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Mirek,
I am kind of at a disadvantage. The engine I have is assembled from
parts from many engines. Nothing is original to anything in the engine.
The head came off a 100M that had a bent valve, so there is one valve guide
that is larger in diameter than the other seven. Even the two rear main
caps are from another engine. I did have it line bored. Where I would get
an original cam I don't know. The best I can do is have the cam lobes
hardened by the people that ground it for me. (they were not hardened when
it was ground originally) and use the OEM tappets I have on order. After
that, carefully break it in. I appreciate your input.
Mike MacLean
On Wed, May 24, 2023 at 6:42=E2=80=AFAM <m.g.sharp@sympatico.ca> wrote:
> Mike, I am really no expert on this, but having had cam/tappet issues wit=
h
> my =E2=80=9956 BSA motorcycle (same technology as a Healey) in the past I=
did look
> into it about 18 years ago, and Mike Salter and I had a long discussion
> about cams and tappets when we did my BT7 engine a few years ago. One
> thing I was told by a bike engine builder I trust is that the hardness of
> the cam lobes and the tappets should be the same. If they are mis-matche=
d,
> rapid wear can occur. It *may* (I am speculating) not be so much that
> the cam or the tappets are not hardened properly, it is just that they ar=
e
> hardened *differently*. I eventually ordered the motorcycle cam and
> tappets from the same source with the promise that they were made to work
> together. That seemed to work on the bike. I think buying a cam and
> tappets from different sources is not the best idea.
>
>
>
> With my BT7, we were lucky, as even after over 100.000 miles, the cam had
> virtually no wear, and only one tappet showed signs of wear, so that was
> replaced with an good used original one that Mike had. So my original ca=
m
> and 11 of the tappets were re-used (with the tappets put back in the same
> order as they came out). Only 2000 miles on the engine, so jury is still
> out on that, but I just checked the tappet clearances and so far no sign=
s
> of wear. I am surprised that Ahead4Healeys actually have NOS tappets. A=
re
> you sure that they are not re-manufactured? If they are actually NOS, I
> would be inclined to use them and find a good original cam to use with th=
em
> (assuming the original one you have is too worn to re-use). The fact tha=
t
> my original parts were fine after 100,000 miles are a testament to the
> quality of the original parts. Mind you, I am only the second owner of t=
he
> car, and I knew the first owner well, and we both performed regular
> maintenance; that is key to longevity.
>
>
>
> Also, I don=E2=80=99t know what you are doing with valve springs and rock=
er gear.
> Remember whenever you deviate from stock, there are repercussions. Highe=
r
> lift cams, increased spring pressure, etc., all excerpt additional stress=
es
> on cam lobes and tappets.
>
>
>
> Good luck with it =E2=80=93 these are hard decisions when re-building and=
there is
> so much mythology about cams and tappets to sift through. My personal
> approach is use original parts whenever I can =E2=80=93 they work and the=
y last!
>
>
>
> Cheers, Mirek
>
>
>
> *From:* Healeys <healeys-bounces@autox.team.net> *On Behalf Of *Michael
> MacLean
> *Sent:* Wednesday, May 24, 2023 8:42 AM
> *To:* Ahealey help <healeys@autox.team.net>
> *Subject:* [Healeys] Denis Welch Tappets Again
>
>
>
> 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 wit=
h
> the installed Welch tappets recently. Now, searching the archives, I fi=
nd
> 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? Wh=
y
> 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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<div dir=3D"ltr"><div>Mirek,</div><div>=C2=A0=C2=A0=C2=A0=C2=A0 I am kind o=
f at a disadvantage.=C2=A0 The engine I have is assembled from parts from m=
any engines.=C2=A0 Nothing is original to anything in the engine.=C2=A0 The=
head came off a 100M that had a bent valve, so there is one valve guide th=
at is larger in diameter than the other seven.=C2=A0 Even the two rear main=
caps are from another engine.=C2=A0 I did have it line bored.=C2=A0 Where =
I would get an original cam I don't know.=C2=A0 The best I can do is ha=
ve the cam lobes hardened by the people that ground it for me. (they were n=
ot hardened when it was ground originally) and use the OEM tappets I have o=
n order.=C2=A0 After that, carefully break it in. I appreciate your input.<=
/div><div>Mike MacLean<br></div></div><br><div class=3D"gmail_quote"><div d=
ir=3D"ltr" class=3D"gmail_attr">On Wed, May 24, 2023 at 6:42=E2=80=AFAM <=
;<a href=3D"mailto:m.g.sharp@sympatico.ca";>m.g.sharp@sympatico.ca</a>> w=
