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Cam comparison A65
#784073 09/12/19 7:11 pm
Joined: Aug 2019
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I have an old cam and new cam from megacycle cam. I noticed the new cam on the right has a smaller profile where ive got the screwdriver bit leaned on. Im still waiting for the cases to come back from machine shop before assembly but is this normal or should i be concerned? Bonus points for explaining any of the numbers on timing card smile

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Re: Cam comparison A65
Walker22 #784075 09/12/19 7:12 pm
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sorry i really need to get this photo posting thing figured out....


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Re: Cam comparison A65
Walker22 #784076 09/12/19 7:15 pm
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A bit out of focus, no?

The right-side of the cam goes through 2 bushings, with a gap between them. Hence, two bearing surfaces with a gap in the section that isn't used.

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Re: Cam comparison A65
MarcB #784080 09/12/19 7:25 pm
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https://imgur.com/gallery/ZNbWogp

Thank you. My question is why is the profile smaller on the new cam on right?

Last edited by Walker22; 09/12/19 7:26 pm.

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Re: Cam comparison A65
Walker22 #784087 09/12/19 8:53 pm
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It's a gap for clearance, makes no difference so there is a very wide tolerance on it.

Re: Cam comparison A65
Walker22 #784144 09/13/19 12:45 pm
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Thanks Gents!


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Re: Cam comparison A65
Walker22 #784151 09/13/19 1:36 pm
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The numbers on the card tell when the cam will begin to open and finish closing your valves at degrees before or after top or bottom dead center of the piston. (ex: BTC = Before top center)
There's more info there but you and I will have to do our homework to understand it better.

Last edited by Nick H; 09/13/19 1:38 pm.

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Re: Cam comparison A65
Walker22 #784160 09/13/19 3:06 pm
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Need the beer goggles to read it. laughing


Now let’s all have a beer beerchug

68’ A65 Lightning “clubman”
71’ A65 823 Thunderbolt (undergoing restoration)
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Re: Cam comparison A65
Walker22 #784597 09/17/19 4:59 pm
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Use a photo Hosting site other than Photobucket. For me I use postimages.org.


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