Jeep Strokers

I'm doing a rebuild of my 4.0 and need a new cam. Factory cams are no longer available but I'd like to stick with a wider cam lobe for durability. Mopar offers two cams P4529228 and P4529229 and I need to know which would give me a smooth idle but also good torque range up to 3500 rpm, with cruising rpms of 2500-3000 rpm.

Specs-------------------------------------------Stock 96-'04 / P4529228 / P4529229
Advertised Intake Duration------------------------- / 253 / 240 / 248
Advertised Exhaust Duration----------------------- / 259 / 240 / 248
Intake Duration @ .050" Lift -----------------------/ 188 / 199 / 202
Exhaust Duration @ .050" Lift ---------------------/ 190 / 199 / 202
Valve Lift (Intake) ----------------------------------/ 0.408 / 0.430 / 0.440
Valve Lift (Exhaust) --------------------------------/ 0.414 / 0.430 / 0.440
Intake Opens @ .050" Lifter Rise (BTDC) deg ----/ -16 / -8.5 / -7
Intake Closes @ .050" Lifter Rise (ABDC) deg ----/ 24 / 27.5 / 29
Exhaust Opens @ .050" Lifter Rise (BBDC) deg ---/ 20 / 27.5 / 29
Exhaust Closes @ .050" Lifter Rise (ATDC) deg ---/ -10 / -8.5 / -7
Advertised Intake Opens (BTDC) deg --------------/ 12.4 / 12 / 16
Advertised Intake Closes (ABDC) deg --------------/ 60.9 / 48 / 52
Advertised Exhaust Opens (BBDC) deg ------------/ 49.8 / 48 / 52
Advertised Exhaust Closes (ATDC) deg ----------- / 29.2 / 12 / 16
Valve Overlap deg (advertised) --------------------/ 41.6 / 24 / 32
Lobe Separation Angle deg ----------------------- / 107.5 / 108 / 108
Intake Centerline Angle deg -----------------------/ 110 / 108 / 108

The P4529229 will do fine.

So the idle will still be smooth and it will play well with the stock PCM? Trying to avoid expensive springs or driveability issues. The 32RH typically shifts at 3500-4000 rpms, so I don't care about top end power, but it's hard to find any feedback on how these cams will idle.

GASnBRASS wrote:So the idle will still be smooth and it will play well with the stock PCM?

Yup.

Thanks for the response. Would the 28 be more suitable for prolonged low rpm crawling and smoothest idle, using a cloyes adjustable timing set to fine tune where the power band is?

I think the 28 would be far too biased towards low rev torque in a stroker and have little to give above 4k rpm.

This is going into a stock 4.0 rebuild, not a stroker. I'm just asking here because all I get is silence on any other forum, they're too busy arguing about tire sizes and soft top brands. Actual cam feedback has been hard to find.

GASnBRASS wrote:This is going into a stock 4.0 rebuild, not a stroker.

If you're not bothered about having the engine nose over above 4000rpm, get the 28 cam and enjoy a buttload of low rev torque.

Stock OBDII cams are available from Melling, I got mine at O'Rielys.

Does the melling cam have 2/3" wide lobes like stock or are they 1/2" like most aftermarket cams? And do you know where they are made?

The Melling cam does have the wide lobes, I'm not sure who ground them?, but they have limited ID on them like an OE cam has.

Thanks for the feedback about these cams. My TJ has the 32RH with 33's and 4.10 gears, but I may end up using it in the future for light towing (atv's and such), so I think I'll try the Mopar 28 cam for the low end torque. If it doesn't suit the motor or my driving habits I guess I'll tear the head off and swap in the Melling cam.