Jake, this is an interesting subject. For some reason, I have always understood that on 4 cylinder engines, when displacement exceeds 2.5L the vibrational characteristics of the engine increases dramatically due to the inability of 4 cylinder engines to cope with 2nd or is that 3rd order harmonics, reducing overall engine life. Especially b/c 4 cylinders are prone to vibration compared to I-6, V-8 etc... Is this just a fallacy or is there some truth to this.
Originally posted by Jake
There's a lot of work to do but yes, eventually I'd like to have a 2.6 hanging off the engine stand. :D
I'll be in a position financially to resume putting this project together in about a month or two but my current location in the UK isn't all that set in stone for the next year. I'm trying to get an assignment to Korea so I'm holding off until I know for sure where I'm going to be. Most likely I'll just pack everything up, put it in storage for a year while I go away to Korea and then return and resume the project. Not like I've ever really been in a big hurry anyway. :p
This 2.6 will be just as maintenance free as any mild 2.5. With all concerns taken into account, there is no reason something larger than 2.5 has to be a highly strung and temperamental race motor.
As far as necessary additional costs, the crank is the biggest one. Some use custom rods for their 2.5's anyway so I don't really count that as an additional cost. All 2.5's will obviously require new pistons so I don't count them either. Other than this though, everything else will be standard high spec 2.5 stuff. Unusual maybe, but far from extreme in my opinion.
What makes an engine "maintenance needy"? The simple answer is RPM. An engine designed to spin exceptional RPM will need a few things that definitely impact service life on there own. High lift, long duration cams is one of them. Using a modest redline with a respective cam choice will probably make the biggest difference in terms of service life. This is a basic rule that applies to all engines irrespective of their displacement.
90 Sterling 2.5L E30///M3 lifer
03 Audi RS6 daily
88 E28///M5 project