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What Cubic Inch 572, 622?

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Old 04-20-2005, 12:38 PM
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Default Re: What Cubic Inch 572, 622?

Quote:
Originally Posted by NJSONIC
Why do you want a carb? The latest fuel injection is pretty easy to work with.
First, you can add a blower by yourself. No computor to recalibrate.
Second, if something happens to the fuel system I can most likely fix it in an hour and not take the boat to someones shop for two weeks.
Third, I'll put more money in my bank.
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Old 04-20-2005, 12:41 PM
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Default Re: What Cubic Inch 572, 622?

Quote:
Originally Posted by jdnca1
Pic....sold it to a guy in Texas putting it in a Magnum sport Talk about surprising a few people...
That's a motor! Thanks.
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Old 04-20-2005, 09:06 PM
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Default Re: What Cubic Inch 572, 622?

Who sells a high performance closed cooling system for my engine?
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Old 04-20-2005, 10:03 PM
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Default Re: What Cubic Inch 572, 622?

I was under the impression you could use a closed cooling system for a diesel engine... i think they have alot more capacity than the ones merc is using on there closed systems in the racing dept... I agree with you the engine packages i have been looking at look great with the efi setups.. but on twins i can save about 10k with carbs... i can deal with that...

Don
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Old 04-20-2005, 10:19 PM
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Default Re: What Cubic Inch 572, 622?

I understand that carbs can make more power. But a Pro stock engine isn't the same as a marine engine.They have to be tuned differently. The torque ranges are different if i'm correct. You would want your peak torque around 4700-5300 rpm in a boat,that is being used for pleasure. A drag boat which is totally different operating conditions. The engine for the Magnum Sport is great looking. The intake looks similar to mine. Heres a pic.
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Old 04-20-2005, 10:24 PM
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Default Re: What Cubic Inch 572, 622?

Fasterdamit,
I agree using carbs with blowers that are added later is much easier.The fuel injectors on my engines are GM injectors. If I need an injector I just go to get one they are not something special.
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Old 04-21-2005, 12:27 AM
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Default Re: What Cubic Inch 572, 622?

OK,I will tell you this, FROM experience, on a naturaly aspirated 572, you don't need more than one carburator in a pleasure boat application, PERIOD. The engine doesn't draw enough cfm to justify the second carb and you will KILL your throttle response. When I was tuning the engines on the 47, we took the tunnel rams off and put on a Merlin intake and a single carb and only lost 3 horsepower on the dyno, but the throttle response was now unbelieveable. Peak torque in a boat engine should be close to where the owner wants to cruise, typically around 3500 rpms.

Robert
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Old 04-21-2005, 01:22 AM
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Default Re: What Cubic Inch 572, 622?

My plans are as you described. Single carb set up. Lookin towards a 598ci.
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Old 04-21-2005, 08:26 AM
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Default Re: What Cubic Inch 572, 622?

Tonto,

What RPM is your peak HP made on the 572? I run my 598" at 6500 RPM WOT and think dual quads may give me some gains up there. I cruise at 4000 - 5000.

Craig
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Old 04-21-2005, 11:35 AM
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Default Re: What Cubic Inch 572, 622?

Why not go with a Donovan aluminum block(or similar) 752ish cubes, and, closed cooling? Then, just change the cylinder sleeves at rebuild time. The additional upfront costs could be mitigated by later savings in machine work, shipping, etc.

Also, the aluminum engine blocks would save a few pounds, and are often repairable by welding.
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