The Full Function Engineering Oil Metering Pump (OMP) Block-off plate really cleans up the engine bay and reduces a bit of complexity from the 13B engine. However, this modification requires pre-mixing oil into the fuel at a ratio of 1-2oz of oil per gallon of fuel at a minimum.
The reason for deleting the OMP is because rotaries burn engine oil from the crankcase during the operation of the engine to keep the apex seals lubricated. Motor oil is not designed to be burned, it lowers the octane rating and knock threshold of the engine which is not good for emissions or making power, and leaves carbon deposits inside the engine. By comparison, premixing 2-stroke oil that is designed to be burnt results in a cleaner burn, more power, less engine wear and deposits, and arguably reduced emissions.
The Oil Metering Pump is bolted to the side of the front engine cover and pumps engine oil from the crankcase up through these clear tubes and into the combustion chamber. This photo is from a “FC” RX-7 which uses four oil injectors compared to the FD which uses only two.
During the time of the install, we did not have the correct plugs for the rotor housing to replace the oil injectors. In a pinch, we simply un-plugged the OMP which essentially did the same job as removing it. We plan on replacing the OMP with the Full Function Engineering Block-off plate in the near future.
With the Full Function Engineering Idler Pulley and Block-off Plates installed, we re-assembled the intake and were ready to go. Removing the Air Pump took a lot of weight and complexity off our track-engine configuration. We can now see the little turbo which is no longer hiding behind the Air Pump.
With this extra room, servicing the turbo and other areas in the engine bay is much easier, as well as it allows for extra room for a single turbo installation which will be happening in the future.
Stay tuned for the next installment of Project FD RX7 Restomod.
1 comment
Wow, all that complicated mess definitely needs to go for a track car!