Quote:
Originally Posted by MPKind
Jay. That’s some great information. I’ve re-read your post a few times. When you refer to “lash” with these V series lifters, it’s setting the max plunger travel from the bottom up. Right? Rhoads uses the term “adjustment” in their documents. They suggested 0.020” for street but in a general sense not knowing the cam profile. Ok. So with this cam I can tighten up to 0.008” on the intake and less on the exhaust? Say 0.004”? So the exhaust behaves like a solid lifter?
So the more plunger action the noisier they get. Rhoads sez that a bigger lash at 0.030 provides better idle. I suppose that’s true but it’s also noisier. What isn’t happening in my case is a full pump up to the point where they quiet
Next step is to change oil to see if that has any affect.
I have more questions but I’ll save those for tomorrow.
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I call it lash because I am a mechanical cam guy, maybe clearence is a less confusing description when following the instructions. With the plunger bottomed out you measure the distance (clearance) the plunger can move with a feeler gauge, it is like checking lash on a mechanical cam.
I was not referring to .008” for the intakes and setting .004” for the exhaust. Maybe I miss wrote the other post. I don’t know what your over all set up is, so I was intending to suggest for that aggressive cam start at .008” on both intakes and exhausts if you have iron heads, or .004” on both valves if you have Aluminum heads. Then if you desire more action from the lifters increase the adjustment on the intakes only, My reference to .004” was for if your engine has Aluminum heads. But yes you can set the exhaust to .004” and the intakes to .008”. If you want you can even bottom the plunger out so there is zero clearance cold, then it acts like a mechanical lifter. At .004” clearence set cold (with iron heads) once the engine warms up the V series lifters still gain around an 1” of vacuum over a normal lifter at idle. At .020” clearance the vacuum increase over a regular lifter is around 2.5” to 3”. At .030” they probably only gain .25” more vacuum than when set at .020”. They progressively do less as the clearence is increased.