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?
The engine is made by international it is the #8 injector that is different. If the school buses had an extra 60hp everyone on FTE would be riding the short bus .
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My two cents, Jeff
Early 99 F350 4X4 CC DRW 6spd. 6637, MKO 4" turbo back 5" straight piped exhaust 6" tip, ISSPro Gauges, Pyro, Boost, Water temp, DP Tuner Stock, 40tow, 60tow,80econo, 120race, KCM S.S. HPX line, ITP Overboost Annihilator, Auto Enginuity, GPR LED Indicator. 6.0 intercooler, CCV mod, EBPV delete,Wastegate Mod. 325,000 miles and counting.
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.
__________________ Chris
2002 F350 XLT, 7.3L CC 4x4, LWB, SRW, Autometer Ultralites, DP TUNER, BTS Trans, 6.0 tranny cooler, AIS w/zoodad, Warn Hubs, 4" MBRP exhaust, '08 rear end cover, Foil Delete, Heated Tow Mirrors, AIH Delete, Homemade CCV mod., Bilsteins. The Silver Bullitt PAA# 24
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
__________________ -Tristan 2000 F-250 XLT 4x4 Ext Cab SB Auto DP Tuner 60T 80E 120R 4" Turbo Back WW F650 Dash DiPricols MAC Intake Foil Delete CCV Firestone Bags LED...
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.
__________________ Early 99 7.3 F350 auto,GTP38R BB turbo, AFE stage2, 5" strait pipe, DP live tuned-PMT1 soon to happen, 140 IDM, Terminator Modified 17* HPOP , DIY fuel bowl delete, DI Regulated Return fuel feeding Ryan Casserly's SS stage 2's moded EPD process 100% over nozzles http://fullforcediesel.com/ exploded view of a 7,3 << more pix of my truck
So the guy is right in a way? Has anybody gone this route?
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..
__________________ Early 99 7.3 F350 auto,GTP38R BB turbo, AFE stage2, 5" strait pipe, DP live tuned-PMT1 soon to happen, 140 IDM, Terminator Modified 17* HPOP , DIY fuel bowl delete, DI Regulated Return fuel feeding Ryan Casserly's SS stage 2's moded EPD process 100% over nozzles http://fullforcediesel.com/ exploded view of a 7,3 << more pix of my truck
Curious, why would Ford want to use the split shots over the single shots then?
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Keith
"The Wicked Flee When No Man Pursueth, But The Righteous Are Bold As A Lion."
'00 F350 CC LB 4x4 PSD - DP Live Tuning, ATS housing, 6.0 IC, Ford AIS, 4" Magnaflow, BD X-Monitor, Front leveling kit, Firestone air bags, JWVB, FRx, HPX, coolant filter, Hutch mod, ITP in-tank, Carter lift pump, CCV, Tru-cool, AIH delete, OBA, cold a/c
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.
The SS's use what is called pilot injection to meet specific emissions standards, and I believe they are a bit quieter.
EDIT: Beat to the punch
__________________ Paul Out on the farm!
2002 F-350 Powerstroke - AFE "Big Boost" BHAF filter element, Stancor GPR, DB Electrical 4KV starter
76 F-250 CamperSpecial - Hoping for a DT360 and a Spicer 6+1 trans
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
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2004 E-450 6.0 142,500 miles
7,500 mile, 15 quart oil changes, 5W-40 Rotella.
UOAs consist of checking for metal on drain plug magnet. All stock, no mods. Dyed fuel with no additives. Never been reflashed.
Total parts replaced;
one EGR valve, one turbo.
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or is there some truth to it?
RONNIE 
