Why the Nissan QR25 Engine is Still Being Used Over 20 Years Later

In this video we tear down a Nissan QR25DE engine to see what’s inside and how it works!
The Nissan QR25 engine is a 2.5L 4 cylinder engine. It is most commonly found in the Nissan Altima and Nissan Rogue, amongst other popular vehicles. It uses a timing chain driven variable valve timing camshaft on both the intake and exhaust sides. The intake uses tumble flow control flaps to promote mixing.
The engine layout is generally simple, using a plastic valve cover and aluminum alloy head, block and timing cover.
More importantly, the QR25DE engine has been around since the early 2000’s. Nissan has built upon it and improved it over the years increasing its power and efficiency while reducing emissions with the addition of direct injection. One distinguishing feature is that Nissan chose to use a ladder-frame bottom end design, which instead of using separate main bearings uses a ladder structure to secure the crankshaft. This is good for strength and rigidity and means the engine should be able to take more abuse.
The engine in this video was from a 2014 Nissan Altima that was totaled and was a working engine when pulled.
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