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22-03-2010, 10:46 PM
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#1
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Registered User
Join Date: Feb 2010
Posts: 101
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petrol vs diesel
just a question lets say i removed my cummins merc diesel 300 @3900 and wanted to replace it with a petrol engine what petrol engine would i need to go for for simlar performance
cheers shaun
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22-03-2010, 11:32 PM
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#2
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Registered User
Country: Job Centre
Location: In a box
Occupation: Chaos's gofer
Interests: Skiving
Boat make: Spectre 30
Engines: 2 x Promax 225
Cruising area: In the bath
Join Date: Mar 2004
Location: In a box
Posts: 5,201
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In one of my 26's, a 315hp Yanmar gives very similar performance to a 6.2 Mercruiser.
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Chaos for Moderator. 
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23-03-2010, 12:32 AM
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#3
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Registered User
Join Date: Feb 2010
Posts: 101
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hi tony
what hp is the 6.2
and what sort of speeds are you getting with the yanmar are you using a bravo diesel or an xr
thanks for your reply
cheers shaun
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23-03-2010, 12:46 AM
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#4
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The Doc
Join Date: Mar 2004
Posts: 8,291
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325
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23-03-2010, 12:48 AM
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#5
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The Doc
Join Date: Mar 2004
Posts: 8,291
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23-03-2010, 12:49 AM
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#6
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Registered User
Join Date: Feb 2010
Posts: 101
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cheers 
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23-03-2010, 01:15 AM
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#7
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Registered User
Country: Job Centre
Location: In a box
Occupation: Chaos's gofer
Interests: Skiving
Boat make: Spectre 30
Engines: 2 x Promax 225
Cruising area: In the bath
Join Date: Mar 2004
Location: In a box
Posts: 5,201
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the first 26 with a yanmar ran 62 mph with a std bravo 1. it suffered a drive failure coz the customer wound up the idle to remove the gear chatter....
Later ones have had 1X's, without any failures.
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Chaos for Moderator.
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23-03-2010, 01:42 AM
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#8
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Registered User
Join Date: Feb 2010
Posts: 101
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if i were to use a bravo 3 on a cmd what ratio would be best
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23-03-2010, 08:26 AM
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#9
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Registered User
Country: Job Centre
Location: In a box
Occupation: Chaos's gofer
Interests: Skiving
Boat make: Spectre 30
Engines: 2 x Promax 225
Cruising area: In the bath
Join Date: Mar 2004
Location: In a box
Posts: 5,201
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1.36:1 on my boats, but what boat have you got?
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Chaos for Moderator.
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23-03-2010, 11:41 PM
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#10
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Registered User
Join Date: Feb 2010
Posts: 101
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its a 27ft scarab built from kevlar the complete weight with cmd and drive will be around 1.7 ton
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23-03-2010, 11:42 PM
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#11
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Registered User
Country: Job Centre
Location: In a box
Occupation: Chaos's gofer
Interests: Skiving
Boat make: Spectre 30
Engines: 2 x Promax 225
Cruising area: In the bath
Join Date: Mar 2004
Location: In a box
Posts: 5,201
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That's around the same weight as my 26's, although I'd imagine we're a bit narrower!
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Chaos for Moderator.
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24-03-2010, 12:19 AM
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#12
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Registered User
Join Date: Feb 2010
Posts: 101
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im not sure the waterline width but at the widest point she is 7ft 9" i will measure the waterline width tomorrow
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24-03-2010, 11:01 PM
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#13
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Registered User
Country: UK
Location: South Coast
Interests: Boats/Cranes
Boat make: Revenger 29 RIB
Engines: Illmor V10/625hp.
Join Date: Oct 2005
Location: South Coast
Posts: 247
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Do it properly and get an Ilmor ! you wont be disappointed 
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