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LH Performance Modification Discussions
 #300499  by mlasms08
 February 27th, 2013, 9:50 pm
I just want to let everyone know that 4.0L cams are bolt in swaps!!! Same valve lift, slight change in duration.

I bought my new to me 02 Special with a nasty knock. I found the rocker assembly on drivers head was broken. A roller from assembly had been punched thru the head into water jacket. I replaced the head with a used head and I installed 4.0L cams and sprockets. I have about 100 miles on the repair so far with no issues. I will be changing the oil to synthetic on Friday and will then be ok with doing a 100% throttle pull on it. So far it feels awesome!


4593616aa,4593618aa are cams, 4792580ac,4792025ab are sprockets. Less than 250 retail for all. 1 3.5 cam retails for 300
4.0L
CAMSHAFT
DESCRIPTION SPECIFICATIONS
Metric Standard
Bore Diameter 43.038-43.059 mm 1.6944-1.6953 in.
Diametrical Clearance 0.078-0.12 mm 0.003-0.0047 in.
Diametrical Clearance (MAX) 0.15 mm 0.0059 in.
Bearing Journal Diameter 42.939-42.960 mm 1.6905-1.6913 in.
End Play 0.05-0.51 mm 0.002-0.020 in.


VALVE TIMING-INTAKE VALVE
DESCRIPTION SPECIFICATIONS (CRANKSHAFT DEGREES)
Opens 4° BTDC (A) — 1° ATDC (B)
Closes (ABDC) 60° (A) — 65° (B)
Duration 244°
Centerline 118° (A) — 123° (B)


VALVE TIMING-EXHAUST VALVE
DESCRIPTION SPECIFICATIONS (CRANKSHAFT DEGREES)
Opens (BBDC) 61°
Closes (ATDC) 21°
Duration 262°
Centerline 110°


3.5L
Camshaft
Bore Diameter 43.038–43.059 mm
(1.6944–1.6952 in.)
Bearing Journal Diameter 42.939–42.960 mm
(1.6905–1.6913 in.)
Diametrical Clearance 0.078–0.12 mm
(0.003–0.0047 in.)
—(Max.) 0.15 mm
(0.0059 in.)
End Play 0.11–0.35 mm
(0.004–0.014 in.)
Valve Timing—Intake Valve
Opens (ATDC) 3°
Closes (ABDC) 61°
Duration 238°
Centerline 122°
Valve Timing—Exhaust Valve
Opens (BBDC) 56°
Closes (ATDC) 16°
Duration 252°
Centerline 112°
Valve Overlap 13°



edited to correct part numbers
User avatar
 #300544  by 300maximilien
 February 28th, 2013, 9:40 am
Great info. I wonder why others claimed all kinds of modifications were needed to use them before? Excellent job figuring out a solution!
 #300545  by dmondeac
 February 28th, 2013, 9:55 am
Looks like he used the 4.0L cam sprockets as well, which have a different tone ring pattern than the 3.5L cam sprockets. It is nice to know that that the sprockets work with LH computers.
User avatar
 #300548  by paintballdude05
 February 28th, 2013, 11:05 am
dmondeac wrote:Looks like he used the 4.0L cam sprockets as well, which have a different tone ring pattern than the 3.5L cam sprockets. It is nice to know that that the sprockets work with LH computers.
Maybe different than the 98-01 cars, but I guess they are the same as the 02-04's?
User avatar
 #300566  by Bill Putney
 February 28th, 2013, 12:40 pm
300maximilien wrote:Great info. I wonder why others claimed all kinds of modifications were needed to use them before? Excellent job figuring out a solution!
dmondeac wrote:Looks like he used the 4.0L cam sprockets as well, which have a different tone ring pattern than the 3.5L cam sprockets. It is nice to know that that the sprockets work with LH computers.
paintballdude05 wrote:
dmondeac wrote:Looks like he used the 4.0L cam sprockets as well, which have a different tone ring pattern than the 3.5L cam sprockets. It is nice to know that that the sprockets work with LH computers.
Maybe different than the 98-01 cars, but I guess they are the same as the 02-04's?
I believe the mods were needed because the LH sprockets fit differently on the ends of the cams (D-hole) than the 4.0 sprockets to their cams. Are there 4.0 cam sprockets that have the same tone hole pattern as the earlier year LH cars? If not, then that would explain why LH car sprockets (for an earlier year) would have had to be modified so they could be used with the 4.0 cams.

(reason for edit: clarify tone hole pattern)
User avatar
 #300572  by paintballdude05
 February 28th, 2013, 1:12 pm
Our cams have the "D" shaped ends on them. Somebody posted pictures of the 4.0 cams on one of the other sites but I can't recall exactly what shape they were. I think they were either just round or round and keyed.
 #300587  by Shadowvox6
 February 28th, 2013, 3:34 pm
I wonder if timing was effected any?
Would like to see this configuration hooked up to a DRBIII
 #300596  by Shadowvox6
 February 28th, 2013, 4:12 pm
Well, I have a set of LX cam sprockets, and a set of heads.
Maybe time to get a set of 4.0 cams
 #300634  by mlasms08
 February 28th, 2013, 10:23 pm
cam ends are round with a keyway. I used part numbers for cams and sprockets from a 2010 Nitro i believe. tone wheel slot location is the same and the Nitro also uses an NGC controller.
 #300644  by Shadowvox6
 March 1st, 2013, 7:08 am
mlasms08 wrote:cam ends are round with a keyway. I used part numbers for cams and sprockets from a 2010 Nitro i believe. tone wheel slot location is the same and the Nitro also uses an NGC controller.
Then it maybe possible that I will only order the driver side sprocket.
User avatar
 #300654  by Daytrepper
 March 1st, 2013, 11:21 am
Tried to price these at the DD this morning. They said 4702025AB, and 4693618AA are not good part numbers. Do you have the correct ones? I tried running these on moparparts as well and they did not come up.

I am very likely going to do this for my car this summer.

Edit: I grabbed a Nitro vin and called the DD. The correct part numbers for the others are:

4593618AA = cam
4792025AB = sprocket
 #300693  by mlasms08
 March 1st, 2013, 10:02 pm
Daytrepper you are correct. I typed in the wrong number for those 2 pieces, I have edited original post. My apologies and thanks for the correction.
User avatar
 #300706  by FIREM
 March 2nd, 2013, 8:39 am
Based on the specs, the engine should get a bigger gulp of air with the 4.0 cams. Eariler intake opening and longer duration are a plus. Exhaust closing later and having longer duration should help scavanging.
How the PCM manages this and adjusts fuel trims is the unknown at this time.
Dyno testing would help solve the question.
 #300708  by dmondeac
 March 2nd, 2013, 9:54 am
You can check out my 4.0L build for pics of both the cams and the rings , I spent a fair amount time working on this issue.
User avatar
 #300715  by Bill Putney
 March 2nd, 2013, 12:38 pm
dmondeac wrote:You can check out my 4.0L build for pics of both the cams and the rings , I spent a fair amount time working on this issue.
So - *you're* saying to actually see what someone who's actually done it has to say!? What a concept! LOL!

http://300mclub.org/forums/viewtopic.ph ... 31&start=0

What did you do to make the cam and crank sensors work? My guess is that the easiest and cleanest route on a pre-'02 car would be to put a '02+ harness and PCM in? Or do you get into all that here?: http://www.dodgeintrepid.net/showthread.php?t=180952