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Old 09-09-2005, 11:18 PM
Jacks 1977 Corvette
 
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finding the lift on my cam by using a dial indicator?

Somewhere in the past, I heard where you can find out the lift on your cam by using a dial indicator and said you will need a magnetic base to mount to the engine?

Any truth to this? If so, exactly how is this done step by step? I'd like to find out what lift my cam is since I've misplaced my engine paperwork when I moved to WA from OR 7 years ago.

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Old 09-09-2005, 11:26 PM
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Find a spot for the dial indicator to sit. On head measure pushrod movement or in lifter valley measure lifter movement. Set dial indicator to "0" on bottom of cam base circle. Turn motor over by hand and get highest reading from lifter or pushrod. This will give you cam lift. Multiply by rocker arm ratio for valve lift. For example. If you get reading of .318 on the pushrod with a 1.5 rocker, you have .477 lift. Which could be a Comp XE268H.

Measuring duration accurately would require a degree wheel.
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Old 09-09-2005, 11:49 PM
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Finding Lift Of You Cam

You Take Your Dial Indicator Place It On Your Lifter If Have An Exstention Or Place On Your Retainer,roll The Motor On Top Dead Center, If Your Camshaft Has Not Been Advanced Or Retarded, If So Turn It Over Till Both Intake And Exhaust Are At The At The Highest Point( Intake And Exhaust Are Both Closed) Zero In You Idicator On Retainer And Watch How Many Thousands It Goes Down, Stop When The Valve Is At It's Full Lift And Record How Many Thousands It Goes Down , Then Multiply It By Your Rocker Arm Ratio And You Got Your Lift At The Valve!

Example: .300x1.5=.450 Lift
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Old 09-10-2005, 07:51 AM
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When I did mine I put the dial on the pushrod side of the rocker to get cam lift and on the top of the spring to get valve lift. One thing that I did notice was they were not all the same. They would vary a few thousands from one lobe to the next (and I am comparing intakes to intakes and exhausts to exhausts as my intake has about .030 more lift). Probably wear from the 4 years its been in there. It would be interesting to check a new cam on the bench and see how close all the lobes are.
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Old 09-10-2005, 08:17 AM
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my lobes were exact when i checked mine new. i think when i measured through the lenth checking pushrod i lost a thousandths.
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Old 09-10-2005, 08:39 AM
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Your lifters are slowly bleeding down as you do this thats why the readings are varying.
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Old 09-10-2005, 01:10 PM
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Quote:
Originally Posted by bracketeer
Measuring duration accurately would require a degree wheel.
Can someone explain how this is done too?
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Old 09-10-2005, 07:56 PM
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Okay, now that I know how to measure lift, how would you measure duration?
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Old 09-11-2005, 03:13 AM
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http://www.cranecams.com/?show=article&id=3

Use these procedures and a tablet to write all the info down every few degrees. Then input the info into a cam program, or just take the basics...duration @ .050, centerlines, and lift.

Trying to do that now, but Autozone doesn't carry degree wheel kits for rent.
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Old 09-11-2005, 08:14 AM
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if you are that far in to it you'd be better off pulling the cam out and calling the cam company.have the cam in your hand at the time and they will tell you what they need from it.that way theres no room for error.you pay for the call but you know about your came and its worth it.actually some cams have enough info on them for you to find out on your own but it has to be out.good luck
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Old 09-11-2005, 08:26 PM
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Where is this info usually located on the cam?
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Old 09-11-2005, 08:33 PM
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The cam part # and/or grind # is found on the distributor end of the cam.
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Old 09-12-2005, 08:14 AM
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some cams are more identifieable than others and don't always have the grind info on them which is why i said to have the cam in your hand when you call the manufacturer so you can aswer any question they may ask you about the cam.anything you can remember from original purchase is helpful also.good luck.
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Old 09-13-2005, 03:16 PM
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The only number I get from mine is 200209. That's it. No other numbers. The cam came in the car when I got it, and the guy didn't know where it came from.

Any guesses?
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