How much HP are my 540s?
 

Recently picked up this boat that has some nice 540s in it. Previous owner never dynoed them but figured they were pushing around 750hp each.

Here are the specs:
The engine blocks are GM Siamese tall decks, 540 CID, Callies cranks, Carrillo rods, JE pistons, Crane Hydraulic roller cams, Jesel cam belt assemblies, Dart heads, Brodix intakes, Electromotive Fuel Injection and Ignition, Vortec V4 Race blowers with intercoolers.

Machine work before assembly (all parts were new):

Internals were fully balanced and blue printed. Cranks polished, Decks surfaced, mains were align honed

Crane Cam part #: 139741 , grind # HR-296-2s-12 IG
Intake @cam 359 @valve 610
Exhaust @ cam 372 @valve 632

http://i1225.photobucket.com/albums/...psedeca94f.jpg

Which Dart heads, stock or ported, how much boost, what compression ?

Thats one of the problems: I dont know too many of those details. Lower boost, maybe 5lbs although Im sure a pully change would make a big difference.

What size injectors, how much fuel pressure? they could be 700 hp to 1100 hp depending on head work and boost, Smitty

Small Intercoolers? Exhaust Manifolds look restrictive? Any thoughts from those who know?

Coolers look like M4

+1

They look like pro chargers to me, not vortec


Rambo,

What kind of speeds are you seeing? What props and drives? Those numbers will give a good indication of what kin of HP you are making

There just pro charger intercoolers, can't tell on my phone but look like vortec blowers.
They are Gil manifolds with some custom risers. I think he has Ssm III drives with some pretty good size props.

Like it was said, too many variables, but sure sounds like a nice parts list. Callies cranks, carrillo rods, Dart heads, jesel, tall deck blocks, etc etc. I can see those engines with a roots 10-71 making 900+ with maybe 7-8lbs of boost.

Don't know jack about Vortech blowers, but sure looks like they are overdriven just a little! 750HP should be easy on low boost mode with that setup.

Mild there is a gear train in that cover that steps the ratio. I forget what the available ratios were.

Yeah the blowers are Vortec, the intercoolers are from Procharger. They are gil manifolds with custom tail pipes.

Forgot about rest of drivetrain:
-Huber 1330 Trannys
-SSM 3 turning 31p 4 blades
-Supposedly does 90 MPH on GPS...but havent had a chance to try it WOT throttle yet.
-Its a 36ft boat, same bottom hull as Baja Outlaw (the boat is a Force 10)

http://i1225.photobucket.com/albums/...t/IMG_0073.jpg

http://i1225.photobucket.com/albums/...t/IMG_0078.jpg

I think with that notched transom you could say it has the same bottom as the 35 outlaw, the 36 did not have a notch. :D lol

Great looking ride btw

I think with that notched transom you could say it has the same bottom as the 35 outlaw, the 36 did not have a notch. :D lol

Great looking ride btw

It's not notched, the previous owner built a big extension box onto the back of the boat. Almost like he moved the transom back.

I see that now... good catch..

If it really does 90 they have to be 825-850+ HP.

I dont see a Force/Baja 36 running 90 with anything less.

Consider Doc Holidays boat...

I couldn't see that on my phone last night, good catch. Wow that looks like a ton of work! I guess that explains the crazy exhaust routing!

I have an unfair advantage, rich emailed me pics and info before he went to buy it lol

LOL Yep, Jamie had some insight!

The guy did some crazy work on this thing. The 'extension box' is actually made out of aluminum and the transmissions are inside it. There is an access panel in the swim platform (aluminum) to get to the trannies. So in the engine compartment, the motors are in the same position as if they were in a Bravo set up.
That's the reason for the exhaust routing too...seems to work well in any case.

So yes, a 36' boat then an extension box added.

http://i1225.photobucket.com/albums/...t/CIMG4654.jpg

http://i1225.photobucket.com/albums/...t/CIMG4655.jpg

http://i1225.photobucket.com/albums/...t/CIMG4819.jpg

Dude, that is a cool ride.

Hope to see you in Abay this year

They are overdriven even more than you think, the internal gear box steps them UP even higher, not sure what ratio Vortech uses but on my Baja I am running Procharger M-3s, the lower crank pulley is about 7.750, the blower pulley is 3.70 and the internal gear box is 4.44-1 UP,the blower on mine turns just about 10 times faster than the motor, at 6000 rpm's the blower is turning 56000 when I do the rough math, Smitty

I second that, someone put ALOT of work into that old girl!!!!

Smitty

I asume that your are about maxed out with that unit? I would love to see that boat in action!!!!!

I'm actually turning it PAST its rated rpm although I was mistaken on the internal gearing which is 4.10-1 not 4.44-1, looking at the ati website I see they changed the rating of the m-3sc to 50,000 rpm's, it used to show 48,000 from what I remember. I turn my motor as high as 6200 and with the new cam I pput in this summer when I freshened it once I get it tuned perfect again I may turn motor as high as 6400, Smitty
I exploded a head unit once a few years ago too so they are NOT indestructable but seem to hold up decent even wicked up!

Ok, so I still dont know the answer, but bit of an update:
-Turning 17 3/4 31P 4 blade props

Took her out on the weekend and GPS'd 80 MPH at 4300 RPM with 13 ppl on board and a FULL (600 litres) tank of fuel! Still had a lot more throttle and more trim too! :)