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Belt Speed and RPM #4708386
03/27/18 10:10 AM
03/27/18 10:10 AM
Joined: Jun 2002
Posts: 19,620
Iowegia - USA
MolaKule Offline OP
MolaKule  Offline OP
Joined: Jun 2002
Posts: 19,620
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?




Last edited by MolaKule; 03/27/18 10:11 AM.

Scars remind us of where we have been, but do not have to dictate where we are going.
Re: Belt Speed and RPM [Re: MolaKule] #4708388
03/27/18 10:13 AM
03/27/18 10:13 AM
Joined: Jun 2003
Posts: 5,973
Illinois
SHOZ Offline
SHOZ  Offline
Joined: Jun 2003
Posts: 5,973
Illinois
Measure the circumference of the pulley. That many inches is one rpm compared to the belt linear distance


2008 Hyundai Accent 1.6L 5 sp manual hatchback
2010 Hyundai Genesis Coupe Track 2L Turbo 6sp manual
Re: Belt Speed and RPM [Re: MolaKule] #4708397
03/27/18 10:18 AM
03/27/18 10:18 AM
Joined: Jan 2008
Posts: 4,052
Guilford, CT
exranger06 Offline
exranger06  Offline
Joined: Jan 2008
Posts: 4,052
Guilford, CT
751.2 rpm.


2006 Ford Ranger Sport
1992 Honda Accord EX
2004 Honda CR-V LX - totaled
1994 Ford Bronco XLT (project)
2011 Cadillac Escalade ESV (wife's)
Re: Belt Speed and RPM [Re: SHOZ] #4708423
03/27/18 10:45 AM
03/27/18 10:45 AM
Joined: Jun 2002
Posts: 19,620
Iowegia - USA
MolaKule Offline OP
MolaKule  Offline OP
Joined: Jun 2002
Posts: 19,620
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?

Last edited by MolaKule; 03/27/18 10:46 AM.

Scars remind us of where we have been, but do not have to dictate where we are going.
Re: Belt Speed and RPM [Re: MolaKule] #4708441
03/27/18 11:09 AM
03/27/18 11:09 AM
Joined: Jan 2008
Posts: 4,052
Guilford, CT
exranger06 Offline
exranger06  Offline
Joined: Jan 2008
Posts: 4,052
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 - totaled
1994 Ford Bronco XLT (project)
2011 Cadillac Escalade ESV (wife's)
Re: Belt Speed and RPM [Re: MolaKule] #4708459
03/27/18 11:37 AM
03/27/18 11:37 AM
Joined: Jun 2002
Posts: 19,620
Iowegia - USA
MolaKule Offline OP
MolaKule  Offline OP
Joined: Jun 2002
Posts: 19,620
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.


Scars remind us of where we have been, but do not have to dictate where we are going.
Re: Belt Speed and RPM [Re: MolaKule] #4708710
03/27/18 04:40 PM
03/27/18 04:40 PM
Joined: Jun 2003
Posts: 5,973
Illinois
SHOZ Offline
SHOZ  Offline
Joined: Jun 2003
Posts: 5,973
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......


2008 Hyundai Accent 1.6L 5 sp manual hatchback
2010 Hyundai Genesis Coupe Track 2L Turbo 6sp manual
Re: Belt Speed and RPM [Re: MolaKule] #4709028
03/27/18 09:01 PM
03/27/18 09:01 PM
Joined: Dec 2016
Posts: 7,502
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 7,502
Waco, TX
I love these little "Practical" math problems you keep throwing out there!


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: Belt Speed and RPM [Re: MolaKule] #4709059
03/27/18 09:46 PM
03/27/18 09:46 PM
Joined: Jun 2002
Posts: 19,620
Iowegia - USA
MolaKule Offline OP
MolaKule  Offline OP
Joined: Jun 2002
Posts: 19,620
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



Last edited by MolaKule; 03/27/18 09:50 PM.

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