Carburetor Central
If you have questions about the SU Carburetors, this is where you can find the answers.
Subforums
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Almost 2 weeks ago drove my car home from the shop with the new engine. Fuel pressure was a little low, about 3.8 psi instead of usual 3.9. Mix was way rich so leaned it out a quarter turn. Next day went for groceries. It was running OK. Saw the fuel pressure gauge reading wobble, then drop to zero. Drove a couple more blocks and ran out of gas. Next day ordered a Delphi MF039 mechanical F.P. on amazon. Review said it's original type, not stamped metal. Then I saw a cheaper one, a GMB 550-8040, on ebay from a local shipper. Bought it since it would get here sooner. I figured since it was so cheap I'd get another one so maybe I could use the parts to rebuild my Kyosan Denk…
Last reply by Stanley, -
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Has anybody found an equivalent match to the n27 needle in an SU needle? The n27 needle does not show up in in the SU reference charts. There must be someone who has plotted the 12 or so zones of this needle in the 45 years it has been around. Any help will be greatly appreciated. C Ps. I think I put this originally in the wrong area so I apologize for doubling up here.
Last reply by Mark Maras, -
- 5 followers
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I’m new to this forum and would appreciate any advice you can offer. I have a ‘72 240Z that is pretty much all original. I’ve owned it for about 2 years (my father-in-law was the original owner). I’ve noticed that if I don’t drive it at least every 1-2 weeks, the gas seems to evaporate from the carburetor. The only way I can start it is to put gas directly into the carburetor and the rubber lines leading to the carbs. This is more than just a hard to start carberated engine...there is no fuel in the carburetor or fuel lines and the fuel pump is not bringing gas to the engine when I’m trying to start it. If I drive it once a week, the Z starts up pretty easily. An…
Last reply by jmarwill, -
- 1 follower
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The Spruell Motorsport shipment just arrived with the stronger Weber 40 DCOE Throttle Springs. These springs are used to firmly close the throttle plates shut. This ensures consistent performance as explored and discovered in this thread: http://www.classiczcars.com/forums/carburetors-s30/48969-weber-internal-spring.html For reference, here are the Weber part numbers: 47605.012 Weaker 47605.027 Standard 47605.009 Stronger I decided to measure the spring constants of the springs I had on hand for reference: ?????????? (is from Pierce Manifold sold as 47605.009 BEWARE) New 713.2 N-m 526 Ft-Lbs 47605.027 Used 1,634.4 N-m 1,206 Ft-Lbs 47605.027 New 1,669.2 N-…
Last reply by Duffman, -
- 2 followers
- 8 replies
- 2.2k views
We've been doing some other stuff for the car so took my first test drive yesterday. New stage II engine. Carbs same as before, N-27 needles modified for richer mid-range and top end, and red SU springs (slightly stiffer than stock), as was required to get the 240 running right with Y70 head, 2 1/4 inch pipe and K&N's. Idle set at 1500 rpm in Park, drops to 700 in gear (to low for cam). AF ratio is abut 13.5 at 2000-2500 rpm which is per engine builder's spec, but drops to 11.5 (smoky) at idle. The engine's not broken in enough to try top end yet. I'm going to try FSM tune procedure today but doubt if adjusting the mix nuts will do the job. Worth a try before m…
Last reply by Stanley, -
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- 9 replies
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I am on the verge of installing a set of SK/OER triples, however I am not positive the ACCELERATOR TORSION SHAFT that was used with the SU's will be the correct length to interface with the SK's. Can someone using this type of carburettor chime in on this and point me in the right direction. I considered converting to a cable assembly, which could still happen down the road, but for now I would prefer to begin with the linkage. Any help would be appreciated, THANX!
Last reply by esmit208, -
- 8 followers
- 24 replies
- 4.8k views
Hi! Im thinking of installing an airbox or an heat shield (haven't decided yet) on my Triple carb setup and wanted to see your solutions and what (if any) difference it made. //Andreas
Last reply by gnosez, -
- 1 follower
- 9 replies
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For those of you that are still using flat top carbs (you know, the "boat anchors" that are so reviled by the jealous masses...:-) I have just found and bought on eBay a Datsun "National Service Document" that cover Carburetor Adjustment Procedures for the 260Z carbs. It appears that it will be useful for the '73 flat tops (like mine) also. It is a 23 page, well illustrated and detailed manual. I've scanned it into a pdf (774 Kb) file and if you have flat tops and want this, just PM me with your email address and I'll sent it to you. (Owners of inferior round top carbs need not apply...) Is there a site where documents like this can be placed for free download to th…
Last reply by mibh, -
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I decided I liked the look of the big itg air cleaner over the little Ramflo's I was running. I never liked the look of the air filter thing on the valve cover so I decided I'd run it kind of like on the stock air cleaner. I also did the carburetor vent lines into the air cleaner. Here's some pics of my new air cleaner and new plumbing for the valve cover and carb vents. The valve cover will be redone black with the ridges and Nissan OHC polished or maybe red to match the car.
Last reply by Patcon, -
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I am familiar with ZTherapy (Oregon) and Paltech (Ohio) services although have not used either personally. However, I am curious to know if there are any local, trustworthy shops in FL that are able to rebuild the SU Carbs for a '71 240Z. I've also come across these - https://www.ebay.com/itm/DATSUN-240Z...19.m1438.l2649 Basically my concern is the turn around time. I thought about rebuilding it myself and found a great write up but it might take me just as long with the current 2-3 month wait time. Too many projects on the honey-do list for the new year... Thoughts and feedback on vendors above also appreciated. Happy New Year everyone! For those looking for …
Last reply by Patcon, -
A/F ratio for L28 1 2 3
by Stanley- 2 followers
- 26 replies
- 6.4k views
Try for 14.9 or is it dumb to be attached to particular number? Engine is new, mild cam etc.
Last reply by siteunseen, -
- 2 followers
- 8 replies
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I'm restoring (assembling) a 1971 240. Too many parts from too many cars can cause confusion. I have one choke cable assembly, and pulled tight, the cables barely reach the choke levers, in fact full open choke is not achievable. I notice in various catalogues that there is a different part number from 1970/71 vs. 1972. Is the difference between the two cable lengths? Or does the difference lie in the mounting position of the lever on the console? Thanks
Last reply by Richard McDonel,
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