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#4708386 - 03/27/18 11:10 AM Belt Speed and RPM
MolaKule Offline


Registered: 06/05/02
Posts: 18945
Loc: Iowegia - USA
I find that the linear velocity of my main drive belt (grooved drive belt) on my Frontier is 236 in/sec.

The main crankshaft (drive) pulley is 6" in Diameter.

What is the RPM of the engine under these conditions?





Edited by MolaKule (03/27/18 11:11 AM)
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Hatito Hakiwisilaasamamo Waswasimamo Howisiwapani - Shawnee for: "Hello," "Good Morning," and "here's hoping you feel good." smile

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#4708388 - 03/27/18 11:13 AM Re: Belt Speed and RPM [Re: MolaKule]
SHOZ Offline


Registered: 06/28/03
Posts: 5603
Loc: Illinois
Measure the circumference of the pulley. That many inches is one rpm compared to the belt linear distance
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#4708397 - 03/27/18 11:18 AM Re: Belt Speed and RPM [Re: MolaKule]
exranger06 Offline


Registered: 01/25/08
Posts: 3847
Loc: Guilford, CT
751.2 rpm.
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#4708423 - 03/27/18 11:45 AM Re: Belt Speed and RPM [Re: SHOZ]
MolaKule Offline


Registered: 06/05/02
Posts: 18945
Loc: Iowegia - USA
Originally Posted By: SHOZ
Measure the circumference of the pulley. That many inches is one rpm compared to the belt linear distance


smile

Ok, but can you show us your calculations on what the rpm should be?


Edited by MolaKule (03/27/18 11:46 AM)
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Hatito Hakiwisilaasamamo Waswasimamo Howisiwapani - Shawnee for: "Hello," "Good Morning," and "here's hoping you feel good." smile

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#4708441 - 03/27/18 12:09 PM Re: Belt Speed and RPM [Re: MolaKule]
exranger06 Offline


Registered: 01/25/08
Posts: 3847
Loc: Guilford, CT
6 inch pulley times pi = 18.85 inches circumference.
236 in/sec divided by 18.85 inches = 12.52 revolutions per second
12.52 rps times 60 seconds = 751.2 rpm
_________________________
2006 Ford Ranger Sport
1992 Honda Accord EX
2004 Honda CR-V LX
1994 Ford Bronco XLT (project)
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#4708459 - 03/27/18 12:37 PM Re: Belt Speed and RPM [Re: MolaKule]
MolaKule Offline


Registered: 06/05/02
Posts: 18945
Loc: Iowegia - USA
Anyone else, Anyone Else?

https://www.youtube.com/watch?v=uhiCFdWeQfA

We'll wait for some more answers after the Supper crowd has been served.
_________________________
Hatito Hakiwisilaasamamo Waswasimamo Howisiwapani - Shawnee for: "Hello," "Good Morning," and "here's hoping you feel good." smile

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#4708706 - 03/27/18 05:38 PM Re: Belt Speed and RPM [Re: MolaKule]
Y_K Offline


Registered: 05/29/09
Posts: 2089
Loc: WA (USA)
That's all American high school system can produce?

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#4708710 - 03/27/18 05:40 PM Re: Belt Speed and RPM [Re: MolaKule]
SHOZ Offline


Registered: 06/28/03
Posts: 5603
Loc: Illinois
Originally Posted By: MolaKule
Originally Posted By: SHOZ
Measure the circumference of the pulley. That many inches is one rpm compared to the belt linear distance


smile

Ok, but can you show us your calculations on what the rpm should be?
I thought this was a class room thing and I just gave the start......
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#4709028 - 03/27/18 10:01 PM Re: Belt Speed and RPM [Re: MolaKule]
Linctex Offline


Registered: 12/31/16
Posts: 5714
Loc: Waco, TX
I love these little "Practical" math problems you keep throwing out there!
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#4709059 - 03/27/18 10:46 PM Re: Belt Speed and RPM [Re: MolaKule]
MolaKule Offline


Registered: 06/05/02
Posts: 18945
Loc: Iowegia - USA
This exercise was similar to

https://www.bobistheoilguy.com/forums/ub...ity#Post4707793

With Vt being given in this case, you had to work backwards to find the radians/sec and then convert to RPM.

In this case the RPM was ~ 720 RPM so my Frontier's engine was idling.


exrang06 provided a direct approach and correct answer so he receives the BITOG virtual Coffee Cup. happy




Edited by MolaKule (03/27/18 10:50 PM)
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