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#283891 - 01/14/07 08:25 PM Hour Meter  
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F18lumpy Offline
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I have a Sendec hour meter that I have velcroed to a bulkhead in my engine compartment. I have about 30 hours of unrecorded engine time that I'd like to put on the hour meter so I have a more correct reading for my motor.

The Sendec measures electrical pulses in an ignition wire, so I can't trick it by leaving the ignition on. Anyone have any ideas how to fool this thing?

This is what I have in my boat.



Thanks
Jeff


Jeff
2005 Bayliner 195 Classic
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#283896 - 01/14/07 08:37 PM Re: Hour Meter [Re: F18lumpy]  
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kenhdog Offline
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Mine ran on 12v so I connected an old toy train transformer.

If yours works by inductance (wire wrap) not sure, but maybe installing it in your car for a few weeks of mileage is an idea.

Also depending on the sensitivity (current or voltage or voltage type AC of DC) you could probably 'try' it on any closed circuit power cord to see if it records/moves.


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#284009 - 01/15/07 08:40 AM Re: Hour Meter [Re: kenhdog]  
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Bondo Offline
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The Mouth of the Chaumont Rive...
Take a Crayon or Paint Pencil,+ Write (+30hrs) on the bulkhead next to the Meter........


Any Grease, Is Better than No Grease At All...
#284025 - 01/15/07 09:08 AM Re: Hour Meter [Re: Bondo]  
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Al Offline
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You would have to supply not only +12VDC to the unit, you would have to replicate the ignition pulses. There are a hundred ways to do this, but not too many that are easy and cheap.

Cheapest I can think of is this: Square wave oscillator, less than 9 bucks.

It looks to have 6 pulse rates, from 1hz to 100khz (so I would guess (1 10, 100, 1K, 10K, 100K). Say you use the 100 pulses per second range. Multiplied by 60, this is 6,000 pulses per minute. I am not an engine mechanic, but I think in a V8, there would be 4 pulses per revolution, so this would work out to 1,500RPM.

But who knows, the meter might respond to 100Khz, wihch means you would be done setting the hour meter a lot quicker.

It is possible that this kit would work without modification. However, I would not discount possibly having to modify it a bit to get it to work, either by changing the pulse-width duty cycle or having to increase the output current. This would likely be beyond the average joe.

For the average joe, it might just be easier to hook up a DC motor with a cam on it, then a microswitch on the cam. The microswitch would do the pulsing. My only concern would be if you could get the pulse rate high enough - i do not know if there is a "cut off" pulse rate on the electronic display or not.

I am sure the electronic display is a high impedance, so you would not have to worry about putting a capacitor across the microswitch to keep from burning out the contacts (like you would in a car), but it wouldn't hurt either.


President and CEO - Napmoor and Doolittle.


2004 Mercury 270 Dinghy.
2016 Grand Design Reflection 29RS 5th Wheel
2016 GMC Sierra 2500HD SLT 6.6L Diesel

previous boats:
1995 Carver 325
1999 Four Winns 268
1999 Four Winns 225
1996 Rinker 180
#284236 - 01/15/07 06:08 PM Re: Hour Meter [Re: Al]  
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Frantically Relaxing Offline
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Al--
since it's just an hourmeter, would it actually be measuring RPM? Seems to me that all it would do is detect ANY igntition pulses, simply to tell the meter that the engine is actually running? (meaning, the meter will just tick off 'normal' time regardless of pulse rate?)

#284411 - 01/16/07 08:14 AM Re: Hour Meter [Re: Frantically Relaxing]  
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Dave R Offline
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It only turns "on" when there are pulses present. FR's post above is correct. It does not need 12 volts to work.

Try wrapping 25 feet of wire around an extension cord with a load on it, connect it as the sensor wire, and see if it can pick up enough voltage through induction to turn on. I bet it will. Leave it like that for 30 hours.


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#284454 - 01/16/07 10:54 AM Re: Hour Meter [Re: Dave R]  
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nyminute Offline
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Bondo has the best idea, use an erasable marker, it will be handy come selling time unless yours has a computerized recording of hours.


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#284535 - 01/16/07 04:15 PM Re: Hour Meter [Re: nyminute]  
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Al Offline
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You are probably correct FR, but I thought it said RPM/Hour meter.

My other thought is that there may be a certain low threshold RPM that it might not register.

But sometimes I cannot see the forest for the trees.... (the think tank has run amok on occasion)


President and CEO - Napmoor and Doolittle.


