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I was going to suggest a 'gun-drilled' cam from DWM, but it appears they
don't make them for the 4-cyl cars. Putting extra oil on the wear
surfaces has to be a good thing.
On 8/5/2021 5:39 AM, Michael Salter wrote:
> The first sign of problems was having to adjust the tappets which had
> initially been silent after 2000 miles and then again at 4500.
> After adjusting they were still audible and had previously been silent.
> Then at the 2000 and 4000 mile oil changes there was "fir" in the
> drain plug magnet.
> I'm very disappointed to have destroyed a very low mileage "M" cam and
> a set of NOS lifters that I had been saving for decades.
> I'm seriously considering having silicon nitride lifters manufactured
> but at over $1000 a set its a serious investment.
>
> M
>
> On Wed., Aug. 4, 2021, 10:47 a.m. Steven Kingsbury,
> <airtightproductions@icloud.com
>
> I just rebuilt my 100 engine and purchased my lifters from AH
> Spares in the UK. These were their new design for better oil flow.
> I now have 1000 miles or so on the new engine and once I got my
> problems figured out with my distributor, the car is running well
> and smooth.
> Â Â Â Now I'm wondering when the other shoe is going to drop! What
> problems did you have pointing you to the lifters as the source of
> those problems? When I retorqued the head, I readjusted the
> rockers and found no problems. They were a little off, but I
> expected a little.
> Â Â Â What should I be looking for? I used Driven Break In oil and
> then I switched to VR1 like you after 500 miles. I have been
> driving the car to build up some trust in it and it's turning in
> to a joy to drive. I've got M mods on this engine, cam, H6 carbs,
> M pistons and these new lifters. So far, so good.
> Â Â Â Thanks for your help,
> Steven Kingsbury
> BN1
>
> On August 3, 2021 at 5:19 PM, Michael Salter via Healeys
>
>> After only 6000 miles the NOS BMC lifters that I installed in my
>> engine with a very low mileage "M" cam have started to deteriorate.
>> This engine has had a steady diet of VR1 non synthetic and it has
>> had 4 changes in 6K miles.
>> Very disappointing.
>> I'm considering trying bucket type Buick lifters with longer
>> push rods and a new cam.
>> Does anyone have experience with the durability of the old Buick
>> lifters ... getting a little desperate here.
>> Fortunately I caught this issue before it ruined the engine.
>>
>> M
>>
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I was going to suggest a 'gun-drilled' cam from DWM, but it appears
they don't make them for the 4-cyl cars. Putting extra oil on the
wear surfaces has to be a good thing.<br>
<br>
<br>
<div class="moz-cite-prefix">On 8/5/2021 5:39 AM, Michael Salter
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAB3i7L+s-sAKSef5ZMCoVJ17Y2Yqu8a4ewvLkEDmqzTay4TxSQ@mail.gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div dir="auto">The first sign of problems was having to adjust
the tappets which had initially been silent after 2000 miles and
then again at 4500.
<div dir="auto">After adjusting they were still audible and had
previously been silent.</div>
<div dir="auto">Then at the 2000 and 4000 mile oil changes there
was "fir" in the drain plug magnet.</div>
<div dir="auto">I'm very disappointed to have destroyed a very
low mileage "M" cam and a set of NOS lifters that I had been
saving for decades.</div>
<div dir="auto">I'm seriously considering having silicon nitride
lifters manufactured but at over $1000 a set its a serious
investment.</div>
<div dir="auto"><br>
</div>
<div dir="auto">M</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Wed., Aug. 4, 2021, 10:47
a.m. Steven Kingsbury, <<a
href="mailto:airtightproductions@icloud.com";
moz-do-not-send="true">airtightproductions@icloud.com</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div>
<div>I just rebuilt my 100 engine and purchased my lifters
from AH Spares in the UK. These were their new design for
better oil flow. I now have 1000 miles or so on the new
engine and once I got my problems figured out with my
distributor, the car is running well and smooth.</div>
<div>Â Â Â Now I'm wondering when the other shoe is going to
drop! What problems did you have pointing you to the
lifters as the source of those problems? When I retorqued
the head, I readjusted the rockers and found no problems.
They were a little off, but I expected a little.</div>
<div>Â Â Â What should I be looking for? I used Driven Break In
oil and then I switched to VR1 like you after 500 miles. I
have been driving the car to build up some trust in it and
it's turning in to a joy to drive. I've got M mods on this
engine, cam, H6 carbs, M pistons and these new lifters. So
far, so good. </div>
<div>Â Â Â Thanks for your help,</div>
<div>Steven Kingsbury</div>
<div>BN1</div>
<div><br>
On August 3, 2021 at 5:19 PM, Michael Salter via Healeys
<<a href="mailto:healeys@autox.team.net";
target="_blank" rel="noreferrer"
moz-do-not-send="true">healeys@autox.team.net</a>>
wrote:<br>
<br>
</div>
<div>
<blockquote type="cite">
<div>
<div dir="auto">After only 6000 miles the NOS BMC
lifters that I installed in my engine with a very
low mileage "M" cam have started to deteriorate.Â
<div dir="auto">This engine has had a steady diet of
VR1 non synthetic and it has had 4 changes in 6K
miles. </div>
<div dir="auto">Very disappointing. </div>
<div dir="auto">I'm considering trying bucket type
Buick lifters with longer push rods and a new cam.</div>
<div dir="auto">Does anyone have experience with the
durability of the old Buick lifters ... getting a
little desperate here.</div>
<div dir="auto">Fortunately I caught this issue
before it ruined the engine.</div>
<div dir="auto"><br>
</div>
<div dir="auto">M</div>
</div>
<br>
</div>
</blockquote>
</div>
</div>
</blockquote>
</div>
</blockquote>
<br>
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