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CW
GenIII
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2/13/2002
21:13:38

Subject: 4.7 HO cam specs
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I finaly got the manual for the 4.7 HO engine. Specs are:
Intake
lift .472" VS .443"
duration 236 VS 243<----think is misprint

exhaust
lift .429" reg 4.7 same
duration 250

The only difference is in the intake lift and duration. I am not to hopful as to what this will do to my engine. Very little I think but I will still try it and see. I am kinda bumbed now. :-( Thought at least the duration would be better on the exhaust side


2001 RC 4.7 5sp 9.25" 3.92 LSD
Ported 68mm throttle body, IAT adjuster, 3" flowmaster cat back, TPS @ .76V, 4" cold air, Roadmaster active suspention, Removed Third cat. Electric fan Convertion, Awaiting HO cams.
Working on adjustable fuel pressure with return.

CW
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2/13/2002
21:17:07

RE: 4.7 HO cam specs
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Oh I forgot to mention got the springs as well. They are the exact same thing as the regular 4.7 one so all I am going to do is swap the cams.

2001 RC 4.7 5sp 9.25" 3.92 LSD
Ported 68mm throttle body, IAT adjuster, 3" flowmaster cat back, TPS @ .76V, 4" cold air, Roadmaster active suspention, Removed Third cat. Electric fan Convertion, Awaiting HO cams.
Working on adjustable fuel pressure with return.

BlackDak02
*GenIII*
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2/13/2002
23:17:26

RE: 4.7 HO cam specs
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CW, don't the HO engines have higher compression?
Dunno, maybe the diff on the intake side is to get more mass in there for those pistons to do their work if that's the case.

2002 Black CC SLT 4x4
4.7L 45RFE 3.55 LSRD

CW
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2/13/2002
23:54:28

RE: 4.7 HO cam specs
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They have higher compression slightly different intake. If this doesn't work very well I think I will wait for KRC to see what they come up with.

2001 RC 4.7 5sp 9.25" 3.92 LSD
Ported 68mm throttle body, IAT adjuster, 3" flowmaster cat back, TPS @ .76V, 4" cold air, Roadmaster active suspention, Removed Third cat. Electric fan Convertion, Awaiting HO cams.
Working on adjustable fuel pressure with return.

Todd Bouton
Dodge Dakota
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2/14/2002
09:20:52

RE: 4.7 HO cam specs
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CW,

Been reading bout your posts and these cams and such, good idea.

I don't take the time to read any mags,

what is the HP rating of this new 4.7HO?

I figure with my inexpensive, but proven mods, and if it put out 235 at the crank, then I'm running at least about 250HP. I have the two wheel drive, LSD, with the 5spd, so what would the drivetrain loss be?

Todd Bouton



CW
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2/14/2002
09:28:44

RE: 4.7 HO cam specs
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HO is 270 in the book. Drive trail loss going from crank to wheel HP? Not sure. 20%?

2001 RC 4.7 5sp 9.25" 3.92 LSD
Ported 68mm throttle body, IAT adjuster, 3" flowmaster cat back, TPS @ .76V, 4" cold air, Roadmaster active suspention, Removed Third cat. Electric fan Convertion, Awaiting HO cams.
Working on adjustable fuel pressure with return.

Muzzy
GenIII
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2/14/2002
16:25:16

RE: 4.7 HO cam specs
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The exhaust valves are different part numbers between the HO and regular 4.7. I think they put larger diameter exhaust valves in the HO. Also, I found out the intake and exhaust valve springs on the HO are the same part number. I ened up ordering 16. The retainers are the same for both engines.

Hey CW, do you think we'll run into any piston to valve clearance problems running the stardard crank and pistons?



CW
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2/14/2002
20:06:40

RE: 4.7 HO cam specs
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That is my next question and concern but the lift is only .030. Not a bid difference. I looked up the exhaust valve size it is the same as well. :(

2001 RC 4.7 5sp 9.25" 3.92 LSD
Ported 68mm throttle body, IAT adjuster, 3" flowmaster cat back, TPS @ .76V, 4" cold air, Roadmaster active suspention, Removed Third cat. Electric fan Convertion, Awaiting HO cams.
Working on adjustable fuel pressure with return.

Muzzy
GenIII
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2/15/2002
01:27:39

RE: 4.7 HO cam specs
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I am glad I didn't order any :) I wonder why the Jeep dealer lists them as a different part number..? The parts guy couldn't give me any specs on anything. He was just comparing part numbers for me. I should gain a bunch from the port work I will do though. The Dodge dealer didn't know when the cams would come in. When I ordered the springs from the Jeep dealer, he told me next week. I hope it doesn't take a month to get my cams.

