Originally Posted by TShort
I've spent tons of time thinking about the best engine for the -8 (obviously, as I have had the project for 15 years now ... )
I'd like to keep the plane as light as I can. Not super interested in an angle valve motor or a -390.
I'd like to know what is the best combo of weight / power available - specifically, manufacturer / engine shop and specific options. I'm planning on a constant speed prop. I'm guessing this will be an IO-360 of some variant, though I am totally open to some of the other options out there (-340, -375, -380, etc)
I'm sure others have pondered this and was wondering what people have come up with.
Another data point for you. I’m having a Superior IO-360-B1AC2 engine built by a local performance engine builder. This is a carb to injection conversion on a flying RV8 and wanted to minimize conversion work so I’m sticking with the vertical induction. He will port and flow balance the heads, cut special valve seats, balance the crank and rods, and use 9.5 pistons. He will test run and dyno it when complete and expects around 210hp. According to the builder, the head work alone provides around 20hp over stock and the balance comes from the increase in CR. I believe Lycon does similar head work with comparable results. Pushing these for extra HP is controversial as it adds additional stress, etc. Your actual mileage may vary.