Engine temperature question

Discussion in 'General Harley Davidson Topic' started by mtworks, Jul 7, 2019.

  1. mtworks

    mtworks New Member

    Time to change the oil on my 2015 road king. Took bike for a 1/2 hr ride to get the engine warm. Decided to take engine temperature readings with my infared temp gun with my FP3 also hooked up. Readings were taken 1 min after stopping:
    Outside air temp 95 deg
    Front head 268 deg
    Rear head 296 deg
    Oil temp 221 deg
    FP3 engine temp 258 deg.
    This seems to be ok but what would explain the diff. Between the FP3 readings and the temp gun, or are they all about equal overall?
  2. jamesearl

    jamesearl Well-Known Member

    My guess would be the fins on the heads are doing their job.Keeping the oil a little cooler.
  3. Breeze3at

    Breeze3at Experienced Member

    Temps vary widely over different areas of the engine. Find the FP3 temp sensor and try an infared temp reading close to it. Probably will still be 2 different readings.