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Power to turn camshaft?

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Old 03-31-2011, 10:32 PM   #1
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Power to turn camshaft?

Does anyone know offhand how much engine power is required to turn the camshaft on, say, a 2.7 16-valve engine? Just something I got to wondering about, google didn't even turn up anything useful, maybe my search terms were off. Some engine person must know this, thanks in advance.
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Old 04-01-2011, 10:25 AM   #2
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1.1 kw per hr
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Old 04-01-2011, 10:27 AM   #3
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Never thought about something like this. The cam is probably easy to turn since it is on bearing but the valve springs would require the most energy to open.
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Old 04-01-2011, 08:16 PM   #4
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1.1 kw = about 1.5 hp, I would think it takes more than that. Yeah, it would be the valves opening that would require the power. I suppose the springs on the closing valves would give some boost to the rotation of the camshaft, maybe 1.5 hp would be enough, I have no idea.
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Old 04-01-2011, 08:20 PM   #5
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1.21 Gigawatts!!
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Old 04-01-2011, 10:32 PM   #6
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Quote:
Originally Posted by tacomunchkin View Post
1.21 Gigawatts!!
with a flux capacitor doing 88 miles per hr
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Old 04-02-2011, 03:08 AM   #7
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I would think the answer is that it does not take a lot of power/force for the engine to turn the camshaft.

A camshaft not attached to it's timing belt/chain is moveable by hand. I had to torque a camshaft bolt to 36 ft. lbs and had to secure the cam so that when I was tightening the bolt, the cam wouldn't just spin.

It shoudn't be difficult to put a ratchet & socket on the crankshaft bolt and be able to turn the engine over.

I dunno....get a beam type torque wrench and socket, put it on the crank bolt and see where the reading is at when the engine starts to turn over.
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