Why valves do not float - what cracks retainers
Joined: Oct 2009
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From: Ontario Canada
^ Best bottles for sure, I think I have about 50 of them in my basement, including one big ass one. We re-use them to preserve our home-made spaghetti sauce each year, lol.
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Joined: Jun 2010
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From: Melbourne
I don't know why anyone would think this myth was true in the first place. For the valve to float for so long that the lobe could make an entire revolution to cause it to strike the top of the valve would be crazy. The valve spring should have guided it back onto the profile of the lobe before that occurred somewhere in the revolution of the lobe. Either that or the top of the piston would have smacked into the bottom of the valve. If you subject the assembly to an obscene amount of rpm of course the retainer is going to crack. The fact that it doesn't just snap is already an engineering marvel!
Thread Starter
Joined: Jan 2006
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From: 17 ft below sea level.
You're right about the font.
I wrote it in MSWord.
It pops up every now & then.
It also justifies the decision to just replace cracked retainers without checking the seats and guides, IOW replace retainers without removing the head.
Thread Starter
Joined: Jan 2006
Posts: 4,953
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From: 17 ft below sea level.
And some of it simply doesn't make sense because of the bad English. Like this:
Another thing about AP1 (early F20) retainers: they are not weak.A weak retainer would break in 2 pieces as soon as the crack is there.
So....a crack is there....but it's not "weak"....but it's cracked.....but it's not in two pieces [or three or four, or "quarters" (like in the beginning of the post, whatever that meant)]....so it's not weak....but it's cracked....don't get it....
Another thing about AP1 (early F20) retainers: they are not weak.A weak retainer would break in 2 pieces as soon as the crack is there.
So....a crack is there....but it's not "weak"....but it's cracked.....but it's not in two pieces [or three or four, or "quarters" (like in the beginning of the post, whatever that meant)]....so it's not weak....but it's cracked....don't get it....
Its clear.... you.... didn't get.... it.
And be so kind to point out the bad English.
But the valves have dropped slightly.....and some more so....and people have had toasted engines.....so what are AP1's subjected to that AP2's aren't?
Valves do not drop - not even slighty - because of cracked retainers.
A cracked retainer moves up the valve stem.
Oh well...
edit: typo.
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Joined: Nov 2003
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From: Magnolia, TX
Thanks for posting Spitfire. I always enjoy your posts, but don't always agree. I do wish I had taken a ME class or two in college though. You're over my head most of the time!
BTW- your English writing skills are better than 99% of Americans!
BTW- your English writing skills are better than 99% of Americans!
Joined: Jan 2011
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From: Long Island
And you don't need to take college classes to learn something. If you math and physics are solid, you can start learning statics on your own.
http://ocw.mit.edu/courses/mechanica...s-i-fall-2006/
http://emweb.unl.edu/NEGAHBAN/EM223/Intro.htm
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Joined: Dec 2007
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From: Raleigh, NC
So it is float? The spring isn't strong enough to follow the cam back up and hits hard? It makes sense that a springs spring rate can be overpowered and a small delay on return will be added from inertia. I'm surprised people would think the valve could float an entire revolution though.
Joined: Aug 2011
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What should I tell honda to check for? All I know so far is "order these for me and change them during the valve adjustment - on the intake side"
14765-PRB-A01 8 retainers
14781-PCX-004 16 cotters
What else should I tell them?
14765-PRB-A01 8 retainers
14781-PCX-004 16 cotters
What else should I tell them?
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Joined: Apr 2012
Posts: 648
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From: Texas
Good read sir! I've read a lot about the subject/myth and have been saving to replace the valve springs and retainers for my next big maintenance project ( albeit using some nice aftermarket goodies over the oem prospects). LOL @ the dude citing him for grammatical errors and then goes onto have a plethora of discrepancies in his own sentence.