Vintage Speed |
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vernonfarmer
Groupie Joined: October-06-2013 Location: Vernon, WI Status: Offline Points: 91 |
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Thanks for the input....hoping for a decent day yet this fall to try the distributor adjustment. Have not checked the dwell but will do. I'm not familiar with what you said about "lap it to the shaft". And I'm so green I didn't know anything about tuning up a prop! What's that about?
John |
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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The 3300 is good so I wouldn't worry about the prop. Still, it would be a good idea to send it into the prop shop. A 11" diameter is hard to find so it's worth sending in for a tune up. Your speed is just about there. You may get some more out of it after the prop tune up but don't expect much. I get about 34 to 35 out of my Atom but I have the Hercules model B (60 HP) which is lighter than the Gray. Have you checked the timing? With the vintage engines it was and still is common to get to WOT and have someone advance the distributor for max RPM/speed and then back it off slightly. Dwell can be set with the feeler gauge. Have you checked it? When you get the prop back, don't forget to lap it onto the shaft. The one picture shows dings on the shaft so someone has been whacking on it. Maybe he didn't have a prop puller? The washer is only needed when the nut goes on the shaft too far so the cotter pin hole will line up better. This does happen when the prop taper is too deep.
BTW, this vintage engine can be run WOT all the time as they were made for it. Think about an old gen set were they would run at 3600 all day long. |
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63 Skier
Grand Poobah Joined: October-06-2006 Location: Concord, NH Status: Offline Points: 4234 |
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Both props from my '63 have the numbers on the end. Of course it's a relatively new boat compared to the Atom!
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'63 American Skier - '98 Sport Nautique
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Gary S
Grand Poobah Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096 |
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You don't need a washer just a brass castellated nut and a stainless cotter key. I doubt you'll find any numbers under the nut,that's a relatively new thing,and that's an old Federal prop
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vernonfarmer
Groupie Joined: October-06-2013 Location: Vernon, WI Status: Offline Points: 91 |
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Rainin' like heck out...would have to pull the boat out to get to the nut. Thinking that cotter pin should go. What should the nut and washer be? Brass?
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63 Skier
Grand Poobah Joined: October-06-2006 Location: Concord, NH Status: Offline Points: 4234 |
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John, no clue on the numbers. I think if you remove the castle nut and washer you might see the diameter and pitch embossed on the end under where the washer sits.
By the way, that castle nut and washer and pin aren't steel, are they? Kind of look that way in the picture. |
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'63 American Skier - '98 Sport Nautique
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vernonfarmer
Groupie Joined: October-06-2013 Location: Vernon, WI Status: Offline Points: 91 |
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Finally climbed under the Atom Skier to check out the prop. Not really sure what I'm looking for tho. Three pix of what's stamped on the prop for the experts to decipher for me?
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vernonfarmer
Groupie Joined: October-06-2013 Location: Vernon, WI Status: Offline Points: 91 |
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The speed shot was taken by my neighbor, Judy Wagner riding shotgun with her hubby Randy at the helm of their '46 Higgins 17' utility. Sweet ride!
We were on Lake Beulah on a sun drenched Sunday afternoon. |
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GlassSeeker
Grand Poobah Joined: November-26-2008 Location: Elk Grove, CA. Status: Offline Points: 2421 |
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Innovas 3340 multimeter has digital tach for about 80
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This is the life
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63 Skier
Grand Poobah Joined: October-06-2006 Location: Concord, NH Status: Offline Points: 4234 |
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Nice looking (and running!) boat John! That picture is great, love the smiles. If you ever have a chance please post a video of the boat at speed, would love to heat that Gray wound up, and at idle at the dock.
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'63 American Skier - '98 Sport Nautique
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JoeinNY
Grand Poobah Joined: October-19-2005 Location: United States Status: Offline Points: 5693 |
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That Gray 620 was rated at 3200 rpm, turning at 3300 would be exactly how I would prop it to keep the load a bit lower and to get those skiers out of the water. So whatever size and pitch that prop is seems just about right and the motor is relatively healthy and in reasonable tune, enjoy the heck out of it!
