Tall tale?
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Elder User
Joined: May 2004
Posts: 812
Likes: 1
From: Northwest Florida
Tall tale?
Talking with a 30+ year school bus mechanic the other day. He told me that the 7.3 is an International engine that Ford made some mods to. He claims the #7 injector is different than the others as a noise reduction method, and that the 7.3's in his school buses have an extra 60 HP because they don't have the one different injector. Is he full of it, 
or is there some truth to it?
or is there some truth to it?
Lead Driver
Joined: Jan 2007
Posts: 6,708
Likes: 5
From: Kiowa CO
Oh yes, the 7.3 it is an IH engine and the mods that are performed on it by Ford include mostly emission requirements and a few noise reduction additions. I'm sure someone can chime in with a better breakdown of more differences.
Elder User
Joined: Dec 2001
Posts: 582
Likes: 5
From: Kelowna B.C.
If you loose 60 hp in one hole from a different injector he is saying you have atleast 60 hp per hole. The 480 hp for all 8 holes. Can I get one
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Postmaster
Joined: Sep 2008
Posts: 3,220
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From: VA
Awesome...I always wondered where they got these new injectors from. If I wouldve known this a few years ago I couldve gotten yall tons of bus injectors! lol They would sell at a premium. 60hp my azz
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Post Fiend
Joined: Jun 2006
Posts: 9,714
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From: White Mnt's,New Hampshire
the IH school bus and there medium duty trucks have what IH calls a high torque T444E (7.3) in them..they use a differnt injector all together..they also run a bigger non waste gated turbo...thats why they have higher HP and TQ..ford made there changes to the T444E and called it the 7.3 power stoke..
AC injectors are found in the high torque version of the T444E and do not come in any Powerstrokes. They have the same internals as the AB injectors with the exception of the single shot plunger and barrel. However due to them being single shot injectors they flow 160cc. This is due to the way the split shots work. They have a small passage that opens, much like a port in a two stroke engine, that are uncovered that bypass the injection pressure out the side of the barrel instead of out the end through the nozzle. Because of this pause a portion of the travel of the plunger does nothing for injecting fuel so a split shot injects less fuel for the same amount of travel as a single shot.
AC injectors are found in the high torque version of the T444E and do not come in any Powerstrokes. They have the same internals as the AB injectors with the exception of the single shot plunger and barrel. However due to them being single shot injectors they flow 160cc. This is due to the way the split shots work. They have a small passage that opens, much like a port in a two stroke engine, that are uncovered that bypass the injection pressure out the side of the barrel instead of out the end through the nozzle. Because of this pause a portion of the travel of the plunger does nothing for injecting fuel so a split shot injects less fuel for the same amount of travel as a single shot.
Post Fiend
Joined: Jun 2006
Posts: 9,714
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From: White Mnt's,New Hampshire
a lot of us have..thats what single shot injectors are..click on the full force link in my sig...i have the stage 2's ..160cc with moded nozzles....some guy's run the non waste gated van turbo...but to run SS injectors you need custom tuning..
Post Fiend
Joined: Feb 2007
Posts: 14,541
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From: Dallas-Ft. Worth
Supposedly a "cleaner burn". A pilot shot is injected which gets the combustion started, then the rest of the fuel follows in the way Ron described. I would rather have more power & better mileage over a "cleaner burn", but that's what the tree huggin' fruits of the world have done for us. 
Posting Guru
Joined: Jun 2006
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There were changes and updates to the T444E International engine over the years. We have 7 of them from 1996 to 2001 in school buses, ours are 190 to 210 horsepower.
International also went to split shot injectors in the later 90s and our 2001 has a wastegated turbo
International also went to split shot injectors in the later 90s and our 2001 has a wastegated turbo