Ford 6.8L V10
I've been seeing alot of Ford V10s coming into the shop with bad main and/ or rod bearings. The 4.6 and 5.4 motors seem just about indestructable but this v10 is just not cutting it. Since the v10 is just like the v8 with 2 more cylinders I'm confused. I have two hypothysis: 1) The longer crankshaft is developing a harmonic frequency at certain rpms and it's damaging the bearings. 2) This engine is "under engineered" for its application and it is coming apart due to excessive wear/abuse. I see this engine in alot of F/E 350-550 trucks so it may just not be suitable for these heavier applications.
What are your thoughts? Any references dealing the cause or conditions of this probem would be greatly appreciated.