![]() Since most vehicles are front wheel drive this makes the transmission more complex. Because the transmission sticks out the back the power flow has to turn 180 degrees to go to the front wheels. These engines are oriented in a traditional manner. This requires the manufacture of two complex items instead of just one.įinally the needed orientation of the engine provides extra problems. The cylinder block is split into two halves. Not all manufacturers want to work around that kind of width. If you have ever replaced spark plugs on a Subaru those engines are shoehorned in very tight. The engines have a larger widths when compared to an inline 4 or a V6. Flat-12's proved incompatible with ground-effects as the cylinder heads occupied the space where the venturi tunnels needed to be.īoxer engines are large and complex that is their greatest fault. (Compare this with the original all wheel drive Audi 80 Quatro that had a straight-5 hanging way-out ahead of the front axle.)Īt one point flat-12 engines were used in racing cars such as the Porsche 917, and many Ferrari F-1 cars (although these were technically 180° V-12s, which may have any cylinder bank angle). To accommodate front wheel drive-shafts the engine must be placed in front of the front axle line, and the short, low boxer engine has advantages. ![]() With regards to the modern Subaru layout, which originally featured 4-cylinder engines and all wheel drive, a longitudinal mounted boxer makes sense. Where boxer's really do seem to work is in air-cooled rear-engined cars (e.g., the VW Type-1 and Porsche 911) where width is less of a concern, the engine must be a short as possible to avoid a large mass behind the rear axle, and the banks of cylinders are easier to cool as they are more widely spaced from each other. ![]() Longitudinal mounted engines are preferred for front-engine, rear wheel drive, the boxer engine's lower mass probably does not provide enough advantage over the simpler straight-4 or V6. A straight-4 or a V6 are much more suitable that a flat-4 or flat-6 in this configuration. Many cars are now front wheel drive which work best with a compact, transversely mounted engine. The probable reason boxer or flat configurations are not used very often in modern cars is because a straight or V engines are almost always a better choice. True V's have pairs of rods sharing each crank throw. Like Vs boxers are more complex that straight engines, having 2 cylinder heads with associated head gaskets, exhaust manifolds etc., and double the number of camshafts, more complex camshaft chains or belts and more complex cooling.Ĭompared to Vs, boxer engines have a more complex crankshaft as they have a crank throw for each connecting rod. Compared to V engines boxers are not as tall, offering the ability to position mass lower in the vehicle's chassis, but are wider.Īll boxer engines feature low primary vibration as pairs of pistons are opposed and move in a way to cancel out each other's momentum. We look forward to your visit right here in Portland Oregon at Wentworth Subaru.Like V configuration piston engines, boxer or flat configuration engines can be made approximately half the length of a straight configuration engines. Test drive a Subaru today and experience the performance of a Boxer Engine. ![]() As the Subaru Boxer design is flat, the center of gravity for the vehicle is lowered, giving the vehicle better overall handling and efficiency. This allows for the Subaru Boxer engine to be more flat than a conventional design, giving the maximum transfer of power as the engine is positioned in-line with the drivetrain. Subaru Boxer Engine Efficiency and PowerGetting it's name from boxer like jabs, the pistons in the Subaru Boxer engine push out to either side as the cylinders lie flat on either side of the crankshaft. Other changes listed in the third generation Subaru boxer engine include changes to the intake ports, variable valve timing and implementation of exhaust gas recirculation for combustion chamber cooling. Some of the new innovations that give a 10% bump in fuel efficiency and performance include a longer crankshaft stroke, a narrower bore, and a more compact combustion chamber. Subaru Boxer Engine Design & SpecificationsIncluded in every Subaru Model Vehicle is a completely redesigned horizontal Subaru Boxer engine.
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