Was doing some reading lately about the difference between A codes, B codes and Hybrids; have some questions about fuel atomization and pressure ranges and how they effect mileage, power, ect.
From what I can gather from Bigr's sticky on the main 7.3 page:
1) A codes have a 6mm plunger and a 16mm intensifier piston and = 7:1 icp
2) B codes have a 7.1mm plunger and 17.5mm piston and = 6:1 icp
3) Hybrids have a 7.1 plunger and 16mm pistion and = 5:1 icp
So, there must be then an inherant drawback in lowering icp
ratio such as less optimal atomization,
but while loosing psi
you are gaining fuel flow at the same given High press oil flow. Is this on track?
Also, I was wondering what role nozzle size plays in the final fuel psi
in the cylinder during combustion?
(bigger nozzle will yeild less psi
at the tip and not as good attomization, but has a higher fuel flow bigger nozzles do tend to be more oil thirsty than smaller nozzles cause the fuel flows faster do to less resitance but the Intensifier piston moves faster due to less resistance and that is why it uses more oil)
Ok, If a person for instance was running Big Oil at say 3600psi of icp
with an A code injector you would see a 25,200psi at injection correct?
(In theory but I believe that that is not even close those numbers would be true if there were no hole in the nozzles)
And 21,600psi with a B code,
(Same as above)
and 18000psi with a hybrid
a hybrid probably has a higher injection pressure at the nozzle than either a b code or an a code)
at the same given amount of HPO capacity. So, obviously the hybrid would be flowing much more fuel than the A code but at a lower press. Does nozzle size change the final ratio and the amount of oil need to supply?
(oil yes but the ratio still stays the same)
If so, what are the real world differences in say towing for instance with a theoretical difference of 7,200psi of injector press between the A and the Hybrid?
Ok, another thought. If there are benifits to much higher injector psi
(I think the Dmax and Cummins common rails run like 25000psi+ dont they?) could a person build a "reverse hybrid" (for heavy towing) with a 6mm plunger and a 17.5mm piston and make 8:1 icp
ratio? If so, I'm sure you'd need big oil but, geeze; 3600psi of icp
@ 8:1 = 28800psi. Whats yer thoughts?
They dont work very well. Oil cont enter the injector fast enough to make that pressure.