Cam lobe positioning Whittle V8.

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Presentation transcript:

Cam lobe positioning Whittle V8

Firing order and engine rotation The given firing order by EW is: 1, 4, 3, 8, 7, 6, 5, 2. In order to fire every 90 degrees, the crank rotation must be anti-clock from front. Piston 1 at TDC in Cyl. 1 Piston 4 at TDC in Cyl. 4 1,3,5,7 2,4,6,8 1,2,7,8 3,4,5,6 7& 8 1& 2 Flat plane crank Front 5 & 6 3 & 4

Cam lobe position relative to Cylinder 1 The given firing order by EW is: 1, 4, 3, 8, 7, 6, 5, 2. This is a 90 degree V engine:- Even cylinder Pushrods meet the camshaft at 90 degrees to the Odd cylinder Pushrods! Piston 1 at TDC in Cyl. 1 Piston 4 at TDC in Cyl. 4 Pushrod on cam heels Pushrod on cam heels 45 deg. 1 4 Rotates to this position When Cyl. 4 is at TDC 1 4 90 deg. Crank rotates 90 degrees Anti-Clock to next firing position 1 4 Camshaft rotates at half speed, so 45 degrees and Clockwise to next firing position NB. Compare these two profiles with EW drawing for 1 and 4. They are the same!

Cam lobe position relative to Cylinder 1 The given firing order by EW is: 1, 4, 3, 8, 7, 6, 5, 2. Crank rotates 90 degrees Anti-Clock to next firing position Camshaft rotates at half speed, so 45 degrees and Clockwise to next firing position

Cam lobe positions relative to Cylinder 1 firing position All cams Rotated 45 degrees Clockwise for ease of comparison to EW drawing

Comparison to the original EW drawing For ease of comparison all cams have been Rotated 45 degrees clockwise. Now when we compare each cam to Eric Whittle’s drawing, we see they are identical!

Working the Firing order through The given firing order by EW is: 1, 4, 3, 8, 7, 6, 5, 2.

Working the Firing order through The given firing order by EW is: 1, 4, 3, 8, 7, 6, 5, 2.

Working the Firing order through The given firing order by EW is: 1, 4, 3, 8, 7, 6, 5, 2.

Working the Firing order through The given firing order by EW is: 1, 4, 3, 8, 7, 6, 5, 2.

Working the Firing order through The given firing order by EW is: 1, 4, 3, 8, 7, 6, 5, 2.

Working the Firing order through The given firing order by EW is: 1, 4, 3, 8, 7, 6, 5, 2.

Working the Firing order through The given firing order by EW is: 1, 4, 3, 8, 7, 6, 5, 2.

Working the Firing order through The given firing order by EW is: 1, 4, 3, 8, 7, 6, 5, 2.

Summary The given firing order by EW is: 1, 4, 3, 8, 7, 6, 5, 2. To meet this firing order, the engine rotation is Anti-Clockwise looking from the front. Camshaft rotation is Clockwise from the front. The Cam lobe positions shown on the original drawing are correct to meet the suggested firing order.