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Nautiquehunter
Platinum Member Joined: December-31-2008 Location: Lake Lanier GA Status: Offline Points: 1010 |
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Thanks guys once again you have set me on a clear path . I don't know what I was thinking it will be easy to set it up with the original rub marks on the shaft. It looks like I will be in the market for a 12 or 12.5'' prop . If anybody has one or knows where to get one please let me know.
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KENO
Grand Poobah Joined: June-06-2004 Location: United States Status: Offline Points: 10717 |
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If you look at these pictures from earlier in this thread (in the quote below from December of 2018) when you mocked things up, it shows what you had for distance when using the rub/witness marks that the strut bearing made on the shaft like Pete mentioned earlier today. Why not set it up with the same strut to prop distance and plop the engine in place. That would have the engine in it's original location (or really, really close) and you'd have what looks to be maybe 1 1/4 to 1 1/2 inches of distance between the strut and prop and a decent amount of clearance between the prop and hull with a 12 inch LH prop. Kinda "just like CC built it" Is the strut to prop distance optimal............no, it could be better but CC built a whole bunch of boats with well over the 1 1/2 inches you have and they ran fine, without bending the shaft or vibrating you to death due to a little more "overhung load" Then you can run the boat and make sure it doesn't flip or violently eject you right out since it's a LH engine in a short skinny CC You might even be able to test it with the 13 inch prop you have now even though a 12 inch diameter seems much better suited to the Mustang, at least to see how it runs, then make any prop and shaft decisions from there.
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MourningWood
Gold Member Joined: June-13-2014 Location: NorCal Status: Offline Points: 889 |
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My guess is that Pete is saying the use of a smaller diameter prop may result in higher rpm per given boat speed. I think using the original strut (and resultant shaft angle) might be one of the more important performance criteria. Very cool boat.
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1994 Ski Nautique "Riot"
1964 Dunphy X-55 "One 'N Dun" 'I measured twice, cut three times, and it's still too short!" |
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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All I know is spinning a SBF faster than the published has been mentioned many times. 5K? Mike, What if any engine mods were done? Did I miss that part?
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Gary S
Grand Poobah Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096 |
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I don't know Pete- PCM rated their 351 at the same rpm as their 302- 4,400. They also only rated it at 25 hp more. Maybe the 351 shines more in the torque department figures they didn't publish.
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Mike,
Do you have the original shaft? If so, then there should be a witness mark where it ran in the cutlass. Getting the shaft in the hull lined up to match the marking would be a good start for position. I agree with Gary that the engine should go in the same spot as the original. Don't worry about the 13" prop diameter. The 12" or as mentioned the 12.5" diameter might be a great choice keeping in mind you will be cranking that prop at a higher RPM than the original.
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ultrarunner
Platinum Member Joined: October-02-2005 Location: Ridgefield, Ct. Status: Offline Points: 1809 |
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Yep, you definitely need to have the correct size prop on hand, placed in the correct spot to determine the proper length of shaft.
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Morfoot
Grand Poobah Joined: February-06-2004 Location: South Lanier Status: Offline Points: 5312 |
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Don't now how long the shaft is on the 72'but I do know that it's a 12" wheel An ACME 1210 I think. Uncle Todd, Tim, Joe and Mars are way more verse in the realm of repowering or adding more horses under the cover than anyone. My .02 is to stay with the 12" prop since you're using the same strut that came of it. You may have to go with 1214 or 2068. |
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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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Gary S
Grand Poobah Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096 |
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I would also tap into TRBenj's prop knowledge as well. You won't be fitting a 13" anything under that
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ultrarunner
Platinum Member Joined: October-02-2005 Location: Ridgefield, Ct. Status: Offline Points: 1809 |
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Yep, simply put the engine where it needs to be to get the correct dimensions. Then order the correct length shaft.
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Gary S
Grand Poobah Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096 |
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Much like putting a rear end in a car- you don't move the axle to match the driveshaft you have,you put the axle where it needs to go and shorten or lengthen the drive shaft as needed. I would adjust the engine mounts to be half way in their travel and go from there,it should sit where the old engine was. A 351 is 45 pounds heavier than a 302 anyway,a Mustang certainly does not need any more weight up front. Once the engine is mounted then the driveshaft can be fitted for length
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Riley
Grand Poobah Joined: January-19-2004 Location: Portland, ME Status: Offline Points: 7952 |
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I would ask other Mustang owners what the distance is from the shaft log to the transmission flange and start there. I think 1st gen Mustangs typically use a 12" prop and a 40" shaft.
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ultrarunner
Platinum Member Joined: October-02-2005 Location: Ridgefield, Ct. Status: Offline Points: 1809 |
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Hi Michael, someone will chime in with the exact spec, but you basically want to shoot for 1 inch between the prop and strut and 2 inches between prop and hull. Those numbers may be slightly different on the older boats, but likely not by a lot.
