[tcb] Re: what's going on with this (vacuum leak or what)
- From: Neil <nbmdude@xxxxxxxxx>
- To: tcb@xxxxxxxxxxxxx
- Date: Thu, 28 Aug 2008 11:24:23 -0700 (PDT)
dang Will, you KNOW yer stuff!
--- On Thu, 8/28/08, Will Wood <evilscientistboo@xxxxxxxxxxxxx> wrote:
> From: Will Wood <evilscientistboo@xxxxxxxxxxxxx>
> Subject: [tcb] Re: what's going on with this (vacuum leak or what)
> To: tcb@xxxxxxxxxxxxx
> Date: Thursday, August 28, 2008, 10:01 AM
> Fuel Filters help but all it takes is a very, very small
> piece of rust or dirt and your idle circuit will be plugged.
> This results in hesitation and crappy running up to when
> your main jet takes over.
>
> You have 4 "circuits" in a carb.
>
> idle, progression, main and enrichment.
>
> the idle/progression circuits are governed by the idle jet
> which has the smallest jet hole in it. Typically less than
> .7mm in diameter. That's why small debris can cause you
> grief.
>
> Your mixture screw just governs the idle circuit when the
> engine is at idle, when you get on the throttle, the idle
> jet supplies fuel via a series of holes in the venturi path.
> During this time the engine isn't pulling enough air to
> activate the main jet. Typically your idle jet can govern
> your fuel delivery in speeds up to 40-50mph in 4th gear.
>
> I found crap in the idle jets of the submarine bus last
> year at TP4 and the owner said the performance was much
> improved.
>
>
>
> -----Original Message-----
> >From: Brian Denning <i_am_cool_fred@xxxxxxxxxxx>
> >Sent: Aug 28, 2008 9:32 AM
> >To: tcb@xxxxxxxxxxxxx
> >Subject: [tcb] Re: what's going on with this
> (vacuum leak or what)
> >
> >
> >JUST CRAP IN THE CARB....
> >
> >
> >HOW OFTEN DO I DO THAT???
> >
> >i will try the carb cleaner then tonight
> >
> >hopefully it's that and not any jetting problems
> because that carb is a pita to take off
> >----------------------------------------
> >> Date: Thu, 28 Aug 2008 09:19:31 -0500
> >> From: evilscientistboo@xxxxxxxxxxxxx
> >> To: tcb@xxxxxxxxxxxxx
> >> Subject: [tcb] Re: what's going on with this
> (vacuum leak or what)
> >>
> >>
> >> Just use some spray carb cleaner, not starting
> fluid since it's more volatile.
> >>
> >> I'd also just check to make sure the idle jet
> isn't plugged as well. You could have some crap in the
> carb.
> >>
> >> -----Original Message-----
> >>>From: Brian Denning
> >>>Sent: Aug 28, 2008 7:59 AM
> >>>To: tcb@xxxxxxxxxxxxx
> >>>Subject: [tcb] Re: what's going on with
> this (vacuum leak or what)
> >>>
> >>>
> >>>new plugs a month and a half ago...gapped
> according to the bently. last time i replaced them i took
> them to my carb guy and he said perfect then did the little
> french kiss the fingers thing
> >>>
> >>>guess i'll be buying some starter fluid on
> my way home tonight and trace down that leak
> >>>________________________________
> >>>> Date: Thu, 28 Aug 2008 05:55:06 -0700
> >>>> From: bugcollections@xxxxxxxxxxxxx
> >>>> Subject: [tcb] Re: what's going on
> with this (vacuum leak or what)
> >>>> To: tcb@xxxxxxxxxxxxx
> >>>>
> >>>> Think you are on the right track, i.e.,
> fuel or vacum: But what do the spark plugs look like and
> when did you last replace them?
> >>>>
> >>>> --- On Thu, 8/28/08, Brian Denning wrote:
> >>>> From: Brian Denning
> >>>> Subject: [tcb] what's going on with
> this (vacuum leak or what)
> >>>> To: tcb@xxxxxxxxxxxxx
> >>>> Date: Thursday, August 28, 2008, 7:32 AM
> >>>>
> >>>> yesterday i replaced points, condensor,
> cap and rotar. the points were clearly burned.
> >>>>
> >>>> the bus is acting as if it's loading
> up and dieing...i have to stay on the throttle a little bit
> to keep it running, it pops and sputters when i reach any
> respectable rpm while driving too.
> >>>>
> >>>> i've checked risers, i have brand new
> intake boots on it, and i checked torque on teh weber.
> >>>>
> >>>> what does that leave?
> >>>>
> >>>> compression? i hope that isn't the
> problem
> >>>>
> >>>> any suggestions.
> >>>>
> >>>> points are gapped correctly.
> >>>>
> >>>> oh, also, when i adjust timing fast or
> slow it doesn't really affect how fast the motor runs.
> >>>>
> >>>> ________________________________
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> >>>
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> >>
> >
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