Biggest Killer in the Rotary World? My original favorite Apex seal would have been the Ceramic Apex seal ran by Mazda and the 787B , the four rotors and Le Mans ; this is a very good quality Apex seal that will sustain heat , sustain boost , sustain nitrous and last an extremely long time as long as you don’t detonate and a modern problem when you’re pushing the limits with your rotary cars is if you don’t get good fuel delivery or you have a little bit of pre-ignition you’re going to detonate and this was the biggest killer in the Rotary World ; whether you are using an oem seal or an aftermarket seal , if the seal breaks you’re destroying components inside the motor