I'm trying to find a trust worthy rotary compression tester. I hear good things about the RCTV5.2 Mazda Rotary Engine Compression Tester. But can't seem to find any to buy. My 1985 Mazda Rx7 GS is running with low compression in the rear rotor. I did a compression test with a piston compression tester. I know there not very accurate but I just needed to see which rotor was low and it was the rear at around 60 PSI and the front around 90 PSI. So I'm trying to find a real and trust worthy rotary compression tester to get some better and more accurate numbers. Preferably looking for the RCTV5.2 Mazda Rotary Engine Compression Tester. Or if anyone else has some recommendations?

 

The eBay vendor who sells the RCTV5.2 tester ("rotarycompressiontesterusa") is out of stock however, that's usually because he is having problems getting parts to build his unit. You could contact him and see if he has a projected time frame for more units, if you are pressed for time there is a guy on eBay who rents one for a week for $59.99 + $12.50 for shipping, and he includes an $8.00 return shipping label with the unit.

 

I use the RCTV5.2, an early model died but it was after a client borrowed it so I don't fault the manufacturer. I couldn't wait for the repair turnaround time so I bought another new one - keep meaning to have this one fixed as a backup.