Valve spring preload

[camelotr]

Hi,

Is there a formula to count valve spring seat pressure? I am building a Land Rover 2.25 petrol engine, and cant find info on the subject.

Edited by camelotr on Tuesday 7th April 19:54

[camelotr]

Hi,

Thanks for the answers. I was soo bussy for a few days that no time I had for the net. Sorry.

So, my question was how to count how much seat pressure does an engine need of a given size valve/valve seat area - if there is a way to count.

The Landy I am rebuilding has very-very low seat pressure, I am pretty sure its springs are gone.

[camelotr]

Hi David,

I think we are misunderstanding each other.
I would like to get only the seat pressure, and not peak pressure. Seat pressure is something that is important on all engines even with stock springs.

Is there a way to count minimum seat pressure for a given valve seat area?

[camelotr]

Snake the Sniper said:

With something like the 2.25, I wouldn't even bother checking them if in doubt, as they're £3 or so each.

I ordered the springs, they are on their way, but I would like to check them as they are REALY inexpensive right down to a level, where I have doubts...

Btw an engine is an engine. No matter what kind, I try to give the same amount of precision to each. On one bench I do this Landy, on the other a 930 Turbo.

[camelotr]

Exactly. That was a bad hungarism.

Me sorry :-).

So, "calculate" is the right expression.

[camelotr]

I have found an old book in my schools library, and it had some information, quite similar to what You sad. I will take it a a guideline. Although the seat pressure of this landy is definitely too low. I can fit the valve caps by bare hand :-).

Kart? What type? I just decided to build a cyclekart with my kids for fun.