Well let me start off with some background. I have a 72 grabber had it for a few years now and here lately I have had problems with starting her. She takes about 25/30 pumps of the gas pedal to start. I have a eld 600 that I just rebulit and has made no change (yes the choke works). I am running an in line fule pump regulated at 5 psi. I have some motor work done such as a huge cam, tall intake, hooker headers, high volt coil with a 3 wire eletronic dizzy, and cut away pistons. My compression is 155 on all 8 and the plugs are gapped at 40.. I know pumping the gas that many times isnt mormal.. also I have very little power untill she heats up. any places to look or suggestions will help thanks guys!
raise your fuel presure to 7 or 8 psi and get a bigger carb. a 600 is good for a stock or mild engine but a little lite for a "huge cam" i would also be nice to know what "huge" means. After you get it started check the timing. a bigger cam hotter spark etc etc will require an advance. With out knowing the exact specs of your motor i would guess your probably around 10 to 12 degrees when you probably need to be 14 to 16 maybe even 20 but i doubt that, also even cold that motor should never have very little power so i bet your timing is off, could be the dizzy i am guessing you get rid of the ignition module? Thats just a guess but 5psi is a little low even for stock i usualy run 6 or 7 and with that carb 6 or 7 should be fine but i bet your real problem is timing.
Yep basics like timing first. Also if you have a HUGE cam which likely means lots of overlap,TALL intake man. so I assume its a single plane. Not a good combination for cold starts. You have fuel running down the cold intake runners with no atomization coupled with lousy engine vacuum. Takes a lot of fuel to get an engine like that to fire cold. Add in bad timing etc. and you have a real problem. My first Mav was an aggressive build and it took about 8 full squirts of fuel from the 650 DP to get it to fire cold. Didnt run worth crap till 165 degrees. Nature of the beast. Check to make sure you are getting a good squirt from the accel. pump. You may have the pump arm adjustment wrong.
The timing has been set to 19. has for the huge cam, I'm not sure. its somewhere arround 400-450? the cam came out of a racecar and the numbers were ground off. We put the beast in and made sure it wouldnt knock the valves to slivers and off to the races I went. it could be the dizzy it's a ..........chevy...... with the bottom shaft cut off and a ford one put on. SO I guss I'll check my fule pis
