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Introduction to Camshaft Specification Graphs

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Lake Speed's Ford C3 NASCAR Engine: NEW Comp Cam! 20+ Year Old Camshaft Specs vs Current Technology

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What happens here

The video opens with an overview of a camshaft specification graph. Billy Goodbold, a 'Camshaft Design Legend' from COMP Cams, is introduced, setting the stage for an in-depth technical discussion. He emphasizes that this type of chart is crucial for understanding how a camshaft will influence an engine's performance characteristics. The graph displays intake and exhaust lobe lift profiles across 720 degrees of crankshaft rotation, with numbers representing valve lift in inches on the Y-axis and crankshaft degrees on the X-axis.

Goal: Understand the basic layout and purpose of a camshaft specification graph.

Tools and materials

  • Camshaft Specification Graph N/A — Visual representation of valve lift profiles over crankshaft rotation
  • Pen — Pointing to specific areas on the graph for explanation

What they say

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how can I look at this chart and find out how hard it's going to thump you can't look at that chart and that's the best chart to look at to know what a camshaft is going to sound like jump the shark up here you get Evil Knievel Caesar's Palace Landing down here you call that valve bounce and it's really bad so what are we looking at here all right so these are the two camshafts so you can see the original camshafts in blue so that's that's the 4312 intake load that's an RX intake load a 4270 exhaust load that's a RZ exhaust load so this was probably one of the most successful early designs that I ever had a part of so if you go back to this early 2000 era a cam like this you know 165 rocker on the intake one five on the exhaust 108 lobe separation with those lobes that would be really kind of the

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