572 DFI Procharger Build
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572 DFI Procharger Build
This is my personal boat. I wanted something tech, and fast. My goal is 115 mph... The boat a 2005, 29 Kryptonite.
I finally made up my mind, on the major components for my Kryptonite motor build. I was struggling between a smaller CI motor and some RPM's and a Large motor and not so many RPM's the issue was in which size prop I could use. I didn't want to go to 1.25 gears and didn't want to swing a monster prop on a single engine smaller boat. I wanted the boat to have more of an influence of where we were going than the prop..
So I decided to settle in the middle and order a Merlin III tall deck. It will be a 572ci with a 4.375 stroke and 4.560 bore. I will set it up to spin between 6000-6200. That gives me a few hundred RPM's of safety margin.
Some of the things I have firmly decided on 572, AFR 357 heads, M-5 Procharger, Accel DFI. I am ordering the Block and heads Monday or Tuesday. Procharger is having a good sale starting Dec 15th so I am waiting for then to order the blower. Once the motor is built I am going to have Performance Marine (Saris Racing) set it up on the Dyno, and fine tune the DFI on the water after that.
I finally made up my mind, on the major components for my Kryptonite motor build. I was struggling between a smaller CI motor and some RPM's and a Large motor and not so many RPM's the issue was in which size prop I could use. I didn't want to go to 1.25 gears and didn't want to swing a monster prop on a single engine smaller boat. I wanted the boat to have more of an influence of where we were going than the prop..
So I decided to settle in the middle and order a Merlin III tall deck. It will be a 572ci with a 4.375 stroke and 4.560 bore. I will set it up to spin between 6000-6200. That gives me a few hundred RPM's of safety margin.
Some of the things I have firmly decided on 572, AFR 357 heads, M-5 Procharger, Accel DFI. I am ordering the Block and heads Monday or Tuesday. Procharger is having a good sale starting Dec 15th so I am waiting for then to order the blower. Once the motor is built I am going to have Performance Marine (Saris Racing) set it up on the Dyno, and fine tune the DFI on the water after that.
Last edited by SpeedGirl; 12-13-2009 at 03:50 PM. Reason: snip
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Do you have any parts yet? I have a brand new 572 rotating assembly 4.5 bore and 4.5 stroke MerlinIII. project got put on hold I'd make you a good deal on. It was built by Andy Costello here locally same guy who does GLH's engines for the DBI boat. http://www.offshoreonly.com/forums/g...rking-mti.html
Last edited by Sunshadow; 12-13-2009 at 09:44 AM.
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Maybe some more Tq with the longer stroke but less RPM's. I want to turn a little smaller prop, so I need the RPM's. to make my goal. And I really dont need any more torque. Remember its a 29', that really is a 27' with a platform. With the motor it is about 4,000#.
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Do you have any parts yet? I have a brand new 572 rotating assembly 4.5 bore and 4.5 stroke MerlinIII. project got put on hold I'd make you a good deal on. It was built by Andy Costello here locally same guy who does GLH's engines for the DBI boat. http://www.offshoreonly.com/forums/g...rking-mti.html
It is important for me to build the motor myself. but thanks for the offer.
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All Procharged, the 548 and 583 were lazy compared to the 598 and 615. I run the 598 @ 7500 when I go to the shootouts.
Best of luck to you.
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4.5 Stroke @ 7500 RPM's? That puts the piston speed @ 5625 fpm.That's a little to fast for me, I want to make it to the end of the lake. Maybe I am too conservative but in my business I cant afford to be breaking down, it would not look good..Maybe if I had a drag boat and was going to be at max RPM's for just a few seconds maybe, but for extended periods of time that is just way to fast. I feel a safe piston speed number is 4500 fpm (that's just me). NASCAR engines @ 10,000 have a piston speed of 5417 fpm, and F1 spinning @ 20,000 have a piston speed of 5219 fpm. So you need to be putting some pretty hi tech custom parts in that 598 with the 4.5 stroke to run 7500 RPM's. I cant even imagine what a motor like that would cost to hold up at those speeds for very long. Maybe I am wrong I never tried it outside of a drag motor in a car that was being pulled down every few runs. Could you actually hold it over even 7000 for long? Maybe some other engine builders could chime in here. I am interested to know what others feel a safe piston speed is....
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What Procharger did you use, and how much boost were you using on pump gas? I am going to set mine up on the dyno, but just wondering. Did you dyno any of the motors?