rote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0p=
x 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class=
=3D"msg-4535351761475103876"><div style=3D"overflow-wrap: break-word;" lang=
=3D"EN-CA"><div class=3D"m_-4535351761475103876WordSection1"><p class=3D"Ms=
oNormal"><span>Mike, I am really no expert on this, but having had cam/tapp=
et issues with my =E2=80=9956 BSA motorcycle (same technology as a Healey) =
in the past I did look into it about 18 years ago, and Mike Salter and I ha=
d a long discussion about cams and tappets when we did my BT7 engine a few =
years ago.=C2=A0 One thing I was told by a bike engine builder I trust is t=
hat the hardness of the cam lobes and the tappets should be the same.=C2=A0=
If they are mis-matched, rapid wear can occur.=C2=A0 It <u>may</u> (I am s=
peculating) not be so much that the cam or the tappets are not hardened pro=
perly, it is just that they are hardened <u>differently</u>. =C2=A0=C2=A0I =
eventually ordered the motorcycle cam and tappets from the same source with=
the promise that they were made to work together.=C2=A0 That seemed to wor=
k on the bike.=C2=A0 I think buying a cam and tappets from different source=
s is not the best idea.=C2=A0 <u></u><u></u></span></p><p class=3D"MsoNorma=
l"><span><u></u>=C2=A0<u></u></span></p><p class=3D"MsoNormal"><span>With m=
y BT7, we were lucky, as even after over 100.000 miles, the cam had virtual=
ly no wear, and only one tappet showed signs of wear, so that was replaced =
with an good used original one that Mike had.=C2=A0 So my original cam and =
11 of the tappets were re-used (with the tappets put back in the same order=
as they came out).=C2=A0 Only 2000 miles on the engine, so jury is still o=
ut on that, but I just checked=C2=A0 the tappet clearances and so far no si=
gns of wear.=C2=A0 I am surprised that Ahead4Healeys actually have NOS tapp=
ets.=C2=A0 Are you sure that they are not re-manufactured?=C2=A0 If they ar=
e actually NOS, I would be inclined to use them and find a good original ca=
m to use with them (assuming the original one you have is too worn to re-us=
e).=C2=A0 The fact that my original parts were fine after 100,000 miles are=
a testament to the quality of the original parts.=C2=A0 Mind you, I am onl=
y the second owner of the car, and I knew=C2=A0 the first owner well, and w=
e both performed regular maintenance; that is key to longevity.<u></u><u></=
u></span></p><p class=3D"MsoNormal"><span><u></u>=C2=A0<u></u></span></p><p=
class=3D"MsoNormal"><span>Also, I don=E2=80=99t know what you are doing wi=
th valve springs and rocker gear.=C2=A0 Remember whenever you deviate from =
stock, there are repercussions.=C2=A0 Higher lift cams, increased spring pr=
essure, etc., all excerpt additional stresses on cam lobes and tappets.<u><=
/u><u></u></span></p><p class=3D"MsoNormal"><span><u></u>=C2=A0<u></u></spa=
n></p><p class=3D"MsoNormal"><span>Good luck with it =E2=80=93 these are ha=
rd decisions when re-building and there is so much mythology about cams and=
tappets to sift through.=C2=A0 My personal approach is use original parts =
whenever I can =E2=80=93 they work and they last!<u></u><u></u></span></p><=
p class=3D"MsoNormal"><span><u></u>=C2=A0<u></u></span></p><p class=3D"MsoN=
ormal"><span>Cheers, Mirek<u></u><u></u></span></p><p class=3D"MsoNormal"><=
span><u></u>=C2=A0<u></u></span></p><div style=3D"border-color:rgb(225,225,=
225) currentcolor currentcolor;border-style:solid none none;border-width:1p=
t medium medium;padding:3pt 0cm 0cm"><p class=3D"MsoNormal"><b><span lang=
=3D"EN-US">From:</span></b><span lang=3D"EN-US"> Healeys <<a href=3D"mai=
lto:healeys-bounces@autox.team.net" target=3D"_blank">healeys-bounces@autox=
.team.net</a>> <b>On Behalf Of </b>Michael MacLean<br><b>Sent:</b> Wedne=
sday, May 24, 2023 8:42 AM<br><b>To:</b> Ahealey help <<a href=3D"mailto=
:healeys@autox.team.net" target=3D"_blank">healeys@autox.team.net</a>><b=
r><b>Subject:</b> [Healeys] Denis Welch Tappets Again<u></u><u></u></span><=
/p></div><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p><div><div><p class=
=3D"MsoNormal">As I get closer to starting my 100 engine I have yet to repl=
ace the modified Denis Welch tappets like a list member suggested 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 ar=
chives, 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 supposed to do now?=C2=
=A0 Should I just buy aftermarket tappets?=C2=A0 Are the aftermarket tappet=
s hardened correctly?=C2=A0 Why wouldn't the NOS tappets be hardened ri=
ght?=C2=A0 I don't want to replace the cam after I get this thing runni=
ng.<u></u><u></u></p></div><div><p class=3D"MsoNormal">Mike MacLean<u></u><=
u></u></p></div></div></div></div></div></blockquote></div>
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