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!

 

nobody huh?

 

Probably 80% or more of the time on engine we get with a bad cylinder especially detonation it is number 7.

 

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.

 

I did the same thing, installed my 2 highest flowing injectors right onto cyl's #7 and #8.

 

#7 was the culprit when my engine went.... det. took out the rod bearing. AFR 205 heads, Torquer @ cam and supporting mods....

 

i had.

 

Are these modded engine?

 

Mostly stock but both.

 

My stock motor broke the ring landing on #7 cylinder

 

#7 cylinder was the death of my LS1...
Lost compression and oil was getting past the ring

 

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.

 

BUMP .... anyone else?

 

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.

 

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.

 

my #7 is the one with the crack in it...
sucks

 

Wow. Interesting ...

 

Bump for others ....

 

I'm with the guy above Cyl 5 low compression and oil past rings

 

so how does this normally happen.... my car has 56k and i dont wont to be let down by my ls1