Carburated VS Fuel Injection |
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Orlando76
Grand Poobah Joined: May-21-2013 Location: Mount Dora, FL Status: Offline Points: 3108 |
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Please support The Cystic Fibrosis Foundation
1976 Ski Nautique 351 Escort 1993 Ski Nautique purple and black 351 HO PCM |
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Andy, In all honesty, If this is a problem with your carb'd boat or any others starting, please read Eddies (backfoot) post. It's the fifth into the thread. I feel a carb rebuild and tuning is needed. You're giving the carb'd engine a bad reputation! If the "fiddling" you mention is to get the engine to crank, then cable adjustment is needed to close the NSS (neutral safety switch) in neutral. Both carb'd and FI'd engines have NSS's. |
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GlassSeeker
Grand Poobah Joined: November-26-2008 Location: Elk Grove, CA. Status: Offline Points: 2421 |
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Carbs every once in while, some more than others, need you to put the control in nuetral and open the throttle wide open or pump it or some such fiddling to start the boat...fuel injection you just turn the key to start.
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This is the life
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TRBenj
Grand Poobah Joined: June-29-2005 Location: NWCT Status: Offline Points: 21141 |
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No fuel injection until '94. Multiport EFI debuted in '95.
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Captain Nick
Senior Member Joined: December-01-2013 Location: Batavia, IL Status: Offline Points: 129 |
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I'm looking more towards a 90 to 93 Ski Nautique. What were the engines like in those? Are parts for the engine easy to find? Again I have to wait for my boat to get sold. Also need a tow vehicle and boat lift as well.
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Live life to the fullest!
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john b
Grand Poobah Joined: July-06-2011 Location: lake Sweeny Status: Offline Points: 3238 |
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EFI/DI always performs better given everything else is the same. It seems many attempt to return to a golden age of muscle cars that was never a reality as far as performance is concerned.
1970 HEMI 'CUDA ENGINE / 425 HORSEPOWER 426 HEMI 2x4 BARREL AS TESTED / 4 SPEED TRANSMISSION AND 3.54 REAR PERFORMANCE / 13.10 @ 107 DRAG TEST PUBLISHED / CAR CRAFT 11/69 2015 Mustang Engine: 5.0 liter/ 3.7 liter/ 2.3 liter Horsepower: 435/ 300/ 300 Torque: 400 lb-ft. 0-60 mph: 4.5 seconds 1/4 mile: 12.9 seconds @ 112 mph EPA: 15 mpg city/ 25 mpg highway Energy Impact: 17.3 barrels of oil/yr CO2 Emissions: 7.8 tons/yr There are other factors that influence the result here, the biggest being tires, but it still stands that the 2015 Mustang (standard, not a Shelby) beats the 426 hemi Cuda. The Hellcat is only good at melting tires without upgrades. Here |
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1970 Mustang "Theseus' paradox"
If everyone else is doing it, you're too late! |
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Gary S
Grand Poobah Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096 |
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Pete I use my cell for everything. Turned off my land line when I left, uverse distance limitations were 3K feet,up north we are 5K. Down here since we are only here for 5 months didn't want to pay for the other 7. If we get low we just buy extra data for the cells.
As to FI I'm not advocating to take a carb engine and convert it or to buy a FI engine and put a carb on it. But I am not afraid of change and FI is here to stay. |
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halfnelly
Senior Member Joined: January-14-2013 Location: Maitland, FL Status: Offline Points: 253 |
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I would respectfully disagree. The horsepower ratings are more accurate today than the old days. For example, the new 5.0 Mustangs you mention regularly put down 380+hp on a chassis dyno, which is easily over 420hp at the crank. Conversely. most performance motors were usually underrated in the old days for insurance reasons. There have been countless engine builds using factory parts to duplicate the original specs that show how grossly underrated they were back then. I'm not surprised a 340 Six Pack Challenger would beat a new 425hp SRT-8. A new Challenger/Charger weighs as much as an F-150, and that "275hp" 340 probably makes somewhere closer to 350hp with a decent tune up. Power to weight ratio advantage goes to the first gen.
