Carburetor Central
If you have questions about the SU Carburetors, this is where you can find the answers.
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1,450 topics in this forum
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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, -
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- 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, -
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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, -
- 6 replies
- 1.8k views
Just recently got into a 240z '72. 280 motor installed, but original '72 3 screw round top SUs. Drove it for a bit to find that it was well tuned to be at high idle. I believe this is to have the ol' girl stay running. I then had to ring a friend to grab me, as I was on the side of the road!! All this to say that, I rebuilt the SUs brought them back to spec and reinstalled( cleanest part in the engine bay ) got her running at high idle, but have a loud slapping noise coming from the front SU! was thinking that it might the mixture but no matter what I do it still there!! any suggestions
Last reply by Jeremy Mizerak, -
- 5 replies
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I have a 240Z with an L28 running a carbed L24 head. The car has been running fat for a long time now, but has gotten progressively worse in the last year. I know the carbs need to be cleaned or rebuilt (or replaced), and calibrated. However, I admittedly know next to nothing about working on carburetors. I worked in a shop for 6 years. Ive torn apart, rebuilt, and swapped fuel injected engines many times...Ive never played around with carbs. Is there a shop in the SoCal area that does good carb work? I know many of you say that tuning up the carbs is one of the easiest things to do on a Z, but between work and school I dont have a ton of time to dive into learning intric…
Last reply by Jeremy Mizerak, -
holley setup 1 2 3
by spdcrazy- 24 replies
- 6.9k views
new thread it is! i had a buddy come down and wrench on my Z a bit, and he knows holley's so he could give me some insight. guess i have the quick change vaccuum secondary's. so we popped the cap and found the diaphram torn in a few places. swapped that, and it ran soo much better. still a bit of stumbling, but we didn't check float levels or anything of that sort since we were at 3k above sea level, and the Z's new home is about 6k. need to sort out the new leaking brake master and my clutch leak as well. then the carb gets rebuilt and tuned. so far i am happy with it tho. its such a great feeling when the secondary's open up!
Last reply by racer88, -
- 2 replies
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I am converting a maxima EFI head to carb application. I wanted to fill the injector holes. I am thinking of using JB Weld like i had seen done by a bike racer who filled runners and reshaped to increase velocity. My only worry is the head expanding and the fill dropping out in the future. Any recommendations/suggestions/ experience? - to fill or not to fill that is just one question I figured that grinding some ruts in the hole area will help the JB weld grab.
Last reply by 240260280z, -
- 4 replies
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Hello everyone.. I have just ordered the K&N filters for my 1972 240z. My question is: What will I run into when installing these in place of my stock air box (any lines that need to be moved or additional filter I need to buy)? Any help would be appreciated.
Last reply by Bruce Palmer, -
- 15 replies
- 2.2k views
Hi, I was wondering what the best option would be? I currenntly have flattop carbs, but I was wondering if it really is worth getting them rebuilt by ztherapy. Otherwise the next cheapest solution is a new pair of weber dgv's, which I heard are not as good as su's, but I have only seen them compared to roundtops. I could get roundtops, but I have not been able to find the full setup, and then I would have to probably get those rebuilt. I have a 1973 240z with and L28, and I am on a very tight budget. Thank you for your help!
Last reply by yoshi_w, -
- 16 replies
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Check out this set-up currently on Ebay. Did any JDM S30's ever come equipped with this? http://cgi.ebay.com/ebaymotors/Datsun-L6-240Z-260Z-810-L24-L26-4-barrel-carb-manifold_W0QQcmdZViewItemQQcategoryZ36474QQitemZ8064000945QQrdZ1
Last reply by HS30-H, -
- 8 replies
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Possibly answered on the forum but I couldn't find it. My 1973 has ZTherapy carbs & a new choke cable assembly. I had my mechanic reposition the choke lever off of the plastic center console and onto the tranny tunnel. Prior to this work, when I moved the choke lever all the way back it would raise my idle speed (which I need when the car is cold - otherwise she wants to die); now moving the choke lever doesn't affect idle speed. My $1,000,000 question - SHOULD the choke lever also raise the idle speed (meaning that he didn't correctly adjust the choke cables)?
Last reply by 240260280z,
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Richard McDonel
