two questions:

1. how strong is the main spring in the lifter?

2. what are the "composite" trays made of?

thanks.

 

Not very, and
Plastic.......

 

nobody?

 

I answered your questions in my post.....

 

please dont bother posting b.s. what has this section become, a cabaret?

 

Why not be more specific as to the problem or issue

1. If you buy new or aftermarket lifter trays there is a chance they aren't made of the same materials or perhaps made differently 3D tensor wise, so just because somebody has performed materials analysis doesn't mean it will apply to all lifter trays and even if the material is the same it could have different properties as computer modelling and stress analysis is improving over time constantly, thus any answer is as good as far as you can throw it.

2. The spring to which you refer I assume is the one intended to maintain lifter plunger position during an unloaded position with the force applied to keep the pushrod pressed into the rocker when there is no oil filled cavity present as often occurs just after spring has squeezes the oil out of lifter oil orifice during engine off position "bled down". I assume the force is decreasing with age.
You may easily measure this force in a given lifter simply drain the oil and then apply necessary force it should be similar to linear relationship as with hooke's law I think, F=-kx , spring constant k displacement x, you find force and displacement to find the constant k. As one of the simplest equations in the nature of this curiosity advise any measurement result will be useless to those asking such a question.

 

What B.S.? What I posted is truth. Sorry I confused you....

 

Sometimes you just can't help people.
Grinder is one of the more helpful people on this forum. He gave you a clear solid answer.

 

kingtalon, i know how to measure a spring. i was wondering what kind of sprigs to get as "checker springs", so they would not depress the plunger and thought somebody would have the info.

the tray material is intriguing, because "plastics" usually have a thermal expansion coef. of over 100x10^-6/°c (about 10 times larger than steel) and their modulus goes down to 1 gpa fast with rising temp (yes, glas fibre filling helps). so the question is, what material combination provides the neccessary precision and rigidity at over 100°c while having favourable tribological properties? the slick stuff is usually soft.

(its sad to see the bullet become a mixture of ads and posts for the sake of posting. if you have nothing relevant to say, dont (→general internet etiquette), or go to twitter and facebook. imo the above responce is an attempt at a joke at best or an insult, implying op would have thought the matarial being wood or dough and his grasp on forces only alows him to differentiate between strong and weak. if this is considered as helpfull, then good night.)

 

I wonder whats with the plastic as well but thats how they make em and I don't see anyway to reliably affordably test them in a manner empirically enough to gain data which even remotely resembles operating conditions over the course of say 250k miles. So asking the question is great but even if we have an answer you still stuck buying from the selection of whats available. I wouldn't even consider a prototype of something so cumbersome looking. What odd shapes and intense focused stress application due to potential lifter forces. I shudder at the thought of going where you are. I say work smarter not harder, focus on the acquisition of quality set of proven lifter trays and move forward, don't get stuck here.

 

When you post as vague a question, as you did in your original post (quoted above), what kind of answer did you expect? Only then, several post later, you start something akin to an "engineering white paper", stating what you ACTUALLY want to know, and then infer that people are impolite, because they're not mind readers, and didn't know what information you were looking for..............

 

I wasn't attempting a joke, or insulting you. Ask a simple question, get a simple answer. How am I to know what answer you're looking for, if you don't elaborate? How would I know you even know what the trays look like? Bottom line, I can't read minds, and if I could, I sure as Hell wouldn't have retired in my 60s. I'd have known everything by 10 years old, or sooner. I'm also not a chemist, and there's nobody on this forum, including YOU (or you wouldn't have asked) that knows the chemical makeup of the plastic trays. GM would be the only one that could answer with any authority. If you wanted a stiff enough spring in your lifter to do as you've (now!) explained, I don't know that answer, because the way most people determine the answer you're looking for is by disassembling the lifter, and making it a solid lifter. There are plenty of videos out there. I've been accused of being long winded. My response to you was short, accurate, and to the point. State exactly what you're looking for, and we'll all try to help.......

 

Thank you. I do try......

 

Lol he is right though … he left out the simple fix .. Get some upgraded lifters

 

Just an observation, to ask a question and do a response to the question you have to have a set of Steel things hanging. Not complaining, just observing.

BTW, on this glorious day of our Independence from Ternary from a Despot,

LETS GO BRANDON.

 

i havent been to this section for a while and obviously its the wrong one to ask what it tried to find out. lets forget it.