Oh, Most Knowledgable Ones,
ECi's Classic Cast AD (2005-26-10) bit my O-320-E2D in the empennage. Installing four new jugs opens some possibilities: flow balancing and 8.5:1 compression.
I'll probably bump to higher compression. No more $ than 7:1 and there are STCs for it in a 172M (pay no attention to the spam can behind the green curtain). The front bearing was modified last overhaul to accommodate higher compression. Any hidden issues other than the usual associated with more horsepower?
The definite maybe is whether or not to port, polish, and flow balance the cylinders. The engine is carbed, but does have a Power Flow Systems exhaust installed with salubrious effect. It might induce greater benefits than usual from the cylinder procedure, optimistically speaking. I'd spring for it if the prospects were good for ~5 or more horsepower and smoother operation. Is it worth upwards of $1000 for this service, or does it rank in there with chrome valve covers as a power enhancement?
John Siebold
ECi's Classic Cast AD (2005-26-10) bit my O-320-E2D in the empennage. Installing four new jugs opens some possibilities: flow balancing and 8.5:1 compression.
I'll probably bump to higher compression. No more $ than 7:1 and there are STCs for it in a 172M (pay no attention to the spam can behind the green curtain). The front bearing was modified last overhaul to accommodate higher compression. Any hidden issues other than the usual associated with more horsepower?
The definite maybe is whether or not to port, polish, and flow balance the cylinders. The engine is carbed, but does have a Power Flow Systems exhaust installed with salubrious effect. It might induce greater benefits than usual from the cylinder procedure, optimistically speaking. I'd spring for it if the prospects were good for ~5 or more horsepower and smoother operation. Is it worth upwards of $1000 for this service, or does it rank in there with chrome valve covers as a power enhancement?
John Siebold