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Thanks for your input on ignition timing Michael.
I have always found the factory specs to be a little confusing.
They state 6 degrees BTDC as the timing (which I presume to be "static")
and then state that the distributor produces 16 - 18 degrees at 2000 RPM
(distributor speed) which I figure to be 32 -36 degrees at 4000 engine RPM.
I interpret that to produce 6 + 34 (2 x 17) degrees BTDC at 4000 engine RPM
for a total of 40 degrees which sounds like an awful lot.
My engine does not sound at all happy with 40 degrees even with 110 octane!=
!
I'm wondering if I have been over thinking this process and the stated
advance is meant to be "at idle" with the vacuum connected (not normal
practice as far as I was taught) which would add 6 degrees of vacuum
advance which would vanish at full throttle producing a net of 34 degrees
over 4000 at full throttle.
I have been setting the timing to 32 degrees BTDC with the vacuum
disconnected at 4000 RPM and the engine runs fey well and very cool, in
fact too cool without a 180 degree thermostat.
I am running 8.3:1 compressions with an M cam.
M
On Fri, Nov 2, 2018 at 9:16 PM Michael Oritt <michael.oritt@gmail.com>
wrote:
> Wayne--
>
> Exactly right--it is total advance that matters and I arrived at that
> number by gradually increasing advance and seeing the effect upon water
> temperature at speed and under full load. Anything more and the car woul=
d
> begin to overheat. A bit too much less advance and performance fell off.
>
> BTW I am running a DW "fast street" cam and tubular header and a Mallory
> non-vacuum advance distributor fired with their Unilite module. I too ha=
ve
> a Smitty's five-speed and the Toyota box, 180 XAS's and 3.54 diff set giv=
e
> me about 72-73 mph at 3K rpm's indicated
>
> Best--Michael Oritt
>
> On Fri, Nov 2, 2018 at 6:03 PM Wayne Schultz <waschu2@gmail.com> wrote:
>
>> Thanks to Michael and others I am going to stick with 34 - 35 degrees
>> total advance for now. What, I think this means, is that the advance at
>> idle is secondary and not as important as total advance. Cruising with t=
he
>> the Toyota five speed or the original overdrive on the highway is right =
in
>> the 3K RPM range so I think this the perfect RPM to limit total advance.=
I
>> might make a run to my local airport and buy some 100LL fuel. I have wor=
ked
>> in aviation since 1967 so I have a few friends=F0=9F=98=83
>>
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<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:comic sa=
ns ms,sans-serif;font-size:small">Thanks for your input on ignition timing =
Michael. <br></div><div class=3D"gmail_default" style=3D"font-family:comic =
sans ms,sans-serif;font-size:small">I have always found the factory specs t=
o be a little confusing.</div><div class=3D"gmail_default" style=3D"font-fa=
mily:comic sans ms,sans-serif;font-size:small">They state 6 degrees BTDC as=
the timing (which I presume to be "static") and then state that =
the distributor produces 16 - 18 degrees at 2000 RPM=C2=A0 (distributor spe=
ed) which I figure to be 32 -36 degrees at 4000 engine RPM.</div><div class=
=3D"gmail_default" style=3D"font-family:comic sans ms,sans-serif;font-size:=
small">I interpret that to produce 6 + 34 (2 x 17) degrees BTDC at 4000 eng=
ine RPM for a total of 40 degrees which sounds like an awful lot.</div><div=
class=3D"gmail_default" style=3D"font-family:comic sans ms,sans-serif;font=
-size:small">My engine does not sound at all happy with 40 degrees even wit=
h 110 octane!!</div><div class=3D"gmail_default" style=3D"font-family:comic=
sans ms,sans-serif;font-size:small">I'm wondering if I have been over =
thinking this process and the stated advance is meant to be "at idle&q=
uot; with the vacuum connected (not normal practice as far as I was taught)=
which would add 6 degrees of vacuum advance which would vanish at full thr=
ottle producing a net of 34 degrees over 4000 at full throttle.<br></div><d=
iv class=3D"gmail_default" style=3D"font-family:comic sans ms,sans-serif;fo=
nt-size:small">I have been setting the timing to 32 degrees BTDC with the v=
acuum disconnected at 4000 RPM and the engine runs fey well and very cool, =
in fact too cool without a 180 degree thermostat.<br></div><div class=3D"gm=
ail_default" style=3D"font-family:comic sans ms,sans-serif;font-size:small"=
>I am running 8.3:1 compressions with an M cam.</div><div class=3D"gmail_de=
fault" style=3D"font-family:comic sans ms,sans-serif;font-size:small"><br><=
/div><div class=3D"gmail_default" style=3D"font-family:comic sans ms,sans-s=
erif;font-size:small">M<br></div><div class=3D"gmail_default" style=3D"font=
-family:comic sans ms,sans-serif;font-size:small"> <br></div></div><br><div=
class=3D"gmail_quote"><div dir=3D"ltr">On Fri, Nov 2, 2018 at 9:16 PM Mich=
ael Oritt <<a href=3D"mailto:michael.oritt@gmail.com";>michael.oritt@gmai=
l.com</a>> wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"ma=
rgin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir=3D"lt=
r"><div class=3D"gmail_default" style=3D"color:#3333ff">Wayne--</div><div c=
lass=3D"gmail_default" style=3D"color:#3333ff"><br></div><div class=3D"gmai=
l_default" style=3D"color:#3333ff">Exactly right--it is total advance that =
matters and I arrived at that number by gradually increasing advance and se=
eing the effect upon water temperature at speed and under full load.=C2=A0 =
Anything more and the car would begin to overheat.=C2=A0 A bit too much les=
s advance and performance fell off.=C2=A0=C2=A0</div><div class=3D"gmail_de=
fault" style=3D"color:#3333ff"><br></div><div class=3D"gmail_default" style=
=3D"color:#3333ff">BTW I am running a DW "fast street" cam and tu=
bular header and a Mallory non-vacuum advance distributor fired with their =
Unilite module.=C2=A0 I too have a Smitty's five-speed and the Toyota b=
ox, 180 XAS's and 3.54 diff set give me about 72-73 mph at 3K rpm's=
indicated</div><div class=3D"gmail_default" style=3D"color:#3333ff"><br></=
div><div class=3D"gmail_default" style=3D"color:#3333ff">Best--Michael Orit=
t</div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr">On Fri, Nov 2,=
2018 at 6:03 PM Wayne Schultz <<a href=3D"mailto:waschu2@gmail.com"; tar=
get=3D"_blank">waschu2@gmail.com</a>> wrote:<br></div><blockquote class=
=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padd=
ing-left:1ex"><div dir=3D"ltr">Thanks to Michael and others I am going to s=
tick with 34 - 35 degrees total advance for now. What, I think this means, =
is that the advance at idle is secondary and not as important as total adva=
nce. Cruising with the the Toyota five speed or the original overdrive on t=
he highway is right in the 3K RPM range so I think this the perfect RPM to =
limit total advance. I might make a run to my local airport and buy some 10=
0LL fuel. I have worked in aviation since 1967 so I have a few friends=F0=
=9F=98=83=C2=A0<div><br></div></div>
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