Rocker arm recommendations?
B3,
I'm 'delusional'? Your quote in post 80 where you make this claim about what I supposedly said is ACTUALLY A QUOTE FROM YOUR POST IN POST 67, not mine.
Whose delusional.
Your post #80: 'There is a straight line through the pushrod & the centre of the adjuster radius'. Huh? How does a radius become a straight line?
Also in post #80: '....it would be impossible for the manufacturer to design a specific rocker ratio, so all those rockers advertised with a ratio is a lie'.
The ratio is a nominal ratio. The actual ratio can & does vary throughout the lift cycle. The Crane quick lifts are but one example. David Vizard's testing shows this in a number of ways. Not one of the 24 rockers tested produced the advertised ratio by using the formula of total valve divided by total lobe lift. He calls it the overall ratio ratio; another term would be the average ratio. Average because the ratio varies through the cycle; & somewhere in the cycle, dividing the valve lift by the amount of lobe lift gives the advertised ratio.
You do not seem to understand even the basics.
I fixed the one quote that I accidently forgot to put my name in. I figured you would know the difference. Wrong again, apparently. Btw,
whose delusional? It's not my delusional. Maybe it's Jim's delusional, or Yellow Rose's delusional. I know! It's RRR's delusional. He's right proud of his delusional, too. Now,
who's delusional? That would still be you.
Just like anything that rotates on the outer edge of a true radius, it revolves around the center and maintains a straight line with the axis. Melbourne and Brisbane and Perth and Sydney are all at different locations on the radius of the Earth, but (adjusting for topical elevation variations) they all are the same distance from the Earth's axis, and rotate around it. It doesn't matter whether it is daytime, or nighttime, it's still the same distance from the center. The pushrod centerline revolves around the center of the adjuster pivot axis, so even though it is at a different point on the radius, it is still directly in line with the axis or center. One only has to observe the pushrod in action to recognize this.
I know what a nominal ratio is. Remember, I do have my own design made by T&D. But, your idea of a nominal ratio is like taking the rocker designer outside, in the dark, blindfolded, spun in a circle until dizzy, handed a gun, and told to shoot a flea off a dog's nose in the next town over. You said "somewhere in the cycle", like ratio-ing rockers is akin to a Chinese auction. Buy them, and then find out what you got.
The setup has a lot to do with the losses of valve lift. Rocker geometry will play a huge role in how much wasted motion is in the system. I know an engine builder who puts a ridiculously short pushrod in his lift rule engines to pass tech, and then swaps them to longer pushrods for the race. He reduced the lift by inducing way more wasted motion into the system. Does that mean the rocker changed it's length, or ratio. No, the rocker was already designed and manufactured. It didn't experience some magic or miracle. It experienced a user manipulating it's function. The roller position didn't get any further from the fulcrum centerline, and neither did the adjuster. I already see you disagreeing, so tell me. If you rotate that rocker until the roller is directly below the fulcrum centerline, what is the ratio, and did the valve side lever completely disappear since it now has zero length, according to your logic?
