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Old 09-09-2022, 12:07 AM   #7 (permalink)
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ND Miata - '15 Mazda MX-5 Special Package
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Originally Posted by some_other_dave View Post
IIRC, the R and L series engines rotate the opposite way from the D series--and have the transmission on the opposite side of the engine bay! That means the mechanical part of the swap is more involved with them, versus the D or B swaps. (Not sure about the K series.)

I like KISS--D-series to D-series is the most straightforward swap, plus you already know you like what you have. If you're interested in better freeway MPG, you may be able to find a taller 5th gear for your transmission.
K series spins the same way as R and L. And, I agree with this logic, it's certainly easier and more cost effective.

The D16Y5 and D15Z1 both have a roller rocker valvetrain and lean burn, which is good for a fir bit of extra economy.

A 5th gear swap is not terribly complicated either, and is likely going to have a bigger impact on highway economy than changing engines.
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