WHAT DOES JDM MAZDA RX-7 FD 13B-REW ENGINE FOR SALE MEAN?

For every apex (corner of the triangle) to the rotor, there’s a seal that keeps the corresponding chamber airtight, and each apex seal is loaded using a flat spring to maintain connection with the housing. Apex seals and springs are envisioned to don out after about a hundred,000 miles or less, but there are other causes of apex seal failure.The