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gee, my 1147 with HS's puled all the way to 8k with a 4:11 gear - stock bo=
re block, head work, A6 cam - its not the carbs, its either timing or cam
On =E2=80=8EThursday=E2=80=8E, =E2=80=8EOctober=E2=80=8E =E2=80=8E18=E2=
=80=8E, =E2=80=8E2018=E2=80=8E =E2=80=8E01=E2=80=8E:=E2=80=8E13=E2=80=8E:=
=E2=80=8E48=E2=80=8E =E2=80=8EPM=E2=80=8E =E2=80=8ECDT, van.mulders.marcel-=
-- via Fot <fot@autox.team.net> wrote: =20
=20
-"...hitting a wall at that point..." : is it possible this is rather poin=
ting to the camshaft than to the SU's? If it are the carburettors, maybe th=
e power would decrease more gradually above 6500 rpm.-In general one choke =
per cylinder is better, and 2 Webers 40 DCOE isn't overkill I think- what a=
bout trying HS6 SU's on your actual manifold?At what maximum rpm is your en=
gine still reliable?Marcel
Van: "fot" <fot@autox.team.net>
Aan: "fot" <fot@autox.team.net>
Verzonden: Woensdag 17 oktober 2018 15:49:45
Onderwerp: [Fot] Weber vs Mikuni
I'm looking into switching out my twin HS4s on the 1296 race engine to eith=
er Weber or Mukinis. I know this has been done for years and I'd like to ge=
t close the best set up out of the gate.=20
I don't think the SUs are up to the task of moving enough air with the new =
ported head and Stahl header. I've worked on the SUs and gotten them to fin=
ally deliver a good AFR , 12.6, at 6500 RPM under load but I seem to hit a =
wall (figuratively) at that point. I suspect that the openings just aren't =
big enough to deliver the mass of air required. (spreadsheet or other flow =
calculator link appreciated)
Biggest gate I suspect is the intake valve, 1 3/8" head (~35mm) HS4 is ~38m=
m at best.
Recommendations? I've seen all these setups at the track, each with pluses,=
minuses and overkill cause it looks cool.=20
One weber DCOE 40 or 2? what jets, tubes etc for a starting point? Best man=
ifold?=20
2 or 4 Mikuni 40? jet size?
thanksmike
_______________________________________________
fot@autox.team.net
http://www.fot-racing.com
Archive: http://www.team.net/pipermail/fot
arcel@telenet.be
_______________________________________________
fot@autox.team.net
http://www.fot-racing.com
Archive: http://www.team.net/pipermail/fot
com
=20
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<html><head></head><body><div class=3D"ydp154784e8yahoo-style-wrap" style=
=3D"font-family: Helvetica Neue,Helvetica,Arial,sans-serif; font-size: 13px=
;"><div></div>
<div>gee, my 1147 with HS's puled all the way to 8k with a 4:11 gea=
r - stock bore block, head work, A6 cam - its not the carbs, its either tim=
ing or cam</div><div><br></div>
=20
</div><div class=3D"ydpe7e79603yahoo_quoted" id=3D"ydpe7e79603yahoo=
_quoted_0115294811">
<div style=3D"font-family:'Helvetica Neue', Helvetica, Arial, s=
ans-serif;font-size:13px;color:#26282a;">
=20
<div>
On =E2=80=8EThursday=E2=80=8E, =E2=80=8EOctober=E2=80=
=8E =E2=80=8E18=E2=80=8E, =E2=80=8E2018=E2=80=8E =E2=80=8E01=E2=80=8E:=E2=
=80=8E13=E2=80=8E:=E2=80=8E48=E2=80=8E =E2=80=8EPM=E2=80=8E =E2=80=8ECDT, v=
an.mulders.marcel--- via Fot <fot@autox.team.net> wrote:
</div>
<div><br></div>
<div><br></div>
<div><div id=3D"ydpe7e79603yiv4783538815"><div><div style=
=3D"font-family:Verdana, Arial, Helvetica, sans-serif;font-size:10pt;color:=
#000000;"><div>-"...hitting a wall at that point..." : is it possible this =
is rather pointing to the camshaft than to the SU's? If it are the carburet=
tors, maybe the power would decrease more gradually above 6500 rpm.</div><d=
iv>-In general one choke per cylinder is better, and 2 Webers 40 DCOE isn't=
