W2 head installed valve spring height
The 120 seems too low for me as well. I'm confused about the 540lbs/in. Where is that?
Specs are
[email protected] &
[email protected]
That’s a gain of 270lbs in .500.
270/.500 = 540
I find that spring specs in catalogs are just wrong surprisingly often.
For example, the paperwork that comes with a set of TF240 heads for a BB Mopar shows the part number and specs for the three spring options for those heads.
The specs for the middle option, the hyd roller spring, are just wrong. Seat load, open load, rate...... all wrong.
It’s a PAC spring...... if you look in the PAC catalog the specs are correct.
If you go on line and look up the specs in the valve spring section of the TF website, the specs agree with the PAC catalog.
So, the specs from TF are different...... depending on where you look.
One set of specs is correct, the other isn’t.
One of the warehouses I buy from has there own “house brand” of springs.
They buy them from some supplier and put them in their own boxes.
Most of the specs for them are wrong in the catalog...... and some are pretty far off.
The catalog shows the seat load, open load, and rate...... and for many of them...... the numbers don’t add up.
Either the loads are wrong, or the rate is wrong, or the checking heights are wrong.
Where ever the problem lies, the result is the same....... the springs don’t(and can’t) match the specs in the catalog.
Here’s two examples:
Specs:
[email protected]/
[email protected], rate = 269lbs/in
[email protected]/
[email protected], rate = 300lbs/in
I’ll let you do the math..... you tell me if all those specs are correct.
I would never use a set of springs(without testing them) where I wasn’t very familiar with that brand & part number without making sure they were close to the published specs
I’ll be curious as to how those MP springs of yours check out.