How many how many blown, carbureted 426 Hemis do you see that can make 707hp with turn-key reliability, pass an emissions test, idle smoothly, still make decent vacuum, and get 20+ mpg on the highway like a Hellcat? None, because EFI and modern technology make that possible. True, carbs usually make better power numbers in dyno tests, but EFI wins hands-down in enabling efficiency AND power production. It really just comes down to how much you're willing to deal with as far as tuning goes. My boat has a Holley on it and I'm perfectly fine with it here in FL. But for someone who isn't as mechanically inclined, skis in an area that has a wide variation in temperature or altitudes, EFI has an advantage. |
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Gary,
How many years "into the future" did it take you to dump your POTS? Wait, you still have it for the Uverse! (at least the drop!!) |
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Riley
Grand Poobah Joined: January-19-2004 Location: Portland, ME Status: Offline Points: 7952 |
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I bought a new boat in 2003 and opted for the carb engine. I could have had the top of line efi for $1800 upcharge, but actually wouldn't have taken it for free. No regrets, the boat has always run well. And I don't know how to tune a carb like Eddie suggests. I've never understood the hard start argument. What ski boat owner has trouble starting their carb engine? And I always let the boat get up to normal temp before going faster than an idle, so efi compensating for cold running does not matter to me one bit. That said, if I was buying a new boat now, I would accept efi as that is all you can get now due in part to federal clean air regulations.
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backfoot100
Platinum Member Joined: January-03-2007 Location: United States Status: Offline Points: 1897 |
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LOL... More Horsepower??? Really???? HP numbers are so inflated it's not even funny. Not saying that old numbers aren't either but I've driven new high tech 400+HP cars as well as 350+HP classic muscle cars. There is no way that you can convince me that new 420HP Mustang or 375HP Ram is truly the rated HP. Watch vids of a 340 Six-pack Challenger whipping the s**t out of a new 425HP SRT8 not once, but six different times and everyone immediately screams the 340 was modded and the SRT8 driver didn't know what he was doing. How can new technology get toasted so bad???? Economy? Reliability? Warranty? Carbed engines never got 25MPG, ran for decades untouched or were warrantied???? Go to any enthusiasts forum you want, doesn't matter what ones, I'll wait...... Still waiting..... OK, there you go. Look at the predominant discussions about guys wanting to mod their brand new rides to add more HP (I defer to the above HP response that 425HP isn't enough???), cold air intakes, dual exhaust, headers, bigger tires, Blah, Blah, Blah......You get the idea. The one and ONLY thing they're ever concerned about is if it will void their precious warranty. Science has proven that A/F ratios of 16 or 17/1 provide the best economy however it gets dangerously close to being way too lean. On the other end of the spectrum, science has also proven that the most power is generated with A/F ratios in the 12 or 13/1 range. Manufacturers have settled on splitting the difference at 14.7/1. so they don't have these engines coming back on warranty. Contrary to popular opinion, these new EFI engines are still nowhere near perfect. They can be more economical or provide more power but they can't do both. Sounds like a carb doesn't it? C'mon Gary, you're retired now and have lots of time on your hands. Go tune your carb for more power or more economy or even split the difference but please go tune your carb and stop this old school denial stuff. |
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When people run down to the lake to see what's making that noise, you've succeeded.
Eddie |
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63 Skier
Grand Poobah Joined: October-06-2006 Location: Concord, NH Status: Offline Points: 4248 |
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Glad you guys chimed in on efficiency, I meant to comment on it. I am fine with whatever anyone likes, and as I said I like both carbs and efi depending on the application, but I don't buy claims that carbs are as efficient as efi. Like Eddie said above, efi tunes "on the fly" for optimum fuel delivery. With a carb I'm having someone drive while I look at the carb to see what kind of rpm/speed I can run without getting into the secondaries so I know what the efficient speed to run at is. And if you run a 2 bbl carb set up for efficiency, you can't get the power you want. Efi is a great way to maximize power and efficiency.
