LS Hydraulic lifter limitations

[Rob Wright]

Originally Posted by SSDiv6

also in charge of the engine development for the Corvette and Cadillac LS road racing engines.

Mmmmm........to be fair & honest, not really true for those specific programs.

[Mark Lewis]

ON the short travel hydraulic roller lifters what is the best valve adjustment to get the best performance out of the lifter. Assuming not too much spring rate or valve train weight

[Rob Wright]

Originally Posted by Mark Lewis

ON the short travel hydraulic roller lifters what is the best valve adjustment to get the best performance out of the lifter. Assuming not too much spring rate or valve train weight

I honestly cannot answer that. I followed the supplier's recommendations and it wasn't as good as a normal full travel lifter with plunger set half-way down.

Someone somewhere may have found a way to make this all work out but it was complex and risky enough for my situation to cause me to stop looking at it once I saw worse dynamics in an otherwise stable setup that would spin clean-clean to well above 8000 RPM.

[e vassar]

Thanks everybody. To be honest..Ive never even had a valve cover off.
I will get it apart..see whats going on with rockers,springs,etc. check spring pressures and...probably ask for more help.
Rob,Darren .what should I do with the coils? Theyre still on the valve covers.

[GUMP]

That's where I have all mine.

[Rob Wright]

Originally Posted by e vassar

Thanks everybody. To be honest..Ive never even had a valve cover off.
I will get it apart..see whats going on with rockers,springs,etc. check spring pressures and...probably ask for more help.
Rob,Darren .what should I do with the coils? Theyre still on the valve covers.

Unless you have a packaging concern I suggest you leave them on the covers.

I've heard some dreamed up "imagineered" reasons to move them but there really isn't any good functional reason why it would be better to put them anywhere besides where GM put them.

[Adger Smith]

The best reason I can see to leave them where GM put them is the shortest possible plug wire with less chance to arc to something and with less voltage drop.

[e vassar]

Originally Posted by Adger Smith

The best reason I can see to leave them where GM put them is the shortest possible plug wire with less chance to arc to something and with less voltage drop.

Yes after further study under the hood,I think you guys are right. No big thing just unplug the harness and plug wires to remove valve covers. I need to stop trying to outthink those G.M.engineers.
Thanks again

[SSDiv6]

Originally Posted by Rob Wright

Mmmmm........to be fair & honest, not really true for those specific programs.

The GM Performance marketing video seem to imply so when "Bad" Robin was pulling the dyno lever...

[Rob Wright]

Originally Posted by SSDiv6

The GM Performance marketing video seem to imply so when "Bad" Robin was pulling the dyno lever...

Yo've got that backwards amigo. I'm the good one, the other guy is the evil one, according to his own staff.

But - after a week with me they did say the lines between good & evil were very blurry.