93 S/N erratic gauges
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=39442
Printed Date: May-04-2024 at 6:51am
Topic: 93 S/N erratic gauges
Posted By: diggit
Subject: 93 S/N erratic gauges
Date Posted: July-23-2016 at 2:05pm
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I have a new-to-me 93 SN with the standard 351 motor (not GT, not EFI) and upgraded to protec. I have three gauges on the dash that have issues: - RPM reads significantly low. at WOT it displays 3500. At idle it'll show 400 rpm. It seems to stay consistently low, and doesn't fluctuate or bounce around - temp gauge will often display 220 or higher. tapping on it drops it down to 170 - fuel gauge shows full when it's full, then within approximately a gallon or maybe two of usage it'll show 2/3, and drop fast to 0 from there. I've run it so it won't bounce off 0, then filled it up, and it took 22 gallons, so I still had 5 gallons in it I've read that 93's had common issues with these gauges, but I'm not finding via search any standard fixes for each. Any suggestions? ------------- '93 Ski Nautique Black/Teal '77 Ski Nautique. Loved it. Let it Go. |
Replies:
Posted By: Blamey
Date Posted: July-23-2016 at 3:17pm
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I'd guess the issue is due to poor grounding. Search for dash ground issues. ------------- 96 Super Sport Previously: 95 Sport Nautique, 1980 Ski Supreme |
Posted By: velde99
Date Posted: July-23-2016 at 7:57pm
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Your idle needs to be adjusted on your carb to idle at about 750 rpms. These engines have govoners on them. My 351 wide open is in 3800 range. Fuel gauge may be ground or the sender and same with temp. Temp should run in the 155 range. Lots of things to eleminTe. These gauges are pretty good. I'd trace issues back to gauges- versus going from gauges back. Good luck! |
Posted By: KENO
Date Posted: July-25-2016 at 2:46pm
What does this mean ? Only thing I can think of is your prop is holding down your RPM's or if you're talking Pro Tec an electronic rev limiter which definitely shouldn't be kicking in at 3800 RPM or your tach is off by a country mile or 2. KenO |
velde99 wrote:Posted By: velde99
Date Posted: July-25-2016 at 2:52pm
| These engines have govoners to protect engine. My 351 runs at 48mph at 3800 rpms. It had a 6k tach and you'll never reach that. My bit runs and performs great. Prop could play a role as well- but my boat is 100% original factory. Has 51 original hours on it. |
Posted By: KENO
Date Posted: July-25-2016 at 2:53pm
| What kind of governor |
Posted By: 8122pbrainard
Date Posted: July-25-2016 at 2:57pm
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I was wondering the same too! ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: KENO
Date Posted: July-25-2016 at 3:05pm
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I'm thinking this is one of your v drive Excel's. What's the gear ratio and prop pitch? Pro Tech with rev limiter? Carburetor? Only thing I'd question is the RPM's The 48 mph sounds OK to me |
Posted By: velde99
Date Posted: July-25-2016 at 3:07pm
| I emailed PCM rep and he said the max RPM on a 351 is 4400. I miss spoke. He said prop |
Posted By: KENO
Date Posted: July-25-2016 at 3:13pm
I'm not sure what you're saying about the prop Still wondering about the stuff I asked earlier though. |
Posted By: velde99
Date Posted: July-25-2016 at 3:46pm
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Prop on my 1991 excel is a 14 x18. Running original pro-tech -and it is carboarated. The prop would be the variable is what he is saying. The engine maxes out at 4400 rpms. |
Posted By: KENO
Date Posted: July-25-2016 at 4:10pm
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So the prop is the governor? I'd put a new governor on and get the RPM's up to 4400. so the engine isn't working so hard all the time. If I'm not mistaken (and I very well could) be that's the 285HP engine and it likes to be running more like 4400 to 4800 at full throttle. Or at least 4400 |
Posted By: velde99
Date Posted: July-25-2016 at 4:25pm
| That's how it was set up from the factory. Best of luck solving your issues. Enjoy the water |
Posted By: Gary S
Date Posted: July-25-2016 at 4:45pm
I know Tim has always said GT40's like to spin,he shoots for 5K but I don't know if carb versions are the same. In one of these boats I think it's almost impossible to run more mph than rpm's except for Joe's boat  ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=1711&sort=&pagenum=1&yrstart=1966&yrend=1970" rel="nofollow - 69 Mustang HM SS 95 Nautique Super Sport |
Posted By: TRBenj
Date Posted: July-25-2016 at 4:49pm
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To underturn rpm vs Mph takes cubes, or an efficient hull. All 285+ hp (HO) fords want to spin 4800 or so, 5k is fine. Above numbers are garbage. Tach or speedo is wrong (48mph @3800). |
Posted By: KENO
Date Posted: July-25-2016 at 8:43pm
No need to worry about me Rod I enjoy the water every day
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