Carburetor Central
If you have questions about the SU Carburetors, this is where you can find the answers.
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My car has been running fine since i finally managed to adjust both round top 3 screws su carbs. However, i do sometimes noticed that if i suddenly bump with the choke lever in the console, the yellow lights comes up. I decided then to move the lever up and down to see what happens. WRONGGGGG!!!! Now the cable got worse, the lever wont go up all the way as it did before and if i start the car its too cold. I tried tightening the screw in the console but it did nothing. Should i take the air filter out and unscrew both cables fastened at each of the carbs to see if it releases the pressure and goes back? I have never adjusted these choke cables before, i have left this iss…
Last reply by siteunseen, -
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- 11 followers
- 154 replies
- 26.7k views
I'm getting ready to put the motor back in after a YEAR!! My dumb a** thought it would be a few months. Anyway, I'm getting the fuel supply worked out. Drained the year old gas from the tank, flushed the carbs then checked the float levels with clear tubing. Question? They're mounted level on a wall and the rear has a taller float valve (actually doubled up washers) so could you all look at my pictures and tell me what you think? The front is a little short but I think that may be because of the way they're mounted, level. I cut out the rotten fuel line under the battery too. Found a small pin hole. That stuff looks like zinc plated cop…
Last reply by Captain Obvious, -
- 3 followers
- 45 replies
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As I march towards first road test I've come across a few unexpected things I'm dealing with, one I think is a too rich mixture. I say that because I changed the plugs and man they were sooted black as coal. This engine was rebuilt by the PO about 3 years / 2500 miles ago so I'm going to give some leeway here as I am trusting it was done right. I know what they say about assuming lol, but its a starting point. I've read a bunch of material on how to balance / tune the carbs and most people say start with the emissions before attempting to balance the mixture. So I changed the pcv valve (the old was barely working i see after it was off) and was attempting to change t…
Last reply by Richie G, -
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Finally i managed to replace the Far 311 Race Cam with the following smoother cam manufactured by Schneider: http://schneidercams.com/274FL6.aspx I also changed the springs, .175 lash pads, retainers and rocker arms (the full kit). In addition to this my carbs were recently remanufactured by Z therapy in order to avoid any issues. I plan on installing an AC system so using a cam that went from 4500 to 8500 wouldnt work. Anyway, i just tested the car yesterday, and have a couple of queries on its performance: 1. The choke cable when pulled only reaches 1,500 RPM at idle. Is this okay or should it be adjusted to 3,000 RPM when pulled? With the Far 311 Race Cam i man…
Last reply by jalexquijano, -
- 4 followers
- 7 replies
- 288 views
After successfully installing that AB Valve from @zKars I just noticed I have 2 bolts plugging openings on my balance tube. Seemed strange to me and was thinking the PO removed some emissions equipment but all the pics I'm seeing and FSM show the tube without these openings. Did the PO grab a later year one? Or maybe this car had some accessory like AC? I did see in the original console the typical holes where ac controls would go but thought maybe he just parted out a console. Any thoughts? Any reason to bother replacing that tube?
Last reply by Terrapin Z, -
AB Valve Question 1 2 3
by Richie G- 3 followers
- 30 replies
- 931 views
Working my way through the engine bay and starting to take apart and get ready for some work replacing the mess of hoses left by PO. I took the AB valve and corresponding hose off and a bunch of what i would say looks like petrified carbon fell out. Some of it is typical dust and small particles but a few are large and pretty "square" so I'm wondering if this is some sort of broken diaphragm, or gasket or something in there? Or is it just carbon that formed this way? Last i had the car running about 6 months ago I don't recall any backfire, how would I know if this valve is still good? Or is there a way to disassemble and clean it? BTW search seems to be down so…
Last reply by zKars, -
- 3 followers
- 26 replies
- 1.9k views
I've been looking for a good throttle cable kit for my 73 240Z with SU's, but couldn't find any. I heard MSA had one, but no luck finding any links or info. There's an ArizonaZCar instructions link I kept seeing, but link is broken. So, seeing nothing available, I decided to build my own. Actually, I put together a few kits (9 more left) thinking maybe others might also be interested. You provide the cable kit, but you decide if you want to spend more for a Lokar cable, or a cheaper $20 Amazon knockoff. The design objectives were: Use of readily available 24" universal throttle cable kit (you provide). No junkyard rummaging needed. No weld…
Last reply by KenFirch, -
- 6 followers
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I thought you guys would to see what my friend is doing to put bearings in the su bodies for the throttle shafts.First he made a fixture to hold body in a machine block on a mill
Last reply by Captain Obvious, -
- 3 followers
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I am now going to attempt to take off the old non working flat top SU carbs and put in the round top SU carbs can someone please tell me which lines must stay and which lines can go and/or is there a step-by-step instruction on how to do this I have not seen any any videos on the swap or any step-by-step instructions on the swap. I need to buy any extra parts or can this be done with what is there between the two sets of carbs? I have another manifold that goes with a round top carbs. Do I just takeoff the manifold that’s on there now and put on the round top carbs on the manifold that I have with them or do I just take the carburetters off and put them on the existing m…
Last reply by Zed Head, -
- 3 followers
- 12 replies
- 448 views
Can someone tell me if these flat tops have an easy to access bone desolate screw? I just want to drain the bowl.
Last reply by Captain Obvious, -
carb oil leak 1 2
by kully 560- 3 followers
- 18 replies
- 1.1k views
I need a little help from the forum again, I have 1971 4 bolt su carbs that seems to have a small oil leakage from the mixture nut. not bad but when I adjust the mixture my fingers get wet with oil. is there a o-ring in there I can change? also can it be done with the carbs still in the manifold buy removing the assembly from the bottom of the carbs? thanks
Last reply by kully 560, -
Ever since I bought these new webers nothing has worked quite right. I am starting from scratch. Again. want to get my float squared away before I touch another dang think. Where are my Weber heads.
Last reply by Zedyone_kenobi,
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