who's got a weber on a sierra

Post by **built4thrashing** » Tue Jun 06, 2006 10:28 pm

WooHoo eight pages

The factory mechanical pump will supply enough fuel to a weber but what you need to do is lower the pressure so you dont force the fuel into the float bowl.

on steep uphills the fuel in the bowl will sit in the bolw at the needle and the float will drop allowing in more fuel to cover the jets. You may experiance surging an really extreeme angles but rear bumper would almost be touching the ground. /

You may have issues else where or have the float incorectly set.

Post by **NIK** » Wed Jun 07, 2006 1:35 pm

I have spoa with ome 50mm springs and a tube bumper so it gets real steep before the bumper touches. I set the float to 41mm-51mm as read somewhere on here but I havent addad a feul regulator. What pressure would you recommend? I havent got around to sealing off the bowl and adding a vent but this should only affect it downhill (carb backwards)
Nik

Post by **built4thrashing** » Wed Jun 07, 2006 7:06 pm

set pressure to 2psi for road use and 0.5 to 1 psi for offroad.

Post by **NIK** » Mon Jun 12, 2006 12:40 pm

No worries I,ll give that a go. I was looking at a old carb and was thinking maybe with the float set lower that when its on a steep hill I might be using the fuel quicker than its coming in as there would be less in reserve. Not sure if that makes sense, but its only started playing up since ive changed the float level and rebuilt it. So I,ll try raising the level a bit.
Thanks Nik

Post by **built4thrashing** » Thu Jun 22, 2006 7:16 pm

hey nik how did ya go with it running on angles?

Post by **NIK** » Fri Jun 30, 2006 3:55 pm

Sorry dont have much acess to a computer. Use to run great on any angle except down hill untill I lowered the float, then it sputtered up hill. Ive raised the float and sealed the top with a breather running into the secondary throat, I,l see how it goes have to put the gearbox back in first though.
Nik

Post by **built4thrashing** » Fri Jun 30, 2006 8:04 pm

breather fhould vent into primary throat. If stalling on up hills then turn the weber around so float is closer to firewall

Post by **smiley_smoke** » Sat Jul 01, 2006 2:07 pm

when you guys talk of breathers from the bowl can you snap a few pics for us please? just so when i pull my finger out and put the darn weber on i will have a bit of a clue..

cheers guys.

Post by **built4thrashing** » Sun Jul 02, 2006 9:15 am

i have a few pics but cant post them here ATM. pm me ya email and ill send them to ya

Post by **gwarness** » Mon Jul 03, 2006 6:46 pm

G'day all.

I just got my Weber 32/36 dgv delivered today. I was just wondering if someone would be able to send me some pics of their carbies and their carbie set-ups just so I've got a clear image in my head of what I've got to do. The pics posted on this thread don't seem to show up on my computer, so I've missed out on a bit of vital info. Could someone please help me with this? Cheers

Post by **built4thrashing** » Mon Jul 03, 2006 7:04 pm

HI GWARNESS
Try this link. you might have to sign up first
http://groups.msn.com/EXTREMEOFFROADPHO ... ierra.msnw

Post by **gwarness** » Mon Jul 03, 2006 7:32 pm

Cheers built4thrashing!! That link has some pretty good info on it. I've been reading through this whole thread, but it was hard trying to conjure pics of it all in my head, but this should all help. Hopefully all the info I've read, and re-read will sink in. Cheers once again!

Post by **built4thrashing** » Mon Jul 03, 2006 8:06 pm

the best way to learn is to have a go at it. if you have any dramas then im sure we can all help. Pm me if you have any probs

Post by **NIK** » Sun Jul 16, 2006 2:39 pm

BFT my carb is on back to front I think it was surging cause the float was to low. Raised it up and it seems ok now ( only been on the beach so far though). Would it make much difference which throat it was vented into?
Nik

Post by **built4thrashing** » Sun Jul 16, 2006 8:05 pm

yes. if vented to the secondary you can get a buildup of fuel behind the butterfly and then when it opens it can flood the engine.

Post by **gwarness** » Sun Jul 16, 2006 8:56 pm

Has anyone set up a manual choke with their webers? We were mucking around with the weber yesterday, we are putting a manual choke on it (didn't come with choke, got electric and water chokes from wreckers but don't think they'll bolt on, would prefer manual anyway). Can anyone give me some help with my situation and get me out of this predicament? Cheers.

Post by **smiley_smoke** » Thu Aug 10, 2006 4:46 pm

just thought whoever else is searching on webers and thinking of putting one on their zook like i am, you may like these links:

http://www.giant.net.au/users/wight/New%20Setup.htm
http://www.giant.net.au/users/wight/manifold.htm

as built4thrashing has mentioned its best to modify the manifold for airflow by cutting a section out.. i thought these pics are handy.

also talks a bit more on webers compared to a standard carby in this case it is a nikki gemini carb but either way

Post by **NIK** » Mon Nov 27, 2006 9:06 pm

I know this an old thread but I have some updates and guestions.
I was still having problems on steep up hills and then at a club drinking session (meeting) we realised I had a pusher electric pump set up to pull from the tank all the way to just before the carby. So I set it up to push from the tank and while I was there I replaced the filter. It wasnt that old and Id had the tank cleaned about a year ago but the filter was chockers with what looked like mud. After changing things round it ran a bit better uphill but not much. So I put the mechanical pump back on and it runs better still (I think the electric one has just about had it). Now at the base of steep hills when you accelerate it bogs down for a few seconds then powers to the top no worries.
Could it be starving for fuel at the start as the fuel moves away from the jets (carb backwards). Does anyone else suffer this and how did you fix it?
I also have cd2 stromberg side draught with a bottom mounted bowl anyone have experience with these and would it run the 1.3?
Thanks Nik

Post by **built4thrashing** » Tue Nov 28, 2006 6:10 pm

if it boggs down right after idle then it is most likely your primary idle jet is too small. Most webers do hesitate at just off idle. I run a 70 as a prim idle jet.

