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  #1  
Old 09-18-2006, 10:35 PM
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Hoocher Hoocher is offline
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S&S propeller size

I just ordered a new prop from Delta Propellor Co. and they recommended a 13x13 LH 1" Ambush 4 propellor, which I received today. Much to my dismay, the old prop on my 85 S&S is a 14x18 LH 1-1/8" Nibral cupped propellor. The Mastercraft owners manual just mentions it is 13x13 stock, and does not state shaft size. I contacted several propellor companies and they all recommended a 1" shaft. Does anyone else have an old S&S with a 1" shaft?
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Old 09-18-2006, 10:48 PM
88 PS190 88 PS190 is offline
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do you have a powerslot transmission?

open the engine and look for velvet drive 1.5:1 ratio.

if so its a different prop than a 13X13 LH... thought they were all 1" shaft but icbw
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Old 09-18-2006, 10:53 PM
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JEREMY79 JEREMY79 is offline
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mine is a 1" shaft. I think the powerslots have the bigger prop
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Old 09-18-2006, 11:14 PM
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I believe I have a 1:1 ratio model 71C velvet drive.
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Old 09-18-2006, 11:24 PM
88 PS190 88 PS190 is offline
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i'd give that a check... only powerslots had the 14" unless someone upsized the whole shaft and prop... or something, that's odd.
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Old 09-18-2006, 11:44 PM
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man, there is no way a 1985 1:1 tranny could spin an 18 pitch prop up to 4000+ rpms ... on the bright side, sounds like you just found out you have a boat with Powerslot, which adds value to the boat

Prior to replacing your prop, what was the Max RPM's you could get on the boat?
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Last edited by PendO; 12-04-2006 at 01:50 PM.
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Old 09-18-2006, 11:59 PM
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from a different thread:

Quote:
Originally Posted by Sporty
You have the 1:1 tranny, however you also likely have the slotted hull configuration for the drive option. The 8th and 9th space from the engine serial number will read 10 for the 1:1 and 15 for the 1.5:1.
Check the Vin# on your boat ... I suppose it is also possible that along the way someone has replaced the tranny with a 1.5:1 and changed out the shaft size, so, if you look at the vin you can tell what tranny was OEM
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Last edited by PendO; 09-19-2006 at 12:03 AM.
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Old 09-19-2006, 12:04 AM
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You were correct it had the 1.52:1 velvet drive with the larger 14x18 prop. What were the advantages of this transmission? Any recommendations for prop size for wakeboarding?
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Old 09-19-2006, 12:08 AM
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I never maxed out the speed/rpm, since there was vibration and the lake I go to is very rough most of the time. The owners manual for the 85 doesn't have much info for this type of stuff?
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Old 09-19-2006, 12:20 AM
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Quote:
Originally Posted by Hoocher
I never maxed out the speed/rpm, since there was vibration and the lake I go to is very rough most of the time. The owners manual for the 85 doesn't have much info for this type of stuff?
Consider yourself luck to have the PS tranny and not even know it

Take a look at Acme or OJ Props ... you can contact these manf. directly if you want, OJ is the current OEM prop supplier to MC.

They can likely answer your questions much better than I, but if I were you (just wakebaording) I would want to try out a CNC'd 18 pitch prop and a prop one pitch size smaller.

The advantage of a smaller pitched prop is even better holeshot, but you do not want to risk overrevving your engine.

Lots of the new boats (I think all the MC's) come with new OEM 4 blad props ... typically having a 4 blade is like having wider tires, giving you more traction off the line, however ... like a mountain bike and a road bike (skinny tires are faster) typically the 3 blades in the same pitch are faster ... in recent years companies have come up with more precise manf. techniques and there are 3 blades that push as much water as 4 blades, but still have the top speed advantage.

Carefull about going to a stainless steel prop if you are ever at risk of hitting something as the SS will not bend and the damage will go to more expensive parts (shaft on up) ... whereas the nibral will bend easier and hopefully prevent damage up the shaft.
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Last edited by PendO; 09-19-2006 at 12:35 AM.
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