Thread: cold air intake
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Old 02-20-2007, 09:43 AM
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Re: cold air intake

ok you have a 2000 jeep grand cherokee 4.7l 4x4. first of the numbers you read in road and track were for the limited edition 4.7l HO motor with custom built trans but was not even an option till 02. dont believe me...ill show you.

The 4.7-Liter HO engine
A performance enhanced "HO" version of the popular 4.7-Liter V8 engine made its premier in the 2002 Grand Cherokee. The HO engine was a Grand Cherokee exclusive for the 2002-2004 model years, available as an option on Limited models and standard on the Overland - but not available on the Laredo. For the 2004 model year, Jeep added the HO as an option on three new special models, the Freedom Edition, Columbia Edition and the Rocky Mountain edition.

Summary of HO engine feature differences
(Compared to standard 4.7 liter engine)

1. Block - Detonation sensor bosses in the valley 10. Intake - low-restriction intake system (different resonator, air filter, air filter hose and housing)2. Camshaft - custom profile lobes (designed for increased performance)11. Knock sensors - two, stereo3. Connecting rods - modified, with floating wrist pins (vs pressed-fit pins in standard V8)12. Main bearings - tri-metal (vs bi-metal in standard V8, designed specifically for the HO engine)4. Crankshaft - forged steel (vs cast iron in standard V8)13. PCM calibration - unique programming5. Crankshaft damper - unique to H.O.14. Pistons - dome shaped for increased compression ratio6. Cylinder heads - different shaped combustion chambers (for improved airflow). The letters "H.O." are cast on the front end of the heads.15. Spark plugs - platinum tipped7. Exhaust tip - chrome (2002 models only, decontented for 2003 models. Available only as a one-piece assembly with muffler)16. Valves - unique exhaust valves (same lift as standard V8)8. Fuel injectors - higher flow (+3.3 lb/hr)17. Valve springs - upgraded valve springs (intake & exhaust. Larger diameter wire and more coils)9. Intake manifold - modified (shorter runners)

Speed:

0-60 mph: 6.9 (Motor Trend)
0-62 mph: (0-100 km/h): 8.3 (DCX)
1/4 mile / speed: 15.4 / 86.6 mph (Motor Trend)
Top speed (w/ limiter): 118 mph
Top speed (w/o limiter): 128 mph (DCX)

Fuel: Fuel Economy mpg (EPA est., City/Hwy): 14/19
Fuel requirement: Regular unleaded, 87 octane. For maximum performance, Unleaded premium, 93 octane.



so who is the idiot now. hell in motor trends last reveiw a 5.2 could barely pull off a 16.4 in a quarter mile stock. so Like I said dont hate on me. I am just proving a point. been working on autos for over 15 years now performance for 12. and stock for the 4.0l is 17.7...hell thats better then a 98 civic with a 1.6l.they are rated at 18.3 in a quarter.
I know this cause I own one. I have gotten my times down to low 16's but its still slow as hell..