Manchu16
Well Known Member
I have heard competing recommendations on adjusting the idle circuit on an MA4-5 carb. Both are A&Ps on the field and the only text reference I have found is engine warmed.
One says I need to get the engine up to operating temps, best to fly it for a bit. After landing run engine up to 2000 rpm for 30+ sec to get CHTs back up running full rich, reduce to idle, then slowly pull mixture. >50 rpm rise too rich, <25 rpm rise too lean
The other says I just need to get oil over 100*C, like I would for a run up. No need to go much higher. Then 1000 rpm, full rich, slow retard to idle then slow lean. >50 rpm rise too rich, no rpm rise too lean
One says I need to get the engine up to operating temps, best to fly it for a bit. After landing run engine up to 2000 rpm for 30+ sec to get CHTs back up running full rich, reduce to idle, then slowly pull mixture. >50 rpm rise too rich, <25 rpm rise too lean
The other says I just need to get oil over 100*C, like I would for a run up. No need to go much higher. Then 1000 rpm, full rich, slow retard to idle then slow lean. >50 rpm rise too rich, no rpm rise too lean