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Boxer Vs. Flat Engines: Why They're Not The Same And Here's What Sets Them Apart
The flat engine dates back to 1897 and was originally patented by Karl Benz
Porsche is one of only two car manufacturers to still produce and develop boxer engine
The other car company is Subaru, which even had six-cylinder boxer engines at one point
Most prominently, the EG33 engine, featured in the Subaru SVX sports-luxury coupe
Subaru has decided to stick to flat-four engines for downsizing pruposes
Meanwhile, Hans Mezger was responsible for many of Porsche's greatest boxer engines
The Porsche 997 GT3 RS 4.0 was the last Porsche to feature a Mezger-designed engine
Boxer engines differ from other flat engines due to the number of crankshaft journals
Boxer engines have individual crank pins for each piston while traditional flat engines have one for each pair of pistons
In a boxer engines, every pair of opposing pistons mirror each other's movements, resulting in smoother operation
Boxer engines transmit power more directly to the transmission, making for less powertrain loss
They are also easier on fuel compared to a conventional design, making them perfect for hybrid setups
However, they are also more expensive to service due to often being a tight fit in the engine bay
In a crash, a flat/ boxer engine's lower center of gravity makes it safer as it is more likely to go under the passenger cabin
Swipe up for more information on what separates a boxer engine from a flat engine

Here's Why The EG33 Subaru Mill Is Considered A Poor Man's Porsche Boxer Engine
Besides Porsche, Subaru is one of the few automakers to embrace boxer engines, and this is the EG33 flat-six mill
It was based on the EJ-series flat-4 engines and is popular as an inexpensive option for Porsche engine swaps
The EG33 engine features thick cylinder walls, and has a sound profile that's similar to Porsche's air-cooled flat-six
Unfortunately, the EG33 engine was mated to a slow and unreliable, 4-speed automatic
Luckily, manual conversions are available and easy to perform
The EG33 was only used in the 1991-1996 Subaru Alcyone SVX coupe
Italian connection: The Subaru SVX was designed by Giorgetto Giugiaro at Italdesign
The McLaren F1-esque side windows were more of a "form-over-function" design element
All Subaru SVXs feature a two-tone exterior from the factory
Despite the canopy-inspired roof, the sunroof does not feature a glass
Similar to a Porsche 993, the Subaru SVX featured a lightbar connecting the taillights
With a drag coefficient of 0.29, the wedge-shaped Subaru coupe could make the most of the flat-six's 220-250 hp, and reach a top speed of 154 mph
Subaru SVX was meant to be a grand tourer, and featured lots of Alcantara inside the cabin
There was almost a shooting brake model, dubbed the Amadeus, based on the SVX and using the same flat-six engine
Swipe up to learn more about Subaru's EG33 engine and the car it came in.