who's got a weber on a sierra

[built4thrashing]

that is right but the best thing to do is to mount the webber so the fuel bowl is at the firewall. this way you only get minor stalling on steep downhills.

[ado250]

Yeah unfortunately I mounted the thing so that it stalls uphill, so I guess when I eventually get into some more serious wheeling (not just yet, still need my bodylift and tyres) then I will need to vent the chamber.

I still can't make out though where I have to putty up the gaps. Will it be obvious what I have to do when I crack it open?

[built4thrashing]

when you pull the top off the weber you will see that 3 sides to the fuel bowl are smooth and flat but the side closest to the throats are shaped around the air jets. This is where the float vents in stock form as the top doesnt seal up on it. so you need to fill in this area to allow the top to seal when put back together.

you will see what i mean when ya pull it apart. just have a spare top gasket handy coz they are easy to dammage if old.

[ado250]

Just wanting to know,

as i've mentined previously, i'm running a 32/36 off a 2 litre bluebird. Now the guy at the store the carb was originally bought from reckons these types of carbs run 140/140 mains stock. I can't work out though why my vehicle is running so rich if that's the case, as that's probably close to the mark on what I should run. Does anybody know what kind of fuel economy a peak performing weber should run on the open road? I think I was only getting about 8.5 km's a litre from sydney to Goulburn!

I bought myself a 130 and 135 main jet to muck around with.

[JrZook]

The best i can get with the weber on is 11k's to the liter sitting on 100 real kilometers with a 1 liter tcase and 235 mts. This was with no head wind mind you and on premium

[built4thrashing]

i wish i could get that . im lucky to get 8's but i do have a steel bullbar and a steel 3inch roll bar. Doesnt help having 31 muds and only a 1ltr t/case. But it sounds sweety with the foot planted

[ado250]

Hmm,

Well I was sitting on 120kph most of the way in a strong headwind.... maybe I shouldn't be so greedy hey///

I would like to try running on a smaller primary main jet and opening up the secondary a bit more so that I get the economy around town.

[JrZook]

Hmm,

Well I was sitting on 120kph most of the way in a strong headwind.... maybe I shouldn't be so greedy hey///

I would like to try running on a smaller primary main jet and opening up the secondary a bit more so that I get the economy around town.

Yea ummmm sitting a zook on 120kph is not really to economical , could ya do that wif the std carb?

[ado250]

No Way!!!

The standard would struggle to maintain 100Kph. Don't get me wrong, I could get it to wind out very slowly on a flat road with no wind to 130, but a headwind or a slight hill, it was fourth to get it over.

Ive since added a return spring to the original accelerator cable bracket (bent by oxy heating so that it would work the opposite way around). Haven't done any tuning yet

[SIERRA BANDIT]

i recently put a weber on my sierra and got about 240ks out of about half a tank, but thats with 31 s and i havent adjusted the spedo and its 10kmh out so the motor only ran about 216 km.
does this make any sense correct me if im wrong

[JrZook]

i recently put a weber on my sierra and got about 240ks out of about half a tank, but thats with 31 s and i havent adjusted the spedo and its 10kmh out so the motor only ran about 216 km.
does this make any sense correct me if im wrong

240k's bout half tank, if the speedo is out bout 10kph u'd be getting 264k's outta half tank, but i doubt that fdrom a std 40l tank. Is that just the reading off your fuel guage? The only way to really check this is drive bout 300k's from an absolute full tank, then see exactly how much fuel it takes to fill full again. For instance mine does a real 370k's out of 34l on the highway which is 10.88k's per liter. That 370k's has taken into account that i run 235's and 1l tcase which equates to being 10% out off the speedo reading

[built4thrashing]

mine gets 0km per ltr atm as engine is still farked. just missed out on a 1.6 carb engine. buggar

[JrZook]

Here we go, stumbled across this while surfing, heaps of carb info:) enjoy.
http://www.teamswift.net/viewforum.php?f=8

[NIK]

