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1988 SN replacement prop question |
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Splitrock 
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Joined: October-02-2022 Location: Austin, TX Status: Offline Points: 16 |
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 Topic: 1988 SN replacement prop questionPosted: March-05-2024 at 5:41pm |
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hi, I would like to get a new prop for a 1988 Ski Nautique. Currently I have the original 13x13 (OJ?) which I would like to keep as a spare.
I have been told I will get improved performance with a new prop - either a 3 blade or 4 blade. Been told the new 3 blade props are CNC and provide superior performance with greater surface areas. Also have been told that 4 blades have greater bite for better acceleration.
My application is exclusively slalom water skiing (no tower on boat) - what suggestions do you all have? Thanks! |
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75 Tique
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Joined: August-12-2004 Location: Seven Lakes, NC Status: Offline Points: 6097 |
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Posted: March-05-2024 at 7:09pm |
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I never had a boat appropriate for this prop, but for years and years I have read on here that an Acme 540 (13 x 12) is the go to prop for that boat. Everyone who has switched to it says it is a night and day difference. This is the best price I found, but you might find better. |
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Morfoot
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Joined: February-06-2004 Location: South Lanier Status: Offline Points: 5311 |
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Posted: March-06-2024 at 5:37am |
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The original prop on the 88' was a Federal and Larry is correct in suggesting the Acme 540 for Slalom. I promise you that you won't be disappointed. The grin on your face the first you drive it after the upgrade couldn't be removed with a 2 x 4. TRBenj is our local CCFan ACME Dealer so reach out to him to see if he can you the best bang for your buck. Let us know the results and thoughts when you upgrade.
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"Morfoot; He can ski. He can wakeboard.He can cook chicken.He can create his own self-named beverage, & can also apparently fly. A man of many talents."72 Mustang "Kermit",88 SN Miss Scarlett, 99 SN "Sherman"
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TRBenj
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Joined: June-29-2005 Location: NWCT Status: Offline Points: 21109 |
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Posted: March-06-2024 at 11:41am |
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Most 87-88 SN’s I’ve collected data from would do better with a 542.
Delta prop is probably your best source. |
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Morfoot
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Joined: February-06-2004 Location: South Lanier Status: Offline Points: 5311 |
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Posted: March-06-2024 at 1:16pm |
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Copied this from my post back in 2011 sfter I installed a 540 on my 88' SN. I have a 542 on it now as my neighbor gave it to me when he upraded his 88' to a 06' and I dinged up my 540.
WOW! Holy cow what a difference the 540 made on the boat. It's just as everyone has described here as the hole shot was incredible. The bow came up about half as much as it did with the Federal 13x13 and it was allot smoother. The boat seemed to handle more solidly and with just me and a 100lbs of weight on the observer side to balance it out she seemed to turn more solidly with less cavitation of the prop in high speed quick turns. I did (as expected) lose a little top end but it's rare that I throw the hammer down and run full throttle so that doesn't bother me. I did forget my notepad in the truck but took some snaps with my phone and recorded a few readings. It was money well spent and I too am looking forward to the first chance I have to ski and wakeboard behind her. Merry Christmas to me!
 This is on a stock 351 with pointless ignition with 890 hrs on her using a GPS for velocity. Weather conditons weren't ideal with a little breeze blowing. The water wasn't glass but if I were skiing I would have been all over it. 2200 - 22.2mph 2400 - 25.4mph 2650 - 28.3mph 3200 - 34.8mph 3550 - 38.1mph 3800 - 40.3mph 4600 - 43.5mph |
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"Morfoot; He can ski. He can wakeboard.He can cook chicken.He can create his own self-named beverage, & can also apparently fly. A man of many talents."72 Mustang "Kermit",88 SN Miss Scarlett, 99 SN "Sherman"
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Wilhelm Hertzog
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Joined: June-14-2014 Location: Cape Town Status: Offline Points: 327 |
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Posted: March-06-2024 at 3:25pm |
How do the 540 and 542 compare? I always thought 542 is the go-to for wakeboarding, not so much for slalom skiing? |
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1982 Ski Nautique PCM351W RR II Velvet Drive 10-17-003 1:1 II PerfectPass Stargazer
Do not go gentle into that good night. Rage, rage against the dying of the light. |
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Morfoot
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Joined: February-06-2004 Location: South Lanier Status: Offline Points: 5311 |
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Posted: March-06-2024 at 4:10pm |
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Hole shot is better on the 542 as it has a 11.5 pitch and the 540 has a 12.0 pitch. You'll lose a little more top end speed with the 42 but gain it in the hole shot. I like em both on the 88' and since I'm primarily slalom skiing anywhere between 30-34mph. I'm okay with either one.
