difference between IC and Non IC

[randall488]

well, can anybody tell me the differences? i been told the head on a non ic engine is a little different with injector angle and such, plus, it aint a big secret non ic rigs seem to be a little peppier than ic.. why is that? inquiring idiot wants to know..

[skilletky]

non intercooler injectors have 9mm injector nozzles, intercooled trucks have 7mm. the non intercooled heads have larger injector bore for the 9mm tips. the non intercooled injectors are also larger that intercooled. i hear they are near the same size as POD's. ive heard people making around 350 to 400 on a stock non intercooled injector. the bowl of the piston in a non itercooled engine has a wider bowl than the intercooled engines. nonintercooled injectors have a 155* spray angle and intercooled's have a 145* spray angle

[RCCUMMINS89]

Yep..............

i/c nozzles can make up to about 300rwhp, where as non i/c can make up to 380ish rwhp.

Non i/c nozzles are 4 hole, where as i/c nozzles are 6 hole.

Only downside is the non i/c heads are VERY common to crack around the injector bore.

[randall488]

thanks! what does the spray angle affect?

i assume more fuel is shot down towards the bowl of the piston but again. just an assumption.

[RCCUMMINS89]

The spray angle affects ................well just that. YOu want to match the spray angle to the bowl of the piston so you don't spray outside the bowl. From personal experience a 155 angle will be more responsive and make more power........however, if you don't match the angle to the bowl they will be VERY dirty.

[randall488]

good to know. thanks!

[SuperiorRam]

I run 145 sticks with the 155 bowl and lots of timing

[Remps]

Iirc, isn't the camshaft grind slightly different between the two? As well as the camplate in the IP?

[Mark Nixon]

Non-intercooled uses a dual diaphragm, splash lubed vacuum/power steering combo.
The injectors and pistons use a 155* spray patterm intercooled is 145*
The injection pump uses a wax "motor" to run the timing piston (KSB).
The Non-Intercooled injection pump has deeper transfer slots in the rotor's tip, this may be to some advantage from a volume standpoint.
Early non-intercooled pumps (1989 and some 1990s) have screw-in plugs over the AFC pin, whereas most others have steel shot driven into bores to retain it.
The intercooled injection pumps have shorter delivery valve/line adapters, which also make the lines unique.

The intake plate is basically flipped 180* between intercooled an non-intercooled.
The turbos are quite different.
The injecton lines route differently between the 2 engines.

The non-intercooled A/C mounting brackets are totally different from non-intercooled, as is the compressor, condenser and A/C lines.
The upper coolant inlet is radically different between the 2.
The radiators are significantly altered between the 2.

The camshaft is also slightly more robust on the non-intercooled engines.

Mark.

[RCCUMMINS89]

Well...............that pretty much covers it........just in the engine compartment.

[Deathrod]

Guys with non ic motors are quite a bit cooler too

[RCCUMMINS89]

I know................they can run marine angled injectors. LOL.