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 Catalina 25 Specific Forum
 New Engine Prop Question		  New Topic  Topic Locked
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Gary
1st Mate

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58 Posts
Initially Posted - 11/11/2003 :  11:02:20  Show Profile
Recently bought a new Nissan 8HP 2 cycle long shaft electic start for my old C-25 swinger. The new engine has enough power, but does not have as much thrust as the '85 Yamaha 9.9 high thrust engine it replaced. The new engine came with a 7.5" pitch prop. Nissan has an optional prop with a 6.5" pitch (same diameter as the 7.5" one). How much difference would the optional prop make? Smooth sailing and thanks in advance. Gary
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Frank Hopper
Past Commodore

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Pitcairn Island
6776 Posts
Response Posted - 11/11/2003 :  18:40:10  Show Profile  Visit Frank Hopper's Homepage
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by Gary</i>
<br />Recently bought a new Nissan 8HP 2 cycle long shaft electic start for my old C-25 swinger. The new engine has enough power, but does not have as much thrust as the '85 Yamaha 9.9 high thrust engine it replaced. The new engine came with a 7.5" pitch prop. Nissan has an optional prop with a 6.5" pitch (same diameter as the 7.5" one). How much difference would the optional prop make? Smooth sailing and thanks in advance. Gary
<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">
I do not know squat about this other than what I have read lately looking for a replacement prop for my Johnson. I understand that a smaller # is better and that we should all be using a 5. Remember there are a lot of prop companies out there.
Edited by - Frank Hopper on 11/11/2003 18:40:54
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Dave Bristle
Master Marine Consultant

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Djibouti
10005 Posts
Response Posted - 11/11/2003 :  19:00:19  Show Profile
It won't match your Yamaha, because the diameter is smaller and you have less torque driving it, but 6.5 should perform better on your boat. How much better? About this much... You'll use slightly higher RPMs to cruise at any given speed, but you'll get a little more thrust to stop, start, and maneuver around a dock or trailer.
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Frank Hopper
Past Commodore

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Pitcairn Island
6776 Posts
Response Posted - 11/11/2003 :  21:14:04  Show Profile  Visit Frank Hopper's Homepage
Go here
http://www.acepropeller.com/pages/composite.html
Call them and ask them if they have what you need. They had 5 pitch for mine.
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osmepneo
Past Commodore

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USA
1420 Posts
Response Posted - 11/12/2003 :  11:24:01  Show Profile
Gary, I'd be interested in an evaluation report of your new ob. I thinking either Nissan 8 or 9.8, 2 stroke, extra long shaft. Any input you could give would be appreciated.
Edited by - osmepneo on 11/12/2003 11:24:25
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Derek Crawford
Master Marine Consultant

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USA
3323 Posts
Response Posted - 11/12/2003 :  11:58:13  Show Profile
Gary, I bought a new prop with 6.5" pitch for my 8hp Nissan. It does make manoevering in close quarters at low revs much easier. The factory rep told me it would add about 200 rpm's at cruising speed.
Derek
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Gary
1st Mate

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58 Posts
Response Posted - 11/13/2003 :  11:58:44  Show Profile
Don, I've only had my Nissan 8HP on the boat for a couple months, but I like it so far . It has enough power to push the boat into a stiff breeze and a good chop. With the long shaft I get a little cavitation in a stiff chop or a big wake (love them stinkpots), but I've just been lowering the motor to the first stop. The motor is very easy to start with either the pull cord or electric start and the controls are easy to reach. Weight was the main reason I choose this particular outboard. At 70 lbs. it's MUCH EASIER and SAFER to raise, lower, and tilt than my old 4-stroke. My boat balances better, too. On the downside it's quite a bit noiser than a 4-stroke and low speed maneuvering is not so hot. Based on the feedback I've gotten here, I'm gonna order the lower pitch prop. I bought the motor from onlineoutboards and received it within a week. Don, hope this helps 'cause I'm tired of typing. Gary on the "Renegade"
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.