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fuel injection vs. carbureted

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Old 02-14-2003, 09:55 AM
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KN
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Question fuel injection vs. carbureted

I notice a lot of the high horsepower engines are still carbureded. I have a bunch of questions concerning both, here goes.

On a 500-600 HP engine which would you rather have?
Is the EFI going to be more fuel efficient because of better
fuel managment ?
Is the EFI going to run better in general?
Which one will have less maintenance?
Mercury doesn't offer a carb engine ( accept for the 900 ? ) but a
lot of high end builder still do?
Any other pros and cons of each?


Thanks Kirk
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Old 02-14-2003, 10:02 AM
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EFI does all the thing you listed above better. Cost is a big factor, $1500 for good carb and intake vs. $3500+ for EFI.
If you are not going to make future engine mods then EFI is the way to go. If you want to make any mods carbs are cheaper and easier.
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Old 02-14-2003, 11:36 AM
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I prefer a carb over the injection , I've got a Dominator on my 540 and it starts when I want it to and idles a 700rpms in gear with a pretty good sized solid roller.
I think I'm partial to the carb just because i'm not real knowledable on the EFI stuff. Plus all you need to work on a carb is some screwdrivers and basic tools not a laptop and a degree in rocket science !
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Old 02-15-2003, 09:31 AM
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A CARBURATOR IS SUCH A DINOUSOR WHEN IT COMES TO FUEL DITRIBUTION IN ANY ENGINE THE REASON PEOPLE STILL USE THEM IS CAUSE THATS ALL THEY KNOW ITS THE OLD DOG NO NEW TRICKS PROBLEM IV HAD EFI ON MY 540S AND IT WAS AWSOME AND EVEN IF YOU MODIFY THE MOTORS ITS EASER THAN CHANGING JETS AND NO FUEL SMELL ON YOUR HANDS YES IT IS EXSPENSIVE BUT YOU DO MAKE UP FOR IT IN FUEL ECONOMY I HAVE A GUY THATS REAL GOOD WITH IT IF YOU WANT MORE INFO CALL ME AT MY SHOP 734 422 0320 JIM SYYKE
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Old 02-15-2003, 10:34 AM
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Injection gives far more precise fuel delivery and is consistent cylinder to cylinder. Is also more susceptible to an individual injector stopping up and burning a piston (I know of several of those situations - mostly cruisers though since a go-fast will announce a miss thru the louder exhaust and its hard not to notice).

EFI programming thru a laptop is different but much handier than yanking bowls off all the time.

A carb, properly setup, will perform great but "properly" set up is sometimes EXPENSIVE.

EFI is nice. If you got it be happy. If you don't, you're still fine.
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Old 02-15-2003, 11:07 AM
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EFI all the way.

Even Harley's have EFI, and you know how slow to change they can be.
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Old 02-15-2003, 11:29 AM
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personaly i will never run a carb again. EFI's are actually pretty easy to work on once you develop an understanding for the components in the system. course than again i do have a degree in rocket science. i remember when GM came out with the long runner tuned port and i thought it was the end of street rodding . . . little did i know . . . than i put one in my 71 camaro . i have not taken a wrench to it since i first set the base parameters like 15K miles ago. i havent switched the boat over yet but was thinking about a pair of GM RamJet 350 crate motors. they put out about 350 HP an 400lbs of torque. anybody delt with them yet?


these engines
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Old 02-15-2003, 04:32 PM
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The problem with injection motors in the salt is electrical and salt does not mix. I like my carb motors. If I have a alternator failure then I can go a LONG LONG way before my ignition system is going to kill the battery. We had a alternator go on a cig in Biscane bay and the EFI engines on it killed the battery.

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Old 02-16-2003, 01:39 AM
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good point Jon . . never thought of that one . . still . . . . .i like my feulies . . . .your fairing project looks kickass . . saw it in tech. think i may hafta find me a supplier for that stuff for mine to.
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Old 02-16-2003, 08:28 AM
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Dave thanks man

I got the NIDA Core from Composits One. You can check them out on the web. I think it is www.composits1.com

Jon
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