Radical SR8LM

Radical Motorsports announced the Radical SR8LM on 1 July, a 2.8L normally-aspirated motor producing 455 bhp with a rev limit of 10,500 RPM.

"Gotcha!" I hear you say. "Didn't you previously have a blog entry that stated 300 whp from a normally-aspirated 2.4L is improbable in the local context? So how do you explain a 2.8L engine doing almost 100 bhp more?"

Let's do the math.

Since Radical doesn't post up the power graph, let's assume peak power of 455 bhp is achieved at 10,000 RPM. This would yield a torque of 239 lb-ft at that engine speed. 2.8L is 171 cubic inches, so BMEP is 211 psi. Well within reason. By the way, Radical suggests an engine rebuild interval of 30 hours. This engine is not meant to be driven daily.

So logic prevails. I stick with what was stated previously and would require a lot more convincing that a daily-driven, locally built and tuned 2.4L normally aspirated engine revving to just 8000 RPM is capable of 300 whp.