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How Many Of You Have Had Problems W/Cylinder #7?

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Old 04-27-2009, 07:41 PM
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Default How Many Of You Have Had Problems W/Cylinder #7?

Hey all,

Just wondering how many guys have had problems w/cylinder #7 (specifically w/regards to running lean or low pressure) and what the surrounding circumstances were? (Stock, modded, happened during racing, not racing, etc)

Thanks!
Old 04-28-2009, 11:55 PM
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nobody huh?
Old 04-29-2009, 12:38 AM
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Probably 80% or more of the time on engine we get with a bad cylinder especially detonation it is number 7.
Old 04-29-2009, 01:58 AM
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When I bought my flow matched injectors they came with 2 injectors that flowed around 1 lb more. I was instructed to install these in #7 and #8 so they would get addequate fuel flow. Sounds like a good idea to me, it looks like all of the air from the intake manifold gets shot straight to the back. You know which runner is at the back of the intake, oh its #7. Chances are #7 is getting more airflow than the rest of the engine and it needs extra fueling to avoid detonation.
Old 04-29-2009, 05:22 AM
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Originally Posted by Nitroused383
When I bought my flow matched injectors they came with 2 injectors that flowed around 1 lb more. I was instructed to install these in #7 and #8 so they would get addequate fuel flow.
I did the same thing, installed my 2 highest flowing injectors right onto cyl's #7 and #8.
Old 04-29-2009, 06:17 AM
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#7 was the culprit when my engine went.... det. took out the rod bearing. AFR 205 heads, Torquer @ cam and supporting mods....

Last edited by SSdreamz; 04-29-2009 at 11:58 AM.
Old 04-29-2009, 10:30 AM
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i had.
Old 04-29-2009, 10:58 AM
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Originally Posted by racer7088
Probably 80% or more of the time on engine we get with a bad cylinder especially detonation it is number 7.
Are these modded engine?
Old 04-29-2009, 11:18 AM
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Originally Posted by Xtreme57
Are these modded engine?
Mostly stock but both.
Old 04-29-2009, 11:24 AM
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My stock motor broke the ring landing on #7 cylinder
Old 04-29-2009, 11:41 AM
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#7 cylinder was the death of my LS1...
Lost compression and oil was getting past the ring
Old 04-29-2009, 12:11 PM
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Wow ... this is starting to get interesting. Just for the record my car's #7 rings went to sh** after 80k and no mods other than cat back.
Old 05-03-2009, 06:20 PM
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BUMP .... anyone else?
Old 05-03-2009, 10:32 PM
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I was told from a machine shop, that the cam shaft twists and you have to allow more PTVC on cylinders 7 and 8.


My GF's ls dropped cylinder 5, low compression, oil past the rings.
Old 05-03-2009, 11:14 PM
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Yep. Almost every engine I've ever replaced due to failure had something wrong with #7.

They especially run lean w/ a FAST intakes on the car.
Old 05-03-2009, 11:19 PM
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my #7 is the one with the crack in it...
sucks
Old 05-06-2009, 08:54 PM
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Originally Posted by dangerjakeray
my #7 is the one with the crack in it...
sucks
Wow. Interesting ...
Old 05-08-2009, 01:40 AM
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Bump for others ....
Old 05-08-2009, 07:06 AM
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I'm with the guy above Cyl 5 low compression and oil past rings
Old 05-08-2009, 07:09 AM
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so how does this normally happen.... my car has 56k and i dont wont to be let down by my ls1


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