Rotary compression tester help
06-23-24, 07:03 PM
#1
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Rotary compression tester help
Hey guys I just bought a RCT-V5.2 rotary compressor from rotary CompressionTester.com
and it won’t give me pulse when I crank engine on front rotor but it does work on back rotor which I got Psi: 98 91 84 I don’t know what could be the problem I connect it right I have unplugged Main fuse EGi just won’t work on front rotor. If anybody know what went wrong or what am I doing wrong.I have a 1988 Mazda fc convertible rx7 13b non turbo hasn't being moved for 3 years
and it won’t give me pulse when I crank engine on front rotor but it does work on back rotor which I got Psi: 98 91 84 I don’t know what could be the problem I connect it right I have unplugged Main fuse EGi just won’t work on front rotor. If anybody know what went wrong or what am I doing wrong.I have a 1988 Mazda fc convertible rx7 13b non turbo hasn't being moved for 3 years
06-24-24, 09:37 AM
#3
I don't know what the threshold is for the rctv but I want to say anything below 22 i think is an effective 0. Of course it needs SOME compression to activate. Odds are you have 0 in the front if it isn't registering. Crank it with the spark plug out and listen for pulses
06-24-24, 10:46 AM
#4
Sorry to say it but if you're getting normal looking readings on one rotor but it's not giving you any reading not the other your problem is with the motor not the tester. Obviously this assumes you hooked it up correctly to test both rotors. As FDAUTO and Redbul implied, there's a lower compression threshold where the RCT V5.2 won't read anything/display zeros.
Another thing to consider is cranking RPM - if your battery is really weak, and you did the "good" rotor 1st, and then tried to test the "bad" rotor, it's possible that you sapped out the battery enough that the starter can't give you enough cranking RPMs to get a compression reading on that 2nd rotor. Maybe try again with a charger/jump starter hooked up.
Another thing to consider is cranking RPM - if your battery is really weak, and you did the "good" rotor 1st, and then tried to test the "bad" rotor, it's possible that you sapped out the battery enough that the starter can't give you enough cranking RPMs to get a compression reading on that 2nd rotor. Maybe try again with a charger/jump starter hooked up.
06-24-24, 12:49 PM
#5
Junior Member
Thread Starter
Oh
Sorry to say it but if you're getting normal looking readings on one rotor but it's not giving you any reading not the other your problem is with the motor not the tester. Obviously this assumes you hooked it up correctly to test both rotors. As FDAUTO and Redbul implied, there's a lower compression threshold where the RCT V5.2 won't read anything/display zeros.
Another thing to consider is cranking RPM - if your battery is really weak, and you did the "good" rotor 1st, and then tried to test the "bad" rotor, it's possible that you sapped out the battery enough that the starter can't give you enough cranking RPMs to get a compression reading on that 2nd rotor. Maybe try again with a charger/jump starter hooked up.
Another thing to consider is cranking RPM - if your battery is really weak, and you did the "good" rotor 1st, and then tried to test the "bad" rotor, it's possible that you sapped out the battery enough that the starter can't give you enough cranking RPMs to get a compression reading on that 2nd rotor. Maybe try again with a charger/jump starter hooked up.
06-24-24, 12:50 PM
#6
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Thread Starter
06-24-24, 12:51 PM
#7
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I don't know what the threshold is for the rctv but I want to say anything below 22 i think is an effective 0. Of course it needs SOME compression to activate. Odds are you have 0 in the front if it isn't registering. Crank it with the spark plug out and listen for pulses
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06-24-24, 07:54 PM
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