2001 C-12 -- what HP?

[Richard Cooper]

My 2001 Beaver Marquis 40JSP ---- has the C-12 engine.  Is it 425 HP or 455?  Or what?

BCS insists it's 425 HP, but the 2001 brochure I have a copy of says it's 455 HP.

[David T. Richelderfer]

My 2004 Marquis with a C-12 is rated at 505 hp and gets 5 to 6 mpg.  My brother's 2000 Marquis with a C-12 is rated at 425 hp and gets 7 to 9 mpg.  Another friend has a 1998 or 1999 (I forget which year) Patriot Thunder with a C-12 rated at 425 hp.  I have seen other early 2000 Beavers rated at 455 hp.  It appears the hp rating increased between the late 1990s and mid 2000s.  I doubt its hp rating is a big selling point.  The fact it has a C-12 is a big selling point.  As you well know, and as prospective buyers should be informed, it has plenty of power.  And if my experience has anything to offer, then the 425 hp rating probably gets better mpg.  But, also, my Marquis is heavier than my brother's Marquis.

[Jeremy Parrett]

Richard,
My 2000 C12 is 455hp.  Engine production date is 1999.   Marquis Amethyst.  Hope this helps,  Jeremy

[Gerald Farris]

Richard,
Most of the 2001 Marquis coaches came with the 455 HP program installed in the ECM (engine control module). However, the only way to determine if your coach has a 455 HP or a 425 HP program is to connect a scan tool up to the Cat ECM. The only difference between the 425 HP C 12 and the 455 HP version is the program that is loaded into the ECM. Other than the ECM program, the two engines are identical, and the HP rating can be easily changed from one to the other by your local Cat dealer. However, the 505 HP C 12 has some mechanical differences to the earlier version.

Gerald