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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. Front 1& 2 7& 8 3 & 45 & 6.

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Presentation on theme: "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. Front 1& 2 7& 8 3 & 45 & 6."— Presentation transcript:

1 Cam lobe positioning Whittle V8

2 Firing order and engine rotation The given firing order by EW is: 1, 4, 3, 8, 7, 6, 5, 2. Front 1& 2 7& 8 3 & 45 & 6 Flat plane crank 1,2,7,8 3,4,5,6 1,3,5,7 2,4,6,8 Piston 1 at TDC in Cyl. 1Piston 4 at TDC in Cyl. 4 In order to fire every 90 degrees, the crank rotation must be anti-clock from front.

3 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! Crank rotates 90 degrees Anti-Clock to next firing position Camshaft rotates at half speed, so 45 degrees and Clockwise to next firing position Piston 1 at TDC in Cyl. 1 Piston 4 at TDC in Cyl. 4 4 Rotates to this position When Cyl. 4 is at TDC Pushrod on cam heels 1 4 NB. Compare these two profiles with EW drawing for 1 and 4. They are the same! 45 deg. 90 deg.

4 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 position relative to Cylinder 1 The given firing order by EW is: 1, 4, 3, 8, 7, 6, 5, 2.

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

6 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!

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

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

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

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

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

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

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

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

15 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.


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