Subject: [Fot] Distributor centrifugal advance curve for race engine

From: timmmurphh--- via Fot <[email-masked]>
Date: Fri, 19 Mar 2021 17:27:51 -0500

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What advance curve are folks using in their race engines? I have 87mm
pistons, a Kastner G3 cam and about a 12:1 compression ratio. I am using
about 19 degrees advance at idle (no centrifugal advance) and 30 degrees
advance at 3000 RPM.  I don't know what I have at higher RPM's because I
never looked. I'm currently doing an engine rebuild so I will have to look
what I've got at the higher RPM's when I get the engine running. I'm curious
as to what others are using and if anyone has done any testing on a dyno
with different advance curves.

Thanks in advance for your input.

Tim Murphy

#317 BRG TR4

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link=3D"#0563C1" vlink=3D"#954F72" style=3D'word-wrap:break-word'><div =
class=3DWordSection1><p class=3DMsoNormal>What advance curve are folks =
using in their race engines? I have 87mm pistons, a Kastner G3 cam and =
about a 12:1 compression ratio. I am using about 19 degrees advance at =
idle (no centrifugal advance) and 30 degrees advance at 3000 RPM.&nbsp; =
I don&#8217;t know what I have at higher RPM&#8217;s because I never =
looked. I&#8217;m currently doing an engine rebuild so I will have to =
look what I&#8217;ve got at the higher RPM&#8217;s when I get the engine =
running. I&#8217;m curious as to what others are using and if anyone has =
done any testing on a dyno with different advance =
curves.<o:p></o:p></p><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><p =
class=3DMsoNormal>Thanks in advance for your input.<o:p></o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal>Tim =
Murphy<o:p></o:p></p><p class=3DMsoNormal>#317 BRG =
TR4<o:p></o:p></p></div></body></html>
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---

From: Phil Gott via Fot <[email-masked]>
Date: Fri, 19 Mar 2021 18:45:40 -0400

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The Advance curve is all done at about 3000 rpm. 30 degrees total advance is=
 about right. Will depend on your particular engine, but might be best to ba=
ck off 2-4 degrees.

Sent from my iPhone

> On Mar 19, 2021, at 6:41 PM, Greg Hilyer via Fot <[email-masked]> wrot=
e:
>=20
> =EF=BB=BF
> Hey Tim,
> Happy belated 3/17!
> There=E2=80=99s a guy named Kas (can=E2=80=99t remember the last name) tha=
t did some dyno tuning awhile back - he even wrote a book or two about it=F0=
=9F=A4=AA.
> But in all seriousness, I=E2=80=99ve done mine by the (Comp Prep Manual) b=
ook. Base and total is easy but it takes a bunch of fiddling to get the =E2=80=
=9CKas curve=E2=80=9D. Has worked great but I=E2=80=99ll admit that I=E2=80=99=
ve never gone beyond that.
> Greg =E2=80=9CLunker=E2=80=9D Hilyer=20
> Albuquerque NM
>=20
>> On Mar 19, 2021, at 4:27 PM, timmmurphh--- via Fot <[email-masked]> w=
rote:
>>=20
>> What advance curve are folks using in their race engines? I have 87mm pis=
tons, a Kastner G3 cam and about a 12:1 compression ratio. I am using about 1=
9 degrees advance at idle (no centrifugal advance) and 30 degrees advance at=
 3000 RPM.  I don=E2=80=99t know what I have at higher RPM=E2=80=99s because=
 I never looked. I=E2=80=99m currently doing an engine rebuild so I will hav=
e to look what I=E2=80=99ve got at the higher RPM=E2=80=99s when I get the e=
ngine running. I=E2=80=99m curious as to what others are using and if anyone=
 has done any testing on a dyno with different advance curves.
>> =20
>> =20
>>=20
>>=20
>> Donate: http://www.team.net/donate.html
>> Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/lunkercars@=
yahoo.com
>>=20
>>=20
>=20
>=20
> Donate: http://www.team.net/donate.html
> Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/vfracing@aol=
.com
>=20
>=20

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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">The Advance curve is all done at about 3000=
 rpm. 30 degrees total advance is about right. Will depend on your particula=
r engine, but might be best to back off 2-4 degrees.<div><br><br><div dir=3D=
"ltr">Sent from my iPhone</div><div dir=3D"ltr"><br><blockquote type=3D"cite=
">On Mar 19, 2021, at 6:41 PM, Greg Hilyer via Fot &lt;[email-masked]&gt=
; wrote:<br><br></blockquote></div><blockquote type=3D"cite"><div dir=3D"ltr=
">=EF=BB=BF<meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"><div dir=3D"ltr"></div><div dir=3D"ltr">Hey Tim,</div><div dir=3D"ltr=
">Happy belated 3/17!</div><div dir=3D"ltr">There=E2=80=99s a guy named Kas (=
can=E2=80=99t remember the last name) that did some dyno tuning awhile back -=
 he even wrote a book or two about it=F0=9F=A4=AA.</div><div dir=3D"ltr">But=
 in all seriousness, I=E2=80=99ve done mine by the (Comp Prep Manual) book. B=
ase and total is easy but it takes a bunch of fiddling to get the =E2=80=9CK=
as curve=E2=80=9D. Has worked great but I=E2=80=99ll admit that I=E2=80=99ve=
 never gone beyond that.</div><div dir=3D"ltr">Greg =E2=80=9CLunker=E2=80=9D=
 Hilyer&nbsp;</div><div dir=3D"ltr">Albuquerque NM</div><div dir=3D"ltr"><br=
>On Mar 19, 2021, at 4:27 PM, timmmurphh--- via Fot &lt;<a href=3D"mailto:fo=
[email-masked]">[email-masked]</a>&gt; wrote:<br><br></div><blockquote=
 type=3D"cite"><div dir=3D"ltr"><meta http-equiv=3D"Content-Type" content=3D=
"text/html; charset=3Dus-ascii"><meta name=3D"Generator" content=3D"Microsof=
t Word 15 (filtered medium)"><style><!--
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<o:idmap v:ext=3D"edit" data=3D"1" />
</o:shapelayout></xml><![endif]--><div class=3D"WordSection1"><p class=3D"Ms=
oNormal">What advance curve are folks using in their race engines? I have 87=
mm pistons, a Kastner G3 cam and about a 12:1 compression ratio. I am using a=
bout 19 degrees advance at idle (no centrifugal advance) and 30 degrees adva=
nce at 3000 RPM.&nbsp; I don=E2=80=99t know what I have at higher RPM=E2=80=99=
s because I never looked. I=E2=80=99m currently doing an engine rebuild so I=
 will have to look what I=E2=80=99ve got at the higher RPM=E2=80=99s when I g=
et the engine running. I=E2=80=99m curious as to what others are using and i=
f anyone has done any testing on a dyno with different advance curves.<o:p><=
/o:p></p><p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p><p class=3D"MsoNormal">=
Thanks in advance for your input.<o:p></o:p></p><p class=3D"MsoNormal"><o:p>=
&nbsp;</o:p></p><p class=3D"MsoNormal">Tim Murphy<o:p></o:p></p><p class=3D"=
MsoNormal">#317 BRG TR4<o:p></o:p></p></div></div></blockquote><blockquote t=
ype=3D"cite"><div dir=3D"ltr"><span>________________________________________=
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