Recent Topics
$14 5qt. QS 10w-40 syn blend + $5 GC - wallys
by lairdwd
Today at 09:06 PM
Synthetic from dino?
by S2K
Today at 08:35 PM
Voltage fluctuation 2012 Elantra
by schuylkill
Today at 08:28 PM
Tranfer Case 2016 GMC Sierra 1500 6.2 8 speed
by dareo
Today at 07:39 PM
Caliper slide pin questions
by ZZman
Today at 07:24 PM
Perfect Afternoon with F7Fs
by Yah-Tah-Hey
Today at 06:10 PM
Blending E85 to use as cleaner in non-FFV
by ltslimjim
Today at 05:33 PM
01 Tahoe instrument cluster replacement question
by mjk
Today at 05:25 PM
Reasonable price to pay some one to detail?
by Colt45ws
Today at 05:09 PM
FCA upheaval--Marchionne ill, Jeep CEO takes over
by Carmudgeon
Today at 04:42 PM
Duck Boat
by Zee09
Today at 04:23 PM
What are these valves and can I use them to...
by E150GT
Today at 04:06 PM
OBD Tool
by dawgn86
Today at 03:31 PM
Any experience with the new FA-4 oils?
by SubaJew
Today at 03:24 PM
What's the average life (in miles) of mc tires
by JeepWJ19
Today at 03:00 PM
Car Recommendation: haul an electric scooter
by brueggma1
Today at 02:54 PM
300ZX Starter replacement
by aquariuscsm
Today at 02:50 PM
Finally Let the HF/Greyhound Franken Mower Go
by javacontour
Today at 02:17 PM
You know its hot when...
by Chris142
Today at 02:09 PM
2015 Mazda 3 - Exhaust CAM Actuator Seal - HM Oil?
by buster
Today at 01:16 PM
Newest Members
ppreedom, krugger, jznwhite, S2K, tweak999
65524 Registered Users
Who's Online
61 registered (4WD, 2015_PSD, Astro14, ammolab, AZjeff, 8 invisible), 1352 Guests and 29 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
65524 Members
67 Forums
287437 Topics
4795166 Posts

Max Online: 3590 @ 01/24/17 08:07 PM
Donate to BITOG
Topic Options
#4708386 - 03/27/18 11:10 AM Belt Speed and RPM
MolaKule Offline


Registered: 06/05/02
Posts: 19138
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)

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


Registered: 06/28/03
Posts: 5821
Loc: 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

Top
#4708397 - 03/27/18 11:18 AM Re: Belt Speed and RPM [Re: MolaKule]
exranger06 Offline


Registered: 01/25/08
Posts: 3946
Loc: Guilford, CT
751.2 rpm.
_________________________
2006 Ford Ranger Sport
1992 Honda Accord EX
2004 Honda CR-V LX
1994 Ford Bronco XLT (project)
2011 Cadillac Escalade ESV (wife's)

Top
#4708423 - 03/27/18 11:45 AM Re: Belt Speed and RPM [Re: SHOZ]
MolaKule Offline


Registered: 06/05/02
Posts: 19138
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)

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


Registered: 01/25/08
Posts: 3946
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)
2011 Cadillac Escalade ESV (wife's)

Top
#4708459 - 03/27/18 12:37 PM Re: Belt Speed and RPM [Re: MolaKule]
MolaKule Offline


Registered: 06/05/02
Posts: 19138
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.

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


Registered: 06/28/03
Posts: 5821
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......
_________________________
2008 Hyundai Accent 1.6L 5 sp manual hatchback
2010 Hyundai Genesis Coupe Track 2L Turbo 6sp manual

Top
#4709028 - 03/27/18 10:01 PM Re: Belt Speed and RPM [Re: MolaKule]
Linctex Offline


Registered: 12/31/16
Posts: 6186
Loc: 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."

Top
#4709059 - 03/27/18 10:46 PM Re: Belt Speed and RPM [Re: MolaKule]
MolaKule Offline


Registered: 06/05/02
Posts: 19138
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)

Top