Lucky Aviation
Member
I am considering installing a IO-390 in my RV8, I understand that there are challenges, are there any builders out there that have done this? Have you any advice?
I am considering installing a IO-390 in my RV8, I understand that there are challenges, are there any builders out there that have done this? Have you any advice?
The aforementioned options would save so much build time and anguish in an 8.
Got that out of the way. One annoying thing about forums people, want to argue that they are correct or want their choices validated. I'm not doing that. Also, I'm building something other than an 8.
Why wouldn't you consider a stroked straight valve or a higher compression straight valve engine from one of the custom shops? It just seems so much easier installation for a very small, if any WOT performance hit. Would be a little bit lighter, BTW.
Few will argue that the Lycoming straight valve engines are as close to bullet proof as they get. Yes, I'm aware that some design margin is utilized with said mods but there's enough run history that eases that concern. The aforementioned options would save so much build time and anguish in an 8.
Once again, I'm not saying I'm right but I'm going with a stroked, injected, improved sump, EI, EFI, straight valve engine that will make almost the exact same HP @2700. The better torque curve (an under valued characteristic) should really be evident in cruise settings. The build would seem so much simpler.
I like hearing other's reasoning. I'm curious. Please fire away.
What anguish? A stock 390 installs just like a stock angle valve 360.
I gave myself lots of extra work for custom stuff, but I'm crazy.
I have an Rv8 with the IO390EX up front ... extended cowl ... extended Hartzell hub (2" i believe) ... 190 knts ....
Smoothest 4 cylinder I've sat behind ! ....
If I built a new RV8 project I would not consider any other powerplant ... love it!