Re: [OMC-Boats] Planning on installing a 14x18 soon as I can locate one.

Hi Todd,

What are your goals in wanting to change props? Higher top speed? Better fuel economy at cruise speed? Better hole shots for yanking up skiiers?

RE: <<Planning on installing a 14x18 soon as I can locate one.>>

You didn't state if the boat was fully or lightly loaded, and at what altitude you were operating. And given the mixed pedigree, who knows what gear ratios are now in there?

When new your rig was brand new it was capable of running a WOT 4200 - 4500 RPM, which would typically yield (with one or two passengers at sea level) about 38 - 39 mph.

If your "hard running" is only able to yield a true 3000 rpm and 32 mph at WOT (Wide-Open-Throttle) then moving up in pitch won't change much except lower the maximum WOT RPM. In fact, without additional evidence, I'd hazzard aguess that you might want to consider going down in pitch.

Lee

________________________________
From: omc-boats-bounces@... [mailto:omc-boats-bounces@...ultimate.com] On Behalf Of Todd Dixon
Sent: Wednesday, July 15, 2009 11:55 AM
To: OMC
Subject: [OMC-Boats] Fw: 4-bolt versus 5-bolt

----- Forwarded Message ----
From: Todd Dixon <todddixon@...>
To: OMC <OMC-Boats@...>
Sent: Wednesday, July 15, 2009 11:33:14 AM
Subject: 4-bolt versus 5-bolt

I'm running a 5-bolt upper gear case on my '67 reveller 155, with a 4-bolt lower. Took her out last saturday and she ran fine for about 2 hrs. solid, of hard running. Ran about 32 m.p.h. a little over 3000 r.p.m. Also using a 14x16 prop, all I got right now. Planning on installing a 14x18 soon as I can locate one. Is there anything wrong with this type of set-up.

Todd
Received on Wednesday, 15 July 2009