Doing okay, been a real tough year though. How about you brutha???

I'm not sure of your setup, but 775 hp is possible. The problem is that you have to be spinning that poor little blower for all it's worth. I won't usually do a 2.3 on anything over 509-516 ci. We just recently did a 509 with a side mount 2.3. It was a built engine, alum. heads, etc. and made over 800 hp with the 2.3. The problem was that I had to spin the blower 300% overdrive. At 5500 rpm crank speed, that's 16,500 of blower speed. It barely made 5 psi of boost. We were already past the efficiency of the blower, so I didn't dare spin it any harder. A 3.3 on the same engine would have made over 900 hp.

Even if you were only making 750 hp, you would need one hell of a healthy NA 540 to make that power. However, you will never match the torque. As for longevity, the NA engine will not live as long as a tame sc engine at that power level. You will be severly disappointed if you remove the sc, if the current engine is making anywhere near that power. You already have an sc engine, why get rid of it. I would look into a little larger blower. I'm not saying that just for additional power, but it will be able to make the same power easier than the smaller blower. Let me know if I can help answer any questions.
Eddie

Whipple 509 E.F.I. is the way to go for sure. You will not be disappointed period. Great fuel economy and nice power with lots of torque and a low PSI setting. My builder built me a great package with zero problems and 750+ hp on a very light tune.

I 100% completely agree with Eddie.

People assume because its ''naturally aspirated" its gonna last longer. In order to make lets say 750HP out of a 540, it will hardly be a long lifed mild mannered engine. Its gonna take a lot of compression, a lot of camshaft, and a lot of RPM to do it.

Now, with a blower, to make 750HP out of a 540ci, you can use the right blower, low boost, mild hydraulic camshaft, and easily make that power, and at a reasonable RPM level. It can be extremely user friendly around the docks, and no wake zones.

Also, the beauty of going with a larger compressor like Eddie says, you always have the option to take that low boost 750HP setup, and crank out some more power with a pulley swap if desired.

Are you having a heavy flow day? Have a cranberry juice and start loosening those pulleys champ. That's a 90mph paint job on your boat, not a 80mph one. :party-smiley-004:

Lmao! Now I got a paint job to live up to!?

Go blown or go home!!!!!! :signs069: HAPPY BOATING.

The motor I built is 540 CI, roller cam 9.5 to 1, 4 lbs boost on 93 octane EFI motor. Makes 800 HP at 5500 and close to 900 ft lbs at 3200. The torque is killer and man can you feel it :)

Pretty identical to mine except fuel delivery.


http://33outlaw.zenfolio.com/img/s2/...40782808-2.jpg


540ci Bow-Tie blocks, Dart heads w/ marine valves, BDS 871 blowers – only running 3 ½ lbs of boost, Nickerson 980 carbs,


EDIT: I`m at 8.4:1

I See Dead People
 

Very nice and real close to what i have in mind .