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Engine Hours to Car Miles Calculation

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Old 07-11-2007, 12:38 PM
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Default Engine Hours to Car Miles Calculation

My new automobile has an engine hour meter. In 2100 miles, I've logged 80 hours. This computes to 26.25 miles per engine hour. My 2006 Mercury 525efi failed at 112 hours. This would compute to 2940 automobile miles!!! I know this is a little off. This is another approach: my friend had 525SC's that he rebuilt at 660 hours. A few years ago, a big block Chevy could run about 100K miles before needing a re-build. So 660 in to 100K = 152 miles per engine hour. Even if I use this calculation, then my 525 made ot to the equivalent of 17,000 automobile miles! Has anyone calculated the boat engine hours to automobile miles equivalent before?
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Old 07-11-2007, 12:46 PM
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Its next to impossible to compare them side by side.....auto engine live between 1500 and maybe 3000rpm when crusing around.....marine engine live between 3000-5000+ sometimes when cruising...

So if you had your car doing 3000-5000rpms for that 80 hours you would have WAY more then 2100 miles!!

Ive heard plenty of times that in a marine motor its more like for every 100 hours of opperation is like 10-15k auto miles...
So for like 600 hours on the boat is like having between 60-90k miles on a car....
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Old 07-11-2007, 01:32 PM
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http://www.offshoreonly.com/forums/s...d.php?t=160411

search button is your friend To answer your question, Mercury told me that 1hour = 100miles
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Old 07-11-2007, 01:42 PM
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My new ride has the first engine hour meter I have owned in an auto, so it got me to thinking. I know there's no set formula, but was just curious to see the ranges. Lost both engines at 112 hours 4 weeks ago and am getting no assistance from Merc. or Corsa as to the cause/repair.
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Old 07-11-2007, 01:53 PM
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Tommy-
Have you spoken with Bobby or Donnie at Endeavour Marine about your engine failures? I seem to recall that they've had several engines with "problems" : had the Merc/Corsa combination.
Call Bob at 832-864-4000
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Old 07-11-2007, 02:05 PM
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More like: Boat hours = car hours at 100mph pulling a box trailer. I drive 100 miles each way to the Keys each weekend, and my engine turns 1600 rpms at 74 mph. How fast does your boat go at 1600?
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Old 07-11-2007, 02:18 PM
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I had my boat at Endeavor Marina for repairs, Bobby had to spend lots of hours going through Mercury to get my 496 HO running due to electrical problems. And he got them to cover under warranty, saved me some big bucks.

Bobby mentioned he has been seeing a lot of problems in the valve train on the 525's, the 496's are having electrical gremlins.
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Old 07-12-2007, 01:00 PM
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Merc does not surprise me- paying for the blue and thinking you are getting more than bling is absurd. My 575SCI lunched the sealed rotor brgs at 140 hrs- the service manual (the big thick engine specific $90 one) said nothing about servicing, replacing or ispecting them- they were way small /cheap grade bearings for the applicvation- shame on them (I'm an ME who's repaired jet engine partsa for 15 yrs)- nothing from merc racing.

I've used this an analogy which for my mode of operation (cruise mostly at 3500)....

Joe contractor buys a new big block dually fleet truck in say 1987 (no 4 speed auto) uses it to haul his hoe on the gooseneck trailer to jobs and that's it, always loaded, always screaming, often above 3000, even at "cruise". I used avg of 40 mph based on some gm onstar vehicles owned- do the math- marine engines should (and can) last a long time.

I hate to say it, but at 112 hrs, I'd get a good lawyer and be discussing "fit for merchantability". for the blue money you spend a 525 should go way more than 112 hrs. Have you scanned the ECU's? how much time at WFO vs mid rpm cruise and idle etc?
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Old 07-12-2007, 01:11 PM
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Quote:
Originally Posted by THLWL View Post
My new automobile has an engine hour meter. In 2100 miles, I've logged 80 hours. This computes to 26.25 miles per engine hour. My 2006 Mercury 525efi failed at 112 hours. This would compute to 2940 automobile miles!!! I know this is a little off. This is another approach: my friend had 525SC's that he rebuilt at 660 hours. A few years ago, a big block Chevy could run about 100K miles before needing a re-build. So 660 in to 100K = 152 miles per engine hour. Even if I use this calculation, then my 525 made ot to the equivalent of 17,000 automobile miles! Has anyone calculated the boat engine hours to automobile miles equivalent before?


BTW, what caused the motor to go at such low hours?



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Old 07-12-2007, 01:28 PM
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Darrell,

I have a couple of posts going on this (see General Tech Support where it starts out at "Corsa...)". Merc. says it was the "modified exhaust" (Corsa Capt. Call) and not their baby. Corsa says there is nothing in their exhaust causing this. Machine shop says valve stem to guide tolerance it too tight. 4 weeks later and I finally get tired of all the finger pointing and lack of acceptance of responsibility and proceed to (hopefully) repair the motors at my costs (for now). This is a big issue locally (2 other 525's are currently failed with similar symptoms which were built about 6 months before mine) and the local Merc. Rep. is of little help. I would think that Merc. would have flown in someone from the factory for these issues which are located about 1/2 mile apart.
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