Very interesting. I seem to recall that the 0-200 actually only produced around 80hp. So even if it was 100hp to increase that 140% in only 200 cubic inches seems pretty impressive. My comments are all curiosity. I'm currently making significant changes to my GPAS 2180 that will leave very little of it GPAS. Mostly just to correct my displeasure with the heads, being a single spark plug ignition, a Zenith carb that I have never liked and doesn't have a realistic ability to adjust the mixture, the exhaust and so on. Yes, you can ding me for putting too much effort and money into an already stroked and bored 1600 to 2180. But, I am curious what compression you set your 0-200 up for and if you will have to deal with higher operating temps ?
I recently built a BBC 454 of 255 hp into a 496 of 600 hp and it makes me think of the challenges of doing so with a limited rpm air cooled motor. Many of the challenges I faced like increased operating temperatures, ignition challenges, correct spark plugs, AF ratios..carburation, necessary exhaust tuning ? changes, pump gas and so on are far easier solved in a street engine with so many available aftermarket parts and far easier testing. By the way, I also did this based on a nearly identical rpm range as an aircraft engine. 1,500 to 3,700 rpm. Agin, understand my thoughts are not based on doubts or criticism, I am simply laying out my thoughts on what I think are your challenges and I am anxious to see what challenges you may have that are similar and how you overcame them. I could possibly learn from yours and how they may apply toward my KR2 engine rebuild / redo.
As an FYI in my 2180. What started out as checking my 2180 and pulling the heads because I had one cylinder compression that was not bad but lower than the other three, turned into what I thought was going to be a rebuild when I discovered the cracks between the spark plug hole and exhaust port ( as I recall, may have been intake) and I decided even thought the shop said they could fix them, I decided to give Joe a call as Revmaster and one thing lead to another.... and another and another.
Good luck on this and I hope you read this with the appreciation of my constructive curiosity. I want to read more about your journey.
Jeff York
KR2
Georgetown Scott County Airport
no longer in Lexington, now living on my horse farm in Estill County Kentucky
