oldtymeflyer
Active Member
- Joined
- Aug 6, 2013
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Ive got a problem. . .or maybe not.
Usually, the engine on my 1967 180hp Arrow develops 2700 rpm for take-off and I have to reduce MP (to 25 in.) and rpm (to 2500) after take-off.
Recently, I noticed that at full power for take-off the engine only developed 2500 rpm. It was hot (about 90°) and density altitude was a little higher than normal (3300 as opposed to 1100). Earlier this week the DA was lower (2300). While acceleration and climb were better, the engine still only developed 2500 rpm.
When I have been at higher altitudes (Colorado Springs and Santa Fe), my recollection is that manifold pressure was a lot lower than at my home base, but the engine still developed about 2700 rpm.
Do moderate changes in density Altitude affect rpm or only manifold pressure? If not normal, what should I be looking at as the cause of the rpm reduction?
Id appreciate any information you can give me.
Thanks
Usually, the engine on my 1967 180hp Arrow develops 2700 rpm for take-off and I have to reduce MP (to 25 in.) and rpm (to 2500) after take-off.
Recently, I noticed that at full power for take-off the engine only developed 2500 rpm. It was hot (about 90°) and density altitude was a little higher than normal (3300 as opposed to 1100). Earlier this week the DA was lower (2300). While acceleration and climb were better, the engine still only developed 2500 rpm.
When I have been at higher altitudes (Colorado Springs and Santa Fe), my recollection is that manifold pressure was a lot lower than at my home base, but the engine still developed about 2700 rpm.
Do moderate changes in density Altitude affect rpm or only manifold pressure? If not normal, what should I be looking at as the cause of the rpm reduction?
Id appreciate any information you can give me.
Thanks
