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Thread: How to measure a camshaft

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Posts: 1-10 of 28
2012-08-02 03:39:41
#1
How to measure a camshaft
Hey guys,

I recently purchase some new cams and I want to make sure I have the right ones,

So I had these measures:



But I tried several ways but couldn't come to any useful measure

Can you give me a hand?
2012-08-02 03:41:27
#2
What cams did you get? Measure the high lobes in mm with some measuring calipers and i can tell you
2012-08-02 04:28:37
#3
They are supposed to be SR16VE cams, I measured 3.6 cms on the high lobes
2012-08-02 04:36:27
#4
Do you have a Green and Orange paint stripe on the cam?
Last edited by pTen on 2012-08-02 at 04-36-46.
2012-08-02 14:05:50
#5
Originally Posted by pTen
Do you have a Green and Orange paint stripe on the cam?


I believe they do, I'll check.

On the measure stuff, I have come with the following,

(Highest part of the lobe - lowest part of the lobe) x camshaft ratio

Is this correct?? If so, what's the camshaft ratio?
2012-08-02 15:45:16
#6
So the 20v cams are the best here?
2012-08-02 15:47:07
#7
Originally Posted by sugarwaterpurpl
So the 20v cams are the best here?


On NA, no. N1 ones are, take a look at the duration, not just the lift.
2012-08-02 16:09:02
#8
So less duration is better? Im still learning how to exactly read and understand the cams and the measurements.
More lift the better, less duration the better?
More lift meaning the valves go down further?
And duration is?
2012-08-02 16:29:32
#9
Originally Posted by sugarwaterpurpl
So less duration is better? Im still learning how to exactly read and understand the cams and the measurements.
More lift the better, less duration the better?
More lift meaning the valves go down further?
And duration is?






- Lift is the how MUCH the valves go over the combustion chamber (measured in millimeters)

- Duration is how LONG the valves stay open (measured in degrees, greater number means more time)

- There is also Overlap, which means how LONG both the intake and exhaust valves are open at the same time (also measured in degrees)


What I didn't know is that the measurements in the table I presented include the rocker arm ratio which adds up to the actual lift value.
Last edited by Nicoxis on 2012-08-02 at 16-30-21.
2012-08-02 17:03:59
#10
I see! Great diagram thank you! getting more of an understanding now
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