914 - Seeing 41.5" MAP on Takeoff

by Craig E Maiman in 912 / 914 Technical Questions 4 years ago

Experts,

During takeoff, I am seeing 41.5 in of manifold pressure (over the gate), but the Rotax manual indicates 39.9" is the max. I have the correct sensor (Kavlico P4055-30A) and it properly reads atmospheric pressure when the engine is off. The Garmin also has the correct sensor selected.

I don't see any TCU lamps illuminated during this time at all.

Could it be that my TCU was not adjusted properly (or at all)?

I never keep it over the gate for more than 60 seconds, so I'm hoping/assuming that there has been no damage done because of this...

Suggestions?

Thanks!

Re: 914 - Seeing 41.5" MAP on Takeoff

by Dave Anderson » 4 years ago

Dave Anderson

8 31 102

I thought that is the red line limit for the 914?

Report
Re: 914 - Seeing 41.5" MAP on Takeoff

by Craig E Maiman » 4 years ago

Craig E Maiman

40 123 504

39.9 is the red line limit, but I’m seeing 41.5”. Over the limit.

Report
Re: 914 - Seeing 41.5" MAP on Takeoff

by Spiros Economou » 4 years ago

Spiros Economou

2 25 92

I’m seeing 41-41.5 for years now when on full boost. I never had problems with the engine. Rotax says that the set point can be overshooted for a few seconds until it gets stabilized. In my case this is happening, I command full boost , it goes higher and then it drops to around 39.9.

Report
Re: 914 - Seeing 41.5" MAP on Takeoff

by Craig E Maiman » 4 years ago

Craig E Maiman

40 123 504

I’ll check again but I don’t think mine goes back down, it stays at 41”+, which is unacceptable.

Report

You do not have permissions to reply to this topic.

Title	Category	Replies
Engine issue on takeoff.	912 / 914 Technical Questions	16
RPM 914turbo	912 / 914 Technical Questions	3
914 TCU Computer What Connectors?	912 / 914 Technical Questions	1
914 Fluctuating pressures	912 / 914 Technical Questions	5
914 doesn't go above 4500RPMs! Help needed!	912 / 914 Technical Questions	10