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External
Since: Jul 22, 2007
Posts: 1
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(Msg. 1) Posted: Sun Jul 22, 2007 2:11 pm
Post subject: Prop Help
Archived from groups: rec>boats (more info?)
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| I recently bought a 1987 Rinker 250 with Mercruiser Alpha One 260 (5.7
liter). There are no markings on the existing prop, but it appears to
be almost a flat prop - no cupping. The performance is poor, but WOT
is about 5500 RPM. Looking for suggestions for a new proip, or at
least a starting point. I don't want to spend thousands of dollars to
dial it in.
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>> Stay informed about: Prop Help |
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External
Since: Feb 21, 2006
Posts: 126
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(Msg. 2) Posted: Sun Jul 22, 2007 2:33 pm
Post subject: Re: Prop Help [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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sounds like it's right, 5500 is w/in range for a 350, isn't it?
On Sun, 22 Jul 2007 14:11:32 -0700, fireguy <bruce RemoveThis @completefire.com> wrote:
>I recently bought a 1987 Rinker 250 with Mercruiser Alpha One 260 (5.7
>liter). There are no markings on the existing prop, but it appears to
>be almost a flat prop - no cupping. The performance is poor, but WOT
>is about 5500 RPM. Looking for suggestions for a new proip, or at
>least a starting point. I don't want to spend thousands of dollars to
>dial it in. |
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External
Since: Mar 02, 2007
Posts: 3620
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(Msg. 3) Posted: Sun Jul 22, 2007 6:56 pm
Post subject: Re: Prop Help [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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On Sun, 22 Jul 2007 14:11:32 -0700, fireguy <bruce RemoveThis @completefire.com>
wrote:
>I recently bought a 1987 Rinker 250 with Mercruiser Alpha One 260 (5.7
>liter). There are no markings on the existing prop, but it appears to
>be almost a flat prop - no cupping. The performance is poor, but WOT
>is about 5500 RPM. Looking for suggestions for a new proip, or at
>least a starting point. I don't want to spend thousands of dollars to
>dial it in.
Clean the inside of the prop of exhaust residue and the size and pitch
will be stamped where the prop hub meets the shaft spline.
I think you might want to drop the rpms a little - that seems awful
high for a 350. >> Stay informed about: Prop Help |
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External
Since: Jun 14, 2007
Posts: 25
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(Msg. 4) Posted: Mon Jul 23, 2007 9:21 am
Post subject: Re: Prop Help [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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On Jul 22, 5:33 pm, Josh Assing <Xjo... DeleteThis @jAssing.com> wrote:
> sounds like it's right, 5500 is w/in range for a 350, isn't it?
>
>
>
> On Sun, 22 Jul 2007 14:11:32 -0700, fireguy <br... DeleteThis @completefire.com> wrote:
> >I recently bought a 1987 Rinker 250 with Mercruiser Alpha One 260 (5.7
> >liter). There are no markings on the existing prop, but it appears to
> >be almost a flat prop - no cupping. The performance is poor, but WOT
> >is about 5500 RPM. Looking for suggestions for a new proip, or at
> >least a starting point. I don't want to spend thousands of dollars to
> >dial it in.- Hide quoted text -
>
> - Show quoted text -
If I remember correctly, I think that wide open should be more like
4400 RPM's. >> Stay informed about: Prop Help |
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External
Since: Mar 04, 2007
Posts: 867
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(Msg. 5) Posted: Mon Jul 23, 2007 2:08 pm
Post subject: Re: Prop Help [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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On Mon, 23 Jul 2007 09:21:21 -0700, Capt John <jscanlon DeleteThis @parker.com>
wrote:
>> >I recently bought a 1987 Rinker 250 with Mercruiser Alpha One 260 (5.7
>> >liter). There are no markings on the existing prop, but it appears to
>> >be almost a flat prop - no cupping. The performance is poor, but WOT
>> >is about 5500 RPM. Looking for suggestions for a new proip, or at
>> >least a starting point. I don't want to spend thousands of dollars to
>> >dial it in.- Hide quoted text -
>>
>> - Show quoted text -
>
>If I remember correctly, I think that wide open should be more like
>4400 RPM's.
Yes, 4400 to 4500 is about right. I used to have the same engine in a
comparable boat. It had a 15 x 17 prop which was OK when I bought it,
a 14 1/2 x 17 was even better. >> Stay informed about: Prop Help |
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