Please play nicely. No one wants to listen/read a keyboard warriors rants....
Resonation is in the line of the valve (it cant occur at a right angle due to the valve guide).
Simple physics, a spring with a mass will have a resonating frequency which may be in the engine operating range ( e.g a specific rpm).
Add a second smaller spring inside the main one and design it so that it resonates at a different frequency and when one of them resonates, the other wont and hence you overcome the issue.
Or make the springs stronger and design them so they only resonate at very high rpms beyond the engine operating range, this is not good for pushrod and rocker engines as it results in larger components being needed (stronger) which increases the valve train weight.....which is not good as it limits the upper rpm range....thats a major advantage of OHC....lighter valve train
Not totaly conviced on your torque talk...its the crank that converts a linear motion into a rotational one and hence its the crank where the torque is produced.
that makes sense re the resonating and the smaller spring inside the bigger one. however one thing i've obviously missed which i should have asked...... what's the actual problem with resonating? noise? worn parts? soz should have asked really.
as for the torque talk. as far as i know, yes, the crank is where the torque is ''given'' to the drive shaft, but its what happens in the combustion chamber and the acts and forces on the pistons that sends that power...... or have i got confused with the question?
The Vectra VXR does not have brilliant handling nor is the handling terrible, my father now owns one in estate form and it handles rather well for a fwd car with close to 280bhp, I think the car gets slated so much for its handling as people tend to think of the handling issues that the Astra VXR has.
In isolation and at slowish speeds its fine. Push it hard and it is really bad. There is no other way to describe it. Compare it to something properly sorted like a ST220 and you realise how much worse it is.
As stated 1 "0" ring seal sits into the recess on the coolant transfer pipe...its a VX part only and also wise getting the bridge dowty washers there too.