What jets are you running it the rest of it including e/tubes?

Post by **NIK** » Wed Nov 29, 2006 8:02 pm

Im running
Prim / Sec
idle 60 / 50
main 132/ 135
air 170 / 160
e 3.5 / 4.5
I spoke to a carb shop and the recomended I drop the prim main to 125 but I lost too much power they said the rest is about right though.
Whats your thoughts on fuel running away from the jets on hills?The carb shop said thats probly why it runs rough uphill. Another thing I discovered the manul says to set the float at 41 to 51mm but the bowl is only about 49mm deep.
Thanks Nik

Post by **built4thrashing** » Wed Nov 29, 2006 8:49 pm

you have 3.5 /4.5 aux venturies but havent said what the e-tubes are. E-tubes are located under the air jets. The float is kept low to allow for the angles.if fuel level is too high it will flood easily on even small angles.
Ya jetting is about right but id adjust ya float and increase the primary idle jet a bit. If it doesnt work just go back to how it is now

Post by **NIK** » Thu Nov 30, 2006 8:02 pm

Thanks b4t I cant remember what e tubes I have but I think they are similar to what you are running. Question for you what role do the e tubes have in the carby?
I hear what your saying about the float level but with the bowl sealed with the raised vent tube would it still flood? From lots of messing around a mechanic and I thought it would stare for fuel on hills as the jets wouldnt be in as much fuel.
Thanks Nik

Post by **built4thrashing** » Thu Nov 30, 2006 8:24 pm

as you tilt the carby (fluel bowl up) fuel will pour out the aux venturi's. By lowering the ammount of fuel in the bowl (so it just covers the main jets) will allow for more angle before fuel pours out the aux vent's.

E-tubes control when the fuel mixes with the air. search some USA forums for anything written by SARGE. he is the GURU on webers

Post by **JrZook** » Mon Dec 04, 2006 12:45 pm

Went for a run on me mates dyno yesterday.
Zuk pulled 45.9rwkw!!!!!!!!!

That was at 65kph in a 2nd gear pull.
Also the big suprise is my jetting on the weber is very very close to perfect! Was running at 12.1:1 air fuel, idles at 13:1.

Post by **built4thrashing** » Mon Dec 04, 2006 10:00 pm

thats good to hear JrZook. What is your jetting atm? Post as many details as possible so we can set others right.

Post by **JrZook** » Mon Dec 04, 2006 10:57 pm

built4thrashing wrote:thats good to hear JrZook. What is your jetting atm? Post as many details as possible so we can set others right.

No woz mate.

primary/ secondary

Idle 60/50
main 145/135
air 160/170
e-tubes F50/F50
aux venturies 3.5/4.5

Now thats on the 'big block' G13A with extractors and 2inch system.

Fellas with that stumble of idle, I dont know if your 32/36 is exactly the same as mine but i found that the problem is NOT the size of the idle jet, its the height of the transistion ports to bring the main jet in. Mine were about ~1mm above the butterfly when it was closed, hence the lean stumble until the air velocity was fast enough to bring the mains in. To fix this i simply popped the welsh plug out of the side of the carb and drilled another small transision port lower so it was in line and covered by the butterfly when it was fully shut, so as soon as the butterfly is moved just of idle that port is exposed straight away. Pulling the main circuit on a lot quicker.

Cheers Dan

Post by **built4thrashing** » Tue Dec 05, 2006 9:36 pm

that makes sense to me but prob doesn't to others. did you fill in the existing hole? im guessing ya did otherwise it would allow for leakage and over fueling.

Post by **NIK** » Wed Dec 06, 2006 4:31 pm

This sounds interesting, Im trying to visualise it without the carb infront of me and Im lost. Any chance of pics or more indepth discription?
Thats good power from a 1.3. When I talked to "experts" they all say why do you want to put larger jets if the carb came off a bigger motor original, they all said I should be putting smaller jets. I even got angry service from the parts guy cause he disagreed with the need for bigger jets.
145 is a big main though but if it runs good and there power is there go for it :-) I found anything over 135 made no difference in power but used more fuel.
Nik

Post by **NIK** » Tue Dec 12, 2006 8:11 pm

I drove my zook to work the other day and it ran fine on the way there but on the way home it ran like crap like it was starving for fuel at cruising speed ( 90- 100 ). The first look at it the filter in the inlet of the carb was FULL of crap looked like mud. I didnt check the main filter because I changed it about 2 months ( lots of mud in it ) ago and I only drive it on weekends. But afer this it ran even worse so I replaced the main filter ( it looked pretty dirty ) and it ran good after that. But I did notice it still stuttered under load on big hills so maybe the stock pump ( brand new ) cant get enough fuel to it?
So my question is could dirt somehow be getting into the tank or do you think Im just getting crap fuel. The tank was cleaned about a year ago.
Another question I read that the float levels are different for plastic and brass floats. Brass is 41mm to 51mm and plastic is 35mm to 51mm. I have a plastic float but have it set to brass levels. Has anyone else experimented with this?
Thanks Nik

Post by **built4thrashing** » Sat Jan 27, 2007 6:57 pm

Its been a sad weekend for my zook. The weber carby that has so far served me well had a terminal problem. It apears that the shop that re-built it didnt put shims or new seals in the throtle shafts and now i have a massive vac leak that almost makes it undrivable..
So im gonna start looking for alternative carby options. Will start a new post soon with details and stuff of my choice and how it goes.

If anyone has any weber questions still feel free to ask me.

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