Use a regular compression
gauge with the Schrader Valve removed to perform this procedure.
Warm up engine
to operating temperature, then turn off ignition.
Disable ignition
and fuel system by performing the following:
Remove EGI
fuse.
FC owners:
Disconnect the crank angle sensor's electrical connector (white clip with
4 wires running out)
FD owners:
Disconnect ignition coil harness located behind power steering pump.
Ensure E-Brake
is engaged.
Remove trailing
or leading plugs (but not both) from either front or rear rotor
housing. We prefer the trailing (Top) as they are easier to get to.
Connect compression
gauge to spark plug hole.
Have second person
in car depress clutch and accelerator pedal fully, while cranking for several
seconds.
Watch for readings
on three successive bounces (you are looking for 3 even bounces).
Reinstall spark
plug and remove plug from second rotor housing.
Repeat steps 6
& 7 for second rotor housing.
Note: if you do not remove the
Schrader (relief) valve, you can also hold the valve down during the test and
watch the needle bounce for each rotor face. However, you will not see actual
compression readings. Once you have confirmed three even bounces, you can repeat
the test without depressing the relief valve to ascertain the compression reading.
Diagnosis
3 even bounces
of 85 PSI or above is GOOD. Readings above 110 PSI is GREAT!
3 even bounces
of less than 85 PSI: indicates that motor is tired, and indicates engine should
be rebuilt before causing damage to rotors or rotor housings.
2 high and 1 low:
indicates problem with side seal (stuck, cracked, broken, etc.) Engine needs
to be rebuilt.
1 high and 2 low:
indicates problem with apex seal (stuck, cracked, broken, etc.) Engine needs
to be rebuilt.
NO bounces: either
incorrectly installed gauge or destroyed rotor and housing.
Banzai
Racing Inc. & Associates are not responsible for any adverse effects arising
from application of this procedure.
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