JoeMag

Anyone have recommendation of a 12V engine hour timer? ...something that when it see's 12V it times? I have msd ignitions with rpm switch and was going to put module on so it signals (times) above 3.4k or maybe 4k rpm.

Circuit Motorsports

http://www.pegasusautoracing.com/pro...asp?RecID=5519

This is the one I've had on a car in the past. Never any issues with it.

jpk

Check with a local lawnmower shop or a place like Northern tool:

http://www.northerntool.com/shop/too...-meters-gauges

J richard

Hobbs meters are the best bet, you can get them at graingers in the round dash housing or just the meter if you want to tuck it away...

http://www.grainger.com/Grainger/ite...Meters-_-2A644

Toby Pennycuff

I had a Hobbs meter integrated into my VDO tachometer. It's located at the bottom center right where the boost gauge is for a 930 turbo. The gauge is triggered by an oil pressure sensor when it reaches 10 pounds of pressure. This keeps the gauge from running when the ignition is the only thing that is on - in other words the setup is designed to provide a true representation of engine OPERATING hours. The Hobbs meter integration was done by North Hollywood Speedo and they did a GREAT job. I'll try to remember to take a picture and post this weekend.

MUSSBERGER

https://www.sendec-products.com/xcart/home.php?cat=249

Cory M

I just got a simple one from West Marine for my last racecar. If you have a data system like Motec or AIM you may be able to program it in...

911racer

Doesnt your dash do that. I know my mxl does. (have not figured out how to reset it yet) (or looked for that matter)

Ed

Geoffrey

I use one from ENM (Allied Electronics carries them) which is digital and resetable. Hook it to your fuel pump relay.

bgiere

Joe, running this one on the 944...easy to install, reliable.

http://www.yamaha-motor.com/waverunn.../0/detail.aspx

Phokaioglaukos

What do you think of this one? Runs on an internal battery and only counts when there is vibration, so leaving the ingnition on is not a problem and no need to plumb into an oil line for an oil pressure sensor to detect engine operation.

http://www.aircraftspruce.com/catalo...mhourmeter.php

Mahler9th

I wonder how reliable that would be in a car as far as the vibration on/off circuits. Probably pretty good if used in aviation.

In some ways it does not matter as long as it is consistent and the accumulated hours mean something to you.

I still prefer the set up that uses a Hobbs or similar that gets 12v or ground (you pick) from an rpm switch set at some rpm level you find meaningful. I rigged this up in my car 5-6 years ago. The rpm switch was a cheap generic from Summit and the set-point in my case is 3k rpm. Easy and cheap.

And consistent behavior in terms of on/off.

MUSSBERGER

We use to have those on our small equipment (rollers,compactors,pumps,generators,etc). Seemed to do the job.

Phokaioglaukos

Where did you pull the tach signal and where did you mount the hour meter?

Musche

The vibration activated ones will count when you are towing a car in/on a trailer and you won't want that. They start timing by cutting a jumper wire and will stop timing if the wire is reconnected either by a switch or normally closed relay.