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Converting revolution per thousand to hours
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A310 View Drop Down
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Joined: 30 Nov 2017
Location: Kelowna, Canada
Points: 105 		Post Options Post Options   Thanks (0) Thanks(0)   Quote A310 Quote  Post ReplyReply Direct Link To This Post Topic: Converting revolution per thousand to hours
    Posted: 24 Jan 2018 at 9:17pm
Hey guys and gals,

I'm in the process of restoring a 1965 Allis Chalmers FDX40-24 forklift with a Buda D175 diesel engine.  The hour meter is not hours but revolutions/thousands.  At the moment the unit has 215350 thousand revolutions.  Does anyone know if there is a table for this, my manual mentions a table but does not have one.  If I divide this number by 60 to get hours at 1000 rpm average I get 3589 hours on the engine.  Am I in the right ball park or missing something?  

Thanks

Harling

P.S.  First cold start and run up with coolant system restored:
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DiyDave View Drop Down
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Joined: 11 Sep 2009
Location: Gambrills, MD
Points: 50716 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DiyDave Quote  Post ReplyReply Direct Link To This Post Posted: 25 Jan 2018 at 4:53am
You're in the right ball park, but, it depends on what ave running rpm really is...Wink
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DMiller View Drop Down
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Joined: 14 Sep 2009
Location: Hermann, Mo
Points: 29783 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DMiller Quote  Post ReplyReply Direct Link To This Post Posted: 25 Jan 2018 at 6:28am
In engines the hours were determined for full power rpm usage. Slower rpm less hours accrued on a mechanical gauge. My 180 tach will tabulate hour to clock hour at roughly PTO rated speed as I have found, not full tach speed but pulling speed. Electronic meters just clock time running.

As a best guess for your machine, where the HP rated RPM is would be the hour to hour rate and without knowing where the tach drive or if is on a reducer gear as my 180 is off the back of the alternator there is not much standard to base on.
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A310 View Drop Down
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Joined: 30 Nov 2017
Location: Kelowna, Canada
Points: 105 		Post Options Post Options   Thanks (0) Thanks(0)   Quote A310 Quote  Post ReplyReply Direct Link To This Post Posted: 25 Jan 2018 at 9:05am
Ok thanks for the replies guys, I just thought it very odd to track time this way and thought there was a more accurate way to figure it out.  I'll run the unit and figure what average rpms I do and go from there.:)
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steve(ill) View Drop Down
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Joined: 11 Sep 2009
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Points: 78238 		Post Options Post Options   Thanks (1) Thanks(1)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 25 Jan 2018 at 7:41pm
I might guess the actual "average" rpm is more like 1500.
Like them all, but love the "B"s.
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A310 View Drop Down
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Joined: 30 Nov 2017
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Points: 105 		Post Options Post Options   Thanks (0) Thanks(0)   Quote A310 Quote  Post ReplyReply Direct Link To This Post Posted: 25 Jan 2018 at 8:36pm
Thanks.:)
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