K
need help with weber
wantmolo
+1y
hey russ-d i could use your help right about now im finally getting around to getting my weber installed im actually in the process of rebuilding it my ? is what jet settings am i gonna need for my carb or if anyone else knos just post up thanks in advance guys
dssur
+1y
main jets 135-140, idle 40-60 depending on your altitude (less jet for higher alt)
the rest should be ok for just about any 4 cylinder, factory setup will be fine.
the rest should be ok for just about any 4 cylinder, factory setup will be fine.
wantmolo
+1y
hey russ i finally got the carb installed and all but am still having problems with it smoking its not really bad but also is it okay to plug the the tubes coming up from the exhaust manifold and another thing when i get the rpms up high it kinda sputtersi thaout that it might be the floats not letting in enuff fuel so i adjusted it a lil and it helped some but still does it a lil
dssur
+1y
yes plug those tubes. Thats the air injection to the exhaust manifold and without the valve on the factory air cleaner you are just pumping exhaust out.
Most likely that is why you are leaning out at high rpm, the big ass exhaust leak you have going on haha.
Try plugging the tubes, if it continues to sputter make sure the carb base is not overtight (or undertight for that matter), a vacuum leak there is very very easy and will sputter at higher rpm. If no vacuum leaks, (check all the plugs you put on the manifold, you did plug them right?) you may need the next main jet size up. DO NOT CHANGE JETS til you are sure the vacuum/ exhaust leaks are fixed.
Smoking how? Blue/oil? Black/rich?
Most likely that is why you are leaning out at high rpm, the big ass exhaust leak you have going on haha.
Try plugging the tubes, if it continues to sputter make sure the carb base is not overtight (or undertight for that matter), a vacuum leak there is very very easy and will sputter at higher rpm. If no vacuum leaks, (check all the plugs you put on the manifold, you did plug them right?) you may need the next main jet size up. DO NOT CHANGE JETS til you are sure the vacuum/ exhaust leaks are fixed.
Smoking how? Blue/oil? Black/rich?
dssur
+1y
oh, and here is a tip I have found on mixture screws.
Tighten it all the way in, then back it out two and a half turns. START THERE. Start the truck and adjust the idle screw to about 800-1000 rpm. Disconnect the vacuum advance and plug the line. Put a vacuum hose on one of the manifold vacuum lines you had plugged, a good sized one. Hold your thumb over the end of the vacuum line. With the engine idling steadily, move your thumb slightly off the line, giving it just the tiniest vaccum leak. If the engine speeds up, you were rich, turn the mixture screw in. If the engine slows down, you were lean, turn the mixture screw out.
I had a mechanically fuel injected BMW 2002tii once, and thats how I set the mixture on it, worked every time. Tried it when I got the next 2002 and put on a 32/36 dgv, worked brilliantly. You can use an exhaust gas analyzer or try and set it using an AFM hooked to an O2 sensor, but my way uses no extra parts.
Two tips: 1. If the engine speeds up as a result of turning the mix screw, adjust it down with the idle screw before continuing. (And vice versa, if the engine slows down speed it back up). 2. MAKE SURE YOU HAVE NOOOOO VACUUM LEAKS BEFORE BEGINNING THIS PROCEDURE.
Tighten it all the way in, then back it out two and a half turns. START THERE. Start the truck and adjust the idle screw to about 800-1000 rpm. Disconnect the vacuum advance and plug the line. Put a vacuum hose on one of the manifold vacuum lines you had plugged, a good sized one. Hold your thumb over the end of the vacuum line. With the engine idling steadily, move your thumb slightly off the line, giving it just the tiniest vaccum leak. If the engine speeds up, you were rich, turn the mixture screw in. If the engine slows down, you were lean, turn the mixture screw out.
I had a mechanically fuel injected BMW 2002tii once, and thats how I set the mixture on it, worked every time. Tried it when I got the next 2002 and put on a 32/36 dgv, worked brilliantly. You can use an exhaust gas analyzer or try and set it using an AFM hooked to an O2 sensor, but my way uses no extra parts.
Two tips: 1. If the engine speeds up as a result of turning the mix screw, adjust it down with the idle screw before continuing. (And vice versa, if the engine slows down speed it back up). 2. MAKE SURE YOU HAVE NOOOOO VACUUM LEAKS BEFORE BEGINNING THIS PROCEDURE.
wantmolo
+1y
thanks alot russ the smoke is black mixture srews? thos are the screws that are located on the upper driver and passenger side of the carb right