family with 1.5 litre BMW TwinPower Turbo engine.

Since the spring of 2007, the BMW Group has had the most comprehensive concept for the consistent reduction of fuel consumption and emissions at its disposal - the Efficient Dynamics development strategy. Efficient Dynamics is an integral part of all areas of vehicle development and is a guiding principle. This includes fuel-efficient petrol and diesel engines, transmissions delivering a particularly high level of efficiency, ancillary equipment controlled on an “as needed” basis, intelligent lightweight engineering and sophisticated aerodynamics, as well as the continuing development of the BMW ActiveHybrid technology and innovative concepts for electromobility.

As a technology of the future, the BMW Group is relentlessly driving forward the electrification of its vehicles, and yet still sees great potential for conventional engines. Therefore, in the medium term, the internal combustion engine will remain the BMW Group’s underlying technology and will thus power both existing and future series of volume production vehicles as the standard drive unit. Today, the BMW Group already has at its disposal a high-tech concept in the form of TwinPower Turbo technology. Building upon this, the BMW Group developed a completely new family of engines, to even more effectively take advantage of this approach and to create an unprecedented degree of commonality. The market launch of further advanced drive units will take place the coming year. The first member of this new generation of internal combustion engines will be an advanced three-cylinder unit.



BMW TwinPower Turbo technology.

BMW TwinPower Turbo technology, which today is already fitted to many petrol and diesel engines and which in the course of time will be available for all new engines, occupies a key position in the on-going endeavour to reduce both consumption and emissions. The term “TwinPower” designates the compelling combination of variable load control on the one hand and the latest fuel injection technology on the other. The intelligent, regulating technology modules include the (double) Vanos infinitely variable camshaft control system, the VALVETRONIC variable valve timing system and the variable turbine geometry of the diesel turbochargers. These are complemented by the High Precision Injection direct fuel injection system for petrol engines and the Common Rail direct injection system for diesel units. The third element of this high technology concept consists of turbo-charging. This allows a BMW TwinPower Turbo engine to be charged with a single turbocharger, dual turbochargers, a twin scroll turbocharger or with a triple turbo unit. An essential feature of these engines however, is the VALVETRONIC throttle-free load control system, which sets BMW TwinPower Turbo technology conspicuously ahead of its competitors. Unlike a conventional load control system using a throttle valve, VALVETRONIC responds to the driver’s power requirement by varying the valve lift, which results in systemic efficiency gains.

VALVETRONIC: fully variable valve lift on the intake side.

VALVETRONIC, the variable valve control system, is an innovative technology for the throttle-free load control of petrol engines, which the BMW Group has deployed to great advantage since 2001. This system, available exclusively from BMW, has been continuously improved and represents the perfect solution for the engine modules of the future. The latest generation of the VALVETRONIC system employs a high-precision mechanism with an eccentric shaft to vary the valve lift on the intake side. Since the change in valve lift is infinitely variable, the usual throttle valve can be dispensed with during normal operation of the engine. The result: because the regulation of the required air mass takes place within the engine itself, the throttle losses in the charge cycle and thus the consumption can be reduced to a minimum. The engine is now more responsive, since in contrast to engines with conventional load control, throttle-free operation ensures that ambient pressure is nearly always present at the intake valves and thus the time necessary for filling the intake manifold with fresh air is eliminated when the driver needs more power quickly.



A proven concept with a great future: don’t switch it off - dim it.

In stark contrast to other approaches, the VALVETRONIC system delivers gains in efficiency, including improved engine response and better engine torque development over the entire rpm range of the engine. The throttle-free load control system works like a dimmer, affecting all cylinders equally; the engine continues to run smoothly and its acoustic properties remain unchanged, something which cannot be said of cylinder deactivation. “Dimming instead of switching off” results in minimum fuel consumption and emission levels, while maximum dynamics, matchless comfort and sophisticated power delivery are achieved. In addition, this proprietary BMW technology can be used in engines of different sizes and power. In a nutshell, these new engine modules put the BMW Group in a position to configure engines of an optimal size, providing an ideal solution for each individual application.

The new family of engines with the 1.5 litre BMW TwinPower Turbo power unit.

Since BMW TwinPower Turbo technology can be integrated into engines of all capacities and any number of cylinders, it is the ideal system for the future Efficient Dynamics family of engines. One of the first members is a 1.5 litre BMW TwinPower Turbo engine. This compact in-line engine possesses all of the renowned characteristics which unite all BMW power units and is distinguished by a high degree of dynamism and efficiency. The characteristics typical of a three-cylinder engine are also much in evidence - high-revving characteristics, spontaneous responsiveness and a dynamic, sporty sound.