2004 Mercury 270 Dinghy.
2016 Grand Design Reflection 29RS 5th Wheel
2016 GMC Sierra 2500HD SLT 6.6L Diesel

previous boats:
1995 Carver 325
1999 Four Winns 268
1999 Four Winns 225
1996 Rinker 180
#284572 - 01/16/07 06:59 PM Re: Hour Meter [Re: Al]  
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F18lumpy Offline
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Boston, MA
Sounds like some great ideas. I like the wire around the extension cord idea. Low tech and simple to implement.

Thanks
Jeff


Jeff
2005 Bayliner 195 Classic
#284672 - 01/17/07 10:29 AM Re: Hour Meter [Re: F18lumpy]  
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WayWeGo Offline
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Why don't you hook it up to your car for a week or two? When the hour meter shows the correct number, move it to the boat.



1975 Trojan F36 Convertible, Twin Chrysler 440's
2014 West Marine AL360 Inflatable, 1966 Mercury 6HP, 1992 Mercury 20HP
#285374 - 01/19/07 04:55 PM Re: Hour Meter [Re: WayWeGo]  
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Frantically Relaxing Offline
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Dave--wouldn't it need some voltage to at least run the LCD display and the internal clock?

#285485 - 01/20/07 09:09 AM Re: Hour Meter [Re: Frantically Relaxing]  
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Dave R Offline
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 Originally Posted By: Frantically Relaxing
Dave--wouldn't it need some voltage to at least run the LCD display and the internal clock?


Nope, I have one on my boat. It is powered by the induced electrical pulses that turn it on when the boat is running. It's a really slick idea. It also looks factory sitting on my engine's big intake cover.


"Mischief Managed"
2000 Regal 2550 LSC
7.4 MPI Bravo 3
#285503 - 01/20/07 10:30 AM Re: Hour Meter [Re: Dave R]  
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F18lumpy Offline
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Boston, MA
There's also a small battery inside the unit that preserves the hours and powers the display. The hours are always showing, just like the picture I included above. That allows you to see the hours w/o actually starting the motor.

Dave, I like your idea of attaching it to the motor. I have to duck around a bit to see mine due to where I have it located.

Thanks for the ideas.
Jeff


Jeff
2005 Bayliner 195 Classic
#285827 - 01/21/07 07:19 PM Re: Hour Meter [Re: F18lumpy]  
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F18lumpy Offline
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Boston, MA
Well, I tried to do the wire wrap around an extension cord and a couple of lamps with no luck. The hour meter would work only if I continuously flipped the lamps on and off. I have better things to do then spend 30 hours flipping a light switch. :-)

Instead, I chose to put in my Mercedes like Kenhdog suggested. I've added an hour to it already.

Thanks
Jeff


Jeff
2005 Bayliner 195 Classic
#285847 - 01/21/07 09:22 PM Re: Hour Meter [Re: F18lumpy]  
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kenhdog Offline
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Hey! Do you have a flashing Christmas light set, or a regular set that you could add a flashing bulb?

That might serve the off and on pulse, but depending on the frequency of the flash, might take weeks to register 30hrs...

Maybe once you get the car to within 3-5 hours of the 30hr goal then switch...


2002 Rinker 212 Captiva
Merc 5.7 EFI Alpha
Trail-Rite Trailer
1999 GMC 'Burb
#285857 - 01/21/07 10:07 PM Re: Hour Meter [Re: kenhdog]  
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F18lumpy Offline
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Boston, MA
Thats another great idea Ken. With my driving habits, a tank of gas usually equates to 24 hours of engine time, so it could take close to a month or so to get the hour meter where I want it.

Jeff


Jeff
2005 Bayliner 195 Classic
#292120 - 02/14/07 05:04 PM Re: Hour Meter [Re: F18lumpy]  
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LS14ME2 Offline
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I would just hook it up to one of your cars and run it until you reach the desired hours...
I have the exact meter but I have the 12V unit...

Oops....Just saw the post above...doing this already...

Chris..


2004 Bayliner 205..5.0 220HP,A1..
Tow rig 2003 F250 Lariat Crew Cab,7.3 PSD,4x4
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#292264 - 02/15/07 09:58 AM Re: Hour Meter [Re: LS14ME2]  
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F18lumpy Offline
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Boston, MA
Only 6 hours left to go!

Jeff


Jeff
2005 Bayliner 195 Classic

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