I posted in Q & A but no responce, so here it is

I notice that the 570 and 650 have V V T cam and all the rest don't , the 725 say's it has Billet Steel Solid Cam " why " ?
and what one is better for endurance ? " longevity " reliability "

Thank's
mike

172 views TTT

Mike,
All I can tell you is that my 2009 Gev IV viper V-10 8.4 lt, 512 Ci engine has VVT cam, and it's 600HP/560 Lbs of ft. torque, stock. I also know that some of the guys who track vipers change out the VVT for a solid cam...
Hope that helps.
Dean

Variable valve timing is great for streetability and emissions control, I dont see where it would add much in a marine motor apart from a better idle unless emissions are a factor.

VVTI will be the downfall of all manufactures reliable engine packages in the auto industry. I have been in it for over 20 years and VVTI systems fail all the time. I have 1st hand knowledge of Toyota, Lexus and Ford.

Short answer- marinize the viper engine to Ilmor specs, 650hp. Step 2, Build for more HP with more revs, 725
Both configs run very well and are 3-star emission certified.

Any experience with GM or Dodge? (Or Honda?)

The honda variable valve timing and lift stuff has been really reliable. Now ford stuff???

Honda VVT has been around forever and is very reliable.

I would have to agree with that, the platforms themselves are pretty bullet proof these days and good for many many miles. Stands to reason marketing needs to have engineering get a higher failure rate back in somewhere . . . . .