I have a first gen. with a tired engine and I want to bump it up a bit. I plan on installing a used Japanese engine and swapping the front cover and oil pan to make it fit in my first gen. My question is, if you have a couple pallets of second gen. engines how can you tell which ones are series 5 engines.

Tried the archives and the search without luck

thanks

 

the top Dynamic chamber on both engines. Series 4 will be black writing that is indented "13b injection" and same with the series 5 but the writing is not black and it is above the metal. I will get you some pictures.

 

The BAC valvle is on the oppistie side or the upper intake manifold also on s4. S5 it is on the passenger side (If I can remember, its been awhile since I've seen my baby) and the S4 BAC is on the driver side of the upper intake manifold. Someone please feel free to correct me if I'm wrong.

 

You are correct- I think :P i know mine is on the drivers side

 

DC, photos would be great - thanks
Can you tell me what the "BAC Valve" is?
I have a first gen with everything stripped off of it and I an running a Dellorto, so I do not have a lot of valves.

Thanks guys

 

a few things...

if youre talking about jspecs, theyre all turbo engines. Japan didnt have any nonturbo 13b engines after 85. We all know what it takes to put a turbo engine in anything that wasnt originally a turbo, so I dont think you wanna go there just to freshen up...

You can always tell an s4 engine and s5 engine apart by the oil metering pump...on an s4 car it is small, metal, and has a metal rod physically connecting it to the throttle body. An s5 has a larger, round, black plastic, has about 10 wires coming off it, and has no connection to the throttle body.

Other notables on s5 engines are dual throttle position sensors, threaded holes in the rotor housings above the trailing plugs, a temperature sending unit(below oil pressure sending unit) that has a flat terminal vs a round finger on a s4. Also an s4 has a aluminum thermostat housing with 2 bolts, and a s5 has a black plastic housing with 3 bolts.

 

What year is mine, I do have duel tps, and threaded holes above the trailing plugs but the omp looks to be the older one (metal rod). I tried asking before but didn't really get a responce. thanks

 

You have some kinds jspec hybrid **** somebody has mismatched for a specific purpose. That is why no one had a definitive answer.

You have the s4 OMP and rod, but an s5 TPS. Intake looks s4, front cover s4, turbo oil drain pipe s4, rotor housings and rear iron look s5. Alternator is s5, water neck is hacked up and unknown but appears to be s4. Throttle body and elbow appear to be s5, BAC adn wire on it are s4, turbo and metal split pipe are s4, TPS wiring is s5. The water temp sending unit is s4, and btw you have no oil pressure sending unit, you might want to put one on. The center iron is s4, because the knock sensor is on it instead of the front rotor housing...

You have a little bit of everytyhing on there, but Im pretty sure your block itself is an s5. Most of the stuff on it looks s4 though, as far as electronics and stuff. ITs gonna be damn fun getting that thing to work in an aspec car using a stock control system...

 

hypntyz7

Thanks for the info! I had a funny feeling that some parts were series 4 and some 5. I just hope the rotors are series 5. Here's the story on this crazy motor. I bought it about 3 or 4 years ago from http://www.risingsunengines.com They told me that it was the series 5. They said that it is a brand new motor that was being held at Mazda Japan for warranty reasons for so many years, and when Mazda didnt need them any more, they cleared them out. About the same time I bought this engine, I talked to another engine shop in Austrailia who said the same thing and that they bought some of these motors. They had about 20 of these motors at the time. As far as I can tell by looking, all of the parts look new. I shined a flashlight into the spark plug holes and watched the rotor as I slowly spun the engine. Both Rotors are clean and shiny with no type of carbon buildup either in the combustion chambers, or next to the seals, not a trace! All of the orfices are clean and no signs of dirt. It did have a wiring harness that was cut off. It didnt come with an intercooler. When I manually spin the engine by hand with the plugs removed, I can hear a whoosh as the rotors compress and it sounds strong. There's even a little whistle to it. Do you think its possible that Mazda Japan just pieced these engines together using series 4 and 5 parts so that they would have some complete engines? Or maybe getting rid of all the individual parts made some engines. Anyways, I guess I will have to go with an aftermarket efi huh?

 

You wont have to go with an efi system, you just need to sort out what stock system youre gonna be using(s4 or s5) and find the appropriate stuff for that(what may not already be on the engine) and use the wiring and sensors/injection appropriate to that year, and it'll work.

You can take an s5 engine and put s4 wiring and injection on it and it'll work great. Keep that s5 alternator, it is an upgrade. Keep the flywheel that is on the engine, as it is part of the counterbalance(and hope like hell that mazda knew this when they installed it :-)

IF you need more help identifyihng **** and sorting this out email me or call me...all my contact info is on my webpage www.rotaryresurrection.com