How to measure lift on cam ?
Thread Starter
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Joined: Mar 2005
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From: saudi arabia
How to measure lift on cam ? Does anyone knows how to measure the lift on a cam for lt1 ?
I dont know the cam specs on my car , I need to measure lift , in order to install springs that match !!
I googled it and got little confused.
I dont know the cam specs on my car , I need to measure lift , in order to install springs that match !!
I googled it and got little confused.
Registered User
Joined: May 2011
Posts: 6
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From: Houston, TX
Do you have a set of dial calipers? If so, measure from bottom of base circle to the top of the lobe, then measure the base circle width. Subtract your base circle measurement from your overall lobe measurement and it will give you lift. Hope this helps.
If the cam is in the car install a lifter and use a dial indicator to measure lift. Note that you must make sure the lifter follows the cam and doesn't stick in the upward position even though at that point you should have the lobe lift. Then multiply by the rocker ratio.
Registered User
Joined: May 2011
Posts: 6
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From: Houston, TX
If the cam is in the car install a lifter and use a dial indicator to measure lift. Note that you must make sure the lifter follows the cam and doesn't stick in the upward position even though at that point you should have the lobe lift. Then multiply by the rocker ratio.
Thread Starter
TECH Regular
Joined: Mar 2005
Posts: 426
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From: saudi arabia
If the cam is in the car install a lifter and use a dial indicator to measure lift. Note that you must make sure the lifter follows the cam and doesn't stick in the upward position even though at that point you should have the lobe lift. Then multiply by the rocker ratio.
Registered User
Joined: May 2011
Posts: 6
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From: Houston, TX
You never specified lobe lift or valve lift in the original post.
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Verdad Gallardo You multiply the lobe lift times the rocker ratio to determine how much the valve will move. What I meant with the lifter is you need something that moves with the cam for the measurement. Usually the lifter is the best method to do this. The dial indicator would be very hard to set up to measure directly from the cam.
Do you know what cam is installed in the car?
Do you know what cam is installed in the car?
One other option, since you are planning to change springs, get a set of light check springs and install them. Then roll the motor over by hand with a dial indicator on the valve spring retainer. You can get your lift that way as well if you have the tools. While check springs are available from Summit or other parts places, they are no more then just very light springs around the same diameter as a valve spring. Since your location may cause delays in obtaining a set, you might be able to look local for springs that will do the job.
