Alright guys, so my buddy and I, Manny (2Fast7S), are just about finished rebuilding his 13B-REW. But we're a little confused about one thing. The rotor assembly.

All the apex seals, side seals, corner seals and springs are in, and we have compression, but here is the question. Is it possible to put the rotors in incorrectly?

The e-shaft turns freely, and for every HALF turn of it, we get 3 pulses of compression. Is that how it should be? For every HALF turn there are 3 pulses, so for every FULL turn there are six. Should it be different then that?

What I mean by putting the rotors in incorrectly is... they have to be off-center with each other, as in, if they were stacked, they would not look like perfect triangles (epitrichoids, I know, I know).

So would having 3 even pulses per half turn mean we put it back together correctly?

We'd rather not take it apart, we just took the end plate off today cause we saw a corner spring sitting on the dolley the engine is on, so we put that back in.

Thanks in advance.

James

 

o the rotors meed to be out of line, ans in if you stood over them it should look like the star of david one right side up one inverted. and by 3 even pulses are they coming out of the same rotor hole?

 

I don't think it's possible to put them in wrong... When you're building the dagwood (lol), you want the first rotor gear-down, and the last rotor gear up. Aside from that, they can only go in one way (mirror images of eachother < > Because that's how the E-shaft is setup.

Think about it, there are 6 different compression pulses in a 2-rotor (so that's right), so if you turn it half-way there are 3 (of course).

However, after seeing that corner-seal spring sitting there, I would be apprehensive... I know the feeling after everything's put back together and torqued down, and you're just wondering if you did something wrong. LOL

 

If you have ANY doubt you did it it wrong pull it apart now

And no you really can't put them in wrong...the lobes on the E shaft say it goes one way...and that is it.

James

 

Nice avatar Wankel but i'm Mormon too.

 

If the motor is together, and it spins freely...it's all good.
the rotor an only go in one way.

Well, technically, you can swap them front rotor versus rear rotor, but that's not that big of a deal.


-Ted

 

Thanks guys, that was very helpful. And the motor is together, and does spin freely.

Just to double check, a half turn that puts out 3 pulses is good, correct?

 

Sorta kinda...yeah, something like that.

The rotors spin once for every 3 turns of the eccentric shaft.
So if you spin it just right, you'd get 3 pulses (two from one side and one from the other) from a half spin.

Or just pull one trailing spark plugs and spin the engine 9 times to hear all 3 sides of one rotor.
Put the spark plug back and yank the other trailing and repeat (to hear the other rotor's 3 sides).


-Ted