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How can I identify a cam ........
Posted by: Zodi Davis ()
Date: November 01, 2010 01:28PM

I purchased a LM recently that a P.O. had started a major engine O.H. In amongst the boxes of new parts is a new cam & gear. The only I.D. # on the nose is 493
When held along side a 270 the difference is obvious on lobe hieght. Both cams being new I measured the cam lobe at base circle first,Intake and exhaust 1.078 again from heel to top 1.372 . This is the 270. The unknown cams base circle is: Intake 1.201 exhaust 1.204 Hieght is 1.460 . Both cams appear to have the same lobe phasing when looked at from an end view. Can someone with a greater knowledge base help me figure this out?
Greg

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Re: How can I identify a cam ........
Posted by: nirvairna ()
Date: November 02, 2010 06:17AM

according to your measurements, the cam marked 493 is a lower lift cam than the 270

270 lift = 1.372 height - 1.078 base circle = .294 x 1.57 rocker = .461 lift at valve

493 lift = 1.460 height - 1.201 base circle = .259 x 1.57 rocker = .407 lift at valve



to determine duration and lobe centers it's easiest to setup the cam in a case with a crank - you need a cam wheel and a dial indicator

joe

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Re: How can I identify a cam ........
Posted by: 62corvairjunky ()
Date: November 02, 2010 08:37AM

Send it to me and I will test it for you.smiling smiley

I will tell you how it runs.ggg

Junky
Hurricane Utah.
Home of the "Red Desert Corvair Sanctuary."

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62 Rusty Rampy
62 wagon under construction.(Taking all my time and $$)
61 lakewood parts car.
61 Lakewood wagon project.
half a dozen parts cars n trucks or more.
20x40 garage full of greasy parts.

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Re: How can I identify a cam ........
Posted by: Zodi Davis ()
Date: November 02, 2010 08:56AM

Has anyone got a 260 cam they could measure for comparison?
Thank you guys!! Appreciate the replies! Greg

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Re: How can I identify a cam ........
Posted by: Andrew ()
Date: November 02, 2010 09:11AM


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