PROJECT
Don's Elan S4
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Camshafts reground to Dave Bean #112 specs; 0.385" lift and 300° duration seat-to-seat. |
Intake Ports smoothed, Exhaust Ports reshaped, Combustion Chambers polished and CC'd. |
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Special Shims are needed for reground Cams. A surface grinder is needed to adjust the thickness. |
The special Shims also need to be shortened to fit on the Valve Stem without touching the Keeper. |
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Setting up the Degree Wheel. An extension was needed to move the wheel away from the Water Pump. |
Calibrating Top Dead Center. |
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Setting the Lobe Centers. The Exhaust Cam needed a 2° offset dowel and the Intake a 1° offset dowel with a 0.040" thick Head Gasket. A 0.027" Head Gasket needed a 1° and a zero. |
Clay is used to check the Piston-to-Valve clearance. Measuring the cross section of the squished clay gives the clearance. |
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The Chassis Dyno will give the final verdict, but this should be a good start. A Sun 506 Distributor machine was used to produce "Don's Elan" curve. The Big Valve Dellorto and Stromberg (Domestic) curves are from Miles Wilkins' book (pages 168 & 169). |
Even though the Distributor is marked "12°" it required a bushing to limit it to 12 (24° crankshaft). Without the bushing it nearly had 20° of advance (40° crankshaft) ! |
Is YOUR Lotus ready for driving?
If not, call Don - 302-559-9374
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