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wesley64 
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Joined: June-21-2015 Location: Canada Status: Offline Points: 14 |
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 Topic: propellerPosted: June-27-2015 at 5:37pm |
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hello all,i have a 1991 sn 351 pcm and 1.23-1 trans.my prop is a 3 blade 14rh16.
is this the correct prop?just wondering. thanks brett |
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MrMcD
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Joined: January-28-2014 Location: Folsom, CA Status: Offline Points: 3749 |
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Posted: June-28-2015 at 12:14am |
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It may be the correct one but many have found improvement with the 4 blade acme.
I run a 224, I think many more prefer the 422. In my case the 4 blade Acme is quieter, smoother, faster and has more torque pulling load. I don't know an objection other than the $450 to buy one. PS: I should note this is with the 310 HP 351 Pro Boss and it will RPM over 5,000 with this combo. |
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Jonny Quest
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Joined: August-20-2013 Location: Utah--via Texas Status: Offline Points: 2976 |
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Posted: June-29-2015 at 3:13am |
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OJ 14 X 16 3-blade was the standard prop back in the day. The new CNC props will be a noticeable improvement. I'm at high altitude (4,000+ feet) with the High Output 351W. I run an Acme 654 4-Blade 12.5 x 15 RH 1" Bore .105 Cup. At sea level, I run an Acme 422 4-Blade 12.5 x 15.5 RH 1" Bore .105 Cup
Which engine do you have? If it is a "PLD" engine (260 H.P.) then you may want to consider the Acme 654. Do some searches in General Discussion and you will find many threads on props. JQ |
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Current
2003 Ski Nautique 206 Limited Previous 2001 Ski Nautique Open Bow 1994 Ski Nautique Open Bow Aqua skiing, ergo sum |
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wesley64
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Joined: June-21-2015 Location: Canada Status: Offline Points: 14 |
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Posted: June-30-2015 at 2:09am |
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thanks,it is the 351 pcm that came with the pcm engine management system.
240hp? brett |
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wesley64
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Joined: June-21-2015 Location: Canada Status: Offline Points: 14 |
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Posted: June-30-2015 at 2:11am |
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the max rpm is about 3600 roughly 45mph
brett |
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TRBenj
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Joined: June-29-2005 Location: NWCT Status: Offline Points: 21184 |
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Posted: June-30-2015 at 8:19am |
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I don't think so... Better check your gauges. |
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JPASS
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Joined: June-17-2013 Location: Orlando Status: Offline Points: 2283 |
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Posted: June-30-2015 at 8:38am |
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+1 May RPM on my '92 is roughly 5000 RPM. |
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'92 Correctcraft Ski Nautique
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8122pbrainard
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Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Posted: June-30-2015 at 7:54pm |
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WOW! Bret, is that what you are getting on the tach? If so, as mentioned, somethings wrong. Get a shop tach hooked up and find out. The only 3600max engines I know of are old flat head 4's, 6's and 8's. |
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Jonny Quest
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Joined: August-20-2013 Location: Utah--via Texas Status: Offline Points: 2976 |
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Posted: June-30-2015 at 9:47pm |
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Per PCM Owners Manual:
4,400 RPMs as a max intermittent cruise 3,600 RPMs as continuous cruise In a properly set-up boat, you should be able to turn maximum RPMs with your propeller. If not, something is wrong, such as propeller diameter/pitch or engine problems. I'd double check the tachometer first. Take a GPS unit and see what the wide open throttle speed is per the GPS unit. |
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Current
2003 Ski Nautique 206 Limited Previous 2001 Ski Nautique Open Bow 1994 Ski Nautique Open Bow Aqua skiing, ergo sum |
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wesley64
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Joined: June-21-2015 Location: Canada Status: Offline Points: 14 |
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Posted: June-30-2015 at 10:55pm |
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i used gps on my phone but maybe the tach is not correct.
maybe i will check again tonight. brett |
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wesley64
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Joined: June-21-2015 Location: Canada Status: Offline Points: 14 |
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Posted: July-02-2015 at 2:22pm |
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checked it again on phone gps.3800 rpm 41-42mph.wide open
i will see if secondaries are opening all the way brett |
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wesley64 wrote: