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06-24-2011, 09:36 PM
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#1 |
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Intake Center Line
My question is if your intake center line is set at 108 and should be 102 would you have less clearance piston to valve? I think we found our problem being down on power. I now am worried about clearance. Should I be?
Thanks to all of you for helping. 
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06-24-2011, 09:44 PM
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Re: Intake Center Line
Your intake valve would have more clearance at 108 than 102.
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Ed Wright 4156 SS/JA |
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06-24-2011, 09:54 PM
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Re: Intake Center Line
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Bob Bender 144 O/SA 2010-2012 National Record Holder |
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06-24-2011, 10:54 PM
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Re: Intake Center Line
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68 Chevy11 327 F/S |
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06-24-2011, 11:56 PM
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Re: Intake Center Line
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06-25-2011, 12:55 AM
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Re: Intake Center Line
If you are now moving your intake center line to 102 from 108, to correct your problem, you will decrease intake valve to piston clearance.
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Alan Roehrich 212A G/S |
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06-25-2011, 08:50 AM
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Re: Intake Center Line
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Ed Wright 4156 SS/JA |
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06-25-2011, 11:00 PM
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#8 |
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Re: Intake Center Line
Advancing the cam decreases the intake piston to valve clearance and increases the exhaust piston to valve clearance.Retarding the cam that much increases the intake piston to valve clearance,and decreases the exhaust valve piston to valve clearance. Also, advancing the cam increases torque and reduces peak horsepower.Retarding the cam decreases torque and increases peak horsepower.Wouldn't it be great to be able to use a variable cam timing device that allows you to leave the line in at 98,and cross the finish line in at 108?Also, the weight of your car can affect where the engine wants the cam. My K/SA 68 Chevelle hardtop might just want it somewhere else than my O/SA 68 Chevelle wagon.Those two cars weigh 490 pounds different.
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06-26-2011, 06:59 AM
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#9 |
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Re: Intake Center Line
I don't know your application but you may want to invest a couple of minutes and leak the engine before a trip back to the track. In a minimum valve clearance built engine running the cam 6ยบ retarded from the checking centerline will reduce exhaust piston to valve clearance beyond the safety margin and the piston may wind up closing the valve. It may not apply to you but it's just a thought.
Last edited by Jim B; 06-26-2011 at 07:09 AM. |
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