Excellent consumption figures thanks to lightweight, compact, low-friction design.

The 1.5 litre BMW TwinPower Turbo engine enjoys significantly reduced fuel consumption by virtue of its low internal friction. Due to the long ignition intervals, the charge cycle can be particularly well adapted to suit the needs of the driver, providing a high “low end torque”, as well as a rapid response. To this end, the new three-cylinder uses the latest generation of the High Precision Injection direct fuel injection system and the VALVETRONIC variable valve control system.

The “half of a six cylinder” runs remarkably smoothly.

The vibration characteristics are every bit as impressive as the unit’s lightweight and compact dimensions. In this respect, the three-cylinder engine shares a number of common features with the six-cylinder in-line engines - neither of them generates free inertial forces nor free moments of inertia. The three-cylinder engine is also free of first and second order inertial forces and the roll torque, which is very small compared to the six-cylinder engine, is completely eliminated by the use of a balance shaft. Thanks to its torsional vibration damper, which works on the principle of a centrifugal pendulum, the engine behaves immaculately even at low rpm, providing an extremely comfortable ride.



The three-cylinder sound - emotional and dynamic.

In addition to the high-revving characteristics and gratifying responsiveness, the emotional sound of the engine also makes an important contribution to the driving experience. Because the frequency of the sound of a three-cylinder engine increases 50 percent faster than that of a four-cylinder, the engine is perceived as being extremely vivacious and sporty.
The new family of engines in detail.

The forward-looking engine strategy of the BMW Group is the driving force behind lowering fuel consumption and CO2 emissions. Today, BMW TwinPower Turbo technology is used in petrol and diesel engines of various powers and capacities. With the introduction of the new Efficient Dynamics family of engines, this technology becomes the common characteristic of both types of engine, with three, four and six cylinders. Through the targeted development of additional components that can be used both for petrol and for diesel units, the BMW Group is steadily increasing the number of identical components within the family even further. In this way technical solutions in both current and future versions can be used on all of the engines, regardless of the number of cylinders, combustion method and power.

The BMW engine module system maximises synergies.

The basis of the new family of engines is a common design principle for in-line units. The basic engine is made up of optimized cylinder modules with capacities of 500 cc each, developed to the pinnacle of thermodynamic efficiency for use in a passenger vehicle. Consequently the new three-cylinder engine has a capacity of 1.5 litres, the four-cylinder unit is 2.0 litres and the six-cylinder is 3.0 litres. The power developed in each cylinder is between 30 and 55 kW (at 60 - 80 Nm) in the case of the petrol engine, while the diesel develops between 20 and 45 kW (at 75 - 110 Nm).
High degree of commonality between petrol and diesel engines.

The structural similarities between the petrol and diesel engines include the distance between cylinders, the aluminium crankcase, the balance shaft design, the arrangement of the timing chain, the layout of the cylinder head bolts and the high-quality coating on the cylinder bore surfaces. Overall, the number of identical parts used in engines powered by the same type of fuel climbs to 60 percent, while the level of structural similarities between petrol and diesel engines is around 40%. Even more benefits are provided by standardised interfaces. In addition to the identical engine mounting points, these are primarily the interfaces to the cooling circuit, the intake and exhaust manifolds and the heating and air conditioning systems. Compared to current models, the number of possible combinations in these areas has decreased by about half. Finally, all of the power units have the same “cold” intake and “hot” exhaust sides. This is why the three and four-cylinder engines in this new family are eminently suited to both longitudinal and transverse mounting in future BMW and MINI models.



Decisive development, flexible manufacturing, premium quality.

With the new modular engine, the BMW Group will in future be able to build three, four and six-cylinder power units delivering different levels of performance, each perfectly matched to its respective vehicle. This results in larger volumes, leading to significant savings in both development and production. In addition, the high degree of commonality facilitates the development of additional engine versions, which can then be realised economically at short notice, even in relatively small numbers. For the first time, petrol and diesel engines belonging to this new range can be manufactured together, at the same time, in the BMW Group’s engine production facilities. In this way, even short-term fluctuations in demand or new market developments can be addressed flexibly, with great success.

The future is here.

The architecture for the new series of models and new engines has already been defined. With the BMW Group’s new Efficient Dynamics family of engines, it is also possible to provide for a wealth of new models of automobile in the coming years. Because theoretically, the new family of engines could provide ten ultramodern petrol and diesel engines with three, four or six cylinders, for vehicles with both longitudinal and transverse engine positions.



