Captain Obvious Posted April 23, 2017 Share #13 Posted April 23, 2017 10 hours ago, SteveJ said: Could this be of any help? http://www.teglerizer.com/suneedledb/090needlesortjava2.htm That table is needles designed for the .090 nozzle. Anything in that list will be way too rich to run in the .100 nozzle. Maybe one could switch over to a .090 nozzle/needle pair and find something that might work? Link to comment https://www.classiczcars.com/topic/57548-n27-needle-equivalent/?page=2#findComment-518889 Share on other sites More sharing options...
SteveJ Posted April 23, 2017 Share #14 Posted April 23, 2017 Thank you. I have a lot of gaps in carburetor knowledge. I was impressed with the amount of information on needles on that page, though. Link to comment https://www.classiczcars.com/topic/57548-n27-needle-equivalent/?page=2#findComment-518891 Share on other sites More sharing options...
Captain Obvious Posted April 23, 2017 Share #15 Posted April 23, 2017 Agreed. They do have info on the .100 needles as well, but they didn't write the java to put it into table form like they did for the .090s http://www.teglerizer.com/suneedledb/ Somewhere around here I've got a spreadsheet with all of them... Link to comment https://www.classiczcars.com/topic/57548-n27-needle-equivalent/?page=2#findComment-518895 Share on other sites More sharing options...
zKars Posted April 23, 2017 Share #16 Posted April 23, 2017 (edited) and you wonder why fuel injection was created.... Time to create a variable orffice (iris?) thingy controlled by SU piston position and software..... Edited April 23, 2017 by zKars Link to comment https://www.classiczcars.com/topic/57548-n27-needle-equivalent/?page=2#findComment-518897 Share on other sites More sharing options...
Boomguy Posted April 23, 2017 Author Share #17 Posted April 23, 2017 I think I'll stick to the .100 jet combo. I have scoured all the tables on su needles looking for something comparable and honestly there isn't much. Hitachi really had their own ideas of slope for the needles when they came up with this. Link to comment https://www.classiczcars.com/topic/57548-n27-needle-equivalent/?page=2#findComment-518908 Share on other sites More sharing options...
240260280 Posted April 23, 2017 Share #18 Posted April 23, 2017 N47 Alternatives according to profiles: KI will give richer mid band: http://sucarb.co.uk/catalogsearch/result/?q=KI SM will give richer high rpm band SA and SH will give leaner mid-high band KH will give richer low-mid and leaner mid-high band SI will giver richer low-mid and richer mid band SP will give leaner mid and high band band Link to comment https://www.classiczcars.com/topic/57548-n27-needle-equivalent/?page=2#findComment-518930 Share on other sites More sharing options...
Johnny wick Posted February 8, 2018 Share #19 Posted February 8, 2018 (edited) I am using sm needles on my 3 screws su carbs with a modified 2.6 liter engine and schneider 274f and its impossible to have a smooth idle with them. I guess they are still too rich at idle. So rich plugs start to foul and engine tends to stall on traffic jams. Using atf as damper oil. Edited February 8, 2018 by jalexquijano Link to comment https://www.classiczcars.com/topic/57548-n27-needle-equivalent/?page=2#findComment-541843 Share on other sites More sharing options...
Mark Maras Posted February 8, 2018 Share #20 Posted February 8, 2018 @Chickenman In post #11 you mentioned dropping your E88 needles .020" to lean it out at idle and it worked great. Do you think this would work for Jalex's SM's? Seems like he's having the same problem you had. Link to comment https://www.classiczcars.com/topic/57548-n27-needle-equivalent/?page=2#findComment-541845 Share on other sites More sharing options...
Johnny wick Posted February 8, 2018 Share #21 Posted February 8, 2018 Come on guys give me the secret. Im getting there finally. It seems that the front carb requires half a turn more than the rear carb on the idle mixture knob Link to comment https://www.classiczcars.com/topic/57548-n27-needle-equivalent/?page=2#findComment-541846 Share on other sites More sharing options...
Mark Maras Posted February 9, 2018 Share #22 Posted February 9, 2018 That 1/2 turn is probably the difference in the float levels of the carbs unless the needles weren't installed properly. Link to comment https://www.classiczcars.com/topic/57548-n27-needle-equivalent/?page=2#findComment-541852 Share on other sites More sharing options...
Johnny wick Posted February 9, 2018 Share #23 Posted February 9, 2018 This is really strange that both carbs cannot be dialed equally as i paid ztherapy almost 700 usd to rebuilt both carbs on november 2014 Link to comment https://www.classiczcars.com/topic/57548-n27-needle-equivalent/?page=2#findComment-541857 Share on other sites More sharing options...
Johnny wick Posted February 9, 2018 Share #24 Posted February 9, 2018 Also noticed that the axis that holds the float is different on the front carb in comparison to the rear one Link to comment https://www.classiczcars.com/topic/57548-n27-needle-equivalent/?page=2#findComment-541858 Share on other sites More sharing options...
Yarb
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