Every Nissan 240SX produced for the North American market came equipped with the KA24E or KA24DE engine. The factory engine has been criticized as being underwhelming, but it still remains a common choice for builds. However, the most popular engine swap available is the famous SR20DET. A single turbocharged inline four cylinder, the SR20 and variants is one of the more popular engines used by Nissan worldwide throughout the 1990's.
Although we focus on the SR20DET from the 180SX, 200SX, and Silvia models, other versions include the SR20DE (naturally aspirated) and the SR20ET (single over head cam version). The SR20DET uses a DOHC, 16 valve setup with a timing chain system. Power output ranges from approximately 200 hp up to 245 hp in the desirable S15 "black top" model. These variances are most easily explained by the two different turbos used, a T-25 or T-28, but some differences can be found in the head as well.
There are four popular variants of the SR20DET that are commonly sold by used engine shops, often importing these engines from various sources in Japan. The S13 "black top", S13 "red top", S14 "black top" which added variable cam timing for the intake camshaft, and finally, the S15 "black top". When purchasing a used motor, it is very helpful to know exactly which version you are receiving. Although most head and block components are the same, some oil and coolant passages are different, requiring a few variants of head and other gaskets.
Listed below are a few featured products for your SR20DET, but if the engine calls home to a Nissan 240SX, you can view our wide array of products, including brakes, suspension, and wheels.