Hello you two,
Firstly thanks for your response. I had very little response to the question.
Secondly, if you hadn't mentioned the reversal on the Allen key, being
anti-clock is lean & clock is rich, I probably would have gone nuts by now.
This is the reason I wanted to post this on the list, so that new listers could
have some important info.
Much to my chagrin, I did the big neophyte thing & that is, I didn't read the
instructions properly. Small incidents like clock or anti-clock can & do make
all the difference.
I had a quick jab at it before heading out this am(daily driver) & while not
perfect, it made a" HUGE DIFFERENCE!!!!!!!"
I had done, what I thought was exactly as written by John Armstrong & nay,'twas
not to be.
Thank you again. I never cease being transfixed & amazed at the depth of
knowledge this list has.
Onward and upward!
Aubrey 75B
Charley & Peggy Robinson wrote:
> Hi Aubrey,
>
> Pulling out the choke on the ZS makes it run richer, doesn't affect the
> air flow. It's a richening valve, not a butterfly, y'see. So it would
> follow that the carb is set too lean or something in the carb is
> malfunctioning and causing it to run lean. I suppose you are aware that
> the needle adjustment works backwards. I.E., turning it in richens it,
> out leans it. For an article on ZS carbs try this URL:
> http://www.sky.net/~boballen/mg/stories/TwistedZenith.html
>
> I'd run at least 12 - 15 degrees initial advance on a 10:1
> compression engine. Stumbling could be because of the lack of the vac.
> You'll have to play with it. How did you arrive at that compression figure?
>
> Hope this helps,
>
> CR
> '69 B
>
> Aubrey Schneider wrote:
>
> > Hello Listers,
> >
> > MGB MK 2 1798 cc.
> >
> > After passing Aircare(SMOG) I have been experiencing hesitation,
> > missing, loud popping under compression (down hill) & now, very
> > difficult starting.
> >
> > You may recall my saying that it ran better with choke out.
> > This is what I've done & the consequences.
> >
> > Increased fuel flow through dashpot by 1 turn (richer)
> > re-checked dizzy gap, re-did timing.
> > All above to no avail.
> >
> > What I think. Firstly the compression ratio is more than spec, somwhere
> > about 10:1. With higher compression, do the plugs (NGK, type N9's of
> > Champion) require a different setting other than spec @ 035" & does the
> > dizzy (point gap) have to be set to a setting other than spec @ 16?
> > Does the timing need to be altered due to the higher compression & if
> > so, what value BTDC?
> >
> > With the setting on the ZS (should have mentioned that earlier, sorry)
> > running I believe rich, I'm also confused by the fact of pulling the
> > choke out (richer, or less air, don't know which) settles the motor down
> > quite considerably & gives it more pick-up. I have also disconnected the
> > vacuum advance due to a leak(doesn't hold vacuum when sucking on it)
> >
> > I have itemised the above, as I notice a few folks have recently joined
> > the list & they may wish to keep for future references.
> > While being confusing & somewhat irritating, it is also most, most
> > intriguing.
> >
> > Your advice please & thank you
> > Aubrey 75B
/// or try http://www.team.net/cgi-bin/majorcool
/// Archives at http://www.team.net/archive
|