30% with stack injection

[alkyal]

Building a BBC approx 500 cu-in. Alum heads 360 int. runners and a Hilborn 3 in 3pc manifold inside nozzles. Have a 7 amp big cap Mallory that you did. With 30% as a starting point and probably not exceeding 50% due to components in short block. 2 questions: 1 what size pump do I need so as to NOT have to change when upping the percentage [ie Hilb/Waterman/Enderle]and what nozzle would be a good size to start @ 30/35%  2 What C/R do you suggest ? I dont intend to run pure methanol. I dont have pistons yet. Thanks Al

[Spud Miller]

 You could run up to 50-60% using a -1 Hilborn or Enderle pump. Of course, nozzles and pill size change as you increase, but it would work just fine for your needs up to 60% or so.

 I'd start with .038" or .040" nozzles at 30-35%. Be sure they are flow matched! You'll want nozzles that flow approximately .400 GPM @ 100 PSI @ .792.

 I'd suggest around 11.5:1 or so for a compression ratio.

 Have fun!
 Spud

[alkyal]

Thanks for your quick and informative reply on my question. Will search out the suggested components. Engine will be used in a FED that has history here in Clev. Ohio @ Draqgway 42.Hope to have the car finished for the Grand RE-Opening   Al