Logical1 Posted February 24, 2011 Report Share Posted February 24, 2011 Check this out. On ebay. Says it is a Datsun L-series Lynx BUT made to run British SUs! Nifty. Though I read somewhere that the japanese SUs are better. Still neat! Posted Image Nice find! The connection between two sides looks a little small to be a balance tube, maybe that's the difference. Looks like a great intake to mod for a Carb'd turbo setup though :cool: I found my stacks on Ebay but the seller has since stopped listing them :( They were $50 shipped from the UK. Haven't found any other like them for sale! Quote Link to comment
fisch Posted February 24, 2011 Report Share Posted February 24, 2011 The Black knobs on top of your SU's is the "dash pot" it has a little brass 'weight' in it that when you stomp on your accelerator the oil in the 'dash pot' slows the piston from rising to quickly and forces your mixture to stay a little richer until you reach speed. I have the 'high performance SU turning guide' and people argue on what is the best oil & dome spring to use. For my crazy SU set-up I decided to go with a stiff dome spring and no oil so when I stomp on it, I get a slightly leaner mixture but bigger airflow. Unless your certified crazy such as myself I recommend keeping a little oil in the domes :) Hope that helps! THat makes it quite clear, THANKS! But what's with the 2 little breathers coming off your carbs? (Are they breathers, hose things with the blue things on them?) Quote Link to comment
jbirds510 Posted February 24, 2011 Report Share Posted February 24, 2011 Check this out. On ebay. Says it is a Datsun L-series Lynx BUT made to run British SUs! Nifty. Though I read somewhere that the japanese SUs are better. Still neat! Ebay Linky you can run HS6 hitachi carbs on here (Z SU's) just fine with a little finessing of the flange bolt holes. Oh and vintage Harley guys run the SU dry...The company that makes the monster SU for harley is called rivera. Quote Link to comment
Logical1 Posted February 24, 2011 Report Share Posted February 24, 2011 THat makes it quite clear, THANKS! But what's with the 2 little breathers coming off your carbs? (Are they breathers, hose things with the blue things on them?) Well the float bowls have a atmosphere breather line that normally connects to the air filter, alot of people just leave them open to them air if not connected to the air box. However I had some extra little air filters and from the ammount of dirt/crap/water I get up on my engine in the NW I though: 'why not put a filter on them' Debris in your float bowls can be very annoying! My only advice there is to use very free flowing filters otherwise you can build up a vacuum and starve your carbs for fuel. Quote Link to comment
fisch Posted February 24, 2011 Report Share Posted February 24, 2011 Well the float bowls have a atmosphere breather line that normally connects to the air filter, alot of people just leave them open to them air if not connected to the air box. However I had some extra little air filters and from the ammount of dirt/crap/water I get up on my engine in the NW I though: 'why not put a filter on them' Debris in your float bowls can be very annoying! My only advice there is to use very free flowing filters otherwise you can build up a vacuum and starve your carbs for fuel. I am getting quite an education in this thread. Thanks so much! Quote Link to comment
Nice140Y Posted February 24, 2011 Author Report Share Posted February 24, 2011 Awesome info here Logical1.... sounds very logical to me... I can't wait to get my SU's going.... I may be coming back to you for some advice.... Quote Link to comment
LenRobertson Posted February 25, 2011 Report Share Posted February 25, 2011 My SU question of the day: How much throttle shaft/body wear can you have, and still be able to run? I have a noticeable amount of play (on a set from P&S I've never used), but how much is too much? On the Other Forums when the subject in mentioned, it always is implied there is Zero Tolerance for wear, but how about by Real World/Ratsun standards? I've read worn shafts causes bad idle, but does this mean 1. Won't idle at all. 2. Idles, but really rich. 3. Will idle if you set the idle speed up to 1200 RPM or something fast. 4. Some horrible scenario I haven't thought of. I understand sending the bodies to Z Therapy is what should be done, but that costs a lot of money. Cheap Guy Len Quote Link to comment
jun Posted February 28, 2011 Report Share Posted February 28, 2011 Len, I bought my SU's untested off ebay for cheap. They were really dirty and looked to have been used up pretty good. I cleaned them up and bolted them on, and it runs good. I have some shaft wear, confirmed by spraying starter fluid into the shaft area (idle increases). I have my idle set at around 800-900 and it's been fine. It's not the perfect scenario but for my intents and purposes, they work just fine. Rebuilds are expensive, honestly I could probably use one, but I chose not to because of the costs. I say bolt them on and check the performance and function first. Quote Link to comment
lardlungs Posted March 1, 2011 Report Share Posted March 1, 2011 anybody know where to get parts for these carbs. opened my float bowl today to see why it was over flowing and the float was full of gas and sunk. I cant seem to be able to find any new ones on this web. I just drilled a small hole in it to drain the gas then soldered the hole shut and the existing hole filled with jb weld. it got me home from work but dont know how long it will hold Quote Link to comment
Skib Posted March 1, 2011 Report Share Posted March 1, 2011 anybody know where to get parts for these carbs. call Z Therepy. Steve has a whole room of SU stuff at the shop and hes located in Salem. Quote Link to comment
zerow Posted March 1, 2011 Report Share Posted March 1, 2011 anybody know where to get parts for these carbs. opened my float bowl today to see why it was over flowing and the float was full of gas and sunk. I cant seem to be able to find any new ones on this web. I just drilled a small hole in it to drain the gas then soldered the hole shut and the existing hole filled with jb weld. it got me home from work but dont know how long it will hold Go to my How To for the Air Cleaners...I have part numbers on the last post... http://community.ratsun.net/topic/5294-su-air-cleaners-for-a-ratsun-price/page__st__20 Quote Link to comment
