It's my understanding that the new 725 makes more than 725hp & the Indy drive has a real transmission, dry sump tranny at that so the hp loss to the prop is far less than a #6. I don't know what kind of power an NXT robs but I'm almost positive it has a cone clutch tranny which isn't anywhere near as strong as the tranny in front of a #6 or Indy drive.

Indy= 4HP parasitic loss
#6= 38HP parasitic loss

http://www.powerboatmag.com/ilmor-fl...ew-muscle.html

another article says it takes 24HP to turn vs double that for NXT:

http://www.bigbadboat.com/2009/02/il...premieres.html

MM,

Nice find, much better than my "almost positive" remarks!

Viper is no longer for sale. The new Chrysler has decided to keep it and make it a profitable division of their company.

Indy drive=breakage!

Meaning What and Why?

Really?

Love to hear how you came to that conclusion.

Uncle Dave

Well, the obvious take from that is that the drive broke. shhhhhhh.:eek:

That is absolutely incorrect. The first set of drives that were shipped to us did have a slight issue. The engineers from Ilmor immediately found the problem, switched vendors, and rectified the situation. Since that point the drives have performed flawlessly. We put some time on the boat this past week, and the customer put some time on the boat this weekend, and all is well. The issue that we had with the first set of drives was related to a nut being manufactured out of tolorance. Ilmor immediately switched vendors and replaced the nut in question. There was no drive failure that was reletive to durability and or design. Bear in mind that this was the first set of Drives to be sold to the public. Compared to some of the "Growing Pains" other manufacturers have experienced, this was by far a minor issue. The impressive part was the level of attention that the problem recieved, and the manner in which it was dealt with.

Thank Animal- noted.

Seems relatively minor compared to skeg design issues causing handling problems on early NXT's.



UD