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The 235 I6 uses vacuum to control the advance of timing.
The brakes use vacuum to assist the power booster for the master cylinder.
(check out this video for an explanation:
https://www.youtube.com/watch?v=3DLThrL8Jjsgc&;)
My guess is to look at the vacuum lines and make sure that they are plumbed
in the correct circuit, and that there is not a corresponding reduction in
vacuum on the timing advance when the brake booster gets used.
What I did to solve this was go to dual carbs and have the brake booster
running off the rear carb, and timing off the front carb. (I recall I did
this when I put on the split fenton headers and changed to a water
cooled/heated intake--but that truck is now with a new owner 1200 miles
away so I can't check it for you).
--Miq
On Sat, Aug 19, 2023 at 9:27=E2=80=AFAM smokey <smokey@railops.com> wrote:
> My 1950 3600 has a 1957 235 engine. I have aftermarket disc brakes.
> Every time I step on the brake the engine dies. So far 2 mechanics have =
no
> idea what's happening here. Any advice?
>
>
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<div dir=3D"ltr"><div dir=3D"ltr"><br></div><div><br></div>The 235 I6 uses =
vacuum to control the advance of timing.<div><br></div><div>The brakes use =
vacuum to assist the power booster for the master cylinder.</div><div><br><=
/div><div>(check out this video for an explanation:=C2=A0 <a href=3D"https:=
//www.youtube.com/watch?v=3DLThrL8Jjsgc&">https://www.youtube.com/watch=
?v=3DLThrL8Jjsgc&</a>)</div><div><br></div><div>My guess is to look at =
the vacuum lines and make sure that they are plumbed in the correct circuit=
, and that there is not a corresponding reduction in vacuum on the timing a=
dvance when the brake booster gets used.</div><div><br></div><div>What I di=
d to solve this was go to dual carbs and have the brake booster running off=
the rear carb, and timing off the front carb.=C2=A0 (I recall I did this w=
hen I put on the split fenton headers and changed to a water cooled/heated =
intake--but that truck is now with a new owner 1200 miles away so I can'=
;t check it for you).</div><div><br></div><div><br></div><div>=C2=A0 --Miq<=
/div><div><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">=
On Sat, Aug 19, 2023 at 9:27=E2=80=AFAM smokey <<a href=3D"mailto:smokey=
@railops.com">smokey@railops.com</a>> wrote:<br></div><blockquote class=
=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rg=
b(204,204,204);padding-left:1ex"><div id=3D"m_-4655527796411060384edo-messa=
ge"><div><div style=3D"font-size:16px">My 1950 3600 has a 1957 235 engine.=
=C2=A0 I have aftermarket disc brakes.=C2=A0 Every time I step on the brake=
the engine dies.=C2=A0 So far 2 mechanics have no idea what's happenin=
g here.=C2=A0 Any advice?</div><div style=3D"font-size:16px"><br></div></di=
v></div>
</blockquote></div></div></div>
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