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      11-01-2012, 11:08 AM   #2
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Impressive stuff.
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      11-01-2012, 11:22 AM   #3
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I'm really interested in this engine. If this thing is really that smooth like an I6 and produces fairly amount of power. I can imagine this engine in a Z4 and make it a good FMR. And of course, i8.
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      11-01-2012, 11:29 AM   #4
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Thanks for sharing. Very interesting.
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      11-01-2012, 11:30 AM   #5
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Nice review...certainly better than the 3 cylinder geo metro delivery car I used to drive for Napa Auto Parts back in high school.
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      11-01-2012, 11:33 AM   #6
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I wonder about the engine braking capabilities of the 3-cylinder engine. It is really weak on our F20 116i, and the new engine is supposed to have even lower friction. Even more energy will be wasted by heat in the brakes. I can't even feel the contribution from the electric energy regeneration.

I would also have liked to have units on the time axis of the step response graph, and an old fashioned N/A-engine like the M42B18 for reference. The throttle response has become very sluggish over the years, compared to what it used to be like.

(An electric hybrid motor in the drive line could perhaps deal with both issues)

Other than that, the concept looks good.
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      11-01-2012, 11:34 AM   #7
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sounds pretty awesome for a fun/efficient daily
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      11-01-2012, 11:36 AM   #8
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"A three-cylinder is mechanically not much different from a six." (BMW's head of drivetrain testing Bernardo Lopez)

Thing is: 6 cyliner engine is naturally balanced, while this half thing needs shafts to get rid of vibration. Im still thinking 3 cyls is a way to reduce production costs, and knowing bmw, we will benifit nothing from it. Im not going to buy anything with this kind of thing under the hud. 3 cyls are for bikes, sorry.
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      11-01-2012, 11:51 AM   #9
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Quote:
Originally Posted by KSERGEI-BY View Post
"A three-cylinder is mechanically not much different from a six." (BMW's head of drivetrain testing Bernardo Lopez)

Thing is: 6 cyliner engine is naturally balanced, while this half thing needs shafts to get rid of vibration. Im still thinking 3 cyls is a way to reduce production costs, and knowing bmw, we will benifit nothing from it. Im not going to buy anything with this kind of thing under the hud. 3 cyls are for bikes, sorry.
I think it makes sense with 3 cylinder engines in cars. BMW used to make 2 L six cylinder engine. They were smooth, but not very effective. A 2 L four is better in most ways. By the same reasoning, it is natural to make a 1.5 L engine with only three cylinders.

With turbo chargers, a 1.5 L engine now has enough power and torque for compact cars. The big cars will still have bigger engines with more cylinders.
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      11-01-2012, 11:57 AM   #10
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I wonder why the 6-cylinder gas and diesel engines are the only ones in the chart without the arrows indicating assembly line flexibility.
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      11-01-2012, 11:59 AM   #11
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This new engine family sounds awesome. Efficient and powerful. BMW is THE best engine manufacturer.
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      11-01-2012, 12:04 PM   #12
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Quote:
Originally Posted by KSERGEI-BY View Post
Thing is: 6 cyliner engine is naturally balanced, while this half thing needs shafts to get rid of vibration. Im still thinking 3 cyls is a way to reduce production costs, and knowing bmw, we will benifit nothing from it. Im not going to buy anything with this kind of thing under the hud. 3 cyls are for bikes, sorry.
So you are saying that i8 is a bike??
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      11-01-2012, 12:08 PM   #13
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Quote:
Originally Posted by ovekvam View Post
I think it makes sense with 3 cylinder engines in cars. BMW used to make 2 L six cylinder engine. They were smooth, but not very effective. A 2 L four is better in most ways. By the same reasoning, it is natural to make a 1.5 L engine with only three cylinders.

With turbo chargers, a 1.5 L engine now has enough power and torque for compact cars. The big cars will still have bigger engines with more cylinders.
I would say it has a commercial sense for the manufacturer, but no more. It is known that downsized turbo engines, like say audi's 1.4t are good on paper, but still thirsty and short on torque in the real world. Im sorry, I still enjoy my 2 liter M52B20 inline 6

Thats how dowinsized stuff works in real world:
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      11-01-2012, 12:09 PM   #14
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If this helps BMW with CAFE, then I suppose this is a good thing. However, I won't be purchasing a car with a 3-cyl engine. Ever.