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'63 American Skier - '98 Sport Nautique
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Nick, The rumbling is all in the exhaust system and not the fuel system. You may have noticed that newer injected boats are quieter but that's because the exhausts have some form of mufflers. |
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JoeinNY
Grand Poobah Joined: October-19-2005 Location: United States Status: Offline Points: 5697 |
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All other things being equal modern computer controlled fuel Injected engines last longer, get better fuel economy, and have better performance between idle and wot. How much longer and how much better depends on a lot of factors, but don’t kid yourself into thinking a carb is better in any way other than cost. That being said they are more than good enough for day to day ski boat use and my daily driver summer vehicle is carbed and also serves me nicely through 3 seasons. But I do appreciate the crap out of my fuel injected commuter in the winter.
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quinner
Grand Poobah Joined: October-12-2005 Location: Unknown Status: Offline Points: 5828 |
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What surprised me the most moving from a carb to EFI in a CC was the increased fuel efficiency. It was a noticeable difference and that was even going to a bigger boat with more HP. Reliability I have experienced with EFI has been very good, put about 500 hrs on a GT-40 and never changed a single component including ignition/tune-up. Have about 600 hrs on the Excal and have only replaced the LP fuel pump. Gone thru 3 caps and 1 set of plugs and a rotor. For a regular workhorse ski machine EFI is tough to beat!!
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john b
Grand Poobah Joined: July-06-2011 Location: lake Sweeny Status: Offline Points: 3238 |
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Made my day aupatking!
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1970 Mustang "Theseus' paradox"
If everyone else is doing it, you're too late! |
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Hussler
Gold Member Joined: February-04-2012 Location: - Status: Offline Points: 897 |
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I lol'd |
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aupatking
Senior Member Joined: October-03-2013 Location: Alabama Status: Offline Points: 139 |
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I don't know carbs. Pretty much it. I'm good with Legos, is my basic description of my mechanic skills. I'm real good at pulling off injectors and putting new ones on.
Rich versus lean? I hope to find a wife that's both. Just don't tell my wife that joke. |
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02 SN 196 TSC2 ZO
01 SN 196 TSC1 98 SN 196 TSC1 97 SN 196 TSC1 93 SN 196 NWZ |
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Captain Nick
Senior Member Joined: December-01-2013 Location: Batavia, IL Status: Offline Points: 129 |
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I myself like them for different reasons. The carbureted have a better rumbling sound then the fuel injection. For instance my next door neighbor's boat is a Mustang 17. That boat sounds like a Scarab. Just an awesome sound to it. The fuel injection is nice because if you happen to use the boat all the time. For instance watersports or long boat rides. The fuel is a bit more of a sipper. What's been mentioned before keep the boat looking as stock as possible.
I think it'll come down to the looks and ride of the boat more so then carb vs fuel injection. Thank you all for your input. |
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Live life to the fullest!
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ScottZ
Platinum Member Joined: January-20-2004 Location: Clanton, AL Status: Offline Points: 1144 |
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I have 3 carb Ski Nautiques, a GT40 Sport Nautique, and an efi outboard. I like them both.......old school and new school. I am not interested in updating old fuel systems to new. I like to keep as close to original as I can. If I do update something it is something that can be easily changed back to original and is not obvious (points to electronic ignition, for example). I do need more education on tuning carbs. Slowly but surely I will get there.
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Scott Zuelzke
Lake Mitchell , AL 1984 Ski Nautique 1972 Skier |
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DayTony
Gold Member Joined: June-30-2013 Location: Salem MA Status: Offline Points: 832 |
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What it all comes down to is personal preference and experience. Same as it goes for cars and trucks. The truth of it all is under the right light, EVERY car, truck or boat is a piece of junk. some are just more glorified than others. They are ALL going to have issues, they are ALL going to give you grief at some point during its life, and they are ALL going to require maintenance.