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skutsch
Grand Poobah Joined: June-19-2008 Location: Racine, WI Status: Offline Points: 2874 |
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Great stuff! Awesome to see that little atom scooting along!
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62 wood
Grand Poobah Joined: February-19-2005 Location: NW IL Status: Offline Points: 4527 |
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Keeping the passenger happy IS important for smooth operations! Depending on the actual slippage, I'm guessing an 11 or 12 pitch. btw, what water you running on? . |
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vernonfarmer
Groupie Joined: October-06-2013 Location: Vernon, WI Status: Offline Points: 91 |
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Nuts...I did not check the prop. Will do, tho...
But yeah...boat and driver happy! The passenger is having a good time too. |
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62 wood
Grand Poobah Joined: February-19-2005 Location: NW IL Status: Offline Points: 4527 |
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John,
Great picture!! The boat (and driver) look happy! Did you ever check the prop to see what pitch your running? |
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vernonfarmer
Groupie Joined: October-06-2013 Location: Vernon, WI Status: Offline Points: 91 |
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Got an old school analog Snap-On Tach/Dwell meter hooked up with a borrowed 12 volt battery. Alone in the Atom skier I got 31.1 mph at 3300rpm. Honestly, I don't need to go any faster than that in a 59 year old wooden boat. The motor sings and the wake is flat...what more can a guy hope for?
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phatsat67
Grand Poobah Joined: March-13-2006 Location: Indiana Status: Offline Points: 6148 |
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Go to O'reilly and buy the Innova timing light that has the tachometer feature. About 140 bucks but will be very useful to have in your tool box. Also reads dwell/voltage.
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vernonfarmer
Groupie Joined: October-06-2013 Location: Vernon, WI Status: Offline Points: 91 |
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How does one go about throwing a temporary tach on the old girl? I have never checked the prop for numbers either. That I will do in the daylight. But as for the tach...how is that done?
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62 wood
Grand Poobah Joined: February-19-2005 Location: NW IL Status: Offline Points: 4527 |
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John, might be worth throwing a temporary tach in the ol girl to see what she's spinning at WOT. What size wheel you running on it? I dont think your speed is that far off.
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SNobsessed
Grand Poobah Joined: October-21-2007 Location: IA Status: Offline Points: 7102 |
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Billy's back, now we need Pete!
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“Beer is proof that God loves us and wants us to be happy.”
Ben Franklin |
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boat dr
Grand Poobah Joined: June-27-2004 Location: United States Status: Offline Points: 4245 |
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Glad to see some wood on this site,lol...............
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phatsat67
Grand Poobah Joined: March-13-2006 Location: Indiana Status: Offline Points: 6148 |
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That little one we had is in need of tuning and ran about 28 mph on gps.
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vernonfarmer
Groupie Joined: October-06-2013 Location: Vernon, WI Status: Offline Points: 91 |
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Oh...that 30.3 was with with two people aboard.
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vernonfarmer
Groupie Joined: October-06-2013 Location: Vernon, WI Status: Offline Points: 91 |
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I don't have a tach, Gary. Thanks for the input.
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Gary S
Grand Poobah Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096 |
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Sounds on the low side,what rpm's was it turning? I had an 64 American Skier,same hull as the 65-70 Mustang,with a 70hp 4cylinder Gray,pre GPS days and it would turn 3600. I know Pete's Atom gets up and scoots but he's been MIA lately
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vernonfarmer
Groupie Joined: October-06-2013 Location: Vernon, WI Status: Offline Points: 91 |
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Finally got the GPS speedo out on the 1955 Atom Skier. The model 620 Gray Marine 4 flathead got the 14.5 woody up to 30.3 mph. Is this good...bad...or what? Gotta say...30 mph in that little boat feels like 70!
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