racer88

Cool I brought my project 260 in from texas 3 years ago and now drive it every day now that it has warmed up

I have a early 260 with the small 240 bumpers a 280 short block with a large valve e31 head with a pair of 70 round tops. It is way more fun to drive then any car should be. Woohooo I have the best of all 3

I finally fixed a very annoying rattle in the doors. The little chrome buttons at the top of the door that the door lock knob goes thru had broken thus allowing the knobs to rattle> I went to the local parts supply and picked up a couple of 3/8"s x 1/2 inch rubber grommets, the type that electrical wires would pass thru. They fit the opening and the knob perfect. They look great as well as being functional Bob

I really like the look and sound of the su's but was getting frustrated, next step is I have an extra set of this carb spacers that I am gonna add between the intake and carbs, see how it likes that?

WoHooooo There may be hope for my su's yet. After struggling in the fall with various problem with my 4 screw su's. I had to run them rich so as to get rid of a surging at constant throttle and miss at wot then the car smelled of exhaust at idle and low speeds. When it was missing at wot if I just backed off on the throttle a little it would pick up and rev to 7000 ( I have a fairly modified 2.8). I looked at converting to injection or holley 4bbl and had discussing this with some of you. When I got the car it had dvg's on it. I converted it to 4screws that I rebuilt with zero play in the shafts. For air breathers i took the small elements fron the dgv's built flat bases and lids thinking that would be ok. The other day I took the car for the 1st ride of the year, on the way back I pulled over and removed the breathers and the car ran better. Yesterday i picked up some k&n filters of the same outside dimensions but 4" thick instead of the 1.25" thick like the dgv's. I also machined up some 3/4 inch thick raidiused air horns. Put it all together set the mixture with this new setup and went for a ride. The engine revved so fast I almost could not shift fast enough to keep up. No Smell no miss goes like a rocket to 7000. My guess it was a combination of not enough filter element and the new raidusd air horns. IT GOES LIKE A ROCKET. Bob

Z train It runs good, idles great, pulls like an engine twice it's size. just looking to get rid of the rich smell at idle and deceleration. It is not leaks in the body bad seals or poor exhaust that are causing this. i have totally rebuilt the car, it is plain and simple rich at idle. When i attemp to lean it out it then starts to miss at wide open throttle or surge at constant throttle. I am just not sure how much time I want to spend on grinding needles, playing with oil in the dash pots. I have been considering the su injectors from patton machine, but want to explore all options before I decide what to do. I have read all the posts about the 90 degree turn under the carb as being a bad thing. Just curious about peoples opinion on the factory injection system. By looking at the stock intake is it not i reality just a log style intake with runners coming off it at 90 degrees to the intake port with in fact the front two cyl. at more than 90 degrees. Just wondering why the down draft 90 might be worse than the horizontal 90. thanks for taking the time to respond. bob

Ozconnection I have considerable experiance tuning holley carbs on v8's. What manifold do you consider the best for spirited driving on the street and the odd track day, the clifford or the arizona. my engine is an l28 with e31 head with large valves and ported with 9.5 compression stage II cam, header and hei ignition. My current set up is 4 screw round tops. When they are rich enough to run at speed they are to rich at idle. I am looking at different options such as 4bbl conversion or a su tbi conversion that Tony has told me about. The weather is getting nice around here so i gotta make a decision soon. Any advice would be great thx Bob

the supposed "all stars" just proved you can take the Billy out of the hill but you cannot take the hill out of the billy ( no insult intended to my friends in the southern states) bob

There is no way the clowns with the white car could do that much structure and fabrication to support that stupid body in the time allowed. If you watch the time frame when it went into the paint both they must have had super fast dry paint cus the paint job alone would have taken to long. We need someone like Chip Foose to do his rendition of a zedd. bob

I am not sure how much overlap the cam has but a performance cam with lots of overlap will have lower cranking compression, but probably not as low as 90psi. The other thing that can affect cranking compression is cam timing. Just some things to think about Bob

Thanks Guys for all the help on this matter. My understanding of the operation of SU's is growing every day. Now all I need is for the temperature to grow every day. It is -8c today here. I am looking to gear up an O2 sensor and some sort of way to record real time data. If anyone has any ideas as to what hardware and software that they have used that would be great. I am going to go back and start again with the initial adjustments of my SU's including fuel pressure, float level, oil in the dash pots ,needle heights etc. When the weather warms up I can then drive it and know what the a/f is doing. I will post with my findings Bob

Leonv. It may be an adjustment issue. I can assure you there is no vacuum leak either at the throttle bushings, intake manifold or lines. i have totally dissasembled the carbs right down to removing the throttle shafts measuring bushing to shaft clearance the nozzles operate smoothly. In short the carbs are in perfict shape. I have set the needles flush with the bottom of the suction piston. I wonder if I pulled the needles slightly out of the suction piston would that tend to lean it out a bit. Because I assumed it was a lean misfire at wide open throttle i have been trying to richen it up to clear up this miss.

This engine is a 2.8 bottom with a e31 cylinder head with large valves and a mild porting job. Middle of the road cam, light flywheel, header with 2 1/2 stainless exhaust. ZX dizzy converted to a gm hei. my only complaint is the rich smell at idle and low speeds and the missing and sputtering at wide open throttle

I will take some pic's and post them. can you get a larger jet or would it be different needles that I would need?

Hi everyone The engine is almost new it has about 1,200 miles on it. It smells like rich exhaust. I have tried leaning it out but then it misses at higher speed and surges at steady cruising. There is no fuel (black) smoke coming out of the back the inside of the tail pipes look fairly clean. I'm not sure what needles are in my 4 screw round tops as they have no markings. I have tried adjusted my fuel pressure, my float level and the mixture nut. I can change the amount of smell but not get it to go away completely. Maybe I am being to fussy but I do not remember my chevelles and mustangs smelling that bad. maybe the fuel smelled sweeter back then without all the crap they put in it nowadays. I think I am going to install an O2 sensor in the exhaust to find out excatly what is happening.