ALH valve springs vs 16v,8v, VR6 Valve springs

[lord_verminaard]

FYI, in my short time working for VW, the ONLY major mechanical issues I ever saw with TDI's was valve springs failing- spring would crack and collapse, valve would drop, piston hit valve, then valve would drive a hole through the lifter, then shear the cam.  Not pretty.  Saw two of these instances in a year of working at the dealership.  These were both bone stock cars with a moderate amount of mileage.


Edit: I'll add that I never saw this with any 2.0 gassers so it would be safe to assume that the TDI springs are lighter-duty, as there is no other logical reason why they would fail in a TDI if the camshaft profile is more mild and it sees less RPM's.  A quick ETKA check shows different springs for the 2.0 and the ALH.  I always thought they were the same.

Brendan

[RabbitGTDguy]

Hmm...I am wondering if the "HD 8v Valve springs" that Autotech sells are an upgrade from some OEM spec motor. I found a new set of them locally for 65.00. Might be worth my interest...

Joe

[Helliouse]

Here is some information I have found.

Installed height
30.6mm / 30.5-31mm - 1.2007874"
ID - 23mm - 0.905511811"
OD - 30mm - 1.18110236"

Seat pressure that I have read tossed around for seat pressure, between 90 and 100lb.
The only stumbling block right now is spring rate, what rate do we need.

I have found some bee hives that will work but it will require some removal of material...about .2"(7mm) from the spring seat, not including a washer to prevent the spring machining into the head.

My only concern is they had a video of these springs in action, and they where bouncing at 6500rpm, cam profile plays a big part in this; with ours being so very mild... :?:

 :!: Note: I am just researching, if you choose to buy these and use them…that’s your choice. I am, in no way, recommending them, or saying they will work.

http://www.pacracing.com/Beehive_Springs-PAC_1223_Set_of_16.html
OD: 1.105" - 28.067mm (Big End)
ID: 0.742" - 18.84mm (Big End)
90 lbs @ 1.470" (Recommended install height) 37.338mm
252 lbs @ 0.970" 24.638mm
Lift: 0.500" 12.7mm
Max Coil Bind .900" 22.86mm
Spring Rate 324.0Lbs/in
Spring Weight 37.6grams

If I find anything else I will post.
If any one knows how much we can take out...

[Helliouse]

Hello,
Can any one confirm these numbers?

Valves dimensions
7mm stem dia.
0.275590551" Dia.

96.9mm total length
3.81496063"long

3x 1mm Valve Keeper Groves Rounded
10mm Bottom of low grove to top
1mm back cut angle width

Intake Valves
36mm dia. valve
1mm margin .5mm bevel
2.5mm Seat

Exhaust Valve
31mm dia. Valve
2mm margin
2.5mm seat