Re: [OMC-Boats] Engine RPM and Boat Speed

Hi Kenneth,

Wow. Running a 19" SST is like running a 20" Alumin. That's a lot of pitch
to swing, especially at Western altitudes. That baby must move right along
at idle RPM? How do you bring her into a dock?

I'd say if you can over-rev a 19" prop (assuming standard gearing)
something's gotta be slipping. Have you tried different props?

BTW, 90 hp 16-fters would get a little more than 30 mph when new. Of course
they had a weight savings advantage over the 4 strokes.

/LS

----- Original Message -----
From: "Kenneth Fingerlos" <kenf@...>
To: <omc-boats@...>
Sent: Tuesday, July 22, 2008 9:03 PM
Subject: Re: [OMC-Boats] Engine RPM and Boat Speed

> Don -
>
> Please do let us know what you find out; I've got a 1968 Seasport-II 155
> with similar issues; Slower than Lee's stuff says it should be and I'm
> running a 19" stainless prop. Seems like I've got plenty of power, can't
> run it at WOT because it'll over-rev, but really can't get above 30MPH.
> Slippage somewhere sounds like a very interesting idea - had a car once
> with a bad clutch which behaved kinda similarly.
>
> Kenneth Fingerlos
> Northern Idaho
>
>>>> On Tuesday, July 22, 2008 at 7:21 PM,
>>>> <omc-boats-request@...>
>> Message: 4
>> Date: Tue, 22 Jul 2008 19:09:00 -0700
>> From: Don Mandelas <dmandelas@...>
>> Subject: Re: [OMC-Boats] Engine RPM and Boat Speed.
>> To: "Evinrude & Johnson Boats of the 1960's and 70's"
>> <omc-boats@...>
>> Message-ID: <BLU118-W13EE6EF795282C3898E244DA840@...>
>> Content-Type: text/plain; charset="iso-8859-1"
>>
>>
>> Thank's Again everyone for your help and advice!
>> You have given me some good ideas that could help fix my problem.
>>
>> Starting Tommorow morning I will look into the tackometer issue to see if
>> it
>> is reading correctly,
>> And, I will contact a qualified OMC repair man to see what can be done if
>> the forward clutch hub is slipping.
>>
>> And Thank you for asking, Yes, I am using Type C lower unit gear lube.
>> Don Mandelas
>> Washington State.
>
> _______________________________________________
> OMC-Boats mailing list
> OMC-Boats@...
> http://lists.ultimate.com/mailman/listinfo/omc-boats
Received on Tuesday, 22 July 2008