Carburetor Central
If you have questions about the SU Carburetors, this is where you can find the answers.
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I've looked through the carby forum and the Z-Therapy site and can't seem to find the answer to this question. Is there any difference in performance between the three screw and four screw carbies, I know that one was used on early Z's and the other on late ones but I'm not sure about the performance issue. I have a three screw set on my project 260 and a spare four screw set that the previous owner of the 260. I would like to know so I can choose which to hold on to and which I should sell on.
Last reply by 2ManyZs, -
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- 6 replies
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I have a 73 240 and I think that its probobly time to rebuild my carbs. Every one I talk to seems to have an intense dislike for the flat top carbs. So I'm thinking that I might just want to pick up a nice set of used carbs. Either 71's or maybe some double webers seem to be more readily available although they are also a little more expensive. What do you guys think about the cost vs performace of these two systems. Or which set do you think that Ill prefer. I have helped to install 71's and that seemed to be fairly easy. How much more complicated are the weber 32/36s to install? Any thoughts or theroys are much appreciated, …
Last reply by smg1404, -
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I have a 73 240 with flat tops. My runs like it is starved fuel. It feels like I am running out of gas if I maintain a high rpm. So, I dropped in some fuel dryier and replaced my fuel filters, then I replaced all my vacume lines and just recently checked my fuel pressure, cause I figured that the pumps couldn't keep the float bowls full and to my suprise the pressure ranged from 4.4 to 4.6psi. At idle and under load. I was wondering at what point too much fuel pressure becomes a problem? I was also wondering if anybody knew what the spec on the fuel volume was? Thank you for your time, madsoul
Last reply by Doehring, -
Thanks for you help guys. It looks like the solution is pretty clear. I will look for some round tops and not the webers.
Last reply by madsoul, -
Triple SU's 1 2
by Zedrally- 18 replies
- 5.3k views
Triple Webber's, Miki's etc,etc. But are triple stock SU's a possible upgrade? Has anyone done it?:tapemouth
Last reply by Cuong Nguyen, -
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Hi I have these SUs that came with my car. My car has an L28 with triple Delortos but I was considering putting these back on to restore it's 'stock' appearance. Anyway I was just wondering if I someone could identify them as I beleive the 70-72 SUs are the weapon of choice when it comes to standard carbs. Thanks in advance. OzLime240Z :devious:
Last reply by ZmeFly, -
- 4 replies
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Do early 260z's need high pressure fuel lines? I'm replacing my fuel and breather lines. I picked a bunch up at my local Napa store, but then my dad asked me if the car needed high pressure lines... :stupid: Anybody know? Thanks!
Last reply by mattymatmat, -
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Hello, ok, my car is running alright, i am pretty sure it could be runnnin a hell of alot better tho, Ok i have looked and read about adjusting the mixture on these carbs, u know where there like turn it in till it seats then turn back out so many turns and so forth, is it really that simple?? It seems asthough some people make it see pretty hard to adjust these, i could however understand the unisyn thingy but is taht all there is to it, nto like completly simple, but somewhat simple.........???I don't know if u can follow that....so it isnt' that hard to adjust these right...
Last reply by laffeaux, -
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i'm sure this has been beat to death but i'm new to the z forum. i'm working on a friends '72 240 and rebuilding the carbs. they are the hitatchi w46's. the question i have is about the needle and seat for the float bowl. the carbs had two different types. one was kind of short with a needle and a spring loaded insert. the other was longer but the needle had a solid pin which the float pushed up on. the carb kits i got from checker have two different part numbers but exactly the same parts in them(?). can i use the same needle and seat in both float bowls? why is one different from the other? is this a factory deal or sign these carbs have been screwed with befo…
Last reply by clutchdust, -
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I was looking at the ztherapy page and noticed their rebuild kits for my 72 roundtop SU carbs. The price was like $150 for the set for both carbs. Is it worth it? I'v seen rebuild kits for a lot cheaper then that else where, but seeing as this company is specific in SU carbs, I figured they know what their talking about. (Plus I'd like to have the video that comes with it) But I was just wondering if this is the rebuild kits you guys reccomend? I'm also looking at their ported intake for my 72 240z. However, I am wondering, I will be putting a new engine in my car soon, and its a fuel injected 81 280zx engine. I think the general concensious is to dump the fuel injection…
Last reply by skip260z, -
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I have a stock L24 72 240z datsun. What carbs would be on it? I can take a picture if there is any question. What would be good for me. I want a little better performance, but I really want to stay on the cheap side of things for this car. What should I be looking into?
Last reply by AxtellZ, -
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Hi guys, I picked up a 1973 240Z about six months back that i've been personally restoring back to a "tasteful" level. The previous owner was a wonderful japanese fellow who took marvelous care of the machine. The only problem i've had with it since its purchase is what i thought was a carb problem. It has dual 1971 SU's, installed to replace the faulty 73 carbs. They were "professionally tuned" a year ago, which is why i was surprised to notice bad fuel economy, dark, gas-smelling exhaust, some occasional sputters and other tell-tale signs of a rich mixture due to unsynched/misadjusted carbs. So i planned on getting it looked at - until the #1 Zcar pro in the area told m…
Last reply by korg_geek,
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