This thread makes me ask what makes the stock cam so good? Do you think engineering for milage and efficiency just so happens to make for good power?

 

I don't think the stock LSJ cam is hardly considered "good". It works the way it was intended for an oem application. Fuel economy, idle, emissions, and power, all things considered it balances nicey. From a purely power gain perspective, any bigger cam profiled properly for a supercharger will be superior, the issues come into play with the valvetrain like the original post talks about where you run into diminishing returns from those limitations. Im sure debate will rage over solid lash adjuster performance as well. Japeatr would be in a good position to clarify on that since he is working with them now.

 

keeping zero lash is not the problem keeping the lash adjuster from colapsing is even when it colapses it still maintains zero lash just lift and duration is lost


lmfao

japs not working with them yet i am i have blanks out to get ground for solid lash adjusters you cant run solids on a hydraulic cam there is no slow fown ramp for valve closing

the stock cams are dam good they give a well rounded performance window but there are improvements to be made

 

What exactly is involved in the conversion process for the solid lash adjusters? If you cant run the same cam, I would imagine the follower/rocker needs to change as well.

 

Wouldnt the lash adjuster bottoming out or collapsing cause it to be unable to pump up (fast enough) once the lobe of the cam is off the follower again, thus resulting in a nice valve tick?

 

cam change and solid lash adjusters the stock follower will work with the bates stuff

i have yet to have mine do that they seem to recover rather fast by allowing the valve to close

 

Reading all this, but doubting that our lash adjusters work as described... Isn't there a small valve inside the hydro adjusters that trap the oil inside, making it solid as liquid is pretty incompressible...
The oilpressure is needed to extend the adjuster in the unloaded cam phase untill it reaches zero lash to the base circle.

Can see this one failing if the internal valve is not closing well (collapsing lifter), or there is some air in the oil (areated oil...)
Hydro cams have quicker ramp-up than solid cams, just to close this valve shut, right?

 

I took one apart and only found this...

 

lol need help?

 

thre really isent that much oil in the lash adjuster and when the exh lash adjuster is trying to suppport the valve being shoved through spring pressure and post combustion pressure it blows through its travel by blleding off oil pressure and internal spring pressure also collapsing



thanks man photobucket is being a **** sucker tonight

 

I have always meant to ask you what you use for uploading photos, because you are the only member on this site whos photos I can never see.

 

^hostthenpost is the image hosting site he uses.

 

just so you and anyone else can see, here is spawnes pictures of a dissassembled last adjuster

 

i use photobucket but its been a ********** lately so i coppied and pasted spawne32 link

 

thank u.

 

is the site blocked or something? i never have any issues viewing them when i posted them, and ive never gotten any complaints about the site either

 

Prob on my work computer, but your pictures are the only ones I ever had an issue with.

I found it out, and always meant to ask u.

 

probably because its my own image hosting site lol photobucket and the other well known sites are probably allowed to pass through your company firewall.

 

Our stock lash adjusters bleed down easily. You can do I with a pair of channel locks and moderate pressure.
There is clearance between the body and piston, obviously. Push it hard enough and oil will flow through.

 

Is that the old design or the new design, because I needed a vice to bleed down the one I disassembled.

 

i think they all work the same they just change the end up or maybe the spring in the bottom but you also have to look at they restrict the volume and pressure going to the lash adjusters which is part of the problem and how much oil the lash adjuster holds is another. if you open up the restrictor in the head you pull oil awy from the crank

 

Quite a few of the 4G63 guys open up the orifice on the restrictor to the head when running more aggressive cams. How much I could not tell you, as I have never really looked into it or thought much about it.

 

they also have a bigger lash adjuster then we do and their engines may oil in a differently then ours also

 

That's funny, cuz I'm at work, and his are the only ones I can consistently see. I can't normally see anybody elses.

 

lol