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242LS prop results and suggestions needed.

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242LS prop results and suggestions needed.

Old 05-23-2020, 04:37 PM
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Default 242LS prop results and suggestions needed.

Just put a 350 MagMPI in my 1986 242. Running a alpha one 1.5 gr. I can spin it up to about 4,300 @43mph with a SS 3-blade 19” pitch.

i was going to try my 21” pitch Mirage plus but figured if I couldn’t spin the 19” past 4,300 it would be useless.

any suggestions on what I could try to get the RPM up a little. Boat runs fine otherwise, gets on plane fine. Just looking for suggestions. Maybe someone tried something that worked good.
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Old 05-25-2020, 06:43 AM
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Try stepping down to a 17. The max rpm on that engine is 4800 correct?
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Old 05-25-2020, 06:59 AM
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Originally Posted by Redneckcustoms13 View Post
Try stepping down to a 17. The max rpm on that engine is 4800 correct?
4800-5000 I believe.
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Old 05-25-2020, 12:48 PM
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I believe 17 will work for you.
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Old 05-25-2020, 09:07 PM
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I’ll try to hunt down a 17. Are the mirage plus props ok? Like I said I have a 21. Great looking prop but don’t think it will work for me.
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Old 05-26-2020, 06:37 AM
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I personally do not care for them. Some do, some dont. A bravo or revolution will perform better on a 242 in my experience. I dont believe they go down that small though.
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Old 05-26-2020, 08:31 PM
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Originally Posted by Redneckcustoms13 View Post
I personally do not care for them. Some do, some dont. A bravo or revolution will perform better on a 242 in my experience. I dont believe they go down that small though.

any suggestions in a 17 pitch?
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Old 05-27-2020, 07:32 AM
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Are you sure the engine is healthy, compression and leak-down testing, etc?
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Old 05-27-2020, 09:35 AM
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He said it was new in his other posts. Remember it is a small block 350 mag so it should be 300hp or so. Thats less than the 454 that came in the boat, also the sb vs bb torque issue here.

Last edited by Redneckcustoms13; 05-27-2020 at 09:37 AM.
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Old 05-27-2020, 09:57 AM
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.030 over sb. Everything is new. I know it's not a BB and don't expect it to act like one. (Or identify as one) I guess just seeing if someone had anything close or prop suggestions.
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