Genuine Lycoming next time ...
My RV7A has been flying for just under 12 months. In that time I have discovered that ECI Titan cylinders run hotter than Superior or Lycoming which can be an issue with RV's. In the last few years we have seen Superior go broke and re-appear. ECI has had numerous recalls on cylinders.
When you buy an engine from a shop that just assembles engine parts there will often be two parties to deal with in the event that you need your warranty - the builder and the manufacturer of the parts.
IMO - one thing you really need to consider when purchasing an engine is the company's ability to make good on a warranty claim. If it is just one failed engine pretty much all of them will put you right. However, what if they have 100 engines with faulty cylinders or crankshafts and the manufacturer won't or can't replace them?
Many of these engine shops have excellent reputations and they do great work. For many people that is enough, but I?d suggest none of them would survive a situation like I describe above. Before Superior went broke many of us would not have even considered the chances of this happening, Today you would have to give it a second thought.
Many people make a big deal out of ECI?s anti-rust cylinder technology. How much benefit that is I don?t know. Traditionally the camshaft has been the area of concern on these engines but now everyone has roller cams, so camshaft and lifter issues should be greatly reduced. I do know I have to replace all four cylinders in my engine before 350 hours thanks to ECI, and my hanger mate currently has four cylinders that must be retired at 2000 hours. So for me, the promise of a better engine has not been realised in ECI.
Knowing what I know now, if I did things over again I would buy the genuine Lycoming Experimental from Vans. If you have a need for your warranty there is only ?one throat to choke?. Lycoming engines have been largely free of the issues that have plagued the other suppliers for the last 3-5 years and to me they seem like they are here to stay as a company. Also, Van's engines fit with their FF kit. If you want to get in the air quickly and cheaply this is the way to go.
I'd reject any engine unless it has a warranty that begins at first flight. Unless you have built a few times it will take you longer than you think to finish the airframe and you don't want an engine without warranty for your first flight.
Cheers
Richard