so close.. 2.0 weber 44s drives and misses Options

[gotxqss]

So did some searching.. Did some reading.. Have had this car for awhile and finally got off the ass to start tinkerin!

Cars a 75 with a 2.0 from another car.. Could be stock could be rebuilt I have no clue.. Guessing its a stock or mildly touched motor.. I had a buddy come over and get it idling pretty good.

Set float levels
Cleaned and put back together
Set linkage that sorta stuff

Just a quik list of the main parts as there might be a section that's just flatout needs attention .

Weber 44idf
32 venturi
175 air (I think these need to be higher?)
55 idles
F11 et
140 main

So anyway hopefully 1 of those things will standout to try to get me closer..

Haven't driven the car alll that much but from what I have. It will idle and rev well, the super low speed low rpm stuff feels decent but the midrange has stumbles. At a steady cruise it will pop as well. If I get in the gas pretty hard down low(under 2500rpm) it will be pretty dead till about 4k and then pulls really well to 6k.

So of course something is off but I don't have a weber guru here in vegas that I know of that can just handle it so now im asking for help..

Maybe there are some things that im missing to get me closer..

I do have 50 idles and 135 mains laying around..

Thanks guys.. Ill keep up and get this handled!!!!!!

[ME733]

Well YOU and everyone else is at somewhat of a disadvantage in giving some help because the "litely touched" engine may have more of a camshaft than you suppose...you could do a complete camcheck /duration/ lift/etc in the car...but it,s going to be tough and probably not very accurate....you can however check valve lift fairly easily..this will give YOU and some of us an IDEA/sort of a clue...of what the charistics the engine will have....think of the camshaft as the "computer/brain" that dictates air flow into and out of the engine.....having the CARBURATORS...set up..(jetted etc) to maximize overall performance...is even harder with a cammed up engine....and one end or the other of the RPM range is not , in all likehood , going to to be ideal....so with this said....lets venture a guess at your problem,s....1. the 44 webers will work just fine.2. the 32mm venturies will be ok.3.the 175 air corrections are good. 4. the 55 idle jets appear correct..("your buddy got it idling good")..5....the f-11 emulsion tube is TYPICAL for a street driven engine...6. the ..140 main jets...for a "stock range camshaft" are JUST TOO DAMN BIG......your clue is "it does not pull,and is flat , untill RPMs exceed 3000 "....THIS COULD be due to the camshaft/duration,etc.....or because IT,S TOO RICH at lower RPMs....7. install 115 main jets, without ANY OTHER CHANGES to your existing setup.(suggestion...never make more than one change at a time)..then test...8. the "popping " is probably an exhaust leak ....OR insuffent VALVE LASH when the engine is hot.most noticeable upon hard acceleration .9. it runs good above 3000 rpm,s up to 6000 rpm,s...did it pull strong over 5000 rpm,s?..if so this is another indication that the camshaft is not stock. and your bottom end rpm range will suffer(as in flat spots).probably.TRY USING the 115 main jet size ,get some plug readings and let us know the results. (IMG:style_emoticons/default/bye1.gif)