Can custom tune hydra make AE give false #'s
Hotshot
Joined: Jul 2008
Posts: 12,782
Likes: 2,142
From: N.GA Mountains
The oil aeration test is to hold the engine at 3000 rpms in neutral for a few minutes (waaaaaaay longer than is ‘comfortable’ - lol. But, it’s not hurting anything....).
If you lose ICP and engine bogs down, you may have an aeration issue.
If you lose ICP and engine bogs down, you may have an aeration issue.
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Lead Driver
Joined: Oct 2005
Posts: 6,129
Likes: 1,919
From: Ponca City, OK
Air in my oil confirmed. A cold front came through last night and temps dropped from 85 yesterday to about 40 this morning and my truck did not like it. So long story short, I got pissed off and decided to start tearing stuff apart until I found something to explain this, and there they were, bunches of tiny bubbles streaming with the oil coming out injector spouts.
So where is the best most likely place to start the hunt? It seems to be getting worse and I've spent way to much time, energy, and money already. Thanks again for any help, we're getting close now.
So where is the best most likely place to start the hunt? It seems to be getting worse and I've spent way to much time, energy, and money already. Thanks again for any help, we're getting close now.
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Lead Driver
Joined: Oct 2005
Posts: 6,129
Likes: 1,919
From: Ponca City, OK
No I haven't. I visually saw the bubbles in the oil draining down the head from the injectors. I'm noticing it on the dipstick now as well.
CNCFAB
Joined: Apr 2020
Posts: 4,875
Likes: 2,006
I have experimented some with my alliant ac's and have found them to run ok up to 3200, above that I get a more seat of the pants power feel, but when hooked to a load it seems as though they have as much or more grunt at 2900- 3200. I have run them as high a 3800psi, but saw no gain, and even some loss in performance. I do not know how much of this is affected by my dtc hi volt high freq idm.
Interested to hear more of our thoughts on this, as well as on pw tables for the ac's.
Maybe we should start a sepperate thread on the subject if there is enough interest
Former Vendor
Joined: Sep 2020
Posts: 2,597
Likes: 695
From: Florence, MT
We have a new AC injector from Alliant which is manufactured by Caterpillar, the OEM. Navistar leased the HEUI from Cat. With 2900 PSI, 3.25PW, 3K RPM it will flow less than the injector at 2000 PSI, 2.25PW, 2K RPM. At 2800 PSI, 3.25PW, 3K RPM it will flow more. Keep in mind the test bench with a single injector does not have the loses of the 7.3 HPOP system, so what your ICP is seeing is going to be different than what the poppet valve gets.
The first new AC injector we bought only flowed 50cc at WOT instead of 160cc...
Here is an example of what 4 injectors do to the oil galley in the head. This stand also does not have the same loses as the complete 7.3 HPOP system.
The first new AC injector we bought only flowed 50cc at WOT instead of 160cc...
Here is an example of what 4 injectors do to the oil galley in the head. This stand also does not have the same loses as the complete 7.3 HPOP system.
Cargo Master
Joined: Mar 2019
Posts: 2,907
Likes: 788
From: Kinnula,Finland
So you are saying that theres no benewit going over 3000psi with "regular" injectors.
How about Hybrids?
Im quessing that those will benewit going up to 3500psi..?
Or even a bit more if system can hold up..
How about Hybrids?
Im quessing that those will benewit going up to 3500psi..?
Or even a bit more if system can hold up..
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Hotshot
Joined: Jul 2008
Posts: 12,782
Likes: 2,142
From: N.GA Mountains
@Bitterroot Diesel Will you start a new thread about ICP/PW, etc so we can discuss what y’all are learning with the test benches???
I was told by a very good tuner that there are no benefits above 2800psi and there is an overall loss of power with ‘extreme ICP’ tunes. This was based on his experience tuning on the dyno. His explanation included the resistance of the poppet to move with higher ICP. A few years ago, the 6.0 crowd discovered high fuel pressure has a similar detrimental affect on power.
I was told by a very good tuner that there are no benefits above 2800psi and there is an overall loss of power with ‘extreme ICP’ tunes. This was based on his experience tuning on the dyno. His explanation included the resistance of the poppet to move with higher ICP. A few years ago, the 6.0 crowd discovered high fuel pressure has a similar detrimental affect on power.
CNCFAB
Joined: Apr 2020
Posts: 4,875
Likes: 2,006
@Bitterroot Diesel Will you start a new thread about ICP/PW, etc so we can discuss what y’all are learning with the test benches???
I was told by a very good tuner that there are no benefits above 2800psi and there is an overall loss of power with ‘extreme ICP’ tunes. This was based on his experience tuning on the dyno. His explanation included the resistance of the poppet to move with higher ICP. A few years ago, the 6.0 crowd discovered high fuel pressure has a similar detrimental affect on power.
I was told by a very good tuner that there are no benefits above 2800psi and there is an overall loss of power with ‘extreme ICP’ tunes. This was based on his experience tuning on the dyno. His explanation included the resistance of the poppet to move with higher ICP. A few years ago, the 6.0 crowd discovered high fuel pressure has a similar detrimental affect on power.
I have been researching this concept for a month or two now, and most of the info I have been digging through is pointing in the direction of what you said, as are my personal experiences with these ac's.
Former Vendor
Joined: Sep 2020
Posts: 2,597
Likes: 695
From: Florence, MT
I started a HEUI injector thread for further discussion.
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