My guess in your application is you’re going to have to move the motor a bit more aft which may result is getting a new shaft. Mark |
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Nautiquehunter
Platinum Member Joined: December-31-2008 Location: Lake Lanier GA Status: Offline Points: 1010 |
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The boat was a basket case when I got it engine was in pieces . It came with a 12x13 RH prop. The doner boat is a 1985 Supra comp 351 w and a 13x13 LH prop . I thought I would be ok because I am using the engine and trans out of the Supra. I read the post [ Barracuda strut to prop distance] and I am more confused than ever. If I move the engine forward to get about 1'' clearance between the prop and strut the 13'' prop is about 3/8'' clearance between to the hull. I can move the engine back to get more clearance but that adds more distance between the strut and prop. I guess what I am asking is what is more critical distance between the prop and strut or distance between the prop and hull?
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Mike, At the progress you are making, it looks like you will be able to get Tweety to the SJRR. Looking fantastic!
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Morfoot
Grand Poobah Joined: February-06-2004 Location: South Lanier Status: Offline Points: 5312 |
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Tweety may have to be renamed Speedy with that 351 in him. I can't wait to drive it!
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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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Nautiquehunter
Platinum Member Joined: December-31-2008 Location: Lake Lanier GA Status: Offline Points: 1010 |
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We have decided to put the original ladder back on . The aluminum frame was damaged and seemed too weak so I had it bent out of stainless. The teak steps are fine just need refinishing. Work continues one setback is a oil leak on the engine the brass drain plug fitting is stripped . I found a new one but 2 weeks delivery. I put a temporary plug in so I can continue with the install.
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ultrarunner
Platinum Member Joined: October-02-2005 Location: Ridgefield, Ct. Status: Offline Points: 1809 |
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On the platform, I think it really makes the boat more usable and a ton safer. As a compromise, you might consider simply making the platform just a touch smaller in depth, as opposed to the larger dimension rectangle platforms that were originally introduced. This may keep the boat more aesthetically pleasing and dimensionally more correct. Additionally, you might consider using a mahogany vs. the teak, and the former is less dense, but also very durable, and will keep the boat lighter, which of course is good when you're hanging it off the back of the boat.
Mark
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Donald80SN
Grand Poobah Joined: January-12-2009 Location: Denver, NC Status: Offline Points: 3889 |
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WOW looks great !!!!!!!!!!! Should pop in the Sun .
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1980 Ski Nautique SOLD Back to Cypress Gardens
2002 Sport Nautique, GT-40, FCT2, Cover Sports, Tower Bimini, Inc., Wet Sounds Audio System, Star Gazer Wake Edition S. 1968 Ski Nautique, Project. |
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Nautiquehunter
Platinum Member Joined: December-31-2008 Location: Lake Lanier GA Status: Offline Points: 1010 |
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I already have the motor and trans done and ready to go in I am thinking a water test this weekend.
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67 ski nat
Platinum Member Joined: July-19-2018 Location: Santa rosa Status: Offline Points: 1184 |
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She is beautiful.
Drivetrain will be fun to watch too |
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Air206
Grand Poobah Joined: September-28-2008 Location: Roanoke, VA Status: Offline Points: 3000 |
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REALLY Looking GREAT Mike!
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Nautiquehunter
Platinum Member Joined: December-31-2008 Location: Lake Lanier GA Status: Offline Points: 1010 |
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At long last the interior is done. Front seat brackets made and seats installed . Rear seat made and installed . We are very pleased with the end result . We have a lot of hours in it but the actual dollar amount is still within reason. Next step is trailer and drive train.
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Nautiquehunter
Platinum Member Joined: December-31-2008 Location: Lake Lanier GA Status: Offline Points: 1010 |
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We are working on the interior . I set the seats engine cover and pylon in boy is this boat getting SMALL . I think it was made for kids or munchkins . The rear seat is next then the drive train . I will post pics later.
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pjsmoreno
Senior Member Joined: April-25-2016 Location: Liberty, Mo Status: Offline Points: 166 |
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That will be an eye catcher once it's on the water!!
What dedication and a fine job!
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samudj01
Gold Member Joined: March-10-2009 Location: NC Status: Offline Points: 947 |
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Very nice. Looking forward to more updates!
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78 Ski Tique, 72 Skier w/302's, 93 SN w/351 & 17 GS22 w/zr409
Previous - 99 Sport Nautique w/GT40 and 87 Martinique w/351 |
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Nautiquehunter
Platinum Member Joined: December-31-2008 Location: Lake Lanier GA Status: Offline Points: 1010 |
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Thanks guys its not a museum piece there are plenty of flaws if you look close enough . I wish I had started with something in better shape to start with . It's been 2 years and endless hours . When I think back to when I first got it my brother in law said you gotta be nuts to fix that thing . Then Morfoot came over and went crazy over the fact I had a Mustang. He has been very encouraging and supportive keeping me on track . I got the boat for free I am still debating whether I paid too much. The name of the boat is Tweety in line with Tims Kermit.
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NCH20SKIER
Grand Poobah Joined: December-16-2004 Location: United States Status: Offline Points: 2207 |
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Very nice indeed
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'05 206 Limited
'88 BFN |
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Morfoot
Grand Poobah Joined: February-06-2004 Location: South Lanier Status: Offline Points: 5312 |
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Gail does Fantastic work! She did the Drivers seat and observer seat bottom in Miss Scarlett and recently made a custom cover with side skirts for her too using Sunbrella canvas. She's a woman of many talents... She sold us the lake home we're in too. Looking good Mike. Holla' if you need an extra hand this weekend.
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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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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Mike,
Great job on the upholstery. You should go into the business! (or your wife)
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