G'day
My first car was a BMC Morris Mini 850 and there have been a total of 7
BMC Minis in my life since then, ranging from relatively standard cars
to a fairly quick Cooper S. Thankfully I am now fully cured and they are
all just a memory.
However in a number of them I had a push-rod come adrift from the
rockers. Never caused any damage and it was just a matter of putting it
back together again. I will say that in every one of the bloody things I
also had valve problems and cracked cylinder heads.
There is something to be said for boring everyday Japanese cars.
Hoo Roo
Patrick Quinn
Sydney, Australia
1947 Healey Duncan Saloon
1954 Austin-Healey 100 BN3/1
-----Original Message-----
From: healeys-bounces@autox.team.net
[mailto:healeys-bounces@autox.team.net] On Behalf Of Robert Blair
Sent: Thursday, 16 October 2008 12:25 AM
To: healeys@autox.team.net; WILLIAM B LAWRENCE
Subject: Re: [Healeys] FW: Things that make you go Hmm!
Bill,
Never happened to me on a British push rod engine, but I would
rationalize
your failure as one of the following.... as your push rod was not bent
and the
cup/nothing was broken - I am assuming standard lifter and rocker
surfaces and
profiles:
1. The valve stuck open for enough time for the push rod to be floating
and
therefore side step the tapet
2. The aggressive ? cam profile you are using allowed the inertia of the
rod
and valve train to not immediate follow the profile - pretty unlikely
3. The push rod temporarily bent under stress at right rpm due to a
natural
frequency standing wave being set up in the rod but did not break - long
enough to pop out.
I would say that 1 is the most likely.
Robert N. Blair 65 Yellow BJ8 rnbmail@yahoo.com
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