Are theres any noticeable differences between a series 4 and series 5 engine?

The engine i might be looking at is out of the car, just swapped cause it was believed to be bad, but the new engine has same problems. It came from a series 4, but the mechanic said that the engine was from a previous swap to a series 5.

S4 = 146hp lower compression rotors

S5 = 160hp higher compression lower weight rotors



main difference is power and compression ratio. if you can get a S5 get it... more power https://www.nopistons.com/forums/pub...IR#>/smile.png

thanks. But i wanted to know if there was something visible in the engine itself that i could tell if it was a series 4 or 5. cause like i said, the engine is out of the car. https://www.nopistons.com/forums/pub...IR#>/smile.png

The series 4 will have a mechanical oil metering pump.

S5 has VDI

whats a vdi?? and how can i see it??

It refers to the way the intake manifold is designed. Also, the series 5 doesn't have mazda stamped on top of the intake.

Are u sure? My NA 1990 engine has "mazda 13B injection" stamped on top of mine.





If you are talking about an NA look for parts stamped with N350 for series 5. On turbo series 5's look for N370. This is assuming the engine has been repaired/replaced with the correct parts. Most obvious is whether or not the OMP has wires running out of it. (hint series 5)



Mike

My mistake. :sleepy: