What Cubic Inch 572, 622?
 

It's time to build the engine for my Superboat. I plan on going all natural big cubes 700 - 800hp single carb. 572ci minumum. Should I go bigger like 600+ or not? I'm looking for pros and cons for the attitude of idle and reliability ect...

Re: What Cubic Inch 572, 622?
 

well I don't know much about them, but I believe a 572 can be made with bore equal to stroke which at least sounds the most efficient from an engineering prospective... I believe it's 4.5"bore and 4.5"stroke.. but Id like to have 700+ inches also :D geez wouldn't 8" be enough

Ernie

Re: What Cubic Inch 572, 622?
 

A 572ci is a square motor but it is a 4.5" bore and stroke.
I have had very good luck with 598 cu combo 4.6 bore and 4.5 stroke. There is no replacement for displacement. This larger bore is suppose to help unshroud the valves a little besides the cubic inches. This has become a very popular combo.
You should be able to make 750-800 hp very easily with some decent heads. we made 740hp with plane heads and Hyd roller cams 6 yrs ago and the heads have improved alot since then.

Re: What Cubic Inch 572, 622?
 

Sounds good. No issues with large CI and good idle for Bravo style drives? Much diiference in low end torque compared to a 509 blower motor?

Re: What Cubic Inch 572, 622?
 

I had a 588 inch tall deck in my 26' AO. It ran one "monster" carb, roller cam, with all the goodies inside. It made 735HP. built by Bob Wallace of Offshore Performance in Southern NJ,

Re: What Cubic Inch 572, 622?
 

Did you like it? Run it again?

Re: What Cubic Inch 572, 622?
 

check out the pricing at www.marineassault.net I don't know much about them, just seen their ads around they build a 705" motor

Ernie

Re: What Cubic Inch 572, 622?
 

With Warranty :eek: :eek: :eek: cool tripps

Re: What Cubic Inch 572, 622?
 

Re: What Cubic Inch 572, 622?
 

Thanks, I already have a builder ect. Just want to get more opinions and advice from users first hand.

Re: What Cubic Inch 572, 622?
 

All that aside, if you are going to put this kind of power on a "Bravo style" drive, well, you already know the answer to that one.

Robert[/B][/COLOR][/FONT][/QUOTE]

I have been successful before. Alot has to do with the driver.

Re: What Cubic Inch 572, 622?
 

I have been successful before. Alot has to do with the driver.[/QUOTE]
amen!!!!!!!!!!!!!!!!

Re: What Cubic Inch 572, 622?
 

I run a solid roller 598 in my cat and have no regrets. I run a single Nickerson stage 5 1250 Dominator, which flows close to 1500 CFM. One suggestion would be to run headers, preferrably some with longer primary runners. Manifolds or CMI E-Top headers will probably cost you 50+ HP on a large inch NA motor compared to longer runners. Good luck!

Craig

Re: What Cubic Inch 572, 622?
 

Thanks Craig, I plan on using Lightning stainless headers. Maybe dry tube, not sure yet.

Re: What Cubic Inch 572, 622?
 

Most of the aftermarket blocks have a 4.625 max bore, So you still have25/1000s left. I ran these with a 34' V and bravos with no problems at all. It was a great package for me, ran great, never died, easy to start. I would definately do it again. As stated earlier this is a very popular combo, ours was Paul PFaff, it is also run by TMP, Cobra, Dereberry,just to name a few.

Re: What Cubic Inch 572, 622?
 

598s!!!

Re: What Cubic Inch 572, 622?
 

Add JC to my list, Like I said very popular.There must be some reason everyone likes this.

Re: What Cubic Inch 572, 622?
 

More stroke than bore normally aspirated especially with chevy style heads tend to not run as good as a 598 or 588 combo.

Re: What Cubic Inch 572, 622?
 

Re: What Cubic Inch 572, 622?
 

True about the Bravos.They dont like big stroke motors[more torque breaks them]

Re: What Cubic Inch 572, 622?
 

True fact JC, they don't. I guess I should feel lucky with my blown 454 700hp. I got 250hrs on a 97 Bravo and 100+ on my XR and still going strong. 26' cat around 3800#'s I'll put the 05 XR to the test.
So 598ci is the hot ticket? Probably costs almost the same as a 572? Best heads? Dart Pro1?

Re: What Cubic Inch 572, 622?
 

Go with 598 s ~~~~
800+ hp and great around the docks


Rick OSG

Re: What Cubic Inch 572, 622?
 

Hmmmmm....Interesting thread!!! :cool: :cool: :drink:

Re: What Cubic Inch 572, 622?
 

Pro 1 darts.AFR 357s,Brodix.They all make within 5 to10 horsepower of each other.Dart or Brodix manifolds seem to be the best.572 or 598 is the same price to build.

Re: What Cubic Inch 572, 622?
 

Either. Need 4 3/4" crank for the 600+" stuff. Prices have really come down on that stuff since I built a 632" 5yrs ago. (4.75 X 4.60") It made 900HP @6400 @820 ft/# @5000. Dart 360 heads, dart tunnel ram 2X775 demon carbs and BIG SOLID ROLLER. A 622 makes a lot of sense, it'll save a lot of cylinder wall. Should make 800HP all day with single dominator and a hydralic roller from "the bottom of the page" :D :rolleyes: If you go with solid roller PM me and I'll give you a combo that will work. :drink:

Re: What Cubic Inch 572, 622?
 

Excuse my ignorance, but I think this is the right place to ask.
What kind of reliability are these engines going to offer, assuming they are normally aspirated? For a guy who knows next to nothing about engines and has had outboards all his life is it better to stick to stock Merc power? Is stock Merc power more expensive? Let's say we are talking about anything from 400-750 HP. This question includes the drive, in fact, it includes the entire package. If I'm looking for this kind of HP and want to be able to go out every weekend without tinkering all the time, with some basic maintenance what's the best thing to do?

Re: What Cubic Inch 572, 622?
 

On my 598 I am at 10:1 compression with Dart 355 CNC Pro 1's and a match ported Dart single plane intake. Cam is a solid roller 264/270 duration @.050" on a 114 LSA installed on a 112. Lift is .740. Never dynoed motor. It makes decent power and idles well.

Re: What Cubic Inch 572, 622?
 

I'm curious about how many hours people get on these also, but it won't hold me back either way. I will go with a hydrolic roller cam for sure and single manifold, I think.
RTAYLOR, yes thier less expensive than Mercs motors. You'll also have a bigger pkg to start with. ProCharge a 598ci and you'll easily have 1100+ hp at low boost.

Re: What Cubic Inch 572, 622?
 

I plan on changing springs and lifters every 50 or so hrs. You won't have that maintenance using a hydraulic roller. As for the bottom end I will probably tear down and inspect at 200 hrs. For me that will be 4 - 5 seasons.

Re: What Cubic Inch 572, 622?
 

There is a 29 Warlock in MD with something like 700 N/A cubes. The damn thing idles at 9mph. While some us can nicely glide into the dock, he REALLY has to be careful, and usually has to reverse to stop.

Re: What Cubic Inch 572, 622?
 

I thought that Warlock was blown.

Re: What Cubic Inch 572, 622?
 

FD, it may be. Its been three years since I have seen it. I don't remember a blower surge though.

Re: What Cubic Inch 572, 622?
 

My choice would be Innovation Marine. Doller Offshore in Hollywood Fl. has a 700hp,598ci. fresh water cooled,fuel injected engine on display with a one year warranty Built by Innovation Marine. I have their 800hp motors in my boat.

Re: What Cubic Inch 572, 622?
 

Yes, mine will be fresh water cooled also but carburated.

Re: What Cubic Inch 572, 622?
 

I have a 600 ci merlin with low compression and a dominator making low 700's and idles like a stock 454! never had a complaint. (just some input) :D

Re: What Cubic Inch 572, 622?
 

That's what I like to hear! :D

Re: What Cubic Inch 572, 622?
 

Why do you want a carb? The latest fuel injection is pretty easy to work with.

Re: What Cubic Inch 572, 622?
 

Carbs still make more power!!.... :p :rolleyes: :D When I see fuel injection on pro stock motors I'll change my thinking :drink:

Re: What Cubic Inch 572, 622?
 

Pic....sold it to a guy in Texas putting it in a Magnum sport :eek: :D Talk about surprising a few people... :p

Re: What Cubic Inch 572, 622?
 

I agree about a carb making more peak power assuming it is sized accordingly. Three circuit dominators are very tuner friendly these days. The benefits of EFI are numerous, but bang for your buck and maximum HP a carb is still tough to beat.