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"Morfoot; He can ski. He can wakeboard.He can cook chicken.He can create his own self-named beverage, & can also apparently fly. A man of many talents."72 Mustang "Kermit",88 SN Miss Scarlett, 99 SN "Sherman"
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Splitrock
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Posted: March-06-2024 at 4:55pm |
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Thank guys!
Curious that for low wake applications, no one has suggested the Acme 430 (as recommended by https://acmemarine.com/pages/custom-fit) - or does the enlarged surface area of the 13x12 CNC blade compensate for the old school 13x13 configuration?
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KENO
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Posted: March-06-2024 at 5:46pm |
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Splitrock
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Posted: March-06-2024 at 9:32pm |
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Thanks Keno. I saw from my previous searches the thread on the new Acme 430 Prop Report. Good info, however I am not interested in achieving top speed or experimenting with different cup sizes. Unless we are talking women
 My preference is for a prop designed to pull one slalom skier (less than 200 lbs) behind a minimally loaded stock 1988 SN at 600 ft above sea level. Not into bare-footing so speed is not a top priority. Ideally I would like a rpm/speed ratio of 1/1 as I drive by tach  And the quest for transmission fluid/hydraulic oil was achieved! Link below. Thanks for the reminder! |
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Splitrock
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Posted: March-06-2024 at 9:43pm |
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Many thanks Morfoot. I came across your post from an earlier search. Great stuff I really appreciate the details!
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TRBenj
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Posted: March-07-2024 at 6:30am |
Have you ever verified the accuracy of your tach? Every prop and hull can have slight variations but those wot numbers would be inconsistent with the 2001’s I’ve tested. The boats able to pull a 540 4600rpm have run 45-46 (usually the earlier boats). The lower top speed in the 87-88 is consistent with what I’ve seen (sub-44) but usually aligns with a rpm below 4400. Hence my recommendation on the 542, which should raise rpm by ~150. If a 540 is holding revs below 4400 then the 542 should have a higher top end speed of the 2. (And slightly better holeshot, as you mention.) 430 is not a good choice even for the lighter 2gens with the 351w, imo- too much prop, especially for a 2001, and a later/slower one at that. The 474 would be a consideration on a faster hull. The 430 has proven to work well when mated to engines with a few more cubes- like stroker small blocks (383/393/408) or stock big blocks (especially in a slower hull like a 2001 or later dd bfn). |
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KENO
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Posted: March-07-2024 at 9:08am |
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Well look at all this advice and discussion
Since you liked my advice on the transmission fluid, I figured I'd give you some more advice and tell you to listen to the advice in this thread and not Acme's advice
Nobody here on CCF is on board with a 430, it'll lug your engine too much.. You haven't mentioned any speed/RPM numbers for your boat, but the 87/88/89 hulls with the driver and passenger moved forward were a little slower like TRB said. So......I think the best advice would be to take my advice to take the advice of the people who's advice was to use a 540 or a 542 People can argue about it but you're gonna be happy with either one and with either one you'll end up with a new higher RPM number for your skiing speed, with that number being a little higher with the 542. Morfoot is a good example, he's been happy with both on his boat And..........when you get your first look, you're gonna say "Look at the size of those big beautifully shaped things" and want to run your hands all over them.......The propeller blades that is |
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GottaSki
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Joined: April-21-2005 Location: NE CT Status: Offline Points: 3327 |
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Posted: March-07-2024 at 9:47am |
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You're overthinking ed
acme 12 is the new 13. acme 540/541 is still 1mph/100rpm. 430 will be like putting an historically 14p prop on, <gak> You are being given insight that your specific hull needs more rpm, hence the 542 recommendation. your not going to find better advice. Don't fear a touch more rpm. its not going to use more gas nor hurt the engine. Same work has to get done. btu's in, work out. your cruise vacuum will go up and throttle position slightly less to compensate for more power pulses/distance. A 30 dollar GPS bike speedometer and a swatch of velcro can give you .1mph resolution. |
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Morfoot wrote: