MS19087
Well Known Member
Having put a few hours on the engine after first flight last week I am having a few issues - any thoughts or comments would be appreciated.
Background: IO-320 w/ Sensenich FP prop running one mag (Left) and one Plasma II (right) - Rated HP = 165.
1) Large rpm drop on both R&L when doing mag check: 150 rpm drop when Plasm is turned off, 130rpm drop when mag is turned off. This is way off - This should be more like 50-75 when Plasm is turned off, and nothing when mag is turned off.
2) Static RPM is 2250 @ 28" - right in spec. Flying WOT, I could only spin it up no more than 2350! Now I do not have main pants on yet, but Im still 350 RPM short of redline (250 short of Sensenich prop limit). Sensenich says even a re-pitch would get me only 25 rpm. LSE suspects leaky MP - that was pretty much ruled out. Others suggest timing is off. I checked the tach with a digital optical unit and it is spot on. I will check timing with my A&P on both units this Tuesday.
Has anyone seen a similar situation? I want to resolve this before continuing Phase 1 testing. Suggestions??
Background: IO-320 w/ Sensenich FP prop running one mag (Left) and one Plasma II (right) - Rated HP = 165.
1) Large rpm drop on both R&L when doing mag check: 150 rpm drop when Plasm is turned off, 130rpm drop when mag is turned off. This is way off - This should be more like 50-75 when Plasm is turned off, and nothing when mag is turned off.
2) Static RPM is 2250 @ 28" - right in spec. Flying WOT, I could only spin it up no more than 2350! Now I do not have main pants on yet, but Im still 350 RPM short of redline (250 short of Sensenich prop limit). Sensenich says even a re-pitch would get me only 25 rpm. LSE suspects leaky MP - that was pretty much ruled out. Others suggest timing is off. I checked the tach with a digital optical unit and it is spot on. I will check timing with my A&P on both units this Tuesday.
Has anyone seen a similar situation? I want to resolve this before continuing Phase 1 testing. Suggestions??