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10-05-2007, 02:55 PM
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#1
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Registered User
Country: UK
Join Date: Jun 2006
Posts: 1,237
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Big Block to small block.
How much agro would it be to swap a pair of 454 magnums for a pair of 350 magnums?
Are the drive ratio's the same or different?
Any advice allways appreciated, thanks.
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10-05-2007, 04:58 PM
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#2
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The Doc
Join Date: Mar 2004
Posts: 8,291
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what drives?
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10-05-2007, 05:23 PM
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#3
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Registered User
Join Date: Mar 2004
Posts: 6,891
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It's gonna be bravos.
Drives likely to be 1.5:1 for both.
I think it's a direct bolt in replacement
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10-05-2007, 08:12 PM
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#4
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Senior Member
Country: UK
Location: TYNE & WEAR
Interests: Anything fast
Boat name: Turbinator
Boat make: 50 SUPERHAWK/36 CAT/32 ACTIVE THUNDER
Engines: 3X502 EFI/1600 hp TURBINE/2X700HP MRD
Join Date: May 2004
Location: TYNE & WEAR
Posts: 146
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Why? you will loose a load of torque is the boat light? to pop on plane
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10-05-2007, 08:26 PM
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#5
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Registered User
Country: UK
Join Date: Jun 2006
Posts: 1,237
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Yeah, torque could be a problem.
Just looking at the options to make a boat comply with the Round Britain Class's.
Boat weighs approx' 2700kg's but is too big on engine capacity. Changing to small blocks would save 140kg's in weight. Only other option is to convert to diesel's but that would be very expensive.
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10-05-2007, 09:10 PM
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#6
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Senior Member
Country: UK
Location: TYNE & WEAR
Interests: Anything fast
Boat name: Turbinator
Boat make: 50 SUPERHAWK/36 CAT/32 ACTIVE THUNDER
Engines: 3X502 EFI/1600 hp TURBINE/2X700HP MRD
Join Date: May 2004
Location: TYNE & WEAR
Posts: 146
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I went the other way with a 22' boat 350-450mag its is very straight forward, the only thing to check out is the bolt pattern on the output shaft donut as this differs as generations of engines changed.
The bellhousing and engine mounts should be a straight swap
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11-05-2007, 01:33 AM
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#7
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Large member
Country: England
Location: On the farm
Occupation: General Trouble Causer Salterns Boatyard
Interests: Official smartass
Boat name: Seahorse.org
Boat make: a V24 and a SLOW unstable ICE Bladerunner
Engines: 2x300 promax, 320 Volvo
Cruising area: England/France & Med
Join Date: May 2005
Location: On the farm
Posts: 2,681
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Why has Cap'n chaos have JF as his Avatar?
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11-05-2007, 01:53 AM
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#8
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Registered User
Country: UK
Join Date: Jun 2006
Posts: 1,237
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Cos JF is Chaos's Hero, I guess.
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11-05-2007, 02:05 AM
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#9
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The Doc
Join Date: Mar 2004
Posts: 8,291
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thats right Mr Turnip1, he most certainly is................i dream about him at night, cant concentrate at work & have even been known to call out his name when reaching a point of extacy whilst shaggin the mrs!
OR
I could just be avin a laugh
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