How about apex seal length and clearance of the side housing and apex seal edge? Seems like the after market seals I measured, atkins and hurley, are just a tad bit oversized in length. I am talking like 80.02 mm to 80.05 mm. Since the rotor housing width is right at 80mm, this means they will not be straight until the sides wear a little. Has that been your experience also, ito?

Im sorry I just checked back in..

I was wondering about the clearances of the eccentric shaft.

(I know I am gonna phrase this wrong) When you install the front spacer,thrust needle bearning,thrust washer/balance weight,sprocket and drive gear.

the manual states the tolerable play is 0.040-0.070 mm

The max being 0.09 mm.

In your experience is it common that a 93 with 60k miles on it will be out of acceptable levels.



How close do these actually come to being out of spec?

Yes sir. Now we are talking. Many people have had problems with the atkins because of this reason. Since Dave Atkins at first did not address the issue to measure his seals many people just installed the seals with out measuring and had many problems. I measure every single seal even the factory ones. I even measure brand new rotor housings. I know they are new but I just don't care, I want to know, I have perfect parts instead of hoping and guessing Im getting perfetc parts. Apex seal length has to be .0015 of an inch smaller then the rotor housing width. This way when the engine is assembled and under a load, the smaller tip of the apex seal will not push itself over the longer part of the apex seal and create blow by and loose compression.

Uhoo thanks for that bit of advice.

It's a no brainer but I am new and would have not thouht to measure even the stock parts.

If they are(apex seals that is) too long can they just be block sanded down to the correct length?

Besides regular bearing to eccentric shaft clearance, I have found that .0025 end play has brought me many great results with bearing life. When I write .0025 I mean 2 thousands and a half of end play. I have found some engines needing a different end play spacer after tearing the engine apart. I have found too much end play. Sometimes .004 and up too .006. Too much end play will try to make the engines main bearings walk away from the stationary gears.

Yes block sanded and check the apex seal length every 10 strokes. Your going to take a while but a really good and clearanced engine will make you a better engine builder and a happier one. And don't forget your giving a better reputation to the rotary engines reliability.

Yes block sanded and check the apex seal length every 10 strokes. Your going to take a while but a really good and clearanced engine will make you a better engine builder and a happier one. And don't forget your giving a better reputation to the rotary engines reliability. [/quote]

Hey Im just trying to learn as much as I can for my car incase a nuclear bomb explodes and the only survivors are me and my Fd https://www.nopistons.com/forums/pub...#>/biggrin.png

Yes block sanded and check the apex seal length every 10 strokes. Your going to take a while but a really good and clearanced engine will make you a better engine builder and a happier one. And don't forget your giving a better reputation to the rotary engines reliability. [/quote]

Hey Im just trying to learn as much as I can for my car incase a nuclear bomb explodes and the only survivors are me and my Fd https://www.nopistons.com/forums/pub...#>/biggrin.png [/quote]

I wish I had some info. like this many good websites when I was learning. I created a couple of bombs myself when I first started. Especially in the engine timing department. But that was 15 years ago. Thank god I was loyal to this little engine and did not give up.

wow thats some good stuff judge :bigok: its always great to see someone who actually wants to build good motors, i used to work at a dealership, and we used to look at all the mana motors with a flashlight, mostly junk



mike

When I sit down to assemble any engine, by the time im done with all the clearance my back hurts and it usually takes about 4 hours or more. But is all well worth it.