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Awesome Charley. No factory manual is going to adequately prescribe the
right answer for your FrankenMGB. You must love engine building as much as
do I.
R
On Wed, Apr 24, 2019, 8:41 AM Charley Robinson <Charley38@twc.com> wrote:
> That comment, "Just advance the timing until you notice preignition."
> has to be taken in the context of how much advance can you dial in
> before it starts to ping under load. It's a rough attempt to dial in a
> particular engine/fuel combination. I think most of us know the trial
> and error method.
>
> To answer your question: My B engine is set at ~12* advance @ 850 - 900
> RPM with the vac disconnected. It pulls well through the midrange set
> that way. But my engine kind of "parts is parts." It's a 18V block with
> GH innards (flat -top pistons). All this topped by a pre-smog head and
> HS-4 carbs. So I had to tweak it to get it to run the way I like it on
> mid-grade gas.
>
> CR
>
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<div dir=3D"auto"><div>Awesome Charley. No factory manual is going to adequ=
ately prescribe the right answer for your FrankenMGB. You must love engine =
building as much as do I.</div><div dir=3D"auto"><br></div><div dir=3D"auto=
">R<br><br><div class=3D"gmail_quote" dir=3D"auto"><div dir=3D"ltr" class=
=3D"gmail_attr">On Wed, Apr 24, 2019, 8:41 AM Charley Robinson <<a href=
=3D"mailto:Charley38@twc.com";>Charley38@twc.com</a>> wrote:<br></div><bl=
ockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #=
ccc solid;padding-left:1ex">That comment,=C2=A0 "Just advance the timi=
ng until you notice preignition."=C2=A0 <br>
has to be taken in the context of how much advance can you dial in <br>
before it starts to ping under load.=C2=A0=C2=A0 It's a rough attempt t=
o dial in a <br>
particular engine/fuel combination.=C2=A0 I think most of us know the trial=
<br>
and error method.<br>
<br>
To answer your question: My B engine is set at ~12* advance @ 850 - 900 <br=
>
RPM with the vac disconnected.=C2=A0 It pulls well through the midrange=C2=
=A0 set <br>
that way.=C2=A0 But my engine kind of "parts is parts." It's =
a 18V block with <br>
GH innards (flat -top pistons).=C2=A0 All this topped by a pre-smog head an=
d <br>
HS-4 carbs.=C2=A0 So I had to tweak it to get it to run the way I like it o=
n <br>
mid-grade gas.<br>
<br>
CR<br>
</blockquote></div></div></div>
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