Fullmetal

Is there a way to find out if an engine is a Zenki or Kouki from the serial numbers on the engine?

My5ABaby

iTrader: (7)

There's visual differences. I'm not sure on a lot of them, but the S5 doesn't have an EGR valve. You could find this info by searching.

RX3SP

iTrader: (62)

The easiest way to tell the difference visually is to look at the rotor housings above the trailing spark plug. The Kouki engine has a threaded bung for the knock sensor just above the trailing spark plug. The Zenki engine has a smooth casting above the trailing plug hole.

mazdaverx713b

iTrader: (91)

most that i've run across are Zenki. pretty easy to spot.

My5ABaby

iTrader: (7)

My post wasn't super useful, but damn... this one takes the cake.

FrankV702

iTrader: (14)

most of them that ive run across have spark plug holes

Fullmetal

I have a friend in Japan thats looking be he knows nothing about cars so I can't ask him to look for a specific part cause he wouldn't know what to look for and he doesn't speak Japanese so he can't ask. I've read somewhere that Zenki's have a two bolt flange on the thermostat housing and Kouki have three bolt flanges. Can anyone confirm this?

My5ABaby

iTrader: (7)

http://www.rotaryresurrection.com/2n..._s5_diffs.html