overkill I think</div><div>- what about trying HS6 SU's on your actual man=
ifold?</div><div>At what maximum rpm is your engine still reliable?</div><d=
iv>Marcel</div><div><br clear=3D"none"></div><hr id=3D"ydpe7e79603yiv478353=
8815zwchr"><div class=3D"ydpe7e79603yiv4783538815yqt3904850125" id=3D"ydpe7=
e79603yiv4783538815yqt49846"><div><b>Van: </b>"fot" <fot@autox.team.net&=
gt;<br clear=3D"none"><b>Aan: </b>"fot" <fot@autox.team.net><br clear=
=3D"none"><b>Verzonden: </b>Woensdag 17 oktober 2018 15:49:45<br clear=3D"n=
one"><b>Onderwerp: </b>[Fot] Weber vs Mikuni<br clear=3D"none"></div><br cl=
ear=3D"none"><div><div dir=3D"ltr"><div>I'm looking into switching out my t=
win HS4s on the 1296 race engine to either Weber or Mukinis. I know this ha=
s been done for years and I'd like to get close the best set up out of the =
gate. <br clear=3D"none"></div><br clear=3D"none"><div>I don't think the SU=
s are up to the task of moving enough air with the new ported head and Stah=
l header. I've worked on the SUs and gotten them to finally deliver a good =
AFR , 12.6, at 6500 RPM under load but I seem to hit a wall (figuratively) =
at that point. I suspect that the openings just aren't big enough to delive=
r the mass of air required. (spreadsheet or other flow calculator link appr=
eciated)<br clear=3D"none"></div><div>Biggest gate I suspect is the intake =
valve, 1 3/8" head (~35mm) HS4 is ~38mm at best.<br clear=3D"none"></div><b=
r clear=3D"none"><div>Recommendations? I've seen all these setups at the tr=
ack, each with pluses, minuses and overkill cause it looks cool. <br clear=
=3D"none"></div><br clear=3D"none"><div>One weber DCOE 40 or 2? what jets, =
tubes etc for a starting point? Best manifold? <br clear=3D"none"></div><br=
clear=3D"none"><div>2 or 4 Mikuni 40? jet size?</div><br clear=3D"none"><d=
iv>thanks</div><div>mike<br clear=3D"none"></div></div>
<br clear=3D"none">_______________________________________________<br clear=
=3D"none">fot@autox.team.net<br clear=3D"none"><br clear=3D"none">http://ww=
w.fot-racing.com<br clear=3D"none"><br clear=3D"none">Donate: http://www.te=
am.net/donate.html<br clear=3D"none">Archive: http://www.team.net/pipermail=
/fot<br clear=3D"none">Unsubscribe/Manage: http://autox.team.net/mailman/op=
tions/fot/van.mulders.marcel@telenet.be<br clear=3D"none"></div></div></div=
></div></div><div class=3D"ydpe7e79603yqt3904850125" id=3D"ydpe7e79603yqt23=
489">_______________________________________________<br clear=3D"none"><a h=
ref=3D"mailto:fot@autox.team.net"; target=3D"_blank" rel=3D"nofollow" shape=
=3D"rect">fot@autox.team.net</a><br clear=3D"none"><br clear=3D"none"><a hr=
ef=3D"http://www.fot-racing.com"; target=3D"_blank" rel=3D"nofollow" shape=
=3D"rect">http://www.fot-racing.com</a><br clear=3D"none"><br clear=3D"none=
">Donate: <a href=3D"http://www.team.net/donate.html"; target=3D"_blank" rel=
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=3D"none">Archive: <a href=3D"http://www.team.net/pipermail/fot"; target=3D"=
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ailman/options/fot/quikrx@yahoo.com" target=3D"_blank" rel=3D"nofollow" sha=
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br clear=3D"none"><br clear=3D"none"><br clear=3D"none"></div></div>
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_______________________________________________
fot@autox.team.net
http://www.fot-racing.com
Archive: http://www.team.net/pipermail/fot
--===============8677940632596594391==--
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