Q-40 Racing Discuss AMA 422 and any other variants of Quarter 40 racing

Older Nelson q40 engine

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Old 12-09-2007, 10:46 PM
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ecoliburger
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Default Older Nelson q40 engine

Have an older Nelson q40, found a carb that will fit with some machining. Noticed that there is a small port in the front of the venturi that must feed the front bearing. Also noticed that the newer Nelson that I have does not have this. wondering if this is necessary? Putting a carb on the thing, can I just cover this up or should I drill a hole in the carb to replicate this. It does have a channel in the block that directs oil to the front bearing as well. Also are the bearings the same size as the newer ones? If anyone knows off hand.
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Old 12-10-2007, 12:41 PM
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Jerry-B
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Default RE: Older Nelson q40 engine

ecoliburger

Forget about the hole that goes to the front bearing. Nelsons have not had it for a long time. I have epoxyed mine
closed on my older motors.
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Old 12-10-2007, 09:51 PM
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Default RE: Older Nelson q40 engine

Great thanks for the reply Jerry.
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