RE: looking for a 3w inline 80
ZDZ did make an 80cc inline twin a few years ago also. I bought 3 of them and currently have 1 flying in a big 109 and am putting the other 2 in big 51s. I mention this if you may want to expand your search to include ZDZ. At Bomber Field a couple weeks ago I watched a buddy from Denver fly his Z-P40 with a 3W80 and it ran great. We have about 20 flights on the ZDZ powered 109 and it runs very well. I also saw a guy there with a really big P51 powered with an inline 3W100 or 150 who burned up the rear cyl. on the first flight.....Lenny