Someone's always going to know someone else who had a horrible issue and blamed it on EFI and equally, someone else is always going to know another person who had a nightmare of a boat that happened to have a carb and they blamed it solely on that. in a perfect world those two people would never meet and never have this conversation. But this is the internet. And here we are haha. Proceed with can of worms |
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1988 Barefoot nautique-454
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63 Skier
Grand Poobah Joined: October-06-2006 Location: Concord, NH Status: Offline Points: 4248 |
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I'm in the "both" school of thought.
I like the carbs in my old CC and my jet boats. I like the injection in my '98 GT-40. All of them run very well. |
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'63 American Skier - '98 Sport Nautique
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Donald80SN
Grand Poobah Joined: January-12-2009 Location: Denver, NC Status: Offline Points: 3896 |
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You asked when Correct Craft changed over to FI. It was in the early 90's and it was with the throttle Body injection and the Pro-Tec Ignition. With the Pro-Tec, in most cases you were likely better off to have the old carb set up and that is the cure for the old Pro-Tec problems is to go back to a Carb and a DUI ignition. However, new technology can be problematic at the start and things seemed to work out nice after the Pro-Tec and the throttle Body went away for more of a direct injection system.
With the help of TimB. and Joe NY, my carbed 80 ran great, but I do love my 2002, FI GT40 and so does my wife. She just pushes the start button and you are ready to go with a warm engine, to a point. I do fear the day I need to trouble shoot the GT 40, with the dual fuel pumps that can be problematic and all of the relays and sensors and such. You can not just pour a little gas in the carb to eliminate the am I getting fuel part of the trouble shoot with a fuel rail. I just could not pass up the opportunity to own a 2002 Master's pickup boat. JMO, Donald |
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1980 Ski Nautique SOLD Back to Cypress Gardens
2002 Sport Nautique, GT-40, FCT2, Cover Sports, Tower Bimini, Inc., Wet Sounds Audio System, Star Gazer Wake Edition S. 1968 Ski Nautique, Project. |
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john b
Grand Poobah Joined: July-06-2011 Location: lake Sweeny Status: Offline Points: 3238 |
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I have never driven a FI boat. Are there a lot boat owners who replace a carb with FI or vice versa? Unless there is an issue with reliability or performance with a specific make and model I can't imagine why anyone would deviate from the manufacturers design unless you are racing your boat. In that case I can think of better boats than these inboards to accomplish the task. There is not a lot of performance to be gained from an older NA engine by just changing to FI..
We do a lot of tweaking in my car club and it requires FI at that level, but these are forced induction engines that run 24-38 psig boost, were designed with FI, have data logging capability, and produce up to 7hp per cu in. Many have stand alone systems. It is the last thing I would want to power my ski boat. Tim and Joe have shown that there is plenty of performance in the carbed engines and to date I havent seen anything equal to their performance in a ski boat converted to FI. |
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1970 Mustang "Theseus' paradox"
If everyone else is doing it, you're too late! |
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Alan, This one is old, it's a hot rod and a skier so should it be loud or quiet? |
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81nautique
Grand Poobah Joined: September-03-2005 Location: Big Rock, Il Status: Offline Points: 5776 |
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Hot rods loud, ski boats quiet... Old boats carb'd, new boats FI
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Gary S
Grand Poobah Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096 |
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Merely that whenever something new comes along,someone always says it's no good. It was said with the car vs horse, if man were meant to fly, the internet will never catch on,Japanese cars are junk,etc. I have both and both work as intended. If I was buying new and had a choice FI would be the way I'd go. I happen to think PCM has remarkable engines with the horsepower,economy,reliability combined with a warranty that a carbureted engine cannot match.
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Gary, Seriously, what does growing hay have to do with the pros and cons of fuel systems? Are you suggesting that since the carb is old tech that engines should be retrofitted with injection? BTW, how does an internal combustion engine run on hay? |
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GMacLaren
Senior Member Joined: August-22-2013 Location: St. Louis, MO Status: Offline Points: 495 |
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Gary S
Grand Poobah Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096 |
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You guys are too funny, I suppose you all grow your own hay for your everyday drivers
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