Carburetor Central
If you have questions about the SU Carburetors, this is where you can find the answers.
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Not sure if this is right place but... someone told me to siphon out the old gas and replace.... Isnt there a drain plug on the OEM tanks? Is there a reason i should siphon instead of draining? We are talking about couple gallons at most
Last reply by siteunseen, -
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Hello wise ones. I have a friend who is about to install his triple OERs onto a brand new high-end engine for his first start up and initial run-in. But given what a critical time those first 20-30 mins are, there isn’t much latitude for messing about to get them dialled in. So, I have advised he starts with his good known SUs set a little richer (say 3 turns down) than previously to account for a more thirsty engine and then once initial run-in is complete, he can swap them out. Also easy to get the adjustment right quickly with his afr guage. However, what if? What if he threw on the OERs and kept them there from the very beginning? How do you set them up s…
Last reply by AK260, -
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I hardly ever drive my 240 but when the weather is so nice I can't stay inside, and "all work and no play makes Jack a dull boy". So I've driven it some but after sitting so long I think the mechanical pump must have dried up and cracked the diaphram or whatever makes it work. Anyhow it died on me yesterday. Lucky me has a good neighbor because he has such a good neighbor. I called him up and told him where and what to bring me so I could get the car off the side of the road. An old low pressure pump I've had for years to transfer gas from here to there and my tool bag. Oh yeah my best testing tool, about 15ft of speaker wire with alligator clips on both ends. Didn't…
Last reply by texasz, -
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Does anyone know the actual flow rate of the mechanical pump? I am tempted to support mine with an electric pump. - a facet silver top as it’s not too juicy on pressure for my SUs (with a regulator of course) but their literature says it’s good for up to 200bhp - mine makes anywhere from 230-245 depending on whose dyno it’s on! ;) But the difference between a silver top and a red top is only 10% more flow for the red top. Yet the red top is quoted as 200+ applications. But what does the “+” mean if it’s only 10% more flow? 10% more power or infinity!? ;) But foremost I’m interested to know the flow of the mech pump - can’t seem to find it in the FSM I have.
Last reply by Zed Head, -
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On of the items missing entirely when i got my car was the air filter housing and parts. I was able to buy the housing unit in image below but dont have any other items. I read another post that had the microfiche image and parts. do i really need all those. seems like a lot. Does anyone have an image of how the base itself connnects to the carbs? Any images, links or info would be appreciated. Have no idea where to get these parts......trying local nissan but its doesnt look good.
Last reply by SteveJ, -
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does anybody know why I have carb oil on the bottom of my 4 bolt su carbs? it seems when I put my finger under the mixing screw it get wet with oil. these were rebuild way back in 1997 from z therapy . so could there be a seal or gasket that went bad? thanks kully
Last reply by kully 560, -
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1. can someone help tell me where the line in image 1 goes 2. In image 2, what does this line go to and whats the thing with 3 connections? much thanks
Last reply by Terrapin Z, -
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Hello, I was chasing down (again) a problem with a stuck open nozzle when easing out the choke on my SU carbs when I noticed some weird play between the Connecting plate A and the attached 'unknown name plate' on the choke shaft. Both carb have it - more pronounced on the front one. Also the connection between the connecting rod and the fast idle lever (the connection with the small spring) looks very loose. I added three videos to show the current situation. Any help and feedback is appreciated. If someone is wondering about the throttle return spring custom setup => i had to circumvent some fitting issues with the heatshield and Zstory headers. Also the do…
Last reply by Johnny280, -
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Can anyone help me determine what these are called? I have flipped through my haynes manual and must be overlooking them. thanks
Last reply by siteunseen, -
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Does anyone have any of the original wing nut bolts that hold the air cleaner onto the SUs? I am in need of 4 of the wing nut bolts only, don't need the receiving nut that it goes into. Thanks! Duffman
Last reply by 70 Fairlady Z, -
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I pick up a holley fuel pressure regulator 12-804 and was wondering where to install it, is it better on the supply line or the return line for 4 bolt su carbs. I installed it originally on the supply line but have been reading it might be better on the return line as it might help in cooling the fuel , does it really matter ? thanks
Last reply by Jeff Berk, -
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I'm fairly new to carbs, been playing around with them but never did understand the intricate details on how they actually work. Found a neat youtube vid that explains how they work: https://www.youtube.com/watch?v=toVfvRhWbj8
Last reply by davewormald,
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