Project Resurection P-Pump
#161
#163
A sac style nozzle alleviates a few issues that are common with the VCO nozzle. Needle steer being the main issue, and also a smaller failure rate since the pintle never contacts the spray orifices. The sac volume plays into the amount of power produced and also the amount of haze or smoke in correlation to the engine size. You can use a larger volume sac nozzle to make a bit more power, but haze will increase as will overall unburnt fuel. There is a balance to provide good hp characteristics yet retain streetability, in a maximum effort platform this would not be a concern.
Needle steer or low lift needle deviation basically is the pintle flexing during actuation, this leads to some orifices being uncovered earlier than the others. With wear this problem worsens, this uneven pattern early in the injection event was attempted to be corrected/reduced by using a secondary needle guide, found in the CR applications. However, due to the overall tolerance issues associated with the secondary guide, they 6.7L has gone back to a micro-blind nozzle to deal with the same issue, simplicity wins. These low lift areas in the injection event are much more subjective to the VCO nozzle due to the fact that the uneven flow is being controlled by the pintle seat covering the orifice, whereas in the sac nozzle the flow is being fed from the blind-hole.
... read more here
Injector Breakdown - Competition Diesel.Com - Bringing The BEST Together
---AutoMerged DoublePost---
weston posted the above info on the other thread ... Im not that smart
Needle steer or low lift needle deviation basically is the pintle flexing during actuation, this leads to some orifices being uncovered earlier than the others. With wear this problem worsens, this uneven pattern early in the injection event was attempted to be corrected/reduced by using a secondary needle guide, found in the CR applications. However, due to the overall tolerance issues associated with the secondary guide, they 6.7L has gone back to a micro-blind nozzle to deal with the same issue, simplicity wins. These low lift areas in the injection event are much more subjective to the VCO nozzle due to the fact that the uneven flow is being controlled by the pintle seat covering the orifice, whereas in the sac nozzle the flow is being fed from the blind-hole.
... read more here
Injector Breakdown - Competition Diesel.Com - Bringing The BEST Together
---AutoMerged DoublePost---
weston posted the above info on the other thread ... Im not that smart
Last edited by 94 12valve; 11-15-2010 at 09:52 PM. Reason: Automerged Doublepost
#165
#166
#168
#169
Well, I decided to do the factory gas tach since the AutoMeter 5" tach is 400+ bucks So I went out to the local auto recycler and got a cluster for 45 bucks
The steps that follow do not need to be performed, the clusters are a direct swap so pulls yours out plug the new one in done! But I took it to the next step since gas clusters that are none auto setups are impossible to find and I didnt want the gear selector in the dash... Heres the pics...
Seven screwes hold the plastic cover on
Thatll remove the cover but leave the bezel in place for the moment
Next flip it over and find these 3 screws and undo them
Flip it back over and pull the bezel out of the way. (holds the gauge inplace when u take the screws out when its upsidedown)
Pop that sucker out!
Now I'm not gonna put it in the truck yet since it says "unleaded fuel only" and that bugs the crap outa me so im gonna find a way to black it out best as possible!
OH! and that redline will be accurate one of these days, I wanna be coming off the line around 5k
The steps that follow do not need to be performed, the clusters are a direct swap so pulls yours out plug the new one in done! But I took it to the next step since gas clusters that are none auto setups are impossible to find and I didnt want the gear selector in the dash... Heres the pics...
Seven screwes hold the plastic cover on
Thatll remove the cover but leave the bezel in place for the moment
Next flip it over and find these 3 screws and undo them
Flip it back over and pull the bezel out of the way. (holds the gauge inplace when u take the screws out when its upsidedown)
Pop that sucker out!
Now I'm not gonna put it in the truck yet since it says "unleaded fuel only" and that bugs the crap outa me so im gonna find a way to black it out best as possible!
OH! and that redline will be accurate one of these days, I wanna be coming off the line around 5k
Last edited by Red_Rattler; 11-22-2010 at 03:56 PM.
#170
The following users liked this post:
Red_Rattler (11-22-2010)