new valve springs - thinner than old

[FattyBoomBatty]

I just got my new "heavy duty" valve springs in the mail, opened the package and checked them out. They looked a little thin from what I remembered, so i compared them to the ones on the head in my garage and it do indeed look thinner than the stock ones.

Should this concern me? There was a label on the box that i'm sure the guy I bought them from scratched off, but it says pressure 100lbs. So, i believe they are the 100lb springs, and they fit in the retainers.

thanks.

[carltalon]

I think my Crowers look a little thiner then the stock ones. what brand are they suposed to be.

[EclipseGST]

Take them somewhere to check what pressure they are. Are the coil diameter smaller, like the thickness of the metal or is the overall size smaller?

[FattyBoomBatty]

I think they are schneider, that's the only brand i've heard of that makes replacment/upgrade springs specifically for the car. the diameter or the spring coil, not the overall diameter is what is thinner.

[niterydr]

Thinner spring diameter would mean a higher coil bind number.
If you are really worried have them tested at different seat heights.

[FattyBoomBatty]

Yeah, i was talking to my cousin about that and he suggested taking it to a machine shop and having them tested, but if i post on SQC and see if anyone else has these and hasn't had any problems, might I be able to just toss them on? thing is, I'm not going with higher lift, it's stock valvetrain, so it should be like stock.

[niterydr]

If they are weaker a valve could hang up and kiss a piston.
Not a pretty match.
If they are too stiff you are wasting horsepower on drivetrain.

[FattyBoomBatty]

that's why they are only 100 lb springs :) slightly stiffer than stock, it'll give me peace of mind at 6500 rpm. :)

[Jakey]

that's why they are only 100 lb springs

Keep in mind that that force is going to increase as the spring is compressed: F=-kx where x is the distance and k is your spring constant.

[CVD]

Yeah....but conquests cant eat valves can they? Why dont you toss em in and see where valve float is.