Re: MerCruiser vs Volvo comparison
The motor's are basically the same some small variations but the same. The drive's are much different and the Volvo drive is by far a better drive than the merc gen2. A merc drive (alpha) is good for 300 hp and the Volvo is good for 400 then there's the clutch..no comparison
With that said both work very well and are very good system's when taken care of.
It's really an apples/oranges comparison.
New Volvo replacement drives cost about 2x what a new Alpha costs. New Bravo drives compare a little more closely. AND if you compare an SEI drive there's no comparison to either Merc(Alpha) or Volvo!
Volvo Penta Outdrives
Alpha One, Mercruiser sterndrives and sterndrive information
For the most part, similar boats with either drive are approx the same cost to buy (new).
The possibly higher cost or difficulty finding parts for fixing a Volvo powered boat comes when you start scrounging parts from after-market or "used" sources such as eBay, craigslist, boat-trader etc....... (assuming you're avoiding the seemingly "gold-plated" new parts)
There's simply a larger supply of used and after market parts out there (in the US) for Mercruiser than for Volvo.
OTOH, if they never break, there'd be no problem!
btw, The original "Volvos" were essentially designed at Kiekhaefer (Mercury) Corporation and the SX's were essentially designed by OMC (jointly with Volvo as the saying goes) but Charlie Strang CEO of OMC (and originally from Kiekhaefer Corporation) was on top of all that!
All roads point back to Kiekhaefer as it were!
Stern Drive The Invention of the Stern Drive