Hey Guys, Ive ran webers on 2 different zooks and all ive done is take them off a 2lt cortina and bolt them onto the zook ( with adapter ).
But reading this thread I thought maybe I should attempt to tune it properly.
Not sure what model the carb is but on the tag it says
Weber
76HP MA
A 6E25

It also has 26 stamped on the primary body and 27 on the secondary.
I pulled it apart to check jet sizes but Im not sure which is which.
The t piece looking thing has 50 EM on it. The jets under that are 175 prim and 145 sec .The pieces under that that go across the throats are 3.5 prim 4.5 sec. The jets in the float bowl are 132 prim 127sec.
I hope someone understands that, I had a read through the thread but on dial up its sooo slow.
I would post a pic but half hour of swearing no luck (any ideas)
Nik

[JrZook]

Hey Guys, Ive ran webers on 2 different zooks and all ive done is take them off a 2lt cortina and bolt them onto the zook ( with adapter ).
But reading this thread I thought maybe I should attempt to tune it properly.
Not sure what model the carb is but on the tag it says
Weber
76HP MA
A 6E25

It also has 26 stamped on the primary body and 27 on the secondary.
I pulled it apart to check jet sizes but Im not sure which is which.
The t piece looking thing has 50 EM on it. The jets under that are 175 prim and 145 sec .The pieces under that that go across the throats are 3.5 prim 4.5 sec. The jets in the float bowl are 132 prim 127sec.
I hope someone understands that, I had a read through the thread but on dial up its sooo slow.
I would post a pic but half hour of swearing no luck (any ideas)
Nik

The 26/27 are the internal main venturi sizes(not changeable)
The t piece thing im pretty sure is the accelerator pump jet size, no need to change that one.
3.5 and 4.5 are your auxilliary venturies
Jets in the float bowl (132&127) are the mains
The 175&145 im pretty sure are your air correctors.

Just guessing on your discriptions, but yea mains are in the fuel bowl, idles are on either side of the carb(flat head screw driver will take them out). Air correctors are right on top of the carb(brass with flat head screw top). Under these are the emulsion tubes. The aux venturies run across the throats. And the accelerator pump jet is up top between the air correctors.

Hope this helps,
Cheers Dan

[NIK]

Thanx Jr zook,
Any ideawhat size the carb is and would the jet sizes recommended in this thread be worth trying?
Are the idle jets accessed from inside the carbor outside. Are they any of the numbers I listed?
Do they emolsion tubes screw out after I take out the air correctors?
Thanks Nik

[NIK]

All sorted answered my on question. I didnt reliase the model was stamped on the base plate! I have a 32/36 so I,l give the mods a go and see how it works for me.
Nik

[built4thrashing]

the jetting in that carb is the australian factory setting for a 2ltr escort. they are ok as a start for a sierra but not perfect.

[smiley_smoke]

and the best place to get a weber is?... and what pricing would i be looking at guys?

[NIK]

Smiley-smoke
I got mine from the wreckers, been running it for bout 3yrs without touching a thing. But now im going to try fine tuning it. The carb cost about $70 and the adapter about $20. If you look back through this thread it has the part number for the adaptor.

B4T Ive gone right through the carb now the specs are
32/36
primary secondary
air 175 air 145
main 132 main 127
idle 55 idle 50
e tubes f6 6? (cant read it properly)

The local parts guy said the main jets are back to front, so I swapped them over and it did pull alot better from 3500rpm but below that if you stomped on it it bogged right down before picking up.
Any ideas? Should I just try the settings you posted previosly?
Thanks Nik

[JrZook]

Smiley-smoke
I got mine from the wreckers, been running it for bout 3yrs without touching a thing. But now im going to try fine tuning it. The carb cost about $70 and the adapter about $20. If you look back through this thread it has the part number for the adaptor.

B4T Ive gone right through the carb now the specs are
32/36
primary secondary
air 175 air 145
main 132 main 127
idle 55 idle 50
e tubes f6 6? (cant read it properly)

The local parts guy said the main jets are back to front, so I swapped them over and it did pull alot better from 3500rpm but below that if you stomped on it it bogged right down before picking up.
Any ideas? Should I just try the settings you posted previosly?
Thanks Nik

So are these jets wat ur carb is running atm or have you swapped the primary main with the secondary???