As far as piston-to-valve clearance...I think I will mock up the engine with the old head gaskets first before putting everything together to run. Just to be safe...Paranoid since I don't think warranty is going to cover this..he he.



Brian024.7
Dodge Dakota
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2/15/2002
12:56:51

RE: 4.7 HO cam specs
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1st comment: sweet, I only need one cam then, half the cost.

2nd: i've seen you guys talking about changing the head gasket. I have no experience with this engine, but in all the SOHC honda engines I've worked with, you don't need to take off the head to change the cam. So whats the deal with the 4.7, do you have to or not?



Brian024.7
Dodge Dakota
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2/15/2002
13:03:59

RE: 4.7 HO cam specs
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forget i even said anything about the 1st comment on only buying one cam...

I have a DOHC 4 cylinder mind-set...don't mind me, I realized i wasn't thinking straight and will still have to buy two...lol



Muzzy
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2/15/2002
14:41:29

RE: 4.7 HO cam specs
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Brian-

You don't have to pull the heads off to swap the cams. I am pulling mine off so I can port/polish the intake and exhaust ports. There is a major step inside the exhaust valve seat. Plus the factory casting flaws eat up horsepower. I have seen 15-20% increase in HP just from a good port and polish on your heads. It also depends on the motor and how good the ports are to start with.

-Muzzy



CW
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2/15/2002
14:46:08

RE: 4.7 HO cam specs
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Be careful on the intake side just clean it up a little, it has got good flow already.

2001 RC 4.7 5sp 9.25" 3.92 LSD
Ported 68mm throttle body, IAT adjuster, 3" flowmaster cat back, TPS @ .76V, 4" cold air, Roadmaster active suspention, Removed Third cat. Electric fan Convertion, Awaiting HO cams.
Working on adjustable fuel pressure with return.

Brian024.7
Dodge Dakota
JOIN HERE


2/15/2002
15:12:05

RE: 4.7 HO cam specs
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ok cool

I'm just looking for a simple upgrade worth a few HP, so I wouldn't do any porting or polishing of the heads



muzzy
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2/15/2002
21:13:02

RE: 4.7 HO cam specs
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I remember Duner saying the intakes looked pretty good from the factory. I just planned on cleaning up around the valve guides, blending the seat, and removing any casting flaws. I worked in a machine shop for an performance engine builder for 2 years while in college. I learned how to port and polish heads from my boss and a guy named Jerry Arnold. Jerry at the time held 3 NHRA division 3 titles for Econ-Altered Dragsters. I did mostly head work and engine assembly. My boss did all the crank grinding and block boring. It didn't pay as much as doing engine overhauls for the local Dodge dealer, but the experience was invaluable. Plus I didn't come home every day with bleeding knuckles from working one someones car they didn't take care of. That was 12 years ago though and cars seem to be a little better engineered today.

-Muzzy :)



01Motorsport
Dodge Dakota
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9/22/2004
12:05:24

RE: 4.7 HO cam specs
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Here's a great old tech post for you HO cam fans. Not everyone realizes that the main difference between the Jeep HO cam profile and stock 4.7 cams is on the INTAKE side, as CW pointed out. Just some fun FYI here. For you newbies, the HO mod is worth the time/effort/money. Dyno proven 15 HP/ 25 Ft.Lbs TQ. The cams run about $130 each from an accomodating Dodge parts counter. '01 4.7 5-spd 3:92/HO cams/homebrew intake/Flowmaster 70w/2 1/2" duals/Bosch 4118/Mobil 1



Dakota777
Dodge Dakota
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4/09/2020
20:55:56

RE: 4.7 HO cam specs
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Thanks for the input guys it was helpful. I have
a 2002 Dakota, 4.7L, converted to a 545RFE 5
Speed, and am looking at upgrading my cams to the
HO also. Hopefully I can get them for a good
price, or a good bone yard find.



Horace
Dodge Dakota
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4/15/2020
23:23:44

RE: 4.7 HO cam specs
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I'm working on an HO myself and found
wjjeep.com an excellent source for HO
specs



TexTodd
Dodge Dakota
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7/10/2020
17:08:37

RE: 4.7 HO cam specs
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I did this Mod myself to my 01, 4.7 manual trans
over 17 years ago.
Still driving it almost daily, 266K miles on the
same motor! Just change the oil with good oil, I
did all oil changes myself!



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