Why valves do not float - what cracks retainers
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What I take from this is my BC dual springs with steel retainers will offer alittle pillow of protection, maybe a small buffer if I do something stupid. So to have my redline 9000 in Kpro is perfectly safe it seems.
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Do these findings suggest that, there are no issues of retainer/mechanical failure, valve float, valve to piston contact, etc up to 10700 rpm, ie 10000rpm could be run from a valvetrain standpoint on the oem ap1 internals? How would valve adjustment specs affect these numbers?
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When spinning a camshaft at 5500 rpms (the crankshaft speed it takes to split retainers, plus a few hundred) and using other controls...We were able to reproduce splitting retainers.
At this RPM, we were able to place a .030 plastic stint between the valve and the head at 5350rpm ...The valve did not cut the stint, it didnt leave a blemish.
The valve did not close. It was opened again by the cam before it would close all the way.
At this RPM, we were able to place a .030 plastic stint between the valve and the head at 5350rpm ...The valve did not cut the stint, it didnt leave a blemish.
The valve did not close. It was opened again by the cam before it would close all the way.
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Joined: Jul 2002
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From: Long Island, New York
Originally Posted by Billman250' timestamp='1359675865' post='22306511
9700 retainer split
10700 valve to piston contact
Nothing has changed
10700 valve to piston contact
Nothing has changed
When spinning a camshaft at 5500 rpms (the crankshaft speed it takes to split retainers, plus a few hundred) and using other controls...We were able to reproduce splitting retainers.
At this RPM, we were able to place a .030 plastic stint between the valve and the head at 5350rpm ...The valve did not cut the stint, it didnt leave a blemish.
The valve did not close. It was opened again by the cam before it would close all the way.
At this RPM, we were able to place a .030 plastic stint between the valve and the head at 5350rpm ...The valve did not cut the stint, it didnt leave a blemish.
The valve did not close. It was opened again by the cam before it would close all the way.
It takes about 4850 camshaft speed to split the retainers, or 9700 crankshaft speed. We set the machine to spin at 5500 to ensure the results we were after.
I have always stood by the fact that retainers split at 9700, and valve to piston contact happens at 10700. If I wrote differently somewhere, please alert me to it and I will change it.
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