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March 8th, 2008, 01:29 AM   #1
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how many rpm

how many rpm do you think a roller on the cam see's when the berg engine is flat out,

30,000 rpm?
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March 8th, 2008, 02:47 AM   #2
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RE: how many rpm

run a bearing around a cam lobe and fiond out? pick a starting point and count. i would say it does 2 to 1 of the cam so 20, 000rpm would be my guess.

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Taffy
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March 8th, 2008, 06:27 AM   #3
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that would be 10,000 then

if the berg crank is revving at 10,000

the cam is doing 5,000

if it is a two to one between the cam and roller , this would see the rollers doing 10,000 rpm.


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scrap
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March 8th, 2008, 07:09 AM   #4
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the cam to roller ratio is 0.6 to 1

so at 10,000 crank revolutions the roller is seeing around 8,000 rpm.

that is a lot less rpm than i first thought

very low for a small bearing.

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scrap
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March 8th, 2008, 10:50 AM   #5
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o dear was i a schmuk!!!!!!!

quite right fella! half engine speed comes first then my clever maths................

i will engage brain in the future!

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Taffy
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March 8th, 2008, 05:38 PM   #6
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how long do these rollers tend to last ?

i know it depends on what oil you use but as a generalization from best to worst


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scrap
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