exhaust valve cam

  • Valve Timing Events and the Order of Importance - Engine ...

    Apr 15, 2016 · Exhaust valve closing (EVC) 4. Exhaust valve opening (EVO) Overhead cam timing can be tricky on some engines. Always refer to the OEM timing procedure so you know how the timing marks are supposed to be aligned. On some engines, you have to count the chain links between sprockets to get the proper alignment.

  • Exhaust Reversiontracing

    Backpressure in the exhaust system causes reversion. It gets worse with excessive Valve Overlap and improper Valve Timing. Performance camshafts take advantage of scavenging at high rpm. If the exhaust system is too restrictive for the cam, reversion can .

  • Cam Performance