Carburetor Central
If you have questions about the SU Carburetors, this is where you can find the answers.
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1,458 topics in this forum
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As I continue to learn the many joys of tuning and balancing SU's, I got the thinking about my dashpot oil. I have always used straight 20W motorcycle fork oil. It seems way too difficult to lift the dashpots (enough force that my wife couldn't lift them) when the engine is cold. My most recent tuning/tweaking attempts have me running very strong right through the powerband, up to about 5,500 rpm, but I have the slightest bit of hesitation when I back off the gas (for cornering, etc.), then get back on it. Could this relate to the viscosity of my dashpot oil? I have read recently about some people using a combination of 20W or 30W oil cut down 50% with light oil. Con…
Last reply by Bruce Palmer, -
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- 28 replies
- 4k views
Ok Here's a new one on me, I can only get the car to take 1/2 a tank of gas, like 6 or 7 gallons. At that point the fuel is topped off at the neck. Anyone see this before? 73 240Z, standard 15.9 gal tank with all new tank plumbing to expansion tank and motor. I understand that new doesn't mean good, and I may have missed something. Any ideas before I have to dig through the hole hose thing again would be appriciated.:stupid:
Last reply by Darrel, -
- 25 replies
- 12.6k views
I have a 72 with the surging accelerator problem. I got a new bellcrank and throttle rod so I could perform this modification. I'm not a welder and was wondering how anyone else has done this mod without welding? It looks like I can use my Dremel and saw the arm off the weld but I'm not sure how I would attach a washer to the bellcrank. Attaching the arm to the washer I can see, but I don't see what I would screw to with the washer. Any ideas?
Last reply by zKars, -
- 12 replies
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Hi Got my 240 today and it seems to be idling high and very rich and smelly How do I adjust the idle and will this in turn adjust the mixture?? Or how do I adjust both idle and lean off the mixture? You help would be greatly appreciated. Will post up pics soon...car now registered here in the UK having spent its 41yrs in CA.
Last reply by Vipergts, -
- 8 replies
- 1.8k views
On my 73 240z, I'm having problems keeping it running. Starts up fine but dies after it warms up. Acts like vapor lock. Anyway, I have new fuel filters front and back, new mechancial fuel pump and stock electric pump in the back. I thought the return line might be clogged so I blow air thru the return fuel line and after the pressure built up fuel started coming out of my fuel rail from the spot I removed the return fuel line. So as the air goes into the tank it forces fuel back thru the feed line. I did not think this is a closed system. Oh yeah I have z therpy 3 screw roundtop carbs. Any ideas on what to check next. Can not drive the car now and spring is here.
Last reply by manny1973, -
- 7 replies
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I just installed a MSA 3-2 header and exhaust system on my 1972 240z and now my idle is too high. It used to idle around 800 rpms, now it idle around 1200-1300 rpms. Overall it seem to run great. Just idles high. Is there a quick idle adjustment on these SUs ? Any help would be greatly appreciated. I know there is tons of info. already in this forum, but it is very hard to find any specifics... Thanks again in advance
Last reply by LeonV, -
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First of all, I know zero about carbs...my motto was that I always wanted to know a good carb guy, but never wanted to be one...except my carb guy retired and moved to the lake, so here I am. I put triple mik 44's on my stock 72 240z for show purposes. And it worked, I was in six shows and got six first places. Mission accomplished. But I gave up the fun of driving, in order to have a car that looked and sounded pretty sweet. I'm now going to remove the Mik's and put "something" else on. Don't know what the something is. I see a lot of posts about Z-Therapy, but I also see these Weber's on Zcar parts: http://www.thezstore.com/page/TZS/CTGY/PFFC02 What's the diff between…
Last reply by Hybridz-KY, -
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I'm trying to plug the 3 ports on my crossover tube to delete the smog stuff on my 72 with a 75 engine and mix of SU carbs. Can't seem to find what will go into these and close them up.
Last reply by mr mikey, -
- 11 replies
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I am on the hunt for a rev limiting problem (stops pulling at 4.5k)... Seems many others have had this problem, currently I am just eliminating possibilities one at a time. I doubt this is my problem but I just want to check... I can't seem to find good documentation on how far the needle is supposed to be protruding out of the piston... Currently the lip on the needles is about 2-4mm out of the piston. Can someone point me in the right direction or tell me how to check that mine are correct? Thanks!
Last reply by VaGuS510, -
- 5 replies
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Bruce Palmer, Z Therapy, made the comment on another thread about how effective the original airbox is on the Z, especially if you extend the air intake to the front of the radiator to draw in cooler air to both carbs. This made me rethink my current set up (K&N tuna cans) and put some thought to some plumbing ideas to make the original airbox arrangement more effective. Living in the desert heat makes me sensitive to improving the airflow to my SUs! Would those of you with customized cold air intake setups with the original airbox care to display your work? Any ideas on companies that provide the best setups? Open to any thoughts on this. Thanks!
Last reply by gnosez, -
- 1 reply
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Folks, While digging around the junkyard today I came across what I wrote down as an E48 intake manifold. It was inside a 1971? 240Z (for sure) along with parts obviously not from any 240 -- 280 Z through ZX and others that may have been from a Z. It was a Nissan, dual carb, for a six-cylinder. Compared with the E88 on my 1972 it was very sparse, as a descriptor, I guess. Had a balance tube but I don't think it had a provision for coolant pass through. The runners were also more "tube-like" than on the E88. I couldn't find a reference to it here, though there were discussions of an E46 manifold. Was this an E46 that I just wrote down wrong? If not, is it for a Z? …
Last reply by Bruce Palmer, -
- 9 replies
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Hello, I finally bought a very nice (pristine interior and minor rust) 77 280Z. Being that I am a carburetor guy (if for no other real reason), I am converting the FI to Carbs. So, I have been looking for the non-emissions early SU-Hitachi carb. However, since I also own a 1964 Volvo 122, I have a reasonable share of HS6 and HIF SU carbs. And this got me thinking about whether I could fit a set of HS6 to the Datsun… Has anyone done this before? This may be uncharted territory, but I’m quite comfortable there. If anything, this may just be a fan project. Thank you, Marco
Last reply by Bruce Palmer,
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