quote:

Originally posted by Big Steve:
All depends on the pill/nozzle tune up and rpm range. I use a 0-200

Thank you for the info.

quote:

Originally posted by 183N:


Since you mentioned the surge tank setup is new, I’d investigate that and make sure it’s working properly before sending the pump in. Perhaps it’s starving the pump of fuel. Also make sure it can’t be sucking air anywhere on the inlet side of the pump such as from a leaky fitting. If the pump was fine when you put it on the shelf it’s unlikely that it’s all of a sudden 25psi low.

That is a very good point. 3 times I have found a small leak in system and all it took was to fix leak. Two of those times I had friends come to borrow one of my spare pumps. Both times they found the bottom fitting had come loose and it was sucking some air. Was not leaking alcohol but would suck some air when trying to pull fuel in. Tighten fitting back up and it ran number again.

I have ran one pump for about 8 years and it still puts out same pressure and volume as before. The Enderle pump is a gear drive similar to an oil pump and they just do not wear out that much.

As for Mechanical injection some say you have to run at least 150 PSI to atomize the fuel. I have ran it at 150 Plus and I have ran it under 40 PSI with no difference at all. Also many Dyno pulls and passes with Data Logger and O2 to monitor every cylinder. The motor uses X pounds of fuel per pound of air and it does not know or care what pressure it goes into motor.

quote:

I have ran one pump for about 8 years and it still puts out same pressure and volume as before. The Enderle pump is a gear drive similar to an oil pump and they just do not wear out that much.

Agreed. When I bought my car (07) it had a Rons 0 gear rotor pump. After reading what others had posted, in 2013 I sent it to Rons to be checked and needed the mounting plate replaced. The pump shop called me and this older sounding gentleman wanted to know what I ran with this pump as he said he never seen gears polished so smooth. He said it was an older pump from the mid to late 80’s and actually flows slightly more than a new pump now. I told him to look at the pump fittings, it’s plumbed backwards (in side feed the barrel valve). He said “yes but the pump don’t know it”.

I ran that 0 pump with my new EFI in 2021 for several months but switched to the same style Rons 0-1/2 to gain more pressure at idle running the system at 4 bar.

Well the pump is on the way to Ron's to get flow checked, they said worse case if it needs new gears and wear plate it would be $250 plus the ride. Money well spent, that pump owes me nothing

So I have a 461" SB2 in my dragster. 1820 lbs, best has been 4.71 @ 145, 7.54 @ 175 with a 1600 Twin blade on Q16, on non oxygenated a 2.250 throttle blade 4 barrel was about .04 slower. I have run up to a 2.800 on Q16, it was only .05 slow. The problem with methanol is it makes lots of torque, however a properly set up car with sufficient gear and converter runs the RPM's well past peak torque. SB2's carry HP well past peak HP with gas, and methanol does not. Mine runs best with the stall between 6600-6900 even though peak HP was at 7100. Current gear is 4.30. Trap RPM in the 1/4 is 7900 with 32" tall tires, taller tires slows the car down.

quote:

Originally posted by jmarkaudio: I have a 461" SB2 in my dragster. Mine runs best with the stall between 6600-6900 even though peak HP was at 7100. Current gear is 4.30. Trap RPM in the 1/4 is 7900

If max hp is achieved at 7100 rpm, how much hp is the engine producing at 7900 rpm? What rpm is used for 1/8 mile? Can you share the dyno printout?

quote:

Originally posted by jmarkaudio:
So I have a 461" SB2 in my dragster. 1820 lbs, best has been 4.71 @ 145, 7.54 @ 175 with a 1600 Twin blade on Q16, on non oxygenated a 2.250 throttle blade 4 barrel was about .04 slower. I have run up to a 2.800 on Q16, it was only .05 slow. The problem with methanol is it makes lots of torque, however a properly set up car with sufficient gear and converter runs the RPM's well past peak torque. SB2's carry HP well past peak HP with gas, and methanol does not. Mine runs best with the stall between 6600-6900 even though peak HP was at 7100. Current gear is 4.30. Trap RPM in the 1/4 is 7900 with 32" tall tires, taller tires slows the car down.

With mfi you can, just add in a high speed to bleed off a bit of fuel up top.....