Quote:
Originally Posted by tomcomet
Up here in Canada I am flying around in 0 to -20C and even then I am breaking 400 degrees on #1 rear often and have to crack open the rear cowl flaps. Not normal and not great!
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Your rear engine is a completely different story and imho it isn't an airflow issue.
The rear engine (except for cyl#1) is way happier than the front....higher fuel flow, gentler CHT rise, consistently cooler temps, etc. From what I see the #1 cylinder is an isolated issue.
Action items:
- Check fuel flows as per TCM SID using calibrated gauges.
- Check timing using a digital angle finder, not the old buzz box.
- Talk to GAMI about the #1 cylinder...confirm correct injector shipped and installed in correct cylinder.
- Fly and record an LOP mag test. A bad plug or wire can cause high CHT's.
- Clean injector and confirm flow from fuel injector block.
- Check for vacuum leak in intake manifold to cylinder.
- I hate to say it but also borescope the #1 cylinder just to make sure cylinder walls and valves look ok.
- Let's park ours sided by side, decowl and compare baffle seals.