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Peak Piston Speed?

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Old Mar 29, 2008 | 09:39 AM
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Default Peak Piston Speed?
Is there anyone out there with a formula for peak piston speed? I've searched and searched, speedtalk and eng-tips even.
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Old Mar 29, 2008 | 09:53 AM
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Originally Posted by KCS
Is there anyone out there with a formula for peak piston speed? I've searched and searched, speedtalk and eng-tips even.
lots of threads here about this topic... do a search.. Here are a few

(I went to "seach this forum" button and typed in "Piston speed")

https://ls1tech.com/forums/showthrea...t=speed+piston

https://ls1tech.com/forums/showthrea...t=speed+piston

https://ls1tech.com/forums/showthrea...t=speed+piston
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Old Mar 29, 2008 | 06:33 PM
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Originally Posted by DanO
lots of threads here about this topic... do a search.. Here are a few

(I went to "seach this forum" button and typed in "Piston speed")

https://ls1tech.com/forums/showthrea...t=speed+piston

https://ls1tech.com/forums/showthrea...t=speed+piston

https://ls1tech.com/forums/showthrea...t=speed+piston
I appreciate the help, but I still don't see what I was looking for. Those links you provided spoke mainly of mean, or average, piston speed. I am looking for peak piston speed which I know involves somewhat complex algorithms. Thats what I am looking for.

The second link does contain an online calculator, which will have to do for now I guess.

Thanks though,
Kent
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Old Mar 29, 2008 | 10:55 PM
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I'm not familiar with a formula for 'peak piston speed'. Piston speed is a variable number based on RPM and stroke. Here's the formula for Piston Speed in feet/minute.

Piston Speed (FPM)= (2 x Stroke (inches) x RPM) / 12

or

Piston Speed (FPM)= (Stroke (inches) x RPM) / 6

Could you be looking for Piston G's @ TDC?
Last edited by 405HP_Z06; Mar 30, 2008 at 01:23 PM.
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Old Mar 30, 2008 | 12:05 AM
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Originally Posted by KCS
Is there anyone out there with a formula for peak piston speed? I've searched and searched, speedtalk and eng-tips even.
Kent the speed talk deal had one with peak piston speed. You need to know rod length and stroke and rpm but it is usually around 70-78 degrees ATDC.

A 4 inch stroke and 6.125 rod have a Max / Mean Ratio of 1.65 so at 4000 FPM Mean piston speed you have a peak of 6600 FPM instantaneous piston speed. This is around 75 degrees ATDC again.
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Old Mar 30, 2008 | 03:29 AM
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Okay, I understand what your looking for. Does this spreadsheet calculate what your looking for?
Spreadsheet
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Old Mar 30, 2008 | 07:19 AM
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I have the formula, its not that easy to type here with sin's and cosine.. Not sure what the best way to share it is...

If you can find a formula for piston position just take the derivative of it.. thats what I did
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Old Apr 1, 2008 | 09:51 AM
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dont know if this helps, but.. stroke x RPM/ 6= average piston speed of feet per minute
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Old Apr 1, 2008 | 10:05 AM
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Originally Posted by 383jake
dont know if this helps, but.. stroke x RPM/ 6= average piston speed of feet per minute
See post #4
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Old Apr 1, 2008 | 11:19 AM
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Originally Posted by 405HP_Z06
See post #4
i see it now... my bad
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Old Apr 1, 2008 | 12:59 PM
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Originally Posted by racer7088
Kent the speed talk deal had one with peak piston speed. You need to know rod length and stroke and rpm but it is usually around 70-78 degrees ATDC.

A 4 inch stroke and 6.125 rod have a Max / Mean Ratio of 1.65 so at 4000 FPM Mean piston speed you have a peak of 6600 FPM instantaneous piston speed. This is around 75 degrees ATDC again.
I calculate the peak piston speed to occur at 72 degrees for the parameters above. Trying to figure out what I did wrong, how did you arrive at 75 degrees?
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Old Apr 1, 2008 | 01:00 PM
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Originally Posted by 383jake
i see it now... my bad
No bad, it's all good.
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Old Apr 1, 2008 | 05:20 PM
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Originally Posted by 405HP_Z06
I calculate the peak piston speed to occur at 72 degrees for the parameters above. Trying to figure out what I did wrong, how did you arrive at 75 degrees?
405HP,

You are going to be right as that sheet I saw was only in 5 degree increments so you are closer and are probably right as well!
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Old Apr 2, 2008 | 07:23 AM
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Originally Posted by 405HP_Z06
Okay, I understand what your looking for. Does this spreadsheet calculate what your looking for?
Spreadsheet
Yeah, pretty much except I would like to know the actual formula before I have to rely on a spreadsheet. Thanks for the link though.
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Old Apr 2, 2008 | 07:47 AM
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Originally Posted by KCS
Yeah, pretty much except I would like to know the actual formula before I have to rely on a spreadsheet. Thanks for the link though.
Here is a link that provides what your looking for. He designed the spreadsheet I posted earlier.

http://www.wfu.edu/~rollins/piston/
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Old Apr 3, 2008 | 09:56 PM
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Originally Posted by racer7088
405HP,

You are going to be right as that sheet I saw was only in 5 degree increments so you are closer and are probably right as well!
Correction , I figured it wrong initially. It should be 73 degrees instead of 72 degrees.
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Old Apr 27, 2008 | 04:56 AM
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http://www.csgnetwork.com/pistonspeedcalc.html
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