ok , this question came to my head last night right before bed , and i was thinking if i.e. say you set up your passengeres side valves to 3/4 of a turn and your drivers side valves to 1/2 of a turn , "yeah i know why would someone do this , its just theoretical" ok so , since third gens have the oxygen sensor on the drivers side WOULD this be a possible scenario , since your dirvers side valves arent as tight as your passengers side , would the drivers side valves open less than the passengers side ? PART TWO, since the passengers side valves open more , would that side of the engine draw more vaccum thus more fuel would go to the passengers side ? and also since the drivers side valves open less would the drivers side of the engine run lean therefore causing the oxygen sensor to read lean and command the ecm to add more fuel and cause the engine to run rich ?

i know it sounds kind of confusing but please take your time and read , i want your opinions , good ones or bad ones , im just curious to see if this is possible .

 

come on guys, no one? i thought this would get interesting
i love those strange thoughts that spawn in your head at some times, like right before going to bed.
for myself i gotta say i haven't a clue about this, but i'm pretty sure the difference wouldn't even be what they call marginal.

 

IDK how O2 works but since it's in the mainstream,I think the O2 would still pick up a rich//lean condition.My own belief is propper adjustment & timing will help find anything else out of whack,possibly a bad O2 sensor,bad cam lobe,poor fuel delivery.
I'm not too hip on ECM stuff.
Just my 1 cent & I owe you change.

(edit)
My O2 was previously just ahead of the cat.ECM had been removed so there is no O2 snsr now.

 

If neither side is adjusted correctly you will have a poor running engine. SO much so that you won't notice any rich or lean condition. You will notice a terribly running engine.

 

Whether it's 1/2 or 3/4 of a turn, if the lifters are in their adjustment zone, they will compensate for the difference and the result (should be) zero lash. That is why the manufacturers started using hydraulic lifters to begin with; they make up for small errors.
Now if you are talking about running different lash with solid lifters, that is a different story.

 

this theory would apply to stock roller type .

 

i think dixiebandit made a good point. forgot that this is why we got hydraulic and not solid valvetrains in the first place - no lash adjustment routine necessary here.

 

If we are talking about factory hydraulic roller lifters, or any hydraulic lifter, it's either in the "zone" that it is supposed to operate in, or it's out. You can have it too loose, and you will end up with a rattling valve/rocker arm. If you have it too tight, then you have a valve hanging open.
I personally like to err on the side of caution and only give them half a turn, and if I hear any noise or feel looseness, I'll give it the extra quarter turn.
It's one thing to have a loose rocker arm, and another to have a valve that won't close all the way and ends up getting burned. Then you have to take the head off and go through all that trouble again.
If you need any more explaination, let me know.

 

You must understand that with hydraulic lifters you tighten the rocker arm until you feel the slightest bit of tension while spinning the push rod.

Everything is now in contact, we are at what is called "zero lash".

The extra 1/2, 3/4's of a turn is to preload the plunger, ideally halfway through it's travel. so that it can pump up/leak down accordingly.

So the extra 1/4 of a turn is not enough to disrupt the plunger's adjusting capability. Perhaps in a different specification it would make a difference.

Also, it is better to have loose valves than tight valves. Because valves wear into their seats.