Guest TegRacer324 Posted July 6, 2006 Share Posted July 6, 2006 I have a 73 240z with the carbs a little screwed up so I was thinking about rebuilding them. The kit from VB is 20 dollars/carb however MSA is charging 110 bucks for a rebuild kit for a 73. Anyone know what the difference in the two kits are to justify 70 dollars? Quote Link to comment Share on other sites More sharing options...
DCZ Posted July 6, 2006 Share Posted July 6, 2006 Which carbs do you have? If you have the original stock 73 (flat top) carbs, the rebuild kit will be very different. I'm guessing that is what the MSA kit is. The $20 VB kit probably is for the 70 - 72 (round top) carbs and contains some washers, a float bowl gasket and maybe a float bowl valve. Check out http://www.ztherapy.com. I would buy SU stuff from them before either of the other two just because they specialize in these carbs and can help you out better. Quote Link to comment Share on other sites More sharing options...
katman Posted July 6, 2006 Share Posted July 6, 2006 Most SU poblems are caused by worn throttle shafts - which most rebuild kits aren't going to address. I'd buy rebuilt carbs from Z Therapy. Better than new. Quote Link to comment Share on other sites More sharing options...
Silent Posted July 6, 2006 Share Posted July 6, 2006 Most SU poblems are caused by worn throttle shafts - which most rebuild kits aren't going to address. I'd buy rebuilt carbs from Z Therapy. Better than new. not true. Quote Link to comment Share on other sites More sharing options...
Guest TegRacer324 Posted July 6, 2006 Share Posted July 6, 2006 Alright I definately have round tops then. There's still more than one rebuild kit out there though. How should I know which one to buy? Sorry I don't know much on these. I'm actually planning on doing a V8 conversion, but in the mean time I figured I'd get the engine running that's in there. Seems to fire up alright with ether and fuel is getting all the way to the carbs, it just seems that it won't run off it's own fuel leading me to believe it's something to do with the carbs. Damn the Z therapy rebuilds aren't exactly cheap. Quote Link to comment Share on other sites More sharing options...
zeiss150 Posted July 6, 2006 Share Posted July 6, 2006 Hey racer, I don't understand your last post. Are you using "starter fluid" to start the car, and once its started then it dies? or ... can you start it and it runs then it dies. Either way it could be your fule filter. There are also internal filters on the SU's that get pluged up its a good idea to pull them out. If you are having problems with enough fuel reaching the carbs you could have a bad fuel pump or the gas tank can get a bunch of rust in it and that plugs up the fuel lines and filters and stuff. SU's are pretty simple carbs the $20 kit will probably be fine, but make sure the fuel line they include is actually fuel line. The kit I got came with silicon "fuel line" bad idea. if you have any questions let us know. Matt- Quote Link to comment Share on other sites More sharing options...
katman Posted July 6, 2006 Share Posted July 6, 2006 "not true." Ok, I'll bite. Quote Link to comment Share on other sites More sharing options...
Guest TegRacer324 Posted July 7, 2006 Share Posted July 7, 2006 It will start on starting fluid, but just dies. The fuel is definately getting to the carbs I'm just not sure where it's going after that. I'm going to have to pull the tops off this weekend and see if I can see anything is in there that's plugging it up. Where are the filters in the bowl or the actual body? Quote Link to comment Share on other sites More sharing options...
X64v Posted July 7, 2006 Share Posted July 7, 2006 There's a strainer in the banjo fitting where the fuel enters the float bowl, but there is no filter in the carb. Quote Link to comment Share on other sites More sharing options...
Silent Posted July 7, 2006 Share Posted July 7, 2006 "not true." Ok' date=' I'll bite.[/quote'] leaking shafts can actually be a good thing. especially in my case. 3.1 liter. i can't get the motor lean enough without the shafts leaking just a touch. why? the motor pulls so much air it sucks more fuel then it really needs on su's hence the leaking shafts being a good thing to let some more air in to lean it out a bit. Quote Link to comment Share on other sites More sharing options...
katman Posted July 8, 2006 Share Posted July 8, 2006 "the motor pulls so much air it sucks more fuel then it really needs on su's hence the leaking shafts being a good thing to let some more air in to lean it out a bit" Riiiight. Quote Link to comment Share on other sites More sharing options...