BMW may say this engine is great, but it's not exciting at all. Don't piss on my neck and tell me it's raining.
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      11-01-2012, 12:16 PM   #15
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Nice little half-engine
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      11-01-2012, 12:39 PM   #16
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If 175hp is the target for the production motor, then it makes absolutely no sense whatsoever to arbitrarily keep this engine out of the 3 Series. Nor, for that matter, does it make any sense to forgo it for any other vehicle series where this level of power is currently as good as or better than the norm at the low end. This would cover all *14i, *16i, and *18i vehicles, which means 1 series, 3 series, and X1.

Thus, I would be very surpised if BMW's intentions are anything other than to fully replace both the current N18B16 (Mini 1.6L) and N13B16 (BMW 1.6L) four cylinder engines with this new 1.5L I3. To not do so would completely undermine the gains made by the increased economies of scale.

Furthermore, especially if the 225hp version in the I3 is accordingly efficient, I would not be surprised to see this engine additionally take over the *20i role from the current N20B20. After all, the current *20i models are only at about 184hp. Even if BMW intends to raise that to around 200hp in the coming years the I3 would still suffice. And for that matter, today's *25i N20B20 offerings (just the F20/F21 125i for now, but possibly more soon) could theoretically transition to this engine as well.

Jason or southlight - any idea what the code is for this engine? N10 perhaps?
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      11-01-2012, 01:04 PM   #17
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Quote:
Originally Posted by mkoesel View Post
If 175hp is the target for the production motor, then it makes absolutely no sense whatsoever to arbitrarily keep this engine out of the 3 Series. Nor, for that matter, does it make any sense to forgo it for any other vehicle series where this level of power is currently as good as or better than the norm at the low end. This would cover all *14i, *16i, and *18i vehicles, which means 1 series, 3 series, and X1.

Thus, I would be very surpised if BMW's intentions are anything other than to fully replace both the current N18B16 (Mini 1.6L) and N13B16 (BMW 1.6L) four cylinder engines with this new 1.5L I3. To not do so would completely undermine the gains made by the increased economies of scale.

Furthermore, especially if the 225hp version in the I3 is accordingly efficient, I would not be surprised to see this engine additionally take over the *20i role from the current N20B20. After all, the current *20i models are only at about 184hp. Even if BMW intends to raise that to around 200hp in the coming years the I3 would still suffice. And for that matter, today's *25i N20B20 offerings (just the F20/F21 125i for now, but possibly more soon) could theoretically transition to this engine as well.

Jason or southlight - any idea what the code is for this engine? N10 perhaps?
The N37 3 cylinder will be used in the F56 MINI and the F20 114i, and the FWD BMW. Production is to start in Hams Hall UK not that far out. Peak power is to be around 220hp but that is reserved for only certain low volume products.

The reason they launch the 114i is for marketing purposes really, it is a four cylinder and will be replaced by a more powerful and efficient 3 cylinder- automatically kills detractors.

The N20 is under tuned right now, but there are changes to the six cylinder lineup as well coming with the launch of the replacement to the 3 series coupe (and F80 M3). Things are said to get interesting...

ZF is also working on that 9 speed for MINI/FWD BMW configurations, but there is a DCT being tested as well according to sources. Whatever makes the most cost sense and has better packaging will get the nod.
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      11-01-2012, 01:12 PM   #18
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Wow - It has an oil dip stick!!

Go figure~
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      11-01-2012, 01:33 PM   #19
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Looks interesting
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      11-01-2012, 01:35 PM   #20
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Quote:
Originally Posted by KSERGEI-BY View Post
I would say it has a commercial sense for the manufacturer, but no more. It is known that downsized turbo engines, like say audi's 1.4t are good on paper, but still thirsty and short on torque in the real world. Im sorry, I still enjoy my 2 liter M52B20 inline 6
I used to have an M52B25, and they are really nice sounding, smooth engines. But my F20 116i with a 4 cylinder turbo engine still has the M52B20 beaten on real life torque and fuel efficiency by a good margin.

You straight six is far better on throttle response, though. Very enjoyable.
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      11-01-2012, 01:37 PM   #21
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Quote:
Originally Posted by red-sauerkraut View Post
Wow - It has an oil dip stick!!

Go figure~
So does the N13 four cylinder engine in the F20/F21.
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      11-01-2012, 01:43 PM   #22
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Quote:
Originally Posted by ovekvam
So does the N13 four cylinder engine in the F20/F21
Nice. We may never see those motors in North America.
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