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  #1  
Old 01-12-2010, 09:35 AM
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Have you considered installing an hour meter?

Have you considered an hour meter just to have another control variable in your car's maintenance? Will this particular device work on MB diesels?

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=360194620894&viewitem=

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Old 01-12-2010, 10:20 AM
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I had put one on my furnace, but this is an interesting thought.

Maybe I can get a Hobbs meter and put it in.
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Old 01-12-2010, 10:29 AM
Craig
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It would be easy enough to connect an engine hour meter to a power supply from the ignition switch. I'm not sure why it would be useful since most maintenance is based on miles and/or time.
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Old 01-12-2010, 10:52 AM
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Originally Posted by Craig View Post
It would be easy enough to connect an engine hour meter to a power supply from the ignition switch. I'm not sure why it would be useful since most maintenance is based on miles and/or time.
i suppose it would be helpful if the car tends to sit idling for a long time and you wanted to measure 'engine wear' time.

suppose it idles at 1000rpm for 3 hours. wouldn't that be the same as driving the car for 1 hour at 3000rpm?

if you traveled at 65 mph for that 1 hour, you would have travelled 65 miles.

therefore, 3 hours sitting in traffic = 65 miles in "engine wear" even though the odometer barely moved (you are stuck in traffic).

I the short run, i guess it is irrelevant but if you sit in traffic a lot, it could add up.
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Old 01-12-2010, 11:12 AM
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Originally Posted by benhogan View Post
suppose it idles at 1000rpm for 3 hours. wouldn't that be the same as driving the car for 1 hour at 3000rpm?
No.

The exhaust temperatures and thus how completely the fuel is combusted is different at different RPMs. More carbon buildup takes place at idle than when the exhaust is hotter.


I was thinking the same thing about your hour meter, it might be useful to a future purchaser to identify excessive idling and drop the price they may give you. Not to mention the price drop because its a modification.

If you idle your vehicle too much, you probably already know so and should alter your service intervals accordingly- why would you want a means by which to prove it to someone else?

EDIT: Just to be clear, you could leave it idling for DAYS and the exhaust gases would NEVER reach the temp they reach driving it a sustained 5-10 mins under load at 3000 rpm.
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Old 01-12-2010, 11:35 AM
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Originally Posted by Archdukeferd View Post
No.

The exhaust temperatures and thus how completely the fuel is combusted is different at different RPMs. More carbon buildup takes place at idle than when the exhaust is hotter.


I was thinking the same thing about your hour meter, it might be useful to a future purchaser to identify excessive idling and drop the price they may give you. Not to mention the price drop because its a modification.

If you idle your vehicle too much, you probably already know so and should alter your service intervals accordingly- why would you want a means by which to prove it to someone else?

EDIT: Just to be clear, you could leave it idling for DAYS and the exhaust gases would NEVER reach the temp they reach driving it a sustained 5-10 mins under load at 3000 rpm.
good point. thanks for clearing it up. i never considered the temperature issue at all. this forum rocks!
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Old 01-12-2010, 11:38 AM
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Quote:
Originally Posted by Craig View Post
I'm not sure why it would be useful since most maintenance is based on miles and/or time.
Isn't time precisely what an hour meter measures?
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Old 01-12-2010, 11:41 AM
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I understand (all) airplane engines use hours to schedule their maintenance.
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Old 01-12-2010, 11:47 AM
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Originally Posted by tangofox007 View Post
Isn't time precisely what an hour meter measures?
I wasn't clear, I meant "calendar" time (i.e., 6 months).
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Old 01-12-2010, 01:38 PM
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It's a wonder that MB doesn't have this type of gadget on them, all things considered. I'm wondering if they were ever installed on MBs - way back maybe?
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Old 01-12-2010, 01:42 PM
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My GPS has an hour meter. I find it surprising how long the engine is actually running compared to how for the car actually travels.
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Old 01-12-2010, 01:56 PM
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In the large engine business, service tasks are scheduled by running hours, indpendent of load. There is a trend, however, towards "Condition Based Maintenance" which is a fancy way of saying "If it isn't about to break or wear out, don't fix it."

Of course the tricky part is determining whether it's about to break or wear out!

Rgds,
Chris W.
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Old 01-12-2010, 03:15 PM
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Quote:
Originally Posted by Chris W. View Post
In the large engine business, service tasks are scheduled by running hours, indpendent of load. There is a trend, however, towards "Condition Based Maintenance" which is a fancy way of saying "If it isn't about to break or wear out, don't fix it."

Of course the tricky part is determining whether it's about to break or wear out!

Rgds,
Chris W.
Cars are moving that way too now. Factory manuals are starting to say "change the oil when the light comes on" instead of "Change the oil every ___ miles or ___ months." I'm not a fan, but it's the way the trend is going even in small engines as well.

For my vote, I'm nowhere close to concerned enough about it to want another instrument. I let mine idle plenty because carbon is easier to ignore than a starter or battery. My view is "no matter how many million times the starter works, it DOES have a finite number of cranks in it, so why waste them" if it's only going to sit ten or fifteen minutes.
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Old 01-12-2010, 04:50 PM
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I've never considered putting one in my own vehicle, since scheduling maintenance by mileage or calendar time seems adequate to me.

Some military trucks have hour meters in addition to odometers, and they idle A LOT. I've seen some where the mileage divided by the hours works out to an average speed of about 3 mph.
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Old 01-12-2010, 05:48 PM
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I work on utility equipment. They put one on the engine and one on the pto. Its just another way of knowing the conditions that the actual piece of equipment is being operated .

I find some mid 90's trucks with 20,000 miles on them then look at the hour meter and the brand new low mileage truck suddenly becomes a POS . It has Idled 8 hrs a day for the past 15 years !!

Some fleets go by hours others by odometer or months depends on the manager / owner .

All new vehicles have an internal Life hour meter I guess you could call it. Dealers can bring it up on their scanners.

Unless you have major problems with your odometer I wouldnt worry about it.

And we all know these mercedes have the most accurate odometers.

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