Quote:
|
Originally Posted by Sidecarbod Hi Guys,
I've never been very happy with the valve preload on my RV8 as I used shims and found that it was impossible to set the valves up as accurate as I wanted to.
I am planning to buy a set of adjustable push rods from someone like Real Steel. (Unless anyone has a set for sale!)
My questions are:-
1. What is the advantage of going for the larger diameter rods baring in mind that the holes in the heads will need to be opened up.
2. I understand that the larger rods must be stronger but at what point are they needed? |
No advantage unless you are running very heavy valve springs and high revs. There is a disadvantage if they are heavier than standard because they add inertia which will cause standard springs to 'float' sooner.
Quote:
|
Originally Posted by Sidecarbod Hi Guys,
3. Would it be true to say that the more clearance there is between the snap ring and rod seat plunger the sooner the valve will start to move off it seat as the cam follower starts to move? i.e. similar to running LESS clearance in normal tappet set up. |
The clearance makes NO difference to the timing. The only crucial thing is that there is enough preload to stop the plunger from hitting the snap ring; if it does this it will destroy the lifter quite quickly.
Quote:
|
Originally Posted by Sidecarbod Hi Guys,
The reason that I would like to understand how the clearance effects the valves is that I would rather ensure that the valves are fully closed and this would mean running LESS snap ring clearance unlike a normal setup which would require setting up at the larger end of the specified range.
I was thinking of going for 40 thou, my motor runs V8 Development stageIII heads with whatever springs they use and a typhoon cam. I think that some of my valves are over 60 thou at the moment |
As above. The clearance is not at all critical for hydraulic lifters. They automatically adjust themselves to zero clearance every time they pass over the cam base circle; it is not the same as setting tappet clearances for solid lifters.