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#11475809 - 03/14/16 05:22 AM RPM's for Phoenix
Jigfish Offline
Extreme Angler

Registered: 02/28/03
Posts: 2833
Loc: Tx
I have a 2015 920 Phoenix with 250 Show Yamaha. Going about 65mph I'm getting about 4000 RPM's. Is that right or should I be getting more?
_________________________
Thanks,

Kaufman High School Boat Captain

The weak call it obsession, the strong call it dedication!
Jigfish


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#11475842 - 03/14/16 06:33 AM Re: RPM's for Phoenix [Re: Jigfish]
Flippin-Out Offline
Extreme Angler

Registered: 02/25/15
Posts: 1642
Loc: Magnolia, TX
RPMs don't get associated with any particular boat. For any given boat/motor/prop combination, the proper prop should be selected. The rig should be propped so that the engine runs just at the maximum engine-manufacturer approved RPMs. Generally speaking, if the pitch of a prop is too low for a boat, the engine will over-rev the RPMs and the rev-limiter will kick in. For a prop with pitch too high, the engine will bog down and never achieve the power rating intended by the manufacturer. That power level depends on reaching the max RPM.

I don't know what the max RPM is for your particular engine, but most SHO's state 5000-6000 RPM as the max power range, so you appear to be WAY out of line at 4000 RPM. You are either grossly mis-propped, have an improper engine height, or a mechanical issue. The proper prop on that boat should allow a 250 SHO to run 5000+ RPM.

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#11476898 - 03/14/16 02:42 PM Re: RPM's for Phoenix [Re: Jigfish]
gary purdy Offline
TFF Guru

Registered: 05/24/03
Posts: 10977
Loc: Littlefield Tx & Lake A. H. US...
Could be the tach.
_________________________
“The world will not be destroyed by those who do evil, but by those who watch them without doing anything” Remember what He has done and remember that He is not done yet! GOD IS GOOD

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#11478376 - 03/15/16 07:59 AM Re: RPM's for Phoenix [Re: Jigfish]
Josh@SCP Offline
Angler

Registered: 04/27/07
Posts: 400
Loc: Winnsboro TX
If you are running 4000 rpm at wide open throttle trimmed up with the boat running 70 something mph then you have a tach issue. If it is doing none or only part of what I just mentioned then give me a call and either me or stve will help you figure out if you need a prop shop or a mechanic.
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#11479550 - 03/15/16 04:53 PM Re: RPM's for Phoenix [Re: Josh@SCP]
Chris B Offline
TFF Celebrity

Registered: 05/02/03
Posts: 6500
Loc: Prosper, TX
4000 Rpm's at 65 mph? Something isn't adding up or that is one fast boat. I would get the tach checked like stated above.
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#11503446 - 03/26/16 10:02 PM Re: RPM's for Phoenix [Re: Jigfish]
Jigfish Offline
Extreme Angler

Registered: 02/28/03
Posts: 2833
Loc: Tx
I took it back into fun and sun and they supposed to have replaced the Tach but I have run it a week and still running no more then 4000 rpm's.
_________________________
Thanks,

Kaufman High School Boat Captain

The weak call it obsession, the strong call it dedication!
Jigfish


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#11504882 - 03/27/16 08:36 PM Re: RPM's for Phoenix [Re: Jigfish]
Allison1 Online   sleepy
TFF Guru

Registered: 12/14/03
Posts: 17345
Loc: Grand Prairie, Tx
Something is wrong. At 4000 rpms @ 65 mph your prop would have to be thirty something to be right. If you are doing 65 GPS you must be doing at least in the low 5000 rpm's.

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#11505266 - 03/28/16 03:36 AM Re: RPM's for Phoenix [Re: Jigfish]
papamark Offline
Mini Tractor

Registered: 04/28/05
Posts: 10466
Loc: Winnsboro
I have a 921 with a 250 SHO and at 70 I am turning around 5500

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#11505655 - 03/28/16 09:16 AM Re: RPM's for Phoenix [Re: Jigfish]
Jigfish Offline
Extreme Angler

Registered: 02/28/03
Posts: 2833
Loc: Tx
Yea, that's 65GPS and not over 4000RPM's
_________________________
Thanks,

Kaufman High School Boat Captain

The weak call it obsession, the strong call it dedication!
Jigfish


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