Hi all i was hoping to have this all done before i posted for the first time but hit a major snag and its because i didnt mark what one, was what.
ive got a 2005 192 which im rebuilding the engine on. ive now completed the rotors BUT arron cake mention there is a front and rear rotor but in the manual it too mentioned the front and rear rotors.
how can i tell which one is the front or rear rotors?
also when rebuilding should there be a certain place or direction for the rotors to be in for timing? do i need to mark the rotors?
or do i just shove the rotors in however i want just making sure the side with the gear goes on the side with the stationarys?
ive tried to do this to the best of what i can find on the web but this info i cant find anywhere?

 

wow...

Your main issue is going to be balancing each rotor has a different weight.

Engines can be different without taking note its hard to say, you didn't take note if your side seal number/letters or take any pics or anything?

Also what is a 2005 192?

 

The 192 is a four-port engine sold everywhere except north america.

Yes, if you're that far into a teardown without noting where every seal went, you're in a world'o'trouble.....each seal is fitted by size to it's own slot - put a long one in a short slot and it will jam and leak.

"Never put a long one in a short slot" -Ron Jeremy.

 

Well if hes replacing the seals hes good to go, I hope hes replacing his seals seeing how thats the #1 cause of low compression :/.

The main issue is the rotor weight, you might be able to call mazdatrix or pineapple and see if they can give you a hand.

 

yes all seals and bearings have been replaced.
so i cant continue with the rebuild till i find the weights? which weight is the front and which one is the rear? which one should be the heaviest? sorry for being dumb BUT i know if there a next time.

 

He's using the same rotors by the sounds of things ....balance will be the same....anyway...I will post a picture when I get home if no one has answered your question

There are cutouts on the rotors by the corner seals that determine front or rear...just can't remember which way they go without the pictures

 

ok brill thankyou will be good to know for sure before commencing.
also when laying them in is there a certain apex that needs to go in a certain place? not sure if all the sides are the same or not... confused.

 

I'm not talking about the apex seals, they will obviously be replaced.

Factory side seals come in about twenty different lengths, replacements are sold oversized, and then precision fitted to their specific slot.

....or just reused, mixed and matched out of the tupperware they were kept in during dis-assembly, apparently.

 

no, im talking about when you put the rotor onto the irons is there a specific direction the rotor needs to point? the apex which so and so written on points down near the exhaust port OR are all ends of the rotor and sides the same?
see its wow hard to get the specific direction of the rotors within the housings or weather or not theres a front or rear one.
again all seals and bearings have been replaced including the side seals which i have ground to fit.
hoping dannobre can help with which one is front and which is rear.

 

That's what I meant Front and rear need to be front and rear, if I remember correctly they aren't interchangeable. Luckily I had pictures I know there's a way to tell on the rotor, I'll try going through the manual again.

The renesis uses precut seals by letter designation.

You can get cut to fit seals and do them yourself, I used 400 grit sandpaper. My friend with the steady had did all the cutting.

But if you want to save time get the pre-cut seals and a dab of Vaseline so they stay in place.

 

Look for an F and R stamped on the rotor. Mazda usually stamps them for front and back. If you don't see the stamp I suggest you check http://www.rebuildingrotaryengines.com/ Should find an answer here.

 

***edited May2021***
The intake port cutout on the side edge starts out blunt and tapers off, the sharp end is the rotation direction. Then whichever side the rotor gear is on

 

Damn, Team's right again!

 

The rotation is simple. Intake port, spark plugs, exhaust port. If you can determine that your going to place a rotor that spins in the direction that would have the exhaust cuts on the trailing side of rotation.


The exhaust cut on the rotor is on the trailing side (Left) as pictured. Make sure the rotor is positioned like this when you put it together. This is a front rotor on the front iron.
Rotation is from left to right in the picture. Point one rotor apex up (top of engine) and the second rotor 180 degrees off from the first.

bridgeportrenisis004-3.jpg?t=1244086081

 

well big thanks to all, had a good read on the web and here and the comments above thankyou.
rebuild almost done..

 

Sorry to revive such an old thread, but the rotor placement is incorrect in this post. The rotor direction is in the direction of the sharp side of the chamfer, not the blunt side. The chamfer "points" to the direction of rotation, like an arrow. This was confirmed on the RB and Mazdatrix site, but more importantly this was how my factory engine was assembled. Just wanted to leave this for people of the future...

 

thank you Kevin, no problem for having my old mistakes pointed out because it’s for the best and I’m sure there are more out there. Occasionally I stumble upon and correct them myself, but you got back here before me. I don’t even remember making the post or where the info came from. Most likely I had the rotation direction wrong because that can still get me now if I’m not careful despite 10 more years worth of experience.

Good job btw.