Quote:
Originally Posted by U47
With our 1820's and 3350's we went by the manufacturers recommendations, but certain conditions changed those circumstances that the Navy would indicate, so the interval varies , but is generally between 700-1,000 hours. I understand the US Forest Service used to set 1,700 hours as a TBO on R-3350s, but would allow extensions if an engine met certain specs and was in an oil analysis program. I do not know if their engines were turbo compound like we had in the navy because they are only using 100LL and we were using 145 / 115, I ran as a steady diet in my 65 VW Beetle using day old fuel samples.
From 1992- until the 9/11 attack closed most airports without a pass I always used 100LL in my 455 LeMans.
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3350 turbo compounds rarely made 700 hrs in service. Too complex and way too many fire warning lights!