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Road Side Jerry
Road Side Jerry, Auto Mechanic
Category: Classic Car
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Experience:  classic car mechanic
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Odd spacing on the distributor points lobes

Resolved Question:

Does the Dauntless 225 odd-fire distributor have even spacing or odd spacing on the distributor "points" lobes
Submitted: 4 years ago.
Category: Classic Car
Expert:  Road Side Jerry replied 4 years ago.
What is the make,model and year of the vehicle?
Customer: replied 4 years ago.
1967 CJ5
Expert:  Road Side Jerry replied 4 years ago.
This is a 1967 ,I am asking that it be moved to classic,the correct category for it.
Customer: replied 4 years ago.
ok so will someone else answer my question?
Expert:  Road Side Jerry replied 4 years ago.

Hello Clearwater,sorry for the delay,the question needed to be switched to the correct category,then my server crashed.

The distributor on these engines is a real source of confusion. If it has an odd-fire pattern that results in 45 and 75 degree spacing on the lobes around the distributor shaft, you would think the distributor cap has that same sort of spacing? No, not in this case. What the original engine designers did was take advantage of the fact that the contact point on the rotor can be made longer than normal. Draw a circle that follows the circumference of the rotor's outer contact, then draw a straight line from the center of the circle to one end of the rotor contact and another line to the other end. What you've just drawn is an angle of at least 15 degrees. Since the evenly spaced lobes on an odd-fire points type distributor cap are 60 degrees apart and the distributor shaft lobes are at 45 and 75 degrees, a little subtraction tells you that this will all work out. Simply put, 50% of the time ignition is taking place when the forward end of the rotor contact passes a distributor cap lobe, and the other 50% of the time ignition happens when the trailing end of the rotor contact passes a distributor cap lobe. Here are some pictures of the components.

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Road Side Jerry, Auto Mechanic
Category: Classic Car
Satisfied Customers: 2948
Experience: classic car mechanic
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