Building A K20 Powered Miata

949Racing is installing a Honda K20 engine into their project car and explaining everything as they go. The engine will be built by Hytech and produce an estimated 260 horsepower to the wheels. The engine will feature custom Hytech CP pistons, Carrillo H-beam rods, custom Hytech cams, ported heads, and be controlled by a Hondata K-Pro 4. A really nice thing the author did was tell how much the engine build cost and then compare it to other engine builds for reference.

Not including a $1000 Kpro4, it looks like the core, build and a few ancillaries will cost around $8k for 260whp on pump gas. That same money including the $5k for Kmiata swap kit and Hondata, spent on a BP N/A would net you about 190whp on pump gas and not last quite as long. 200whp if running ITB’s. That same money ($13K) spent on a BP+Rotrex would net you about 370whp on pump gas and last about as long. 400whp if running race gas or E85. This last bit is not conjecture. We have a good customer that has way over 50 race hours on a 400whp BP build (race gas) that was built for a lot less than $13k. He made 440whp but it was undriveable on the big end and broke the driveline too often. At 400whp it was just the occasional halfshaft wearing out.

Source: MiataTurbo (build thread)

Original: Engine Swap Depot