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06-25-2004, 11:52 AM
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Engine pic looks like a carb, but dealer description says "310 Hp Vortec Motor". Sounds injected. Is it a TBI? I can't imagine someone buying an '02 bu with a carb. http://adcache.boattraderonline.com/6/6/6/72203366.htm
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Join Date: May 2004
06-25-2004, 12:07 PM
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holley 550 to 650 carb
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06-25-2004, 12:08 PM
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pamoya, that is a dual inlet holly. I would guess a 750CFM carb with an electric choke (black circle on the side). I have not seen a FI unit that has the exact same body as a carb, so i would say that is a carb. not fi
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06-25-2004, 12:51 PM
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I recognized the electric choke from my 4.3 carb, but wasn't totally sure. What hp would this motor be with FI? What a waste.
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Join Date: Aug 2003
06-25-2004, 1:18 PM
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310 HP, and not a waste. 10 years ago, motors at 265 hp were stroking. You may spend a little more time getting her started, but not a waste IMHO. Daniel
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Join Date: Aug 2003
06-25-2004, 1:22 PM
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btw, that is a nice looking boat.
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Join Date: Sep 2002
06-25-2004, 1:42 PM
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Looks like a Holly double pumper (two float bowls). It is a good carb. Rod
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06-26-2004, 5:00 AM
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Not injected, 310hp is indmar (for malibu's) base carburated 5.7l engine. Fuel Injected version brings it to a minumum of 325hp (depending on year could be 325,335 or 340hp).
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07-06-2004, 12:10 PM
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I love this boat, but at the top of my absolute must-have list for my next boat is fuel injection. I am a perfectionist when it comes to engine performance and can't understand why someone would want a fuel delivery system that is manually adjusted (carb) when a computer can adjust it to absolute perfection and efficiency every time.
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Join Date: Feb 2002
07-07-2004, 1:58 PM
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given the choice, i would be very reluctant to buy anything with a carb ever again. that's not to say that a good carb can't be tuned well and work perfectly fine. i just suck at tuning carbs. that said, boat EFI currently cannot operate in closed-loop mode like automotive EFI. this is because oxygen sensors do not work in a wet exhaust, so the computer has no feedback mechanism to tell it if the engine is rich or lean, so it cannot correct on the fly. boat EFI fuel & spark curves are a "best guess" for assumed typical operating conditions. (intake air temp, elevation, humidity, etc) on that note... i don't know, but i would assume that boats sold in higher elevations would have to have a different fuel curve than those in areas closer to sea level? thus, if one buys a boat from out of state, they should get it reflashed? (Message edited by trace on July 07, 2004)
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Join Date: Jan 2003
07-07-2004, 2:30 PM
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If they use mass airflow sensors, altitude differences should't matter. I'd assume that they probably do. If, however, there are EFI systems out there that use the older vane-type airflow meters, altitude will definitely make a difference. Most likely, the boats would be calibrated at sea level and run rich at altitude. I'd think that manufacturers would have compensated for this. Maybe they have a sensor? My old BMW has a barometric pressure sensor that is meant to lean out the mixture at altitudes above, I think, 5000-6000 ft. The problem is that if the sensor goes bad at sea level, the motor goes BOOM! Needless to say, I have disconnected that sensor here in Austin.
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Join Date: Feb 2002
07-07-2004, 4:57 PM
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my 96 Monsoon uses a MAP sensor, no MAF. here's a great article on cars, not sure how much applies to boat EFI. http://www.thirdgen.org/newdesign/tech/enginecontrols.shtml
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07-08-2004, 6:51 AM
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Waknup, that is correct, but the Indmar TBI engine also puts out 310 HP, because in essence it is the same engine as that sunsetter with an "electric carb"
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Join Date: Jun 2004
07-08-2004, 8:10 AM
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Palmova, I don't think Malibu does anything different to the engine than Skier's Choice (Moomba & Supra). They use the same Indmar engines. For them, the carbureted Vortec is 310HP and the same engine with EFI is listed as 320HP.
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07-09-2004, 8:44 AM
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I'm not as concerned with the HP. I think anything over 300 is plenty for my uses. It's just that when I upgrade, fuel injection (of some sort) is what I am most looking forward to. I don't think I would be so against the carb if I could get my carb'ed Four Winns running as perfectly as I would like. I really like that boat though...
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