[NIK]

Sorry the specs I listed are what was in it when I got it from the wreckers. It was suggest that I swap the mains over. When I did it created the symptoms above so I swapped them back until I get more advice cause when it bogged down the zook stopped moving and its a bit crazy in traffic.
Nik

[built4thrashing]

the best advice i canb give id to get it dyno tuned if ya can afford it but if ya a tight ass like most of us ya will have a go at doing it yaself. the stock escort jetting is ok as a starting point and will give you reasonable performance. the first mod or change you should do is reverse the carby and modify the float vent so it works better offroad. then tune it to suit how it gets used.

[JrZook]

32/36
primary secondary
air 175 air 145
main 132 main 127
idle 55 idle 50
e tubes f6 6? (cant read it properly)

The local parts guy said the main jets are back to front, so I swapped them over and it did pull alot better from 3500rpm but below that if you stomped on it it bogged right down before picking up.
Any ideas? Should I just try the settings you posted previosly?
Thanks Nik

When you had that boggin down under 3500rpm that was probabily due to being too lean on the primary side when u changed the jets over. But when you say i went harder arft 3500 sounds like the 127 jet in too lean.
You could try swapping the air correctors over and find a slightly bigger second main-like a 130-135, since the air is going to be bigger.

What other engine mods do you have? Extractors?

HEy B4T hows your engine built going??

[spook_95]

alien said

Posted: Tue Jul 26, 2005 12:49 am

--------------------------------------------------------------------------------
the hesitation you're talking about... does it happen if you slowly apply the accel?

mine has this hesitation also - but only if i plant my foot/put it down heavy - seems to flood a little.. more pronounced on cold mornings when its choked, or still cold. i find a quick tap of the pedal before dropping the clutch remedies this.

may just be a side effect of the larger carby?


i have this same problem with my standard carb on a 1l f10a only nothing seems to make it better it also starts to breakdown reall bad when you stick the boot in any suggestions

[NIK]

Ive always ran them back to front but I havnt modded the float vent yet.
I cant quite make out the details in the pic of the carb but if you look at the carb from the front of the zook (with the carb mounted backwards) the float vent area has 4 spaces along the side closest to the firewall and then 3 spaces. So going from the drivers side do you fill in the 2nd and 4th hole and the middle hole in the next row down? Which hole does the vent tube go through? Hope that makes sense. But Ive got a bit ahead of myself I read the float mesaurments are 41mm 51mm. How do I adjust or set this I searched through this thread but couldnt find it.
I have 4 into 1 extractors and 13/4 exhuast with sports muffler.
9inch open filter but will soon be putting on a snorkel as soon as I figure out how.
Nik

[JrZook]

alien said

Posted: Tue Jul 26, 2005 12:49 am

--------------------------------------------------------------------------------
the hesitation you're talking about... does it happen if you slowly apply the accel?

mine has this hesitation also - but only if i plant my foot/put it down heavy - seems to flood a little.. more pronounced on cold mornings when its choked, or still cold. i find a quick tap of the pedal before dropping the clutch remedies this.

may just be a side effect of the larger carby?


i have this same problem with my standard carb on a 1l f10a only nothing seems to make it better it also starts to breakdown reall bad when you stick the boot in any suggestions

That could be a blocked main jet, or accelerator pump problem.
Im not too familiar wif the f10a carb, but it is a sidedraught?

[spook_95]

JrZook wrote:
That could be a blocked main jet, or accelerator pump problem.
Im not too familiar wif the f10a carb, but it is a sidedraught?

yes it is a sidedraught carb is that a prob or no?

[JrZook]

JrZook wrote:
That could be a blocked main jet, or accelerator pump problem.
Im not too familiar wif the f10a carb, but it is a sidedraught?

yes it is a sidedraught carb is that a prob or no?

No no the sidedraught is an awsome offroad carb and very simple. Pull it apart and give it a clean out and see what u find

[NIK]

Where can I find out how to set the float level,I searched and tried the parts shop they said you bend the arm the float mounts on. Is this correct?
Nik