injection event theory

Whoops, messed that last one up. 20 degrees pump rotation would mean fuel injected over 40 degrees of crank rotation not 10!...
 
Smokem said:
I would be lead to believe the difference of the governor assembly between the 180hp and 215hp pumps could cause this. I don't see the upper helix coming into play @ idle.
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That's certainly a possibility! The pumps just sound different even going down the road, much more of that helicopter type sound then a smooth steady exhaust note. I wonder if a set of CDS springs or equivalent 5ks would calm it down? I'd guess not given the Scheid 5k kit also made the 215 pump have the helicopter sound unless there's something drastically different about the CDS springs.

Weston, I would sure like to see some diagrams and some what of an explanation of how the upper helix works and any other information about the plungers that would come along with it! As always man thanks for your help! :rockwoot:
 
So if a stock pump cam injection ramp is 70 degress and roughly 5 degrees is just slowing to a stop, and 18 degree's is used to get to a static timing of zero, that leaves 52 degrees of pump cam rotation to inject the fuel. Which would be 104 degrees of crank rotation. (seems like a lot of fuel injected late in the stroke)

And a quick rate cam is 20 degrees pump rotation or 40 degrees crank rotation!

When you set a pump to say 25 degrees of static timing, I assume that would be the start of the ignition of fuel and that it will continue in inject for the amount of crank rotation specified above? (or close to it, some other factors left out of the discussion for simplicity)
 
I would just like to add that just because the pop-off pressure is 265bar, doesn't mean that the pressure in the injector line doesn't get higher then that. I have no proof that it does or does not go higher, but my understanding is that it does go higher. Because if you think about it if the rate of fuel provided by the pump increases past what the certain size injector can supply at given pop-pressure of 265bar, then the pressure would increase.

Aaron
 
apwatson50 said:
I would just like to add that just because the pop-off pressure is 265bar, doesn't mean that the pressure in the injector line doesn't get higher then that. I have no proof that it does or does not go higher, but my understanding is that it does go higher. Because if you think about it if the rate of fuel provided by the pump increases past what the certain size injector can supply at given pop-pressure of 265bar, then the pressure would increase.

Aaron
Click to expand...

P7100 max pressure is aprox 1300Bar
 
soooo what should we do to keep good atomization with a 180p/full cut DV/ and 5x16 inj.????? i feel as if i dont see much of a difference with the full cuts just horendous smoke.

thanks alot

Joe
 
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