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Last season I ran triple Webbers on my TR6 and it ran slightly better =
than my PI setup. This year I switched to 3 Z-S carbs and I ran every =
bit as good as the Webbers if not better. The Webbers sound a lot =
different, raspier, so for sure you'll sound like you're making more =
power at the least. The PI was much smoother sounding, and the Z-S are =
very good sounding also.
Charly Mitchel
TR6 #44
----- Original Message -----=20
From: van.mulders.marcel--- via Fot=20
To: Mike Harmuth=20
Cc: fot=20
Sent: Wednesday, October 17, 2018 11:49 PM
Subject: Re: [Fot] Weber vs Mikuni
-"...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 carburettors, =
maybe the 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 about trying HS6 SU's on your actual manifold?
At what maximum rpm is your engine 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 =
either Weber or Mukinis. I know this has been done for years and I'd =
like to get 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 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 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 =
~38mm 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 manifold?=20
2 or 4 Mikuni 40? jet size?
thanks
mike
_______________________________________________
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http://www.fot-racing.com
Donate: http://www.team.net/donate.html
Archive: http://www.team.net/pipermail/fot
Unsubscribe/Manage: =
http://autox.team.net/mailman/options/fot/van.mulders.marcel@telenet.be
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_______________________________________________
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http://www.fot-racing.com
Donate: http://www.team.net/donate.html
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<DIV><FONT size=3D2 face=3DArial>Last season I ran triple Webbers on my =
TR6 and it=20
ran slightly better than my PI setup. This year I switched to 3 =
Z-S carbs=20
and I ran every bit as good as the Webbers if not better. The =
Webbers=20
sound a lot different, raspier, so for sure you'll sound like you're =
making more=20
power at the least. The PI was much smoother sounding, and the Z-S =
are very=20
good sounding also.</FONT></DIV>
<DIV>Charly Mitchel<BR>TR6 #44</DIV>
<DIV><FONT size=3D2 face=3DArial></FONT> </DIV>
<DIV>----- Original Message ----- </DIV>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; =
PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px">
<DIV=20
style=3D"FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: =
black"><B>From:</B>=20
<A title=3Dfot@autox.team.net=20
href=3D"mailto:fot@autox.team.net";>van.mulders.marcel--- via Fot</A> =
</DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Dofracer@gmail.com=20
href=3D"mailto:ofracer@gmail.com";>Mike Harmuth</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>Cc:</B> <A =
title=3Dfot@autox.team.net=20
href=3D"mailto:fot@autox.team.net";>fot</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Wednesday, October 17, =
2018 11:49=20
PM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: [Fot] Weber vs =
Mikuni</DIV>
<DIV><BR></DIV>
<DIV=20
style=3D"FONT-FAMILY: Verdana, Arial, Helvetica, sans-serif; COLOR: =
#000000; FONT-SIZE: 10pt">
<DIV>-"...hitting a wall at that point..." : is it possible this is =
rather=20
pointing to the camshaft than to the SU's? If it are the carburettors, =
maybe=20
the power would decrease more gradually above 6500 rpm.</DIV>
<DIV>-In general one choke per cylinder is better, and 2 Webers 40 =
DCOE isn't=20
overkill I think</DIV>
<DIV>- what about trying HS6 SU's on your actual manifold?</DIV>
<DIV>At what maximum rpm is your engine still reliable?</DIV>
<DIV>Marcel</DIV>
<DIV><BR></DIV>
<HR id=3Dzwchr data-marker=3D"__DIVIDER__">
<DIV data-marker=3D"__HEADERS__"><B>Van: </B>"fot"=20
<fot@autox.team.net><BR><B>Aan: </B>"fot"=20
<fot@autox.team.net><BR><B>Verzonden: </B>Woensdag 17 oktober =
2018=20
15:49:45<BR><B>Onderwerp: </B>[Fot] Weber vs Mikuni<BR></DIV><BR>
<DIV data-marker=3D"__QUOTED_TEXT__">
<DIV dir=3Dltr>
<DIV>I'm looking into switching out my twin HS4s on the 1296 race =
engine to=20
either Weber or Mukinis. I know this has been done for years and I'd =
like to=20
get close the best set up out of the gate. <BR></DIV><BR>
<DIV>I don't think the SUs are up to the task of moving enough air =
with the=20
new ported head and Stahl header. I've worked on the SUs and gotten =
them to=20
finally deliver a good AFR , 12.6, at 6500 RPM under load but I seem =
to hit a=20
wall (figuratively) at that point. I suspect that the openings just =
aren't big=20
enough to deliver the mass of air required. (spreadsheet or other flow =
calculator link appreciated)<BR></DIV>
<DIV>Biggest gate I suspect is the intake valve, 1 3/8" head (~35mm) =
HS4 is=20
~38mm at best.<BR></DIV><BR>
<DIV>Recommendations? I've seen all these setups at the track, each =
with=20
pluses, minuses and overkill cause it looks cool. <BR></DIV><BR>
<DIV>One weber DCOE 40 or 2? what jets, tubes etc for a starting =
point? Best=20
manifold? <BR></DIV><BR>
<DIV>2 or 4 Mikuni 40? jet size?</DIV><BR>
<DIV>thanks</DIV>
=
<DIV>mike<BR></DIV></DIV><BR>____________________________________________=
___<BR>fot@autox.team.net<BR><BR>http://www.fot-racing.com<BR><BR>Donate:=
=20
http://www.team.net/donate.html<BR>Archive:=20
http://www.team.net/pipermail/fot<BR>Unsubscribe/Manage:=20
=
http://autox.team.net/mailman/options/fot/van.mulders.marcel@telenet.be<B=
R></DIV></DIV>
<P>
<HR>
=
<P></P>_______________________________________________<BR>fot@autox.team.=
net<BR><BR>http://www.fot-racing.com<BR><BR>Donate:=20
http://www.team.net/donate.html<BR>Archive:=20
http://www.team.net/pipermail/fot<BR>Unsubscribe/Manage:=20
=
http://autox.team.net/mailman/options/fot/charly@mitchelplumbing.com<BR><=
BR><BR></BLOCKQUOTE></BODY></HTML>
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