Carlos,

Bruce Turrentine's 13B video shows that you can get a good estimation

about a

short block engine's compression by turning it with a wrench and

listening for

equally spaced and equal character exhaust pulses.  I can watch the

video again

and forward the exact details if it will be helpful.  If enough of the

cooling

system can be hooked up, it can be pressurized to 15 psi and checked to

see if

it will maintain this pressure. This will help assess the side seal

integrity.

The appearance of the rotor tip as it passes the exhaust port is also a

useful

indicator.

I have not done these tests myself, only forwarding the info. derived

from

Bruce's video.  It seems the majority (but not all!) are recommending a

tear

down, inspection and rebuilding necessary parts if the engine is going

into a

plane.  However, Tracy flew over 800 hours without rebuilding a 100K

miles

engine, so it sure ain't gospel!

If there is enough interest, it might seem reasonable to grab a junk

RX-7

transmission and cut off the bell housing so a starter could be mounted

for

these tests.  Anyone know if there a lot of variation between years and

models,

other than manual-vs automatic, that would require more than one
starter-mounting arrangement?  Obviously, if one already has their

redrive, it

is not an issue as this will mount the starter.

Scott Gettings

It appears that the TX bolt circle is the same from year to year.

I tried that sound trick.

The exhaust pipe needs to be disconnected. It helps if the manifold is
off as well.  What you need to do to make it work well is take
the plugs out of the front rotor and check the rear. Then take the plugs
out of the rear and put them in the front to check the front separately.
Or vice versa. Things are too confusing otherwise.

Paul Lamar

carlos noto wrote:

I got everything off the engine you can see the apex seal from the exhaust
port. I've turned the engine and I've hear the compression, but I never
listen from for what you said. I never bought Bruce's video. I can do all
those check with in 1/2 week. I'll be working about 13 hours a day at my
job, so I can't do it right now. Can you do the coolant compression ck with
an air pump? I'll let you know the results of all the cks.

 
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