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2001 EFI 260 Mercs---- Thinking of procharging. Pros and Cons requested??

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2001 EFI 260 Mercs---- Thinking of procharging. Pros and Cons requested??

Old 08-18-2015, 11:18 AM
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Default 2001 EFI 260 Mercs---- Thinking of procharging. Pros and Cons requested??

I have and 01 Sea Ray 280 Sun Sport with twin 5.7 260 EFI motors with Bravo Drives. Motors are stock at this time. Qustions I have:

1. What kind of longevity will I get out of the motors once boosted? They have 200 HRS on them now.
2. Should I just leave them alone and build fresh motors that are built for boost?
3. Should I go with a set of strong 383 motors and forget the boost? (seen some 425-475 HP motors) Not boosted....

The boat had optional 496 (425HP) mags when new so I know the boat can handle it and achieves close to 62-65 MPH with them factory. Currently I have had a top speed of 54 MPH. Pretty good for what it is. 9'6 wide 28 foot boat. I believe it weighs around 8000lbs.

Thanks in advance for any knowledge.

Mike
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Old 08-18-2015, 01:40 PM
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Boost is great but I don't think your 260s were built for it. Motor wise, it all depends on how fast you want to go, blown or N/A, how much money do you want to spend. Good running motors will need a good fuel system, probably some kind of headers, at some speed external steering. And when it's running really good you may start breaking drives.
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Old 08-18-2015, 01:56 PM
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I'm very into small blocks, but in cases like this, I would say big blocks are your answer. 8.1 take outs maybe..too.
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Old 08-18-2015, 01:59 PM
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I would be very happy with mid 60s. It's not a go fast but would like a little more.
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Old 08-18-2015, 02:00 PM
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With them already EFI motors could I not just put a better fuel pump in the tank?
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Old 08-18-2015, 02:19 PM
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From what your describing I agree with SB and say go the 496 HO take out route. You could have the boat as fast as you wanted it in a short amount of time and best of all it would be stock and an easier sell when comes time.
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Old 08-18-2015, 02:30 PM
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Thanks for the ideas guys, I have learned to ask a lot of question before digging into these little projects.
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Old 08-18-2015, 02:32 PM
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Originally Posted by konst406
With them already EFI motors could I not just put a better fuel pump in the tank?
They are not like cars. The Merc/Volvo marine engines have the pumps external of the tank and rigged to the motor.
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Old 08-18-2015, 02:35 PM
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Did not know that. This is my first fuel injected boat and I have not really messed around with anything yet.
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Old 08-18-2015, 02:41 PM
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The long-blocks between the 5.7L (250 HP), 5.7L EFI (260 HP), and 350 MAG MPI were identical. Since the ECM has to be re-flashed anyway, I wonder if these could be made to work?

http://whipplesuperchargers.com/inde...product_id=143
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