normal compression numbers
 

does anyone know the compression numbers for a 1988 FC N/A? mine is at about 119600 miles on it and has about 80 psi in the back rotar. and i think that is low. and i checked the FAQ and i cant find anything about compression. :cool:

Look in the FSM linked to in the FAQ.

And yes...80 is low. Time for rebuild.

ok and also the front rotar has about 100 psi is that good.and if so what do i do do i need to rebuild the whole motor or just half? (according to the person i bought it from.)

If you are going to have the engine apart already...you will want to inspect everything and make sure it is all in spec. If it were me...I would replace all the seals (apex included) to ensure it will run longer. If you only rebuild 'half', there is a good possibility that you will have to tear it apart again not to far down the road to do it all again.

100 psi is not bad at all. When my engine lost compression, it was the rear also, though I kept on trying to get it started (this was before I knew ANYTHING about the internals of the engine) and managed to totally screw up the housing from dragging the blown apex seal all around the inside of the engine. I wouldnt keep running it or you will risk damaging the housing...and they get expensive.

As far as what you will need for the rebuild, check out the 2nd gen archive...there is a thread in there that talks about what you will need and how much they cost and where to get them from.

Good luck.

im going to do it myself well i will try. so if i screw up i have a machanic that will help me for free. and i bought the car becouse i love rx7s and it was only $600. and I also just turned 15 and it has been hard to get people to help me. so thank you.

No problem. I am 25 and have YET to rebuild one on my own. I will be in the next year though, once I get into a house. I will live in the garage!

There is another young'n on here that just rebuilt his rotary and I think he is the same age as you. Felixwankel is his forum name. Take your time and do it right. Look up his threads. He also have a video of the progress of his rebuild.

Good luck..and have fun.

70 psi is Mazdas number for a bad motor. So 80 is getting to be time for a rebuild. Do the whole thing instead of half.