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Mike, I am really no expert on this, but having had cam/tappet 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 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-matched, 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 are 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. =20
=20
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 cam 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 signs of wear. I am surprised that =
Ahead4Healeys actually have NOS tappets. Are 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 them (assuming the =
original one you have is too worn to re-use). The fact that 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 the car, =
and I knew the first owner well, and we both performed regular =
maintenance; that is key to longevity.
=20
Also, I don=E2=80=99t know what you are doing with valve springs and =
rocker gear. Remember whenever you deviate from stock, there are =
repercussions. Higher lift cams, increased spring pressure, etc., all =
excerpt additional stresses on cam lobes and tappets.
=20
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 they last!
=20
Cheers, Mirek
=20
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
=20
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 =
with the installed Welch tappets recently. Now, searching the archives, =
I find 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? Why 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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vlink=3Dpurple style=3D'word-wrap:break-word'><div =
class=3DWordSection1><p class=3DMsoNormal><span =
style=3D'mso-fareast-language:EN-US'>Mike, I am really no expert on =
this, but having had cam/tappet 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 had 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 that 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 =
speculating) not be so much that the cam or the tappets are not hardened =
properly, 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 work on the bike.=C2=A0 I think buying a cam and tappets =
from different sources is not the best idea.=C2=A0 =
<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'mso-fareast-language:EN-US'><o:p> </o:p></span></p><p =
class=3DMsoNormal><span style=3D'mso-fareast-language:EN-US'>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.=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 out on that, but I just checked=C2=A0 the =
tappet clearances and so far no signs of wear.=C2=A0 I am surprised that =
Ahead4Healeys actually have NOS tappets.=C2=A0 Are you sure that they =
are not re-manufactured?=C2=A0 If they are actually NOS, I would be =
inclined to use them and find a good original cam to use with them =
(assuming the original one you have is too worn to re-use).=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 =
only the second owner of the car, and I knew=C2=A0 the first owner well, =
and we both performed regular maintenance; that is key to =
longevity.<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'mso-fareast-language:EN-US'><o:p> </o:p></span></p><p =
class=3DMsoNormal><span style=3D'mso-fareast-language:EN-US'>Also, I =
don=E2=80=99t know what you are doing with valve springs and rocker =
gear.=C2=A0 Remember whenever you deviate from stock, there are =
repercussions.=C2=A0 Higher lift cams, increased spring pressure, etc., =
all excerpt additional stresses on cam lobes and =
tappets.<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'mso-fareast-language:EN-US'><o:p> </o:p></span></p><p =
class=3DMsoNormal><span style=3D'mso-fareast-language:EN-US'>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.=C2=A0 My =
personal approach is use original parts whenever I can =E2=80=93 they =
work and they last!<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'mso-fareast-language:EN-US'><o:p> </o:p></span></p><p =
class=3DMsoNormal><span style=3D'mso-fareast-language:EN-US'>Cheers, =
Mirek<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'mso-fareast-language:EN-US'><o:p> </o:p></span></p><div =
style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><p class=3DMsoNormal><b><span =
lang=3DEN-US>From:</span></b><span lang=3DEN-US> Healeys =
<healeys-bounces@autox.team.net> <b>On Behalf Of </b>Michael =
MacLean<br><b>Sent:</b> Wednesday, May 24, 2023 8:42 AM<br><b>To:</b> =
Ahealey help <healeys@autox.team.net><br><b>Subject:</b> [Healeys] =
Denis Welch Tappets Again<o:p></o:p></span></p></div><p =
class=3DMsoNormal><o:p> </o:p></p><div><div><p class=3DMsoNormal>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 with the installed Welch tappets recently. Now, searching the =
archives, I find 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? Why wouldn't the NOS =
tappets be hardened right? I don't want to replace the cam after I =
get this thing running.<o:p></o:p></p></div><div><p =
class=3DMsoNormal>Mike =
MacLean<o:p></o:p></p></div></div></div></body></html>
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