PROJECT
Don's Elan S4
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Ports "blueprinted", Combustion Chambers polished, Camshafts reground to Dave Bean #112 specs. |
Special Shims are needed for reground Cams. A surface grinder is needed to adjust the thickness. |
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The special Shims also need to be shortened to fit on the Valve Stem without touching the Keeper. |
Calibrating Top Dead Center. |
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Setting the Lobe Centers. The Exhaust Cam needed a two degree offset dowel and the Intake a one degree offset dowel. |
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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