Altitude issue with spits also (1a + 100oct).
At around Angels 11, I get sporadic engine ticking and 50rpm fluctuations (magneto drop?) which quiets down if rpm is reduced to 2600. Going higher to within 15k I have to drop boost to 2lbs. max or the engine feels like it's about to shake out of the aircraft. ASI shows 140 IAS at that altitude and continually drops to around 110 at 22k.
I'm enjoying the low altitude speed increase of the 100oct spit. Pushed one to 305 miles on the deck with 12lbs full boost / 2600 rpm and rads at 35%. Just watch your temps. They climb much faster (as it should).
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