Dans building a 2276 big ol motor

[dansam]

Ok it was'nt the valves. It ((WAS)) the right carb. I took the thing off and opened her up (not much in there really!) Anyway there was a ton of flash and crap in the bowl. so I cleaned all that out, blew air through a bunch of ports and slapped her back together and put it on the car and viola runs on all 4's again! Now I was tuning it and the only way to have it run decent at wide open throttle (WOT) is to have a TON of timing on it otherwise it just falls on its face (cutting out and bucking unless you pump the gas). Mind you real smooth at idle and half throttle not bad but at WOT it starts breaking up, now if you give it TONS of timing it pulls like a freight train but has some detination. So do I need smaller WOT jets? or did I make a very hungry expensive beast that needs 110 octain (Im running 91 now)

At lunch Im going to back it down a degree of timing at a time till it stops detinating but Im afraid that it will then bog down again. we will see.

[vw1s]

What is your static compression ratio?
Where are you at on timing right now, how many degrees total?
It sounds like you need a bigger main jet.

[dansam]

Well I got it to run fine (smooth) . But its now just a few ticks faster than the old motor (very disappointing actually). If I advance it the power surges but so does the detonation, when I retard it to like 12 degrees static (idle) timing, it runs great but even though it makes lots of noise it really isnt that fast. Im thinking higher octain or the bigger jet like was mentioned above. Also used almost a tank of gas in 30 min of beating on it hopefully will not be that bad cruising around. Ill drive it to clio tonight so I aught to see the cruisability.

1st gear is not will just pop out if abused. works fine if just driven normally.

[clintonddk]

Here is one thing that I see a lot, Did you make sure that you are getting full throttle when the accelerator is pressed to the floor. I have seen this more then once. Have someone get in the car and press the throttle and then take off an air cleaner and look and see if the butterfly's are opened all the way. What are your jets sizes? I would strat with a 135 main and a 175 air on F11 tubes. How about your float level?

[dansam]

Gee guess I was only opening it up less than a quarter of the way!!! So tightened it and got it to three quarters and BOY what a difference! I may have to mess with the linkage some to get that last quarter. the P.O. welded up the linkage. I may have to grind some weld to get that last quarter. As of right now the angles are all wrong. Plus when I let out the clutch its like it presses on the gas at the same time. Probably the motor flexing and pulling the cable. Open to all suggestions. But thanks Clinton for stating the obvious as I didnt see it...

[vwbugg2275]

if u dont hi compression u dont need 110 sure it helps on performance but u can run premium fuel and thats just as good for on the road and also cheaper the motor should be at 30 degrees full advance 2000 rpm thats what jim sets them at u should be able to go to 33 or 34 degrees and that should be enough if u go more than that it will start popping and spitting been there with mine in the baja im running 12:1 comp and willl be going to 14:1 shortly

[dansam]

WOW 12:1 - 14:1 !!! I think Im at 9:1 but the timing seems to be an issue. I think before I do anything else I need to get the throttles to open all the way. Will see what I can do with the linkage. Put in some neg pull on the arms and now does not pull gas when I let out the clutch. So thats a start. I really think Ill need to remove the weld on the linkage to get WOT. Gotten pretty far today though happy with the progress. Yestery was running on two cylinders and today is starting to feel healthy...

[vwbugg2275]

if yor at 9:1 u can run mid grade and be good just play with the arms on the carbs they can be picky ive taken mine off a couple of times and had to readjust them at least one at the track to get them to quit pulling at different times if they are off on one side the motor will nose over towards the side that pulls harder(first)

[dansam]

Well Ive figured out how to get that extra pull. All I got to do is shorten the stop on the gas pedal !! Simple. Ill do it tonight. It actually is running pretty darn well right now Cant wait so see how it pulls with the full throttle travel. I feel its all finally coming together.
Again thanks to all.

[dansam]

Well, I kept playing with timing and I got it to the point where its driving pretty well. I got all the popping and nasties gone. Really the only complaint I have is at full throttle it seems to have a little less power than half throttle. I think its a jet thing as Ive tried timing all over the place and its pretty much the same. Ill have to meet up with some professionals at the next meeting or GTG and get some opine's

[MadMike]

You never did tell us the jet sizes sounds like you need a bigger Main: take the air filter off, unscrew the jet stack, main is the one on the bottom,read the little number on it and report back to us ;D ;D ;D

[dansam]

Ok now understand Im very slow, and dont have the manual to these things "yet" I assume the "jet stack" are the two big copper towers in the middle and I did notice little jets on the bottom of them when I tore it apart and cleaned it all up.... BUT there were no #'s on them....also which is the prmary and wheich is the secondary? I mean if Im looking at the carb is it the forward tower or the rear one??

[clintonddk]

There is a mail jet and a air correction jet. They are both in what is called a emulsion tube. The main jet is on the bottom and if you pull the part that has the threads on it off of the emulsion tube then you will see the air corrector. Some times guys will ream out the jet and then file off the number so they don't get confused on what the jet is. If this is what you have then you need a jet gage to see what size they are.

[dansam]

Ok.... Ummmm... What happened to primaries and secondaries?? So I get the whole jet screwed into the bottom thing (saw that) Which of the two emulsion tubes are the main jet and which is the correction jet??? (forward/rearward??) and which does what job. I ass-u-me that the main is the primary and that the air correction is the secondary.. If I was to just buy a few numbered jets to play with what #'s should I aquire?? I dont have access yet to a gage but I may be able to find one. If both emulsion tubes are removed are they interchangable in the carb (can they be put back backwards in the carb?) are they generally similar in size??

[MadMike]

Forget all you know about Holly prim&sec crap ;D the Weber is not really a 2brl carb but two singles each having it's own curcuit, jet stacks are like Clint descrieb and yes ther interchangeable just unscrew and them pull apart,Mains are on the bottom and should have a # on the side of them (I use a Magnifing Glass ) I have 175 mains I have the CB up dates in one of my sets so your jetting will be diff,I'll GUESS ;D Emultion tube should be F11,Airs 200, Mains 150-155