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Don, Interesting about the dates for the intro of unleaded fuel. I remember a=
t the end of my Apprenticeship at Jaguar in 1966 being asked by American own=
ers collecting their new E Types about fuel options while travelling in Euro=
pe. Should it be leaded or unleaded? I=E2=80=99d never heard of unleaded up t=
o that point, so usually said =E2=80=9C use any brand with =E2=80=9Csuper=E2=
=80=9D in its name as it will be between 99 and 105 octane RM=E2=80=9D. As C=
alifornia seemed to have the lions share of pollution, did unleaded start th=
ere and slowly spread across the country?=20
But back in that time, I clearly remember the many processes in assembling t=
he XK engine. Inlet valve seats were a dull but clean steel colour while the=
exhaust seats were a very dark brown, while cutting the seat face was done f=
ar slower for the exhaust than for the inlet.
Do wish I=E2=80=99d paid more attention at the time and asked =E2=80=9Cwhy?=E2=
=80=9D a lot more than I did. Just can=E2=80=99t remember things as clearly a=
s years ago.
Jonmac
> On 23 Oct 2024, at 17:24, Don Hiscock <don.hiscock@gmail.com> wrote:
>=20
> I=E2=80=99ve never heard that bit about satellite seats, John, but it=E2=80=
=99s certainly possible.=20
>=20
> My recollection is that unleaded fuel first started becoming available in A=
merica circa 1973-75 and it became dominant in the 1980s. It=E2=80=99s hard t=
o imagine engineering changes by the British motor industry being made in th=
e 1960s for unleaded gasoline in the USA. Later on, perhaps.=20
>=20
>> On Wednesday, October 23, 2024, John Macartney <johnbmacartney@gmx.com> w=
rote:
>> Does anyone out there have documentary evidence (in the form of Service B=
ulletins issued by the factory or Leona NJ) that makes specific mention of t=
he introduction of stellite valve seats in place of earlier and softer alter=
natives? I do recall BMC making something of a hoo-haa about stellite seats b=
eing used in the MGB and Healey 3000 back in the sixties. Same applied to Ro=
otes Group and Jaguar.
>> There is hearsay in the UK that hardened seats went into heads for the US=
market at about the same time because of the introduction of unleaded fuel.=
That hearsay also suggests hardened seats were territory specific but from a=
n ease of production standpoint, having two different types of seat during m=
achining and manufacture just doesn=E2=80=99t make sense. I can think of oth=
er examples where Standard-Triumph adopted a =E2=80=9Cone type fits all=E2=80=
=9D applied and that goes for other British makes.
>> It=E2=80=99s clear that valve seat recession fears in Europe has been a k=
neejerk reaction to a problem that never really existed which suggests stell=
ite valve seats were fitted for all markets. An engineering or service bulle=
tin back in the day would have confirmed this but I never remember seeing on=
e. Thoughts anyone?
>>=20
>> Jonmac
>> ** triumphs@autox.team.net **
>>=20
>> Donate: http://www.team.net/donate.html
>> Archive: http://www.team.net/pipermail/triumphs http://www.team.net/arch=
ive
>>=20
>> Unsubscribe/Manage: http://autox.team.net/mailman/options/triumphs/don.hi=
scock@gmail.com
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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto"><div dir=3D"ltr"></div><div dir=3D"ltr">Don=
, Interesting about the dates for the intro of unleaded fuel. I remember at t=
he end of my Apprenticeship at Jaguar in 1966 being asked by American owners=
collecting their new E Types about fuel options while travelling in Europe.=
Should it be leaded or unleaded? I=E2=80=99d never heard of unleaded up to t=
hat point, so usually said =E2=80=9C use any brand with =E2=80=9Csuper=E2=80=
=9D in its name as it will be between 99 and 105 octane RM=E2=80=9D. As Cali=
fornia seemed to have the lions share of pollution, did unleaded start there=
and slowly spread across the country? </div><div dir=3D"ltr">But back i=
n that time, I clearly remember the many processes in assembling the XK engi=
ne. Inlet valve seats were a dull but clean steel colour while the exhaust s=
eats were a very dark brown, while cutting the seat face was done far slower=
for the exhaust than for the inlet.</div><div dir=3D"ltr">Do wish I=E2=80=99=
d paid more attention at the time and asked =E2=80=9Cwhy?=E2=80=9D a lot mor=
e than I did. Just can=E2=80=99t remember things as clearly as years ago.</d=
iv><div dir=3D"ltr"><br></div><div dir=3D"ltr">Jonmac</div><div dir=3D"ltr">=
<br>On 23 Oct 2024, at 17:24, Don Hiscock <<a href=3D"mailto:don.hiscock@=
gmail.com">don.hiscock@gmail.com</a>> wrote:<br><br></div><blockquote typ=
e=3D"cite"><div dir=3D"ltr">I=E2=80=99ve never heard that bit about satellit=
e seats, John, but it=E2=80=99s certainly possible. <div><br></div><div=
>My recollection is that unleaded fuel first started becoming available in A=
merica circa 1973-75 and it became dominant in the 1980s. It=E2=80=99s hard t=
o imagine engineering changes by the British motor industry being made in th=
e 1960s for unleaded gasoline in the USA. Later on, perhaps. <br><br>On=
Wednesday, October 23, 2024, John Macartney <<a href=3D"mailto:johnbmaca=
rtney@gmx.com">johnbmacartney@gmx.com</a>> wrote:<br><blockquote class=3D=
"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-=
left:1ex">Does anyone out there have documentary evidence (in the form of Se=
rvice Bulletins issued by the factory or Leona NJ) that makes specific menti=
on of the introduction of stellite valve seats in place of earlier and softe=
r alternatives? I do recall BMC making something of a hoo-haa about stellite=
seats being used in the MGB and Healey 3000 back in the sixties. Same appli=
ed to Rootes Group and Jaguar.<br>
There is hearsay in the UK that hardened seats went into heads for the US ma=
rket at about the same time because of the introduction of unleaded fuel. Th=
at hearsay also suggests hardened seats were territory specific but from an e=
ase of production standpoint, having two different types of seat during mach=
ining and manufacture just doesn=E2=80=99t make sense. I can think of other e=
xamples where Standard-Triumph adopted a =E2=80=9Cone type fits all=E2=80=9D=
applied and that goes for other British makes.<br>
It=E2=80=99s clear that valve seat recession fears in Europe has been a knee=
jerk reaction to a problem that never really existed which suggests stellite=
valve seats were fitted for all markets. An engineering or service bulletin=
back in the day would have confirmed this but I never remember seeing one. T=
houghts anyone?<br>
<br>
Jonmac<br>
** <a href=3D"mailto:triumphs@autox.team.net";>triumphs@autox.team.net</a> **=
<br>
<br>
/www.team.net/donate.<wbr>html</a><br>
Archive: <a href=3D"http://www.team.net/pipermail/triumphs"; target=3D"_blank=
">http://www.team.net/pipermail/<wbr>triumphs</a> <a href=3D"http://ww=
w.team.net/archive" target=3D"_blank">http://www.team.net/archive</a><br>
<br>
s/don.hiscock@gmail.com" target=3D"_blank">http://autox.team.net/mailman/<wb=
r>options/triumphs/don.hiscock@<wbr>gmail.com</a><br>
</blockquote></div>
</div></blockquote></body></html>=
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