SU Carb Technical Articles
Various articles and how-to's.
59 topics in this forum
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I just picked up a set of SU Rams (mini velocity stacks) that I put under my K&N filters and so far I'm very pleased with the performance results. I also switched out my smogger M58 needles to N27's which I'm sure added to a lot of the gain. Shipping from the UK took about 2 weeks. http://www.ebay.com/itm/151414457890?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT
Last reply by Bruce Palmer, -
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I've read that air tool oil is the same as sewing machine oil and that sewing machine oil works well in the SU carbs. Going to try and adjust mine this weekend and am gathering up all the stuff I'll need. Has anybody tried using that stuff or should I just buy fork oil from a bike shop, I've got about 2 qts. of tool oil already and we only have 1 motorcycle shop in town and they are higher than a giraffes butt. SAE 20 http://www.grainger.com/Grainger/STANLEY-BOSTITCH-Air-Tool-Oil-3RCY9
Last reply by beermanpete, -
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source: http://www.mgexperience.net/archive/su_improvments/207908 "On HS2s and HS4s for racing we thru-bore them, meaning no bridge what so ever, on HS2 you will actually run out of room, meaning a hole in the bottom of the carb you have to epoxy up. However for street cars this would ruin driveabilty, but with race carb nothing but wide open throttle matters. On a street car I would not worry about bridge mods, if I made any mods to a stock carb for the street I would think about beveling the slide so the square leading and trailing edge is nicely radiused towards the opening front and rear. There are a good many books on SU carbs that was mentioned above, also conside…
Last reply by SeafireXV, -
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Here is an ingenious method from: http://datsunzgarage.com/engine/index.htm Remove the dome and main piston from each carb so you can look down the tip of both fuel nozzles. Screw each mixture nut exactly 10 turns down from fully up. Each full turn drops the nozzle tip 1 mm, so 10 turns puts the tip of the fuel nozzle 10 mm (1cm) down....which happens to be the 23mm float bowl level. Then look down the tip of each fuel nozzle and adjust each float to set the gas level at the fuel nozzle tip.
Last reply by oranngetang, -
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A plastic cap (screw cover) from ACE hardware's parts bin and sealant/goo/glue seal the outside bushing nicely. Installed A thin washer and an o-ring seal the inside bushing with negligible effect on the throttle return.
Last reply by ConchZ, -
- 21 replies
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Top view looking down piston bore (flat top is on right) Flat top: Bridge is wider (front to back). Jet sleeve is fixed and jet depth is set to correct height in factory (no choke up/down movement). Front and rear ramps are different geometry. Piston diameter is smaller Has 3 circuits Main (jet and needle like in a round top) Choke (see the small forward spraying nozzle upstream of main jet) Power Valve (off idle transient to WOT...see the hole on right side of ramp at back of bridge) Has air bypass around main jet for setting idle mixture. Has integrated fuel bowl below jet. Front view looking into throat (flat top is on right) Flat top: Bridg…
Last reply by Captain Obvious, -
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Upon request, I have measured the fuel capacities of a typical round top and flat top carb. Note that due to shortcuts I took to make the measurements easier, I'm not claiming accuracy to the cc here, but the results should be fairly accurate. Here's the round top: And here's the flat top: The bottom line is that they are close, but it appears that the flat tops have a greater capacity in the float chamber.
Last reply by Captain Obvious, -
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http://www.zparts.com/zptech/articles/mal_land/ml_sucarb2/SUcarb_111601b.htm Don't think this has been posted, but it's a nice summary. Covers many of Hammill's points in his "Powertuning" book FWIW
Last reply by 240260280z, -
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Below is a video showing how to match pistons so that they rise and fall at the same rate due to differences in mechanical tolerances where the piston is sealed by the suction chamber: (the process is simply to remove the piston and dome, tape the two holes on the bottom of the piston shut, then measure/compare the drop time of the pistons). This process only compares mechanical sealing. If your pistons don't fall at the same rate, don't worry, there are some solutions: I just experimented further and the oil well plungers AND the type of oil in the well AND the temperature affect these fall rates. In theory you should be able to match piston rates by using different …
Last reply by 240260280z, -
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Note: I compressed all files into a .zip archive (winzip.com). This way you can get the big parts list in its full glory and clarity. I had to do this as, unfortunately, this website limits image size and compresses images so the parts list picture below is not very useful. 240Z SU Exploded View and Parts List.zip
Last reply by 240260280z, -
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I found this article on the web, and figured I would post it on this forum to help out all the guys running su carbs. It helped me out a lot. http://www.sonic.net/~kyle/su.html
Last reply by sblake01,
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