Carburetor Central
If you have questions about the SU Carburetors, this is where you can find the answers.
Subforums
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1,458 topics in this forum
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First of all, I recently purchased a 74 260z from a gentleman, the car is everything i've wanted in a Z car, with the exception of a running engine. I've read up TONS of "Search button" topics, and looked all through diagrams of these darn carbs but cannot seem to figure the damn things out. The carbs that are on the car are a set of 3 screw bottle top SU's, im assuming late model 72's that the gentleman put on there, when i bought the car, he said i could fill the bowls of the carbs up with gas and it'd run like a champ and that it had only sat up for long enough for the gas to go slightly bad, but the fuel pump wasn't kicking on, so what i did was after purchasing said…
Last reply by madkaw, -
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Hey so as you can see the black smog/balance tube has been hacked and chopped (its a junk yard build). My plan is to take off the rail completely and cap off the intake runners leaving only the booster vacuum hose on the rear intake runner. Then attach the crank case hose to the intake filter housing and plug all the exhaust manifold holes. Would this work or do i need to weld a tube connecting the two runners?
Last reply by Zforce, -
- 16 replies
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My duel SU round top 3 screw runs crappy and is backfiring through the exhaust when you pull your foot off the pedal(deceleration) what does this mean, does it mean it is running rich? Any help would be appreciated. It is also running rough and seems to want to stall. I just adjusted the carbs and float.I set the floats at 9/16 they do not suck full at that point but begin when the float starts to drop, I used the FSM for the carb sync. any ideas ZDUDE1967
Last reply by Bruce Palmer, -
- 6 replies
- 4.4k views
So after rebuilding my Webers, I am having a problem with getting the car to rev at tip-in of the throttle plates. I added back in a stock mechanical fuel pump and at the tank I have a non-stock electric fuel pump. Previously, the fuel return line was blocked off and the fuel was dead-head banjo'd into the last carb. I now have the fuel returning to the tank. I have no choke set-up so it is cold blooded as hell until it warms up. What are you other guys with triples doing? Silverstreak is using an RX-7 E-pump at the tank. Some seem to think that the mechanical pump can't be used because it can't feed the triples. Others say they run the mechanical in addition to the E-p…
Last reply by cygnusx1, -
- 8 replies
- 2k views
are the 280z runners larger than the 260z? I found 2 pristine SU's but they have the 260z runners.
Last reply by Darkwolf, -
SU Mixture Question 1 2 3
by Oiluj- 26 replies
- 6.3k views
Background Info: The engine idles reasonably well, (given the stage 3 cam), runs fine and temp is stable at 180F, even on hot days. Mixture nuts are set at about 2-3/4 turns each. My colortune shows my mixture to be about right, measured at plugs 2 & 5. Timing is set at 7 BTDC & carbs are balanced. Reading recent posts, I got "curious" and tried lifting the pins that raise the carb pistons. For both carbs, the engine stumbles badly... Not what it's supposed to do. Even when I increase mixture 1 full turn on the mixture nuts, it still stumbles. I do have the larger jet needles to accomodate the bored & stroked 2.7L L24. Question: So what do I bel…
Last reply by beermanpete, -
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I have a 73 240 with webers that have been on my car for at least 20 yrs. It has been sitting for about 3 yrs with occasional starting. I have not been able to get the motor able to go on the road due to the carbs dribbling fuel while running and cant get it to idle without the the choke on. I have had the carbs rebuilt but not by a specialty shop and they still do not operate correctly. I have taken the tops off myself to check the float level and still not able to get them to run well. I am thinking of buying two new carbs but i would rather spend the money on other parts for the car when I have two possibly good carbs allready. Felling very frustrated, Any feedback wou…
Last reply by Craigasoarus, -
I am at my wit's end and need help on my 260Z race car. Ever since I got the car two years ago, I have had issues at high RPM and after trying lots of things, I'm pleading for help. Here's the engine background... L26 engine just rebuilt with new rings, valve job, and a mild cam Thermostat guts removed leaving only the ring and cage for a restriction Prior to rebuild a few weeks ago, it was 100% original 3 screw SU's with SM needles, floats set to spec and chokes working smoothly and carbs synchronized. N36 intake Previously used OE needles in carbs New mechanical fuel pump with 260Z electric pump removed Previously tried another new mechanical pump and an electric pu…
Last reply by Jeff G 78, -
- 8 replies
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Am looking for ideas for an improved fuel rail for my carb set up, one that looks cleaner and may have fewer touch points on the engine to heat up the fuel. Any ideas or thoughts? Thanks!
Last reply by Duffman, -
- 10 replies
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hello everyone, i searched around and haven't seen anything related to my issue, i was wondering if anyone has ever just removed the stock airbox and air filter and just placed two cone style filters filters in its place... basically as seen like this kit: http://www.thezstore.com/page/TZS/PROD/PFFC20/11-4010KI will it do the same thing? if were to just mount two cone style filters? or is there more to this kit than just the air filters thank you
Last reply by Duffman, -
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I saw a listing on craiglist a N33 intake manifold for sale with remove emission..is this ideal for SU carbs and same performance as N36 intake?? Please let me know your opinion before i get them..
Last reply by pat furlan, -
- 12 replies
- 1.8k views
It's fun watching the wideband guage as the weather changes. Here in Indiana we just went from super hot and humid to 65 and no humidity and I watched her run lean. I have always kept it on the lean side, but WOW she really went lean this week. I fattened her up a good half a turn on the mixture nuts and boom -baby, it was a different engine. This to me is all the justification I need for all the work I'm putting in on my CAI for my Mikunis.
Last reply by Jetaway,
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