SU Carb Technical Articles
Various articles and how-to's.
59 topics in this forum
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Thanks Bruce for the clever trick of using rubber around an SU needle to gently hold it in a vise to remove (when stuck)!!! Worked like a charm... I just used the fuel hose as the rubber buffer. @Captain Obvious
Last reply by siteunseen, -
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- 9 replies
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Jet Drop.mp4
Last reply by Captain Obvious, -
- 1 follower
- 4 replies
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Hello....I have the gas tank out and am sending it out to be cleaned, sealed and painted. Do I want to have some of the vents brazed shut...? If so, which ones...? Thanks...Riley
Last reply by grannyknot, -
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- 5 replies
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Thanks to @Lumens for providing the 1973 Nissan TSB's! The TSB's include interesting flat top Carb info presented below. The great Flat Top expert and car restorer @Zup may enjoy these!-image.png- 1973 Flat Top Carb Info from TSB.pdf
Last reply by siteunseen, -
- 1 follower
- 9 replies
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https://www.youtube.com/watch?v=pOd9WsNmz2Q hi please watch the video and let me know your opinion and how center dismantle and reassembly the JET ( if is correct name ) the parts under the carb that go down and no return in up in appropriate mode. thanks
Last reply by JUSTcrZn, -
- 3 followers
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I need some help. I have fiddled with cars for the past 5 years but it has mostly been on newer models, like jeeps and broncos. mostly suspension and body work. i recently bought a 260z. it runs and drives fine but it smells really rich driving down the road. it doesn't bog down or loose power at any rpm. i never really messed with carbs before. i Have a haynes manual and i tried fiddling with the air fuel mixture screws but it didn't really do much. I like to think if i tuned it right i can get some more power out of it. also i wont be choking on fumes. Side note i bought it in colorado and brought it back to new mexico. should i re-jet it? if so it didn't tell me how. A…
Last reply by Warrrenoh1, -
- 1 follower
- 1 reply
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Just received my carbs from Jeff Palya at Paltech. Look sooo nice! Don't If I should hang them on the wall or the manifold!
Last reply by siteunseen, -
- 1 follower
- 9 replies
- 3k views
I have an extra set of 3-screw roundtop SU's from a '72 240z, along with the E88 manifold/spacers, balance-tube, linkage, heat shield, and K&N filters that I'm looking to sell in the near future. They've been rebuilt with the ZTherapy rebuild kit (needles, gaskets, nozzles, etc) and cleaned up very well. They're not show quality, but they're very nice looking and perform very well. I've been running them on my '72 to ensure they're properly tuned. Basically a good setup for someone looking to convert from flat-tops or EFI over to round-tops. What is the current going rate for a setup like this? Just wondering if its worth keeping them or selling them. Th…
Last reply by siteunseen, -
- 1 reply
- 1.4k views
Here's an interesting article on the 1908 Union (SU) Carburettor. "The Motor Car Journal" May 2nd 1908 https://books.google.com/books?id=KGIfAQAAMAAJ&pg=PA212&lpg=PA212&dq=union+carburettor&source=bl&ots=36OhmQgNzw&sig=75Ti_6Y_S25oSwLwUudl9WYQoaQ&hl=en&sa=X&ved=0ahUKEwjXipn438TRAhVBsVQKHbPkDT0Q6AEIQjAJ#v=onepage&q&f=true
Last reply by esmit208, -
- 1 follower
- 19 replies
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Any suggestions on how to unplug? Searched and some folks said compressed air, tired that from either end disconnected from the tank and the rail, nada. Someone else mentioned small wire. Where you getting piano wire from, hobby store?
Last reply by grannyknot, -
- 4 replies
- 4k views
So I had reason to read a book on SU tips and tricks a couple of weeks ago, and came across an interesting tidbit that I need to share. It talked about piston movement and how venturi vacuum makes it move according to load. Great. Then they mention the special case where the piston is all the way down, like at idle, or at startup when the flow rate is so low that the DeltaP over the bridge hasn't gotten high enough so that the pressure diff can't move it yet. The piston has to be held mechanically slightly off the bridge to allow SOME air to get through. How is this accomplished? WIth this apparently long forgotten item on the bottom of every piston. …
Last reply by Captain Obvious, -
- 3 replies
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I have a 12/70 71 240z that i bought recently that runs like crap. I do not know the past history of the car or the past owners so I'm starting with a running car that runs, but not great. I have been replacing old parts these last few weeks and in the middle of a tune up. Removed funky electric fuel pump and switched back to a mechanical pump, new fuel filters,new spark plugs and wires, ign cap and rotor, I have not yet done a compression test on the motor. I have fuel going to the carbs and can start the car by pulling the manual choke when cold like normal, but after the car warms up and I open the choke fully the car starts to idle rough and dies out almost like …
Last reply by Mark Maras,
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