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Author Topic: Camshafts 101  (Read 7809 times)

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Offline turbopinto72

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Camshafts 101
« on: September 24, 2004, 11:49:28 AM »
Although I dont profess to know everything about Cams I will share some basic info with the group to help better understand  just what you are reading in a cam spec.

Duration:
This is the amount of time, in cramshaft degrees that the valve is open. Most often , duration is expressed  as an " advertised" number, which, for purposes of comparing one cam to another is almost completely useless.

Duration at .050":
This is a know constant way of measuring duration. Unfortunately, some manifactures dont use it. The valve event is measured from .050" lift, on the opening ramp to .050" lift on the closing ramp of the cam lobe. If the cams you are considering using are measured this way, then you can directly compare one to another.

Lift:
simpley put, The amount that the valve is open in either inches or mm.

Lobe seperation:
The distance between the intake, and exhaust centerline in cam degrees.

What does a preformance cam do for me?

Duration.
Generally speaking, the duration will determine the useful RPM range of your engine. As duration is increased, the power band moves up in the RPM range. What you gain on one end, you lose on the other.

Lift.
Increasing the lift will almost always result in increased torque and horsepower. It has been said that lift= torque and horsepower.

lobe seperation.
Decreasing the lobe seperation ( moving the lobes closer to each other) will benefit low, and lower midrange torque and hoursepower, but create a rougher idle, and peakier torque curve. Increasing the lobe centerline will reduce overlap, broden the torque curve, provide a smoother idle and better top end power.

In the next section, Cams 102, I will attempt to provide you with a good selection of cam manufacturers, cam specs and what application the cams are good for.
Brad F
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Offline allfordmark

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Re: Camshafts 101
« Reply #1 on: September 29, 2004, 06:07:25 PM »
This looks like the information that will lead to "breathing" a little life into the 2.0 engine.  Yes??
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Offline sabray1

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Re: Camshafts 101
« Reply #2 on: November 22, 2004, 06:03:44 PM »
So where is section 2 on camshafts?????

Offline turbopinto72

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Re: Camshafts 101
« Reply #3 on: November 23, 2004, 10:53:00 AM »
coming soon.......... .. ;D
Brad F
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Offline bpanman

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Re: Camshafts 101
« Reply #4 on: March 01, 2005, 07:27:09 PM »
That is a good explantion on cams,  What would be good for quick hole shots, not really looking for top end but I want to be able to lite up the tires, I just cant get enough burnouts
 thanks, bpanman

Offline bpanman

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Re: Camshafts 101
« Reply #5 on: March 01, 2005, 07:29:38 PM »
Can a guy take his dremel and clean up the valve ports?  is it worth the time?
Thanks bpanman

Offline dirt track demon

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Re: Camshafts 101
« Reply #6 on: April 10, 2005, 10:50:35 PM »
Can a guy take his dremel and clean up the valve ports?  is it worth the time?
Thanks bpanman
  Yes, BUT and I mean BUT, Unless you really understand what you are doing here you would be better off letting a machine shop do this.  If you take too much out of one cyl and not enough out of the others, you will be asking how much for a new motor.  If you have access to a flow bench and someone who can explain it to you, you would be ok.  If you still want to try it, stick with just smoothing out the sharp edges and casting excess. And dont mess with the valve seat area. You wont notice any monster gains in performance, but it will rev a little smoother, and possibly gain a little in gas mileage.
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Offline mpintotoo

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Re: Camshafts 101
« Reply #7 on: April 13, 2005, 09:36:36 PM »
as for the 2.0 stock cam there 2 types
 1 has a green strip and the outher has a yellow strip
green 1 is a smog cam as the yellow 1 is the to get




















Offline turbopinto72

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Re: Camshafts 101
« Reply #8 on: August 23, 2005, 09:25:49 PM »
Cams part 2 is coming soon.......... ......stay tuned
Brad F
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Offline pmfman

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Re: Camshafts 101
« Reply #9 on: October 20, 2005, 07:32:19 PM »
thats nice but that still dosnt tell me what the duration is on a 2.3  :'(
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Offline turbopinto72

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Re: Camshafts 101
« Reply #10 on: October 23, 2005, 05:33:58 PM »
thats nice but that still dosnt tell me what the duration is on a 2.3  :'(

Your right and I still cant tell you becouse you have given me almost NO information as to what year etc.your Engine is. BTW this is a FAQ page. Please ask general questions in the " ask the expert" section.
Thanks
Brad F
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