A little over two and a half years ago, we brought you this article on NRE’s 260 cubic-inch turbo LS engine outfitted with twin-(well, mirror-image) 60mm turbochargers built for an offshore racing class. In the first installment, the engine spent five whole minutes at wide-open throttle (7,300 rpm) making four-digit horsepower the entire time.
Less than two weeks later, we posted a follow-up article in which Nelson had run the engine for an hour at WOT in order to validate the combination for its intended form of competition, and then recorded the teardown of the engine, showing that it was more than ready to go back together and keep doing what a turbo LS was designed to do.
In that second article, Nelson shares a lot more details about the parts that went into the build, as well as some of his thought processes throughout the design and development phase of the engine. What is impressive is that such a small-displacement, high-strung engine not only survived such a torture test, all while making 1,200 horsepower, but that it did so with so little wear that Nelson was able to reuse the main and rod bearings after an hour on the dyno.
It’s not only a testament to NRE’s engine-building abilities, but also the parts he used from Holley EFI, Callies Crankshafts, JE Pistons, Clevite Bearings, and Dailey Engineering, among others. Even two and a half years later, the feats accomplished here are still impressive, no matter what angle you look at it from.