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

Right on!! Rolling that air is a real +...... That's why the stock air cleaner housing works so well.

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?

Edited April 14, 201113 yr by racer88

anybody know if that mechanical pump up front is enough to feed both carbs? Took the old electric off ran a filter to the tank and may add another before the pump. At first I noticed both filters at the carbs were just getting trickles of fuel I vented the tank differently and now they seem to be filling. Also since she is getting fed I have 19 inches of steady vacuum at 775 rpm idle. All the lines are hose except the main underneath so no perculation in Arizona.

I'm really surprised that a lot of folks do not run the original air cleaner boxes. I know that they are not the most attractive things out there but they do have a clear cut function with the built in air horns.......I ran those snap on air filters when I first got my car and went to visit Roger at the Z Barn. He hooked me up with a great air cleaner box with all the hardware - gave it a refresh/paint job (great link on the site by the way) and it automaticlly added power the first time I ran the car..........proper air horn size makes a big difference!!

Desertmonkey - the mechanical pump is plenty to run both your carbs just so it is in proper working condition. There is a location on your passenger engine bay for your Nissan fuel filter holder to attach to. I have only ran 1 filter with no issue's but that will be based on the condition of your tank.

Edited May 24, 201113 yr by Travel'n Man