Author Topic: Weight of valvetrain elements? (Read 3362 times)

Philip_pl · « **on:** May 06, 2008, 03:08:27 PM »

Could anyone tell me the mass of M42:
- valves
- valve springs
- hydraulic lash adjuster

Thank You in advance!!
Phillip

swiss318is · « **Reply #1 on:** May 06, 2008, 04:51:20 PM »

i done that once at home...
80g the hydros
22g the retainer and the keeper
60g the springs
60g intake valves
54g outlet valves
its only more or less... the scale was very imprecise!

Philip_pl · « **Reply #2 on:** May 06, 2008, 05:11:19 PM »

GREAT! THANKS!

Do you know the weight of inner and outer valve spring alone?

Was the hydro filled with oil when you were wheighing it?

swiss318is · « **Reply #3 on:** May 06, 2008, 05:29:16 PM »

the hydros were empty and i have no idea of the weight of the springs alone.. only together! the head is assembled again, so i cant go and do the wheighting again. sorry

colin86325 · « **Reply #4 on:** May 06, 2008, 05:59:19 PM »

The ETK lists the weight of the parts:

http://www.bmwfans.info

Philip_pl · « **Reply #5 on:** May 07, 2008, 03:12:10 AM »

Thank You.
I have only looked on realoem.

Boyracer · « **Reply #6 on:** May 07, 2008, 04:09:56 AM »

E30 and early E36 (7 mm stem)

intake valve: 58 g
inner spring: 15 g
outer spring: 48 g
retainer: 17 g
lifter: 73 g (measured by me)
TOTAL: 211 g

E36 late (6 mm valve stem)

intake valve: 47 g
inner spring: -
outer spring: 51 g
retainer: 11 g
lifter: 60 g (measured by me)
TOTAL: 169 g

E36 late FTW

To be more accurate about effective valve train mass, valve spring weights should be counted as half of their real weight and hydro lifters should have some 10-20 g of mass added due oil.

Philip_pl · « **Reply #7 on:** May 07, 2008, 05:02:12 AM »

As far as I know you should use 1/3 of valve spring mass. At least that's what I found in books.

Boyracer · « **Reply #8 on:** May 07, 2008, 03:20:59 PM »

Could very well be 1/3 only, I guestimated 1/2 by myself since I thought it cannot be 1/1 because not all of the spring mass is moving up and down like valve for instance

Philip_pl · « **Reply #9 on:** May 07, 2008, 04:12:03 PM »