Dead Cylinder question...
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Tuned
Joined: Feb 2019
Posts: 273
Likes: 5
From: Bardwell Tx
Dead Cylinder question...
Okay, fresh built 460 with Edelbrock ProFlo4....
When initially trying to get this new motor started the #5 intake threw the rocker arm. I "thought" that I fixed it and after a few phone calls to Edelbrock regarding proper mapping.... she fired up, I broke her in properly and have been running/driving for at least 30 minutes per week. Well, did a compression test today and #5 was at ZERO!!! I pull the valve cover and realize that I didn't have the dadgum pushrod on the dadgum lifter. I get it aligned "correctly", do a few test runs with the valve cover off and it seems to be fine. I must have nicked a wire or unplugged something on the EFI because she won't stay running.... but she sounds MUCH better and smoother than before....
My question is.... do you think I damaged anything by running on 7 cylinders for that duration of time??
When initially trying to get this new motor started the #5 intake threw the rocker arm. I "thought" that I fixed it and after a few phone calls to Edelbrock regarding proper mapping.... she fired up, I broke her in properly and have been running/driving for at least 30 minutes per week. Well, did a compression test today and #5 was at ZERO!!! I pull the valve cover and realize that I didn't have the dadgum pushrod on the dadgum lifter. I get it aligned "correctly", do a few test runs with the valve cover off and it seems to be fine. I must have nicked a wire or unplugged something on the EFI because she won't stay running.... but she sounds MUCH better and smoother than before....
My question is.... do you think I damaged anything by running on 7 cylinders for that duration of time??
Mountain Pass
Joined: Jan 2019
Posts: 136
Likes: 1
From: Fort Bend County
It's possible.
A dead cylinder can mean that the piston was run with no lubricant as the gasoline would wash the cylinder walls and cause premature wear on the rings and or cylinder itself.
A dead cylinder can mean that the piston was run with no lubricant as the gasoline would wash the cylinder walls and cause premature wear on the rings and or cylinder itself.
Cargo Master
Joined: Dec 2008
Posts: 3,217
Likes: 322
From: SW PA
Okay, fresh built 460 with Edelbrock ProFlo4....
When initially trying to get this new motor started the #5 intake threw the rocker arm. I "thought" that I fixed it and after a few phone calls to Edelbrock regarding proper mapping.... she fired up, I broke her in properly and have been running/driving for at least 30 minutes per week. Well, did a compression test today and #5 was at ZERO!!! I pull the valve cover and realize that I didn't have the dadgum pushrod on the dadgum lifter. I get it aligned "correctly", do a few test runs with the valve cover off and it seems to be fine. I must have nicked a wire or unplugged something on the EFI because she won't stay running.... but she sounds MUCH better and smoother than before....
My question is.... do you think I damaged anything by running on 7 cylinders for that duration of time??
When initially trying to get this new motor started the #5 intake threw the rocker arm. I "thought" that I fixed it and after a few phone calls to Edelbrock regarding proper mapping.... she fired up, I broke her in properly and have been running/driving for at least 30 minutes per week. Well, did a compression test today and #5 was at ZERO!!! I pull the valve cover and realize that I didn't have the dadgum pushrod on the dadgum lifter. I get it aligned "correctly", do a few test runs with the valve cover off and it seems to be fine. I must have nicked a wire or unplugged something on the EFI because she won't stay running.... but she sounds MUCH better and smoother than before....
My question is.... do you think I damaged anything by running on 7 cylinders for that duration of time??
Run it on all eight for a few hundred miles and do a compression test.
Thread Starter
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Tuned
Joined: Feb 2019
Posts: 273
Likes: 5
From: Bardwell Tx
Will do.... it had the same reading as the others once I figured out what the issue was.
Laughing Gas
Joined: Nov 2013
Posts: 1,207
Likes: 60
From: S.E. Louisiana;so far USA
Well, if the error occurred on the dadgum #5 intake, probably little or no fuel entered #5 cylinder. Possibly little or no damage was done. If you are now getting similar values, I support the notion of driving it a few hundred miles and retest.
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