Prop sizing for 83 SN at Altitude
Printed From: CorrectCraftFan.com
Category: General Correct Craft Discussion
Forum Name: General Discussion
Forum Discription: Anything Correct Craft
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=42874
Printed Date: April-28-2024 at 7:47am
Topic: Prop sizing for 83 SN at Altitude
Posted By: cspruill
Subject: Prop sizing for 83 SN at Altitude
Date Posted: June-02-2018 at 1:47am
I moved to Utah from Indiana about a year ago. I re-jetted the carb, installed a drop in electronic ignition/ coil and changed the prop from 13X13 to 13X11. These changes made a marked improvement for slalom but at WOT I'm only turning 3,700 RPM & 36-38 mph on GPS depending on wind. The lakes I'm on are between 5-7k feet elevation. Should I try a different pitch on the prop? Any suggestions would be greatly appreciated!
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1983 Ski Nautique 2001
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Replies:
Posted By: 8122pbrainard
Date Posted: June-02-2018 at 7:54am
Cam,
When you installed the EI conversion, did you check the timing and advance? Tell us more about the re jetting of the carb. Are the carb secondaries opening?
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54 Atom
/diaries/details.asp?ID=2179" rel="nofollow - 77 Tique
64 X55 Dunphy
Keep it original, Pete
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Posted By: cspruill
Date Posted: June-02-2018 at 12:37pm
Timing is set to 8 degrees advance on Pertronix 1582 EI. On carb, I dropped down two jet sizes from stock (don't recall the actual jet size but I can find out if that would be helpful). Plugs are a little darker than cinnamon but not close to fouled. I can hear the secondaries opening at WOT, Fuel filter is clean. Is it possible the throttle linkage is not achieving true WOT? Thanks
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1983 Ski Nautique 2001
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Posted By: Jonny Quest
Date Posted: June-02-2018 at 2:09pm
What elevation are you typically boating? Heber City means that Deer Creek and Jordanelle are likely. At that elevation, you could decrease carb jet sizes by 3. Timing could be 10 degrees BTDC at altitude. Also, prop could be 1" pitch size smaller.
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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Posted By: cspruill
Date Posted: June-02-2018 at 2:54pm
Thanks Rob! Got your PM as well. Will give you a ring!
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1983 Ski Nautique 2001
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Posted By: cspruill
Date Posted: June-13-2018 at 4:30pm
Well, after adjusting timing to 10 degrees BTDC and swapping out the old Federal 13X11 for a new Acme 912 13 X10.5, the boat is a rocketship! The holeshot is amazing, no more vibrations under load, RPMs are now at 4,400-4,600 at WOT @ 40mph. Thank you JQ for the tips and for getting me connected with Gary at Delta Props. Very happy with the results!
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1983 Ski Nautique 2001
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Posted By: Jonny Quest
Date Posted: June-15-2018 at 10:42pm
Glad it worked out. Let’s go turn & burn soon.
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
|
Posted By: cspruill
Date Posted: June-15-2018 at 10:55pm
Text me when you need a third. I'm going tomorrow morning at 6:30 at Jordanelle if you want to join me.
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1983 Ski Nautique 2001
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