Sung Kang’s New Engine For His 240Z Project Has Arrived

Sung Kang’s Datsun 240Z, fondly named Doc’, is slowly getting deeper and deeper into its overhaul. And recently, Sung’s good friend Eddie from Erick’s Racing Engines has dropped off Doc’s new heart.

This L24 engine is the 2.4-litre piece that powers the 240Z from the factory. But as these cars are nearing 50 years old now, the engine was in need of a bit of an overhaul. So off it went to Eddie’s facility where it was bored and honed. In this article, I’m going to tell you a little more about what that means.

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Walking CARPEDIA- Eddie from @ericksracing dropping knowledge about Doc’s L24. Amazing well of knowledge and great gift of teaching others. Thanks Eddie.

Posted by Sung Kang on Saturday, September 19, 2020


Boring an engine is done mainly for two reasons: repairing worn cylinders and increasing power. A machine is used to widen and taper the cylinders, which increases its size. This removes any wear from the inside, but also increases the engine’s displacement which will give it more horsepower and torque.

By doing this you can drill out the cylinders to a precise measurement ensuring everything fits perfectly such as piston rings, which in turn ensures the engine is running with good compression and no leaks from within the cylinder.

Of course, after you’ve made the cylinder larger, you need to match that with a piston that fits, so an aftermarket piston is needed to ensure you maintain compression.


Honing is a process that every engine will go through when it’s first built at the factory. It’s where the cylinder walls are prepped for use with a piston by adding small scratches in a crosshatch pattern. These scratches allow the cylinder wall to hold onto the lubricating oil more, which will assist in lubricating the piston rings. Without this oil, the rings would wear out very quickly.

Eventually though, these small scratches can be worn away, so you sometimes need to hone old engines again to make sure they’re in perfect running order.

Big thanks to Eddit for the motor, and we’ll keep you updated as we continue with the work on Doc’!

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