725hp GenIV

[TexasTonka]

I'm sure it has been kicked around or years but tell me something... If my GenIV motor that makes 600hp from the factory can be slapped in a boat and make 725hp/649tq (http://www.ilmor.com/en/marine/perfo.../MV10-725.aspx)
Why can't I have the 725/649 marine motor in my ACR?
Marine motors are designed to go full throttle hammer down constantly so it must be reliable power. What gives?

[Mamba003]

If you go full Bolt-on's including headers, exhaust, ported intake or genV intake, and tune you will easily make 600 rwhp or over which is close to 725 at the crank, assuming at 15% drive train loss. In fact there are a bunch of genIVs running around with 615 plus to the wheels.

[01sapphirebob]

Emission standards are different for cars vs boats im sure.

[IndyRon]

Remember the boat motors are set up for mid-high RPM power only. There is no need for a good torque curve from idle to 3500rpm. Most of these motors will need 3500rpm+ to plane depending on what boat they are in. Because of this, it's not uncommon for the boat motors to have 2"+ primaries on the headers and as mentioned above, minimal to no emissions and accessories.

[ViperSmith]

Epa

[Redx]

A motor used in marine has much much better water cooling, and are roughly 33% more efficient for that reason.

[slowhatch]

If you go full Bolt-on's including headers, exhaust, ported intake or genV intake, and tune you will easily make 600 rwhp or over which is close to 725 at the crank, assuming at 15% drive train loss. In fact there are a bunch of genIVs running around with 615 plus to the wheels.

Easily. There are guys on here that make 615-620whp with full bolt on gen 4s. That would equate to at least 700hp crank, plus that is on a Mopar PCM, not a custom tune like whats available now with the HPtuners. Very interested in seeing what a full bolt on car with the HPtuners treatment is capable of. I'm thinking we will be seeing 630-640whp full bolt on gen 4s in the near future. Frogmstr, where are the numbers?!

[RPM9000]

Easily. There are guys on here that make 615-620whp with full bolt on gen 4s. That would equate to at least 700hp crank, plus that is on a Mopar PCM, not a custom tune like whats available now with the HPtuners. Very interested in seeing what a full bolt on car with the HPtuners treatment is capable of. I'm thinking we will be seeing 630-640whp full bolt on gen 4s in the near future. Frogmstr, where are the numbers?!

Im interested in seeing what kind of numbers he comes up with too.

[Venom]

Would love to see the numbers too? ... more boat info...the horsepower is more important not only to the hull design but the pitch of the propeller. ... less pitch on the propeller... less horsepower it takes to get gong and you can be ' ALL IN' ]very quickly and have less top speed. Kinda like a cars gears... My thoughts being a avid boater at one time is ....gas engines for fresh water boating and diesel for ocean boating. Most boaters that would run a 32 foot boat an larger would not run a gas engine...to many parts to break down.
Weekenders with small boats... gas engines were always less expensive to purchase than a diesel. They were always being worked on after they got 900 hours on them.. Even though companies went to fresh water cooling and some heavier components don't think they would offer a lot more reliability for the difference in cost. Sucking in Salt air near the coast was not healthy for any engine. Not a mechanic so can't really say which components in an engine modified would make it more reliable? Interesting thought though? I always thought that the less moving parts in a motor the more reliability was achieved? But not sure that is right any more either...maybe its the oil? and keeping the lubricated?

[VoodooRob]

Here's the link for the Ilmor 725. http://www.ilmor.com/en/marine/performance/MV10725.aspx. Marine engine manufacturers have to meet emissions standards now too. One of the reasons why Merc racing introduced the 565 and 520 was to fill the void left by the 525 EFI because of emission requirements. I do not know if Ilmor rates HP from the crank or prop shaft, maybe someone will chime in. Merc Racing did a few at the prop shaft then changed to crankshaft. Both manufactures use closed cooling instead of raw water.

[345s-bspinnin]

I recall seeing a Gen III Ilmor engine on a ram truck. In case you missed it:

http://www.vtcoa.com/forums/f7/ilmor...-engine-33726/

009.jpg

[Venom]

WOW!!! that is some engine !!! thanks for posting the link!