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  #1  
Old 09-08-2008, 06:10 PM
SVXMAN2001 SVXMAN2001 is offline
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stock camshaft specs

I am having a performance valve job done on my cylinder head and the machinist wants to know the specs of our stock camshafts. I did a little research on the network and there is A LOT of information on camshafts, in fact too much for a novice to be able to decifer what info i really need.

So that being said, what camshaft spec info will my machinist need to complete his job? I was planning on keeping the camshafts stock to avoid reliability issues and having to convert to solid buckets...now that i think about it, is it possible to obtain a more aggressive camshaft without sacrificing too much daily drivability? thanks in advance.
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Old 09-09-2008, 11:15 PM
oab_au oab_au is offline
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Re: stock camshaft specs

Quote:
Originally Posted by SVXMAN2001 View Post
I am having a performance valve job done on my cylinder head and the machinist wants to know the specs of our stock camshafts. I did a little research on the network and there is A LOT of information on camshafts, in fact too much for a novice to be able to decifer what info i really need.

So that being said, what camshaft spec info will my machinist need to complete his job? I was planning on keeping the camshafts stock to avoid reliability issues and having to convert to solid buckets...now that i think about it, is it possible to obtain a more aggressive camshaft without sacrificing too much daily drivability? thanks in advance.
Hi the standard valve timing is measured at 0.010"
Inlet opens 2*BTDC, closes 54* ABDC. Lift is 7mm.
Exhaust opens 55* BBDC, closes 9* ATDC. Lift is 8mm.

There is a cam that has been used before, welded and ground by Delta Cams. It was a modified Inlet cam that increased the lift to 8mm, with a 247* duration. It helped the torque to continue up the revs a bit further.

Harvey.
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Old 09-23-2008, 09:30 AM
SVXMAN2001 SVXMAN2001 is offline
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Re: stock camshaft specs

Harvey, could you please define the acroynms? (BTDC, ABDC, BBDC and ATDC). Thanks, Chris
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Old 09-23-2008, 09:42 AM
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RallyBob RallyBob is offline
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Re: stock camshaft specs

BTDC = Before Top Dead Center
ABDC = After Bottom Dead Center
BBDC = Before Bottom Dead Center
ATDC = After Top Dead Center
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Old 09-23-2008, 04:52 PM
oab_au oab_au is offline
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Re: stock camshaft specs

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Originally Posted by SVXMAN2001 View Post
Harvey, could you please define the acroynms? (BTDC, ABDC, BBDC and ATDC). Thanks, Chris
Hi Chris, Bob has the words right, but a picture saves a lot of words.


Blue is inlet duration.
Yellow is exhaust duration.
MOP. Is maximun valve opening point, or Lobe center.

Harvey.
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Old 09-23-2008, 07:11 PM
SVXMAN2001 SVXMAN2001 is offline
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Re: stock camshaft specs

thanks guys, I'll let pass the info onto my machine shop guy tomorrow!
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