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non HO to HO swap?

10K views 14 replies 6 participants last post by  scjeep4.7HO 
#1 · (Edited)
Hi all ive got ? i just got a 2000WJ with a blown none HO 4.7 motor my ? is what is involved in doing the HO swap? .. I already have a 03 4.7 HO motor i just need to know whats involved .....

thanks
 
#2 ·
Well I believe the 4.7L HO has Knock sensors that automatically control the engines timing as its designed to run on 91 octane. If you put a cheaper grade in, knock sensors pick that up and re-calibrate for it. if you were to swap it you would have to always ensure you're running atleast 91 octane fuel or swap over the ECU if you got that as well.

If you want to use the HO parts to upgrade your stock motor, swap over the cams and the intake and the intake manifold (i think?) and get a tune and that should make it pretty similar to the HO 4.7L.

Again I'm not entirely sure on all this, but it should give you a good starting point. If you could clarify, do you have the ECU (computer) for the new high output engine?
 
#3 ·
Thanks ... I know about the knock Sen and the ecu but is there an add on for the Harness that I can do with out changing the whole harness out ? the motor came out of GC so its all the same I geuss .. Oh and I know that the intake for the air box is also different but ill probably just put a Cai on it
I did an add on my 88 mustang it didn't have mass air that just Consisted adding some wires and changing the ecu so i was wondering if its the same deal ...
again thanks ..joe
 
#6 ·
My 2004 4.7HO is a 16 tooth. What makes the difference is a 16 tooth operates with the JTEC PCM where the 32 tooth is for the NGC PCM.

The PCM won't care if you run one standard knock sensor or the 2 "Stereo" knock sensors from the 4.7HO. I don't think it's needed on the standard 4.7 since the compression is not as high as the 4.7HO, unless you are doing modifications to it that would make it nessecary.
 
#11 · (Edited)
As long as your PCM is for the same tooth count as the replacement engine then it will run it just fine. There are only 2 versions. One is an earlier version 99-up to some 04's and run off of the JTEC PCM and the newer is the NGC PCM for some 02's and up. The JTEC is a 3 plug PCM with separate TCM and the NGC is a PCM and TCM all in one and has 4 plugs. older version runs off a 16 tooth count tone wheel where the newer one runs off a 32 tooth tone wheel. If both are older versions then your PCM will run it just fine. There are other differences when you talk about the two motors but that is for another day.
 
#12 ·
Thank you.. Now what about the knock sen the HO has two of them ..is wire harness different? or can I just change that part of the harness?

Thanks
TE=scjeep4.7HO;281723]As long as your PCM is for the same tooth count as the replacement engine then it will run it just fine. There are only 2 versions. One is an earlier version 99-up to some 04's and run off of the JTEC PCM and the newer is the NGC PCM for some 02's and up. The JTEC is a 3 plug PCM with separate TCM and the NGC is a PCM and TCM all in one and has 4 plugs. older version runs off a 16 tooth count tone wheel where the newer one runs off a 32 tooth tone wheel. If both are older versions then your PCM will run it just fine. There are other differences when you talk about the two motors but that is for another day.[/QUOTE]
 
#13 ·
There are 17 differences between the 4.7 and 4.7 HO:

1. Block - Detonation sensor bosses in the valley

2. Camshaft - custom profile lobes (designed for increased performance)

3. Connecting rods - modified, with floating wrist pins (vs pressed-fit pins in standard V8)

4. Crankshaft - forged steel (vs cast iron in standard V8)

5. Crankshaft damper - unique to H.O.

6. Cylinder heads - different shaped combustion chambers (for improved airflow). The letters "H.O." are cast on the front end of the heads.

7. Exhaust tip - chrome (2002 models only, decontented for 2003 models. Available only as a one-piece assembly with muffler)

8. Fuel injectors - higher flow (+3.3 lb/hr)

9. Intake manifold - modified (shorter runners)

10. Intake - low-restriction intake system (different resonator, air filter, air filter hose and housing)

11. Knock sensors - two, stereo

12. Main bearings - tri-metal (vs bi-metal in standard V8, designed specifically for the HO engine)

13. PCM calibration - unique programming

14. Pistons - dome shaped for increased compression ratio

15. Spark plugs - platinum tipped

16. Valves - unique exhaust valves (same lift as standard V8)

17. Valve springs - upgraded valve springs (intake & exhaust. Larger diameter wire and more coils)
 
#15 ·
I reused my HO knock sensors on from my 4.7HO on the fully bulit NON HO motor in my jeep right now. It still has only one plug but has 2 knock sensors coming out of one plug. Yours only has one plug so it should just plug right in and bolt right in the valley.
 
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