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08-23-2016, 06:20 PM
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#1 |
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Old Sky Soldier
 Join Date: Dec 2011
Location: Kentucky
Posts: 3,881
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Speed vs Rpm
For a standard cc fe290 all stock. Is there a way to figure the rpm from the speed you are going? Lazy minds want to know.
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08-23-2016, 08:27 PM
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#2 |
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What the ....?
Join Date: Jan 2007
Location: N.E. Wisconsin
Posts: 14,928
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Re: Speed vs Rpm
There really isn't a way until you get used to the sound of the engine!
One tip I know of is, at top speed? your engine (without a rev limiter) will miss, and spit & sputter around 5100 rpms, that tells you that your valves are "floating" and that its best to let off the gas right away!  |
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08-23-2016, 09:01 PM
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#3 |
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Old Sky Soldier
Join Date: Dec 2011
Location: Kentucky
Posts: 3,881
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Re: Speed vs Rpm
Mine is running 23-25 mph, the engine sounds smooth and not straining. The rev limiter is unhooked, but when going down hill I can feel the gov slow it down. Just don't want to over do it.
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08-26-2016, 06:42 PM
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#4 |
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Getting Wild
Join Date: Jan 2015
Location: s e mo
Posts: 120
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I have 22 inch tires,when I am going 26 mph my tach reads 4400
Sent from my Lenovo TAB 2 A7-30F using Tapatalk |
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08-26-2016, 07:44 PM
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#5 |
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Old Sky Soldier
Join Date: Dec 2011
Location: Kentucky
Posts: 3,881
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Re: Speed vs Rpm
Thanks, that is just what I was wanting to know. I have 22 inch tires also. I must be hitting around 4000 rpm. To 4300
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08-27-2016, 03:08 PM
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#6 |
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Gone Wild
Join Date: Mar 2015
Location: Montville,Ohio
Posts: 177
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Re: Speed vs Rpm
You will know when it throws the rod outa the case. Oil has a tendency to migrate to the crankcase walls and stay there at high rpm,causing starvation of the rod big end. The oil will actually uncover the oil pump pickup. S.A.E. published a paper and made a video years ago and I was fortunate enough to view the video when I was a student at Denver Auto Diesel college in 1975/76. It was enlightening
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08-27-2016, 03:30 PM
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#7 |
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Not Yet Wild
Join Date: Mar 2012
Posts: 35
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Re: Speed vs Rpm
The little digital tach/hour meters are much cheaper than a rebiild.
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08-27-2016, 03:49 PM
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#8 |
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Old Sky Soldier
Join Date: Dec 2011
Location: Kentucky
Posts: 3,881
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Re: Speed vs Rpm
Years ago with the old oil before the 10,000 mile oil changes. I ran two 4 cylinder engines at 3600 rpm 8 hours on 8 hours off 24/7 for over a year. Changed oil once a week on each one. No oil filters. They will take more than the engineers think they will. Btw those engines never failed. They were replaced with larger Diesel engine units.
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08-27-2016, 07:36 PM
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#9 |
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Gone Wild
Join Date: Mar 2015
Location: Montville,Ohio
Posts: 177
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Re: Speed vs Rpm
Betcha they were water cooled too.....
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08-28-2016, 12:19 AM
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#10 |
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Old Sky Soldier
Join Date: Dec 2011
Location: Kentucky
Posts: 3,881
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Re: Speed vs Rpm
Nope, they were air cooled in 80-110f temps.
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