Dave;
I normally do my run up at 3800, and I usually get around 250 RPM drop, on each
side. I have about the same results as you at 4100 RPM.
In flight at 5300 RPM and 33" MP the EGT's are around 1550.
Rotax also issued a service letter at the same time concurrent with the overflow
bottle service bulletin, which deals with the correct mixture for the Anti
-Freeze mixture. The service letter is SL 912-009 and SL 914-008. Rotax is
calling for a mixture of 50% antifreeze/water
The overflow bottle SB914-025 only affects engine serial #s up to S/N 4,420.316
The Service Bulletin for the 912 series is SB-912-039
Jim Brown
N398JB
DJA727@aol.com wrote:
> Hi,
>
> Here are two questions for the group:
>
> 1. Anybody able to download the service bulletins on Rotax engines? I keep
> getting the dreaded little red X. Anybody know the mod details for the
> overflow bottle to vent it better to prevent pressure building up?
>
> 2. I am about to fly and was doing a run up today on the 914 engine. At the
> 4100 rpm setting for run up, I am getting 200 to 300 rpm drop and maybe more.
> When the power is increased to 5000 rpm, all the EGTs line up around 1500 and
> the drop is 100. At 2000, the drop is 100 also. I know that 300 is the
> allowed mag drop, but what do people see in operation. I hate to be at the
> maximum. The engine really probably needs to get out and fly - I am
> approaching 7 hours of run time. Any ideas?
>
> First flight now is being held back by the FAA requiring a self launch glider
> endorsement in my logbook. It doesn't matter that I have over 14,000 hours in
> powered airplanes! Frustrating!!!!
>
> Dave
> A227
> mini U2
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