Rotary Compression Gauge
11-24-02, 09:24 PM
#1
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Rotary Compression Gauge
Where can you get them??? I heard there pretty pricey... We have a standard compression gauge but I heard they dont read right on a rotary engine... Nothing like poping a plug out and turning it over to make shure you still have compression 
11-24-02, 11:29 PM
#2
This is how the Haynes manual explains how to do it for the FC3S by using a regular compression gauge...
1. Clean area around spark plugs, then remove the two upper spark plugs from the engine.
2. Block the throttle wide open
3. Unplug the crank angle sensor. The fuel pump circuit should also be disabled.
4. Remove the check valve and install the compression gauge in the front upper spark plug hole so it won't hold a reading.
5. using the starter motor, crank the engine over at tleast seven revolutions and watch the gauge. The compression gauge needle should make three even bounces as the eccentric shaft makes one revolution. Two low bounces followed by a high one indicates a burned apex seal. A single low bounce usually indicates a fualty side seal. Record the gauge readings obatined.
6. Repeat the procedure for the rear upper spark plug hole and compare the results with this chapters specifications.....
Compression Pressure:
Limit = 85 psi at 250 rpm
Max permissible difference between chambers = 64-78 psi
--
Hope that helps. That is for second gens by the way.
1. Clean area around spark plugs, then remove the two upper spark plugs from the engine.
2. Block the throttle wide open
3. Unplug the crank angle sensor. The fuel pump circuit should also be disabled.
4. Remove the check valve and install the compression gauge in the front upper spark plug hole so it won't hold a reading.
5. using the starter motor, crank the engine over at tleast seven revolutions and watch the gauge. The compression gauge needle should make three even bounces as the eccentric shaft makes one revolution. Two low bounces followed by a high one indicates a burned apex seal. A single low bounce usually indicates a fualty side seal. Record the gauge readings obatined.
6. Repeat the procedure for the rear upper spark plug hole and compare the results with this chapters specifications.....
Compression Pressure:
Limit = 85 psi at 250 rpm
Max permissible difference between chambers = 64-78 psi
--
Hope that helps. That is for second gens by the way.
11-25-02, 12:22 AM
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Thanks man that is going to help out alot... I have a 79 with a 74 13b in it... But I am now I know what pressures to look for... Hell I am suprised I havent busted a seal yet I am kind of intrested in what kind of compression ratio I have after I passed a 305 s-10 with my car detonating like a... well honda ... thanks again...
... thanks again...
11-26-02, 05:59 PM
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Hey I just ran the pressure check... I have a na 13b it registerd 100 psi onfront rotor and 85 psi on the rear
what should it be running at... its a 74 13b I am shure it has high compression rotors in it... I am pretty shure there the older hi comp rotors not the newer ones...
what should it be running at... its a 74 13b I am shure it has high compression rotors in it... I am pretty shure there the older hi comp rotors not the newer ones...
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