Quick fix.

[ShadowsPapa]

I try to keep mine in lower RPMS and don't flog it like a rental.

I wonder if letting the RPM stay UP might actually help.
1. you have more oil pressure
2. you get more HP from the RPM - running lower RPM places more of a load on the engine and it's more likely to kick into high lift mode.
Running under heavy load at 2,200 RPM is likely worse than running at 3,000 RPM.
You'll have it pushing into high lift due to the low RPM load - more torque/power required you are forcing it into high lift by trying to force low RPM.

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[Stan H]

I wonder if letting the RPM stay UP might actually help.
1. you have more oil pressure
2. you get more HP from the RPM - running lower RPM places more of a load on the engine and it's more likely to kick into high lift mode.
Running under heavy load at 2,200 RPM is likely worse than running at 3,000 RPM.
You'll have it pushing into high lift due to the low RPM load - more torque/power required you are forcing it into high lift by trying to force low RPM.

https://www.jlwranglerforums.com/fo...really-help-the-pentastar.152002/post-3146082

According to this its Hammer down!!

 

[ShadowsPapa]

https://www.jlwranglerforums.com/fo...really-help-the-pentastar.152002/post-3146082

According to this its Hammer down!!

Totally disagree with a need for "WOT" runs - but I totally agree STOP BABYING THESE THINGS!
Cut it out! Stop trying to keep your RPM down in the low 2s when towing or hauling. It's not smart, it's not good, you are doing your engine NO favors.

But best of all - he also says the heavier oil, well, isn't a good idea -

A thicker oil didn't do so well here (on long sit times +cold start) and contributed to a overall increased engine wear especially in the head and cam bearings.

I just don't get non-engine people trying to outthink the SAE engineers and oil chemists.

Anyway, the worst thing you can do for any engine is try to force lower RPM - you increase the combustion pressures and temperatures - you force it to go into high lift mode, you are operating outside of the sweet spot.

Let it run higher RPM.
I'll never ever understand those who say "I shift manually and try to keep my RPM down around 2,200" (or whatever crazy low number they toss out)
You are abusing it, IMO.
I even run my 4.0 in the mid to upper 2,000s and only hit 5th at above 65 mph

WOT, no, but I've never sweated any of my engines running up in their power band. I'm used to engines running 3,000 RPM at 65 mph and modern engine handle higher RPM a heck of a lot better than the old stuff.

 

[Stan H]

Totally disagree with a need for "WOT" runs - but I totally agree STOP BABYING THESE THINGS!
Cut it out! Stop trying to keep your RPM down in the low 2s when towing or hauling. It's not smart, it's not good, you are doing your engine NO favors.

But best of all - he also says the heavier oil, well, isn't a good idea -


I just don't get non-engine people trying to outthink the SAE engineers and oil chemists.

Anyway, the worst thing you can do for any engine is try to force lower RPM - you increase the combustion pressures and temperatures - you force it to go into high lift mode, you are operating outside of the sweet spot.

Let it run higher RPM.
I'll never ever understand those who say "I shift manually and try to keep my RPM down around 2,200" (or whatever crazy low number they toss out)
You are abusing it, IMO.
I even run my 4.0 in the mid to upper 2,000s and only hit 5th at above 65 mph

WOT, no, but I've never sweated any of my engines running up in their power band. I'm used to engines running 3,000 RPM at 65 mph and modern engine handle higher RPM a heck of a lot better than the old stuff.

Yes and what they do these days to help smooth out those high rpms on those old engines is like fluid dampners and have rods and pistons all within miniscule amount of weight from one another by basically placing high end aftermarket internals in old blocks. Sure makes for a heap of money but its awful fun to see a small block do 6 & 7grand.

 

[Blade1668]

I’m with you on not trying to cause problems, or animosity. If I’m not mistaken in the video when he tried to order a cam there were 12,000 on back order. That sounds like a LOT more than just a few percent that are failing. Even taking into account how many they would order to have in