lardlungs Posted March 1, 2011 Report Share Posted March 1, 2011 thanks. im on the hunt now Quote Link to comment
LenRobertson Posted March 1, 2011 Report Share Posted March 1, 2011 Len, I bought my SU's untested off ebay for cheap. They were really dirty and looked to have been used up pretty good. I cleaned them up and bolted them on, and it runs good. I have some shaft wear, confirmed by spraying starter fluid into the shaft area (idle increases). I have my idle set at around 800-900 and it's been fine. It's not the perfect scenario but for my intents and purposes, they work just fine. Rebuilds are expensive, honestly I could probably use one, but I chose not to because of the costs. I say bolt them on and check the performance and function first. jun - Thanks for the info. I know the "right" thing to do is have the bodies re-bushed, but doing it "wrong" first is the story of my life. I'm happy if things just run. Running good is a luxury. I got these carbs off a decent looking 720 L20b truck at P&S. It has occurred to me that bad carbs might be why it ended up junked. I guess the price of gaskets and some time would give me an idea if they are runable. If Z Therapy is still selling the SU DVD, I recommend it. It is pretty long, but you will learn a ton about SUs from it. More than any of the books, I think. Len Quote Link to comment
lardlungs Posted March 1, 2011 Report Share Posted March 1, 2011 jun - Thanks for the info. I know the "right" thing to do is have the bodies re-bushed, but doing it "wrong" first is the story of my life. I'm happy if things just run. Running good is a luxury. I got these carbs off a decent looking 720 L20b truck at P&S. It has occurred to me that bad carbs might be why it ended up junked. I guess the price of gaskets and some time would give me an idea if they are runable. If Z Therapy is still selling the SU DVD, I recommend it. It is pretty long, but you will learn a ton about SUs from it. More than any of the books, I think. Len there are some good videos on you tube by university motors that explain a bunch also Quote Link to comment
MikeRL411 Posted March 4, 2011 Report Share Posted March 4, 2011 jun - Thanks for the info. I know the "right" thing to do is have the bodies re-bushed, but doing it "wrong" first is the story of my life. I'm happy if things just run. Running good is a luxury. I got these carbs off a decent looking 720 L20b truck at P&S. It has occurred to me that bad carbs might be why it ended up junked. I guess the price of gaskets and some time would give me an idea if they are runable. If Z Therapy is still selling the SU DVD, I recommend it. It is pretty long, but you will learn a ton about SUs from it. More than any of the books, I think. Len Temporary "fix" if you don't get your engine compartment too dirty would be to apply Dow Corning DC4 silicone grease around the shaft to carb body junction. The DC4 will at least temporarily seal the leak, if that's what the problem really is. If no improvement, then you have problems beyond shaft to body wear. If it does work you might see if cutting shortening and resealing a silicone spark plug boot at the seal area would keep dirt off and prolong the agony of deciding to rebush. Good Luck! Quote Link to comment
510can Posted April 27, 2011 Report Share Posted April 27, 2011 Its's, not a L series but its still a SU set up :).. Quote Link to comment
Skib Posted April 27, 2011 Report Share Posted April 27, 2011 are you running a balance tube? Quote Link to comment
510can Posted April 27, 2011 Report Share Posted April 27, 2011 are you running a balance tube? Yes, yes I am :), if you look at the square piece in between over there, its a hollow square piece of metal, I chose square cause the throttle cable bracket was super easy to make :). As soon as I get the head back from the shop do to a bad HG, Il post some better pics of the finished product :). Quote Link to comment
frodo70444 Posted April 28, 2011 Report Share Posted April 28, 2011 when i rode dirtbike the older crown would always say certain people had been riding so long they had parts made out of wood funny for me to accualy see wood being used on a datsun Quote Link to comment
WAGON JON Posted August 13, 2011 Report Share Posted August 13, 2011 Yes, yes I am :), if you look at the square piece in between over there, its a hollow square piece of metal, I chose square cause the throttle cable bracket was super easy to make :). As soon as I get the head back from the shop do to a bad HG, Il post some better pics of the finished product :). So where are those better pictures? Hows the thing run??????? Quote Link to comment
Ant-dat Posted January 29, 2012 Report Share Posted January 29, 2012 here are the pics of the UK versions 180B SSS (810 1979) L18T this set i ran on my L20B for a while, i then changed back to single carb. bluebird SSS (910 1981) L18T the main carbs are the same, there is differnces in the inlet manifold though Quote Link to comment
ggzilla Posted January 29, 2012 Report Share Posted January 29, 2012 Those flat-top 38s are better than dome-tops. Anthony you still have the idle-mixture stuff connected, most guys here take the hoses off not knowing what it's for :unsure: then tell everybody they don't run correctly. Quote Link to comment
Ant-dat Posted January 29, 2012 Report Share Posted January 29, 2012 lol, that will do it. the 2 sets are complete i shold have all the parts some where, not sure we had any others carbs that one i posted Quote Link to comment
Dirttrack510 Posted March 2, 2012 Report Share Posted March 2, 2012 Anyone have a close up pic of how to do the linkage to make 46mm SU's work properly on the L16 SU intake? mine are binding up & turning the wrong direction. Quote Link to comment
banzai510(hainz) Posted March 2, 2012 Report Share Posted March 2, 2012 Dirttrack Z car SUs rotate the other way(what I have heard otherwise I never heard it was just a bolt on. 46 was to big on Datto510s L20b wagon. Thay stunk so he got some weber DCOE 40mm ran better and no stink Quote Link to comment
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