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At the risk of awakening Godzilla from his dormancy I'll go ahead and say
the accursed letters: *ZDDP*!
Best--Michael Oritt
On Wed, May 24, 2023 at 10:34=E2=80=AFAM Michael Salter <michaelsalter@gmai=
l.com>
wrote:
> Speaking as someone who has over the years had 2 bouts of tappet failure
> in 100 engines I would suggest that you are wise to be cautious.
> I can't advise on the tappets that you have fitted but can say the I am
> now using sets from A H Spares which are proving to be very satisfactory
> and are different from those I have had problems with.
> I have, in B.#174, a magnetic oil drain plug and have found that to be a
> very good indicator of impending tappet failure. On the last 2 oil change=
s
> there was absolutely no metal on the plug.
> My procedure initial start procedure was to firstly remove the inner valv=
e
> springs as I have found that they and the additional pressure that they
> produce are just not required as my engine exhibits absolutely no sign of
> valve bounce right up to the red line.
> I use Lucas 20/50 break in oil for the 1st 500 miles.
> On first start I held the engine around 1500 RPM for about 20 minutes. (I
> have difficulty believing that this is necessary but that's what the
> experts recommend so you have to be sure that the cooling system is in go=
od
> shape).
> I change to VR1 non synthetic 20/50 after 500 odd miles and then change
> the oil every 3000 miles.
> The engine in B#174 now runs with absolutely NO tappet clatter which is
> pretty unusual for a 100.
> I recently checked the valve clearances and they were unchanged after 250=
0
> miles, another good indicator that the cam and tappets are holding up wel=
l.
> I'm sure others have had different experiences but I would recommend tha=
t
> you make every effort to avoid a cam/tappet failure because rectification
> requires a complete engine strip down.
> Good luck.
>
> M
> (Still running perfectly with outer springs only)
>
> On Wed., May 24, 2023, 8:46 a.m. Michael MacLean, <
> springer.mike51@gmail.com> wrote:
>
>> As I get closer to starting my 100 engine I have yet to replace the
>> modified Denis Welch tappets like a list member suggested I do. I got
>> nervous, so I ordered a set of NOS tappets from Ahead4Healeys to swap wi=
th
>> the installed Welch tappets recently. Now, searching the archives, I f=
ind
>> someone had problems with NOS lifters after 6000 miles. Ruined a cam and
>> the lifters. So, what am I supposed to do now? Should I just buy
>> aftermarket tappets? Are the aftermarket tappets hardened correctly? W=
hy
>> wouldn't the NOS tappets be hardened right? I don't want to replace the
>> cam after I get this thing running.
>> Mike MacLean
>> _______________________________________________
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>> _______________________________________________
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<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"color:#3333ff">At th=
e risk of awakening Godzilla from his dormancy I'll go ahead and say th=
e accursed letters:=C2=A0 <b><i><u>ZDDP</u></i></b>!</div><div class=3D"gma=
il_default" style=3D"color:#3333ff"><br></div><div class=3D"gmail_default" =
style=3D"color:#3333ff">Best--Michael Oritt</div></div><br><div class=3D"gm=
ail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Wed, May 24, 2023 at 10=
:34=E2=80=AFAM Michael Salter <<a href=3D"mailto:michaelsalter@gmail.com=
">michaelsalter@gmail.com</a>> wrote:<br></div><blockquote class=3D"gmai=
l_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,20=
4,204);padding-left:1ex"><div dir=3D"auto">Speaking as someone who has over=
the years had 2 bouts of tappet failure in 100 engines I would suggest tha=
t you are wise to be cautious.<div dir=3D"auto">I can't advise on the t=
appets that you have fitted but can say the I am now using sets from A H Sp=
ares which are proving to be very satisfactory and are different from those=
I have had problems with.</div><div dir=3D"auto">I have, in B.#174, a magn=
etic oil drain plug and have found that to be a very good indicator of impe=
nding tappet failure. On the last 2 oil changes there was absolutely no met=
al on the plug.</div><div dir=3D"auto">My procedure initial start procedure=
was to firstly remove the inner valve springs as I have found that they an=
d the additional pressure that they produce are just not required as my eng=
ine exhibits absolutely no sign of valve bounce right up to the red line.</=
div><div dir=3D"auto">I use Lucas 20/50 break in oil for the 1st 500 miles.=
=C2=A0</div><div dir=3D"auto">On first start I held the engine around 1500 =
RPM for about 20 minutes. (I have difficulty believing that this is necessa=
ry but that's what the experts recommend so you have to be sure that th=
e cooling system is in good shape).</div><div dir=3D"auto">I change to VR1 =
non synthetic 20/50 after 500 odd miles and then change the oil every 3000 =
miles.</div><div dir=3D"auto">The engine in B#174 now runs with absolutely =
NO tappet clatter which is pretty unusual for a 100.</div><div dir=3D"auto"=
>I recently checked the valve clearances and they were unchanged after 2500=
miles, another good indicator that the cam and tappets are holding up well=
.</div><div dir=3D"auto">I'm sure others have had different experiences=
but I=C2=A0 would recommend that you make every effort to avoid a cam/tapp=
et failure because rectification requires a complete engine strip down.</di=
v><div dir=3D"auto">Good luck.</div><div dir=3D"auto"><br></div><div dir=3D=
"auto">M</div><div dir=3D"auto">=C2=A0(Still running perfectly with outer s=
prings only)</div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" cla=
ss=3D"gmail_attr">On Wed., May 24, 2023, 8:46 a.m. Michael MacLean, <<a =
href=3D"mailto:springer.mike51@gmail.com"; target=3D"_blank">springer.mike51=
@gmail.com</a>> wrote:<br></div><blockquote class=3D"gmail_quote" style=
=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding=
-left:1ex"><div dir=3D"ltr"><div>As I get closer to starting my 100 engine =
I have yet to replace the modified Denis Welch tappets like a list member s=
uggested I do.=C2=A0 I got nervous, so I ordered a set of NOS tappets from =
Ahead4Healeys to swap with the installed Welch tappets recently.=C2=A0 Now,=
searching the archives, I=C2=A0 find someone had problems with NOS lifters=
after 6000 miles. Ruined a cam and the lifters.=C2=A0 So, what am I suppos=
ed to do now?=C2=A0 Should I just buy aftermarket tappets?=C2=A0 Are the af=
termarket tappets hardened correctly?=C2=A0 Why wouldn't the NOS tappet=
s be hardened right?=C2=A0 I don't want to replace the cam after I get =
this thing running.</div><div>Mike MacLean<br></div></div>
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