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New to me 1991 272 SR1

Old 08-05-2020, 06:20 AM
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Ran it for a bit yesterday. Does anyone know what the 454 mag is rated for WOT? Iíve read conflicting info online. I spun the 25 Mirage to about 4200 yesterday and that was 64mph. Light chop two adults and a full tank of fuel. Wondering how that would compare to mirage plus 23 at around 4800?



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Old 08-05-2020, 06:55 AM
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One of my all time favorite designs!

Gorgeous.

Congrats and enjoy!

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Old 08-05-2020, 06:18 PM
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Originally Posted by pputkowski View Post
Ran it for a bit yesterday. Does anyone know what the 454 mag is rated for WOT? Iíve read conflicting info online. I spun the 25 Mirage to about 4200 yesterday and that was 64mph. Light chop two adults and a full tank of fuel. Wondering how that would compare to mirage plus 23 at around 4800?


25ís are what they came out of the factory with atleast thatís what mine came from with from factory. Granted mine is a 89 I would still think they would be the same. And I would only think that 23s would have a higher rpm but lower mph.
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Old 08-05-2020, 06:28 PM
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Something is off here, you should be getting some more RPMs out of the Mags. Usually 4800-5000 depending on conditions and props. Bone stock, I would think 4800 RPM should be the target.
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Old 08-05-2020, 08:53 PM
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My 25 mirage on a twin 330 272 gets me 4600 maybe 47 with a super lite load at 67. I thought about trying to get 5000 out of it but they have 900 hours on stock motors with good compression and super low oil consumption so I donít want to push my luck ha.
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Old 08-06-2020, 05:25 AM
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Originally Posted by distantthunder View Post
Something is off here, you should be getting some more RPMs out of the Mags. Usually 4800-5000 depending on conditions and props. Bone stock, I would think 4800 RPM should be the target.
I need to see what it will do with less fuel. I was running at 4200-4300 with 125 gallons...
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Old 08-06-2020, 07:24 AM
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Can't help with the question but where are you? We need to get the twins together.


Last edited by F14A water jet; 08-06-2020 at 01:37 PM.
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Old 08-06-2020, 09:23 AM
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Originally Posted by pputkowski View Post
After a few years without my 223LS I got the bug again and started looking. Found this 91 in AL about two months ago and have been bringing it back to life. Lots of deferred maintenance but nothing crazy. Last bit Iím working on is a complete lack of panel lights?

Anyways the hour meter reads 600 and I think thatís accurate. Always freshwater. Right now it spins to 4200 with 25 Mirages... wondering if new ignition components will help that. Someone also converted it to electric fuel pumps and the whole setup seems anemic... will probably swap your Holley reds or blues during the off season. I donít think many of these were built with magnums? Coming from the 223 with a single 454/330 this boat is very dependent and sensitive to tab input. Still learning but having fun. Also I forgot just how silent the ST platform was!










what ratio outdrives?
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Old 08-06-2020, 10:32 AM
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Originally Posted by oconnor marine View Post
what ratio outdrives?
Not sure they are Bravo 1ís with 454 Magnum decals.
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Old 08-06-2020, 10:32 AM
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Originally Posted by F14A water jet View Post
Can't help with the question but where are you? We need to get the twins together.
Lake Norman NC!
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