Well my engine is back together after spinning a rod bearing last year in the semi's at the local strip.This year I added a D.S.S. main suport and windage tray,and installed the cam at 0'' instead of 2deg advance.last year the best I could get was a 13.67 @ 99mph with a 2.10 60'.First time out this year it went 13.41 @ 99 with a 1.84 60'. then a 13.51 with air cleaner off (car may be lean) Element back on it went 13.37 @ 99 followed by a 13.36 @ 100mph.The car has potintial, Im taking off the Vic Jr and putting an air gap intake on today along with a metering block kit for on the 750 vac 2nd then I can start tuning the A/F.I hope those changed will put it in the 12s.Thought Id post this and let you all know of the results when I head back to the track on Sat.
wow sounds like the set up i use to have... just high gear and less tire and carb. but yeah i'd dump that manifold and go with the air gap for sure! i say if you aint buzzing over 7k theres no need for it. my friend did the same switch the car ran faster with the air gap. the only time the victor ran good was when he went to a huge ass cam and ported the heck out of the heads. i think you can get some good runs out of it. ever try messing with a small carb? anyways good luck!
Just a few observations and questions. 1. Too much carburetor. A 600 or 650 double pumper would help. A lot. 2. I've seen that camshaft before. Does it have 114 lobe separation? 3. How much timing are you running? Advance curve? 4. Where are you shifting? 5 Where does the stall speed go to on the foot brake? Car runs ok but with all that equipment in your signature I'd have to say it should be faster. I'm not criticizing the combo or you at all.......just wondering.
Sounds pretty good to me, now this is just me, but before I pulled the Vic jr. I'd see if I could borrow someones spare Holley DP with mech secondaries in the 650 to 750 range. May be that the vac. secondaries can't respond qwik enough for the Victor. That was my problem with the vacuum secs.
vac secondaries are ALWAYS lean on the secondary side...with foot WOT back off some pon the pedal and you'll feel the car pull harder..DP is the way to go
thanks for the input from everyone.I ran the car yesterday acording to my freinds weather station it was the same air as last sat when I ran the vic jr. and the stock 750 vac 2nd.The car ran allmost identical as last week 13.350 last week it went 13.364 the carb had a quik blipp in it out of the whole wich may have efected times a little the 60fts are down from a 1.856 to 184.0 with the blipp.I was only able to get 1 run in and then it rained.I was in the middle of changing the squirter on the car went from a 31 to a 37 hoping to get the blipp out but never had another run to see what would happen.As far as the carb. being to large Id rather not open that can of worms.The plugs are near perfect porceline off white and the electrode is blueing at the bend with no residue when wipeing the electrode on your hand.I'll go back again soon and let you all know what happens I just have to do a little carb tuning.As far as the camshaft the cam spec card says its a 116 center (good turbo cam) but when degreed it was 109 advancing it to 106 caused the valves to come way to close to the pistons.so its at 109 center.Well Ive babbled enough, have to run.
That "qwik blip" your talkin about is costing ya a 1/10 th of a second on your holeshot. When you think about what has to happen to open the vacuum secondaries up you realize why there not made for racing. I had the exact same scenario and I wanted to be hardheaded about it because I had just bought the carb before building the new engine and thought it would work. Before I took it to the track for the first time I told the guy that did my build I had some different springs and jets and I'd play with it till I got it right. He just smiled and went and pulled an old Holley 750 DP off the shelf and said here, when your tired of playing with it try this, well I got tired of playing with it and even more tired of that qwik blip that night so I put the DP on. My 60 ft went from 1.86 to 1.75 just that qwik. Another observation, if your reading the plugs after idling back to the pits your definitely running lean, imagine what's happening at WOT.
My carb'd buddies all shut the car off immeditately and throw the shifter in N just after that cross the line, coast to the turn around and then remove #1 plug. Install a different one then go back to the pits to study the plug. They tell me that all info is lost if you idle it back to the pits. just an f.y.i. and what I heard.
Air was really bad this past sunday 87deg and Air Density Alt. of 3300ft. last week it was 76deg and 2300 ft. After looking at the plugs.I decided to jet it up in the front so I went from 72s to 76s and droped a tenth.A little more tunning and some good air should put me in the 12s.
Keep your 750 carb....it'll work just fine. Everyone says it's too big, but it can be made to work...and work quite well if you're good with carb tuning. Keep in mind that you can get away with more carb on a dual-plane manifold as opposed to a single plane (especially the Victor Jr...which likes to be buzzed up there!) Heck, my other car runs a modified 850 on a 306, and it does real good, except for the lack of low end (victor jr manifold). I used to have basically the same engine in my Maverick years ago with an RPM manifold and just changing to a Vic Jr (and re-jetting) cost me .3...all of it before the 1/8 mile. Back to the RPM and it picked up that .3, plus it was MUCH more consistent...with the same 850 double pumper that is "way too big for a 302"
