Engine knocking

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bybirius
Posts: 31
Joined: May 29th, 2012, 5:41 pm
Body Type: AA
Model Year: 1930
Location: Atlanta
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Engine knocking

Post by bybirius » April 11th, 2015, 10:51 am

Hey Guys,
Got my engine together and have been running it lightly for a short time now. As I run through the gears, I am getting a knocking sound. It begins knocking in first gear just as I'm about to shift to second, then again as 2nd is topping out and about to go to third, it knocks, then the same with third and again as I top out in fourth. I'm running an FS electronic ignition with auto advance and when I retard the timing it doesn't hardly knock but then is obviously very sluggish from idle and spits and backfires, etc. I've been thinking it's a timing issue, but with it sitting idling the engine sounds just fine but when I short plug wire 3 with a screwdriver to a head bolt, I hear the bump bump bump bump.
What do you think? Am I climbing under there again, pulling the pan and hunting babbits?
Mark -Atlanta

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spectria
Posts: 1874
Joined: May 15th, 2008, 9:53 pm
Body Type: Mail Truck, Stakebed
Model Year: 1931
Location: Quincy, Ca.

Re: Engine knocking

Post by spectria » April 11th, 2015, 1:03 pm

bybirius wrote:Hey Guys,
Got my engine together and have been running it lightly for a short time now. As I run through the gears, I am getting a knocking sound. It begins knocking in first gear just as I'm about to shift to second, then again as 2nd is topping out and about to go to third, it knocks, then the same with third and again as I top out in fourth. I'm running an FS electronic ignition with auto advance and when I retard the timing it doesn't hardly knock but then is obviously very sluggish from idle and spits and backfires, etc. I've been thinking it's a timing issue, but with it sitting idling the engine sounds just fine but when I short plug wire 3 with a screwdriver to a head bolt, I hear the bump bump bump bump.
What do you think? Am I climbing under there again, pulling the pan and hunting babbits?
Your description sounds like piston knock (rattle)?
Dave in Quincy, Ca. I love Pics!!!! Post them All!!! :)
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bill worden
Posts: 11
Joined: March 9th, 2015, 9:36 am
Body Type: standrive
Model Year: 1931

Re: Engine knocking

Post by bill worden » April 12th, 2015, 6:06 pm

It may just be time to go down another babbit hole. :|

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