Happy Thanksgiving. Enjoy family time.
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These numbers are not unusual for a faster running engine. The reason is that the air in the intake takes some time to accelerate and slow down, so by having an intake pipe of the right length one can arrange for air to keep flowing into the cylinder even after the piston has passed BDC. Even 60 degrees after BDC would be possible on a racing engine, however it would run poorly at lower speeds.That is when the exhaust pressure in the cylinder is still quite large and it will affect the intake stroke.
When you build an engine with a compression ratio of 4-1, 5-1 or 6-1 the entire cylinder volume is calculated and when you give it 45 degrees after BDC, what will be the remaining compression ratio of the engine !?
I usually tune the engine this way, maybe a little more but never 45 degrees after BDC
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