zeiss150 Posted July 8, 2006 Share Posted July 8, 2006 Hey Racer, just to be clear, I said "filter" and x64v said, "strainer" ... Its the same thing, and He's right, its on the banjo fitting. Thats the metal part that the fuel hose clamps on to. How do you know that fuel is getting to carbs? If you Pull the fuel line off at the float bowl (i.e. the banjo fitting) turn over the engine and if fuel pumping ... then you have gas. but you still need to make sure that the fuel is getting "into the carb" Make sure the float bowl is filling up and you don't have a stuck float needle. Also, check the fuel line from the float bowl to the "nozzel" I've had that plug up and then, no fuel to the carbs. Also take off the air filter and make sure that the "pistons" move up and down freely. to test it just push up on the "Piston" with your finger and let it fall down, It should make a "Clunk" sound once it hits bottom. If the piston moves freely then fuel should flow when the engine is on. Check this stuff before you do the "rebuild" then you will know what "needs" to be rebuilt and what is working just fine. Let us know if you have any more questions :brunout: Quote Link to comment Share on other sites More sharing options...
X64v Posted July 8, 2006 Share Posted July 8, 2006 Ah, didn't see your original post, just saw TegRacer's reply. Quote Link to comment Share on other sites More sharing options...
Guest TegRacer324 Posted July 10, 2006 Share Posted July 10, 2006 It turns out it was a stuck valve on one of the bowls. Took it apart and it suddenly started working with a little carb cleaner and blowing into it. Then some idiot hooked the vent lines for the bowls up to the vacuum line for the distributor advance. I have no idea why. I don't know why I didn't catch it before. I was about to just start hitting the engine with a hammer until in desperation I pulled them off and it fired up. Thing runs like a damn champ. I'm really suprised for it sitting so long. It's really just too bad I'm gonna rip it outta there if I go through on this car. Thanks for all the help guys. Quote Link to comment Share on other sites More sharing options...
zeiss150 Posted July 10, 2006 Share Posted July 10, 2006 Supprised your L28 runs like a champ, after sitting for all that time? Welcome to the world of the AWESOME L28 engine. First it will drive you crazy cause it won't work right, then once you fix it ... you fall in love all over again. If your Z is running like a champ I wouldn't worry about the carb rebuild. Have fun and welcome to the Z world. Quote Link to comment Share on other sites More sharing options...
The Revelation Posted July 13, 2006 Share Posted July 13, 2006 hey, the rebuild kits are good and everything but the ztherepy ones are really nice, if you want basically new su carbs you can send in your carbs that you have now, and you will get them polished and a complete rebuild also. its always an option and if you are skeptical you can buy their movie that they have cause if you are rebuilding then it REALLY helps you out cause it goes step by step through the rebuild process and even goes into the throttle connection. Quote Link to comment Share on other sites More sharing options...
The Revelation Posted July 14, 2006 Share Posted July 14, 2006 just in case you are wondering how much it costs for a complete rebuild from ztherepy (if you send time in) its around $600 and its worth every cent. im very happy with mine, just get them back, put them one, and balance them. Quote Link to comment Share on other sites More sharing options...
ezzzzzzz Posted July 14, 2006 Share Posted July 14, 2006 I was having a fit with my triple Dellortos so I pulled them and ordered the Ztherapy carbs with euro balance tube. The Dells are going to Italy for a proper overhaul (throttle plates adjusted, etc.) and setup so I can drop them back in and go if I choose to. I love the look and sound of triples but for the typical street car those SU's are hard to beat. I have every reason to believe the Ztherapy carbs will be excellent performers based on nothing but positive posts from other users. Quote Link to comment Share on other sites More sharing options...
Silent Posted July 16, 2006 Share Posted July 16, 2006 "the motor pulls so much air it sucks more fuel then it really needs on su's hence the leaking shafts being a good thing to let some more air in to lean it out a bit" Riiiight. ::shakes head:: nevermind, this is like pissing into the wind build a 3.1 use stock su's then we'll talk. from the racers that have run them for years, still run them, rebello, hurst, and other z tuners across the nation have more hands on experience and have helped me then some yahoo with a website Quote Link to comment Share on other sites More sharing options...
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