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I went the band-aid route on my TR3 for the same reason.=C2=A0 But the rig=
ht way is to get a machinist to shorten the pushrods.=C2=A0 BPNW sells shor=
t rods for the TR6/SC engine but at that time they didn't have any for the =
wet-sleeve engine.
=20
Dave=20
=20
=20
-----Original Message-----
From: Cliff Hansen <cliff_hansen@outlook.com>
To: list Triumph <triumphs@autox.team.net>
Sent: Wed, Apr 7, 2021 4:23 pm
Subject: [TR] Advice on high compression head
<!--#yiv4309632913 _filtered {} _filtered {}#yiv4309632913 #yiv4309632913 =
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v4309632913MsoChpDefault {} _filtered {}#yiv4309632913 div.yiv4309632913Wor=
dSection1 {}-->The telenovela =E2=80=9CWhat=E2=80=99s going on with this 4A=
cylinder head=E2=80=9D has developed a new plot twist. =C2=A0 The head, af=
ter cleanup, measures 3.21=E2=80=9D from bottom to the surface for the valv=
e cover gasket. Stock is 3.330 (if I got the number correctly). Some PO cut=
0.11 off, because only 0.010=E2=80=9D was removed in this round of clean u=
p. Now I can see an explanation for the persistent pinging I=E2=80=99ve dea=
lt with over the last few years (head has been milled so compression is hig=
h, material near intake valves has been thinned, increasing likelihood of h=
ot spots =E2=80=93 I=E2=80=99m getting this from Kastner=E2=80=99s preparat=
ion book), which I had thought was due to leaking intakes, carb shafts, or =
operating at higher altitude. =C2=A0 As is, I can=E2=80=99t use this head =
because there is not enough slack in the valve train to give 0.010=E2=80=9D=
clearance on several valves. I didn=E2=80=99t notice before, but now that =
I am looking, all the valve adjusters were nearly backed out all the way. =
=C2=A0 Looking for advice from the list: is there any reasonable way to use=
this head?- I=E2=80=99d prefer to reduce compression but don=E2=80=99t see=
any reasonable way to accomplish that. I called GasketWorks and he gently =
discouraged me from getting a custom thick head gasket, saying instead I=E2=
=80=99d be better off finding a head which had not been milled so much. =C2=
=A0- Shimming the rocker pedestals to get valve clearance feels like a band=
aid which certainly won=E2=80=99t address the pinging (assuming that the pi=
nging is a result of the shortened head). =C2=A0 Would appreciate any advic=
e on the way forward. =C2=A0 Cliff =C2=A0 Sent from Mail for Windows 10 =C2=
=A0 ** triumphs@autox.team.net **
Archive: http://www.team.net/pipermail/triumphs http://www.team.net/archiv=
e
sey@cs.com
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<div style=3D"color:black;font: 12pt Arial, Helvetica, sans-serif;">
<div> <font size=3D"3">I went the band-aid route on my TR3 for the same rea=
son. But the right way is to get a machinist to shorten the pushrods.=
BPNW sells short rods for the TR6/SC engine but at that time they di=
dn't have any for the wet-sleeve engine.</font><br>
</div>
<div> <br>
</div>
<div style=3D"clear:both"><font size=3D"4">Dave </font><br>
<br>
</div>
<div> <br>
</div>
<div> <br>
</div>
<div style=3D"font-family:arial,helvetica;font-size:10pt;color:black"><font=
size=3D"2">-----Original Message-----<br>
From: Cliff Hansen <cliff_hansen@outlook.com><br>
To: list Triumph <triumphs@autox.team.net><br>
Sent: Wed, Apr 7, 2021 4:23 pm<br>
Subject: [TR] Advice on high compression head<br>
<br>
<div id=3D"yiv4309632913">
=20
=20
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<div>
<div class=3D"yiv4309632913WordSection1">
<div class=3D"yiv4309632913MsoNormal">The telenovela =E2=80=9CWhat=E2=80=99=
s going on with this 4A cylinder head=E2=80=9D has developed a new plot twi=
st.</div>
<div class=3D"yiv4309632913MsoNormal"> </div>
=20
<div class=3D"yiv4309632913MsoNormal">The head, after cleanup, measures 3.2=
1=E2=80=9D from bottom to the surface for the valve cover gasket. Stock is =
3.330 (if I got the number correctly). Some PO cut 0.11 off, because only 0=
.010=E2=80=9D was removed in this round of clean up. Now I can see
an explanation for the persistent pinging I=E2=80=99ve dealt with over the=
last few years (head has been milled so compression is high, material near=
intake valves has been thinned, increasing likelihood of hot spots =E2=80=
=93 I=E2=80=99m getting this from Kastner=E2=80=99s preparation book),
which I had thought was due to leaking intakes, carb shafts, or operating =
at higher altitude.</div>
=20
<div class=3D"yiv4309632913MsoNormal"> </div>
=20
<div class=3D"yiv4309632913MsoNormal">As is, I can=E2=80=99t use this head =
because there is not enough slack in the valve train to give 0.010=E2=80=9D=
clearance on several valves. I didn=E2=80=99t notice before, but now that =
I am looking, all the valve adjusters were nearly backed out all the way.</=
div>
<div class=3D"yiv4309632913MsoNormal"> </div>
=20
<div class=3D"yiv4309632913MsoNormal">Looking for advice from the list: is =
there any reasonable way to use this head?</div>
<div class=3D"yiv4309632913MsoNormal">- I=E2=80=99d prefer to reduce compre=
ssion but don=E2=80=99t see any reasonable way to accomplish that. I called=
GasketWorks and he gently discouraged me from getting a custom thick head =
gasket, saying instead I=E2=80=99d be better off finding a head which had
not been milled so much. </div>
<div class=3D"yiv4309632913MsoNormal"> - Shimming the rocker pedestals=
to get valve clearance feels like a bandaid which certainly won=E2=80=99t =
address the pinging (assuming that the pinging is a result of the shortened=
head).</div>
<div class=3D"yiv4309632913MsoNormal"> </div>
=20
<div class=3D"yiv4309632913MsoNormal">Would appreciate any advice on the wa=
y forward.</div>
<div class=3D"yiv4309632913MsoNormal"> </div>
=20
<div class=3D"yiv4309632913MsoNormal">Cliff</div>
<div class=3D"yiv4309632913MsoNormal"> </div>
=20
<div class=3D"yiv4309632913MsoNormal">Sent from <a rel=3D"nofollow noopener=
noreferrer" target=3D"_blank" href=3D"https://go.microsoft.com/fwlink/?Lin=
kId=3D550986">
Mail</a> for Windows 10</div>
<div class=3D"yiv4309632913MsoNormal"> </div>
=20
</div>
</div>
</div>
** <a ymailto=3D"mailto:triumphs@autox.team.net"; href=3D"mailto:triumphs@au=
tox.team.net">triumphs@autox.team.net</a> **<br>
<br>
//www.team.net/donate.html</a><br>
Archive: <a href=3D"http://www.team.net/pipermail/triumphs"; target=3D"_blan=
k">http://www.team.net/pipermail/triumphs </a> <a href=3D"http://www.team.n=
et/archive" target=3D"_blank">http://www.team.net/archive</a><br>
<br>
hs/dave1massey@cs.com" target=3D"_blank">http://autox.team.net/mailman/opti=
ons/triumphs/dave1massey@cs.com</a><br>
</font></div>
</div>
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** triumphs@autox.team.net **
Archive: http://www.team.net/pipermail/triumphs http://www.team.net/archive
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