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05-19-2019, 12:07 AM
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#1
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Lt. JG
Join Date: Jun 2018
Posts: 37
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2000 SCR 2400 w/ 5.0L - carb upgrades
Has anyone went from the 2 BBL to a 4 bbl carb and performer intake? Any advantages?
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05-19-2019, 12:46 AM
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#2
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Captain
Join Date: Oct 2011
Location: Chesapeake, VA
Posts: 556
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Let us know if you try this, I'd be interested in hearing how it worked for you. I have tried similar with car engines and got no increase in HP. The limitation is that your intake runners, bore/stroke, and exhaust ports are still the same size.
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05-19-2019, 03:18 AM
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#3
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Admiral
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 10,623
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Mercruiser rated the 2bbl 5.0 at 220HP and the MPI at 260HP, a 4bbl should produce about the same HP as the MPI just not over the same power band.
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1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
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05-19-2019, 02:13 PM
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#4
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Lt. JG
Join Date: Jun 2018
Posts: 37
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Is this true? If so, I'd do an intake and carb in a second
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05-19-2019, 02:41 PM
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#5
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Admiral
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 10,623
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Quote:
Originally Posted by kaczman
Is this true? If so, I'd do an intake and carb in a second
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Worst case you should get at least 20 HP increase.
__________________
1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
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05-19-2019, 02:44 PM
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#6
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Lt. JG
Join Date: Jun 2018
Posts: 37
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I 'd be happy with 20. Has anyone ever done this before, and if so whats required? I assume edlebrock 1410 750 CFM 4 bbl carb and 2516 4 bbl manifold?
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05-19-2019, 02:47 PM
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#7
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Admiral
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 10,623
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Quote:
Originally Posted by kaczman
I 'd be happy with 20. Has anyone ever done this before, and if so whats required? I assume edlebrock 1410 750 CFM 4 bbl carb and 2516 4 bbl manifold?
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That’s too much carb for a small block, get a 1409 600 cfm. But yes changing the intake are carb is all that is required. There is other option like changing the cam and heads but at that point I would just get a 5.7.
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1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
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06-13-2019, 06:25 PM
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#8
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Lt. JG
Join Date: Jun 2018
Posts: 37
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Has anyone did it in a SCR 2400? Seems like clearance would be an issue.
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06-13-2019, 10:51 PM
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#9
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Admiral
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 10,623
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Quote:
Originally Posted by kaczman
Has anyone did it in a SCR 2400? Seems like clearance would be an issue.
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My 2400 SCR came with a 5.7LX (260 HP 4 bbl) in 2016 I repowered with a 5.7 Vortec with a new 4 bbl intake and my old carb with no problems.
__________________
1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
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06-14-2019, 02:37 PM
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#10
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Lt. JG
Join Date: Jun 2018
Posts: 37
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Quote:
Originally Posted by mmwjr
My 2400 SCR came with a 5.7LX (260 HP 4 bbl) in 2016 I repowered with a 5.7 Vortec with a new 4 bbl intake and my old carb with no problems.
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I assume you repowered with the same 260hp engine that originally was in it?
What is your max and cruising speed?
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06-14-2019, 08:03 PM
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#11
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Admiral
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 10,623
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Quote:
Originally Posted by kaczman
I assume you repowered with the same 260hp engine that originally was in it?
What is your max and cruising speed?
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No the Vortec is a MPI long block rated at 320 HP, with my setup I suspect I’m at 300 HP. On flat water I can hit ~39 mph at ~ 4200 rpm just shy of hitting WOT. I just don’t push it that hard. I do have a Bravo 2 drive.
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1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
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06-26-2019, 05:49 PM
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#12
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Lt. JG
Join Date: Jun 2018
Posts: 37
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Thats awesome. I will be repowering this boat with a 320hp 5.7L.
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06-26-2019, 05:50 PM
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#13
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Lt. JG
Join Date: Jun 2018
Posts: 37
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Quote:
Originally Posted by mmwjr
My 2400 SCR came with a 5.7LX (260 HP 4 bbl) in 2016 I repowered with a 5.7 Vortec with a new 4 bbl intake and my old carb with no problems.
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Can I ask how hard the swap was, or any tips or pointers?
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06-26-2019, 07:27 PM
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#14
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Captain
Join Date: Jun 2016
Location: Mn.
Posts: 664
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Quote:
Originally Posted by kaczman
Thats awesome. I will be repowering this boat with a 320hp 5.7L.
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What drive do you have? If it is an alpha1 gen2 you are limited to a max 300hp as the drive will not handle any more.
Don
__________________
1995 Maxum 2400 SCR 5.7 A1 G2 LUNA DE MIEL SOLD
1988 Bayliner 2455 5.0 IO (sold)
1987 Seaswerl 18ft C. Cabin 4.3 IO(lost in fire)
2012 South Bay Pontoon
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06-26-2019, 07:36 PM
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#15
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Lt. JG
Join Date: Jun 2018
Posts: 37
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I have a new alpha 1 gen 2. Yes, its rated for max 300 but as long as you arent hole shotting it I'll be fine.
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06-26-2019, 09:33 PM
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#16
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Captain
Join Date: Jun 2016
Location: Mn.
Posts: 664
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Good luck
__________________
1995 Maxum 2400 SCR 5.7 A1 G2 LUNA DE MIEL SOLD
1988 Bayliner 2455 5.0 IO (sold)
1987 Seaswerl 18ft C. Cabin 4.3 IO(lost in fire)
2012 South Bay Pontoon
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06-27-2019, 01:00 AM
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#17
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Admiral
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 10,623
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Quote:
Originally Posted by kaczman
Can I ask how hard the swap was, or any tips or pointers?
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Other than adding a oil pressure switch to power the added electric fuel pump (no provision for a manual pump) the rest is a direct drop in.
I also added closed cooling.
__________________
1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
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06-27-2019, 01:03 AM
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#18
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Admiral
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 10,623
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Quote:
Originally Posted by kaczman
I have a new alpha 1 gen 2. Yes, its rated for max 300 but as long as you arent hole shotting it I'll be fine.
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Hope it’s a Mercruiser drive and not an SEI as I haven’t heard the best reviews for them. Mercruiser did offer the A1G2 behind a 454 and the service life was mixed depending on how the boats were operated.
__________________
1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
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06-27-2019, 02:10 PM
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#19
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Moderator
Join Date: Apr 2008
Posts: 5,690
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Quote:
Originally Posted by kaczman
I have a new alpha 1 gen 2. Yes, its rated for max 300 but as long as you arent hole shotting it I'll be fine.
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I had a friend who overpowered his Alpha significantly. Zero - WOT throttle holeshots are not a good idea. At higher speeds in rougher weather, he needed to keep his hand on the throttles. The second the boat and drives come out of the water, you need to chop the throttle, then hit them very very quickly when you hit the water again. Similar to what the offshore racers do.
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06-27-2019, 04:57 PM
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#20
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Admiral
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 10,623
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We’re talking 20 HP over a limited part of the power band, doubt throttle jockeying will be required.
__________________
__________________
1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
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