datsunlover Posted February 4, 2004 Share Posted February 4, 2004 Dono if this has been asked, but I did a search and only came up with two hits... ? Got to thinking maybe 3 mikuni's from a sled would work on my 280z? I don't know much about carbs.. and dont know how to figure out if a particular set of 3 carbs will be.. 'enough' to run my engine? I just want to try this for the sake of trying. I can build an intake easy enough at work, and have access to a pile of snowmobile parts (through a friend) but don't know exactly what I'd need for carbs. I've seen a few posts saying 'mikuni 40' and so on.. what is that? The carb size? model? Sorry if I sound like an idiot here.. but.. I kinda am! If this doesnt work for me, I can always put the FI back on and fix that system ($$$ ) but I'd like to try this triple carb thing.. I'm thinking I could throw something like this together cheap, and without the hasle of ordering expensive sensors, and chasing electrical problems! Any of you guys have some ideas for me? Quote Link to comment Share on other sites More sharing options...
randy 77zt Posted February 4, 2004 Share Posted February 4, 2004 i remember seeing a z with 6 mikuni bike carbs on it.if you paired the l28 cylinders together you would have a problem with firing order and air pulsing in carbs at same time1/6 2/5 3/4 should be paired as they fire 360 degrees apart.but this would make an intake manifold design problem.most people dont believe it but best carbs for a z are original 240 round tops.but dont let me discourage you.try it -you will learn something. Quote Link to comment Share on other sites More sharing options...
dmyntti Posted February 4, 2004 Share Posted February 4, 2004 I converted a motorcycle to larger aftermarket carbs once. The jets in the carb will likely be for a two stroke (oil gas mix) and will be too rich for the car. Also you will need to figure out a throttle linkage so all carbs work together and are synchronized. You can get the jets at any cycle shop and the linkage can be fabricated if your creative. just make sure that the carbs support enough airflow for the horsepower you intend to run. Quote Link to comment Share on other sites More sharing options...
datsunlover Posted February 4, 2004 Author Share Posted February 4, 2004 Ok.. well, if I'm runing a stock 2.8L engine (rated for 170 Horse), how do I figure out how much airflow I'll need? Ie; what size of carb(s) do I need to get? I really need to do some more research on carbs, because I have no idea about jetting/airflow/ect. And I was thinking about the firing order too.. My Idea for the intake would be a simpler version of the FI intake: 6 'tubes' coming out of the head (bolted to the head with a flat plate.. sort of like a header), going into a piece of square tube. Then the carbs would be bolted on to the other side of the square tube. (I have access to a Tig welder at work so it will be all alluminum) From looking at pics of the original twin carb manifolds, I figure this would work. And before someone says something about that, I was thinking of getting a used manifold (260z I thnk) off ebay but the guy wanted big bucks (like $800+) for the manifold and two carbs. For that, I could fix my FI! Anyway... any more thoughts ppl? Quote Link to comment Share on other sites More sharing options...
Tekira Posted February 8, 2004 Share Posted February 8, 2004 Buying a whole new carb a manifold can get expensive if you want good carbs. Not to mention the price of triple or multipul carbs, i just bought triple mikuni 40mm with manifold for $1000 from todd walrich at wolf creek racing. The 40 is the size of the carbs air tunnel. Usually 40, 44, and he rare 50. The l28 need more air as it has bigger displacement, but the main thing with getting approate air/fuel mix is proper jetting . Z therapy sells a whole su carb kit for about $600, and it comes with every thing you need. I myself dont like su's. They do run good but thats my opinion. Now If you want a set of some mean carbs contact todd walrich at Twalrich@wolfcreekracing.com He'll asnwer all you questions about all the different carbs for the z car. tell him you talked to josh watford, he'll have a laugh. anyway good luck with the car. try to post you car on cardomain.com Quote Link to comment Share on other sites More sharing options...
datsunlover Posted February 20, 2004 Author Share Posted February 20, 2004 Just wanted to drag this one back from the bottom of the forum... I talked to a buddy of mine who is really into snowmobiles. And he brought up a few interesting points. In a 2 stroke sled, the fuel requirements are about 2-3 times that of a 4 stroke because they fire twice as often, and ussually spin faster (between 6 and 10 000 RPM) With that in mind, I did some quick figuring in my head.. Take say... an 800cc 2 stroke that has twin 40mm carbs. Now if that engine was twice the size(1600cc), but a 4 stroke, those carbs would probly still supply enough fuel. Makes sence so far.. (I had an 85 Honduh CRX; 1.5L with a tiny carb... it worked well..) Then I figured, my 2.8 will never spin much past 6000RPM, so these carbs from an 800cc twin sled might be workable! What do you guys think? Am I just talking out my a$$ here? Feel free to just tell me to shut the hell up! Quote Link to comment Share on other sites More sharing options...
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