Carburetor Central
If you have questions about the SU Carburetors, this is where you can find the answers.
Subforums
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I am having one heck of a time getting my 240 tuned up. I have a 72 with 3 screw SU's, and E88 intake manifold, pertronix ignition set to 17 btdc, and new NGK plugs gapped to .032". On top of that I have replaced my fuel filter, added all new rubber lines, and thoroughly blown out the hard lines. Also, I have 20 wt oil in the dashpots. Before I figured out Bruce at Ztherapy was the way to go I picked up some GP Sorensen carb rebuild kits and replaced all of the seals in my carbs, cleaned the screens and reset the float bowls per the rebuild kit instructions. Which at the time said 14.28 mm, this allowed my car to run with the choke open, but I could never get the car set…
Last reply by hogie, -
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- 3 replies
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hello all, I am a fellow Belgian 260Z owner. My 260Z is overall in very good condition, it runs well at all speeds but I notice a large lag when revving at lower speeds. After browsing to these forums, I decided to ditch the Flat Top carbs and replace them with proper SU´s. Because my engine is fairly stock, I will not go for triple webers. - I will order the 260Z SU conversion kit from this guy: http://www.paltech1.com/ this is way cheaper than over here in Belgium. It would cost me over 900 dollars (euro). Any way, I would like to know what I can remove and where to put the cables after doing the conversion. I added a picture of my engine bay.
Last reply by H3nrY, -
Ok I recently bought a set of Dellorto 40 carbs for my 240z.. Then engine is a stock L28E long block with headers and exhaust. I need to know what should be the correct jetting for these, Im trying to find out what the ballpark figures should be before i bolt them up and have drivabilty issues.. I know its not really possible to say what exact sizes should be used do to sea level, location and the weather but i think any experienced tuner could give ball park figures to work with. With all that said the carbs are Tuned with 32 chokes, 57 idle jets, 132 main jet, 180 air correction jet, 38 pump jet and #11 emulsion tube and 5 progression holes.. How does this setup so…
Last reply by Zs-ondabrain, -
- 14 replies
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After 2.5 weeks of waiting, my new carbs have arrived! I decided recently that I needed to kick start things with the Z and do something to get me excited about working on the Z again (although the sun coming out really helps lately), so I called up Ztherapy and ordered a new set of carbs and a new balance tube. Next week is dead week and finals the week after that, so it's likely that I won't be swapping anything till spring break. Until then I'll just have to enjoy looking at these beauties.
Last reply by JonnyRock, -
- 9 replies
- 2.9k views
I have yet to dig into the wonderful world of SU carbs and have a general question. What does it mean when a carb is lightly smoking? Right now, the carb closest to the firewall (I believe that is considered the rear carb, please correct me if Im wrong), smokes at idle. Its very light, and I can see just small wasps of white smoke. What does this indicate? There isnt any backfiring, and the car runs well. No hesitation and excellent drive-ability. According to my A/F ratio gauge, I'm running just slightly rich (exhaust mounted wideband o2 sensor). Any help/insight as to what this indicates would be greatly appreciated.
Last reply by TBone028, -
- 9 replies
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I purchased and watched the ZT DVD Friday evening. That DVD is very informative and thorough. I felt very confident disassembling my carbs and getting them up to spec. The float bowls were very dirty and the floats tabs had the floats sitting at the very top of the cover (no wonder this car was barely running). I had them completely cleaned, adjusted and running in about two hours. I followed the sync instructions which is the same procedure as I used 25 years ago. I also got the same result that I got 25 years ago; I found that the engine runs smoothest at an idle rpm of 1,000. I started with the mixture knobs set at 2-1/2 turns out and the high-speed balance screw on th…
Last reply by Gary in NJ, -
- 14 replies
- 1.8k views
Had a new customer bring his Fairlady Z to the shop this morningto have a new set of 38mm carbs installed. The car is stellar having been owned since 73. The gentleman's name is Weber which has me asking the obvious question, do Webers really prefer SUs? Anyway, hopefully you'll be able to see this car at Canby.
Last reply by GreenZZZ, -
- 4 replies
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I have a '73 240z that I turbocharged back in the 70s with a Crown turbo kit. The Crown kit specified using the front carb only. It took allot of creativity to get the flat top Hatachi carb rich enough. But it ran very well; very few cars could stay with it. A few heads, blocks, and pistons later, It ended up with an O-ringed 280 block, 280ZX trubo head, mechanical cam conversion, Shrick cam, TRW forged pistons and cleavite bearings. It has also demolished 3 transmisions, a couple of stub axels, and hundreads of clutches. Currently, it has a Centerforce clutch and aluminum flywheel that has held up well. The float failed about 15 years years ago. Replacements were o…
Last reply by totenkraut, -
- 5 replies
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I looked up the oil for the cabs in the Haynes repair manual it stated to use SAE 30 oil however some post here said to use SAE 20 like a 3 in 1 brand. Which should I go with and how much does it need. What happens if you overfill it- would that lead to head in hands regret?
Last reply by Bruce Palmer, -
Air Cleaners 1 2
by d240zx2- 16 replies
- 4k views
Getting ready for a track day on the 15th, so I thought I'd re-sync the 40mm Mikunis. To do that, I have to pull the K&N filter assemblies and bolt on the air horns, as the Uni-Syn won't mate up to the backing plate for the K&N filter assembly. After getting the sync done, I decided to take the old gal out for a bit of a romp before reinstalling the cleaned filters. Holy Moses! Did somebody put a 2.8 in the car today? The difference between filtered air and non-filtered air is phenomenal! That's all I can say! The sync wasn't off all that much, so I can only attribute the increase in performance to the lack of filtration/horns. Now to my question: Given the incre…
Last reply by pbarcher, -
- 1 follower
- 27 replies
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Ok I got a set of Triple Mikuni 44's recently see my gallery if you like. They came with what I believe is a short manifold so the runners look a little more bent than the long runners of a long manifold. I'm wondering what the opinion is on these manifolds and how the length affects performance. I would believe that the longer runners would increase the torque of the engine but the shorter runners look a little restrictive with the bend in them. However having read a few articles on porting and air turbulence this might be the aim of the short manifold. To slow the air just enough and reduce the turbulence before entering the combustion chamber. The manifold itself is a …
Last reply by byunique, -
- 5 replies
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Does anyone have a baseline recommendation for triple 40DCOE's on a stock 280Z (L28)? The 240Z is well documented. Not the 280Z. Feel free to throw some suggestions or combinations that work, or just keep an eye on my notes as I set it up by ear. I have performed all the basics: throttle plate angles, idle speed, best lean idle +1/4 turn rich, synch, float levels.... Here are my notes so far: 240Z Running with stock L28E and Triple Weber DCOE40-151 carburetors. Date-4/10/10 125/F11/170 55F9 28mm choke 4.5mm aux choke Comments: Starts, Idles well when warm, runs smoothly, low on power above 3000rpms but runs great, stalls on quick application of heavy throttle below 27…
Last reply by cygnusx1,
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