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post #1 of 9 (permalink) Old 05-23-2010, 04:22 PM Thread Starter
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RPM Question

when idling at 1000 rpm, in a cobalt, is each cylinder doing 250 rpms or is each doing 1000? dumb question i know
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post #2 of 9 (permalink) Old 05-23-2010, 04:25 PM
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I'm not positive but I believe the crank is turning 1000 times per minute. not sure though
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post #3 of 9 (permalink) Old 05-23-2010, 05:07 PM
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^^ correct ^^

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post #4 of 9 (permalink) Old 05-23-2010, 06:38 PM
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Kind of neat. At 1,000 rpm the crank is spinning 1,000 times a minute or almost 17 times a second. Cruising down the interstate at say 2,500 rpm the crank is spinning almost 42 times every second.

It's really neat that people engineer such things when you really think about it.

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post #5 of 9 (permalink) Old 05-23-2010, 06:59 PM
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and this is why oil and bearings and coolant and all this stuff is so important! crankshaft turns 1000 times per minute at 1000rpm and the cams rotate half that speed. i think the balance shaft rotates the same speed as the crank.

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post #6 of 9 (permalink) Old 05-23-2010, 07:38 PM
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Quote:
Originally Posted by ff_drift_lol View Post
and this is why oil and bearings and coolant and all this stuff is so important! crankshaft turns 1000 times per minute at 1000rpm and the cams rotate half that speed. i think the balance shaft rotates the same speed as the crank.
Balance shafts run at twice the RPM. So if you're at 3,000RPM, the balance shafts are at 6,000 RPM.


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post #7 of 9 (permalink) Old 05-23-2010, 07:57 PM
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it is insane when you think about it
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post #8 of 9 (permalink) Old 05-23-2010, 08:55 PM
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If you guys think thats insane, the nitro engines I run are able to hit 55k RPM...

Since they are a large amount smaller, it is to be expected. The common rule is that the larger the displacement, the lower the peak RPM.

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post #9 of 9 (permalink) Old 05-23-2010, 08:58 PM
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insane in the engine brain
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