matching cam to heads?
Registered User
Joined: Aug 2002
Posts: 1,509
From: Red Oak Texas
I think most people say that meaning if you have a head that goes turbulent at .550 lift, get a cam smaller than .550 lift. In my opinion, you should get as much lift as you can (with in reason) and if the heads goes turbulent before that, get the porter to fix it.
If the port goes turbulent at any lift with in reason, you should have the porter keep that from happening. Could be the back cut on the valve, could need more shortturn work, etc. but what ever it is, fix it. A port that levels off or even loses 1-3 cfm at .600 lift is not the same as going turbulent.
The duration of the cam should be picked on the RPM you want your powerband to start/end at. The lobe seperation and ICL will affect this as well but I am guessing that your question was dealing with "lift" only.
NightTrain66
If the port goes turbulent at any lift with in reason, you should have the porter keep that from happening. Could be the back cut on the valve, could need more shortturn work, etc. but what ever it is, fix it. A port that levels off or even loses 1-3 cfm at .600 lift is not the same as going turbulent.
The duration of the cam should be picked on the RPM you want your powerband to start/end at. The lobe seperation and ICL will affect this as well but I am guessing that your question was dealing with "lift" only.
NightTrain66
Banned
Joined: Aug 2001
Posts: 3,505
From: looking for a flow bench so Brook and I can race
Originally posted by NightTrain66
I think most people say that meaning if you have a head that goes turbulent at .550 lift, get a cam smaller than .550 lift. In my opinion, you should get as much lift as you can (with in reason) and if the heads goes turbulent before that, get the porter to fix it.
If the port goes turbulent at any lift with in reason, you should have the porter keep that from happening. Could be the back cut on the valve, could need more shortturn work, etc. but what ever it is, fix it. A port that levels off or even loses 1-3 cfm at .600 lift is not the same as going turbulent.
The duration of the cam should be picked on the RPM you want your powerband to start/end at. The lobe seperation and ICL will affect this as well but I am guessing that your question was dealing with "lift" only.
NightTrain66
I think most people say that meaning if you have a head that goes turbulent at .550 lift, get a cam smaller than .550 lift. In my opinion, you should get as much lift as you can (with in reason) and if the heads goes turbulent before that, get the porter to fix it.
If the port goes turbulent at any lift with in reason, you should have the porter keep that from happening. Could be the back cut on the valve, could need more shortturn work, etc. but what ever it is, fix it. A port that levels off or even loses 1-3 cfm at .600 lift is not the same as going turbulent.
The duration of the cam should be picked on the RPM you want your powerband to start/end at. The lobe seperation and ICL will affect this as well but I am guessing that your question was dealing with "lift" only.
NightTrain66
Try reading the discussions on cams in advanced tech. I am follow most now without getting a migrane, but their wealth of knowlege never ceases to amaze me
thats why i just asked someone there to "design" a cam for me. trying to do it myself was killing me
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