Injector line question
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Registered User
Joined: Jan 2015
Posts: 410
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From: Rogers TX
Injector line question
Been doing some forum digging while i had some downtime. I've been seeing things about non ic motors having bigger injector lines than intercooled motors. I'm not sure if (at all) how much bigger said lines are. My question is, I'm running a non intercooled pump which I've heard uses bigger delivery valves 
i didn't know this when i put the pump on. Is it taking our adding anything performance wise not having the non ic lines
i didn't know this when i put the pump on. Is it taking our adding anything performance wise not having the non ic lines
1st Generation Admin
Joined: Jan 2005
Posts: 4,601
Likes: 118
From: Buies Creek, NC
To the best of my knowledge, there are no differences in the high pressure lines between the NON ICed and ICed engine.
- Injectors: the NON ICed: are larger at 4x.013" (.000531" total cross sectional area). The ICed are 6x.009" (.000380" total cross sectional area).
- Delivery-valve holders: The NON ICed holders are physically longer. The difference between the two delivery valves are in the spring that works them. The actual valves are the same. It's been shown that the NON ICed DVs flow a very small amount more in the VERY low engine RPMs. The problem many might have with that is getting the needed air into the engine with the fuel (can't effectively spool turbo).
Regardless, DO NOT get larger high-pressure lines. The MAX quantity of fuel the 12mm VE can push has never been restricted by the lines. The restriction is in the injectors (see "Total Cross Section Area" as noted above).
If you insist, know that:
- Diesel is compressible albeit perhaps minor. The larger volume afforded by the larger line allows just that much more volume to be compressed.
- The high-pressure lines balloon with each injection event. The larger lines will balloon just that much more.
Combine the two above and you get the potential for weird injection event alteration (timing, pop-pressure, peak pressure, etc).
You mileage may vary.
- Injectors: the NON ICed: are larger at 4x.013" (.000531" total cross sectional area). The ICed are 6x.009" (.000380" total cross sectional area).
- Delivery-valve holders: The NON ICed holders are physically longer. The difference between the two delivery valves are in the spring that works them. The actual valves are the same. It's been shown that the NON ICed DVs flow a very small amount more in the VERY low engine RPMs. The problem many might have with that is getting the needed air into the engine with the fuel (can't effectively spool turbo).
Regardless, DO NOT get larger high-pressure lines. The MAX quantity of fuel the 12mm VE can push has never been restricted by the lines. The restriction is in the injectors (see "Total Cross Section Area" as noted above).
If you insist, know that:
- Diesel is compressible albeit perhaps minor. The larger volume afforded by the larger line allows just that much more volume to be compressed.
- The high-pressure lines balloon with each injection event. The larger lines will balloon just that much more.
Combine the two above and you get the potential for weird injection event alteration (timing, pop-pressure, peak pressure, etc).
You mileage may vary.
Registered User
Joined: Mar 2010
Posts: 7,265
Likes: 1,346
From: Prince George, BC
Great info BC!!
What I took from Vaders post is that he was asking about the length of the lines? So your comment on Non-IC DV holders being longer ...Which is correct...would account for the difference in length.
Probably easier to install a Non-IC IP with longer DV's on an IC motor, then the other way around.
What I took from Vaders post is that he was asking about the length of the lines? So your comment on Non-IC DV holders being longer ...Which is correct...would account for the difference in length.
Probably easier to install a Non-IC IP with longer DV's on an IC motor, then the other way around.
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