Fast idle at end of flight .. wisdom sought
Hi guys,
On a few of my warbirds, I have had some issues with engines whose idle speed, at the same throttle setting, have greatly increased RPMs at the end of the flight vs. start/warmup and taxi.
Sometimes this can cause issues with the plane wanting to land much too fast, requiring a go-around and retrimming of the low-end. Not a lot of fun.
Since these are mostly well-cowled engines, I have assumed heating was perhaps an issue .. and I've seen it with both side-carb and rear-carb engines from multiple manufacturers.
Is this a familiar problem with some routine items to check? I've varied the low-end mixture, tried different throttle linkages (was worried about nyrods expanding when warm), and improving airflow to the carb, so far without much success.
Any thoughts from those who may have been there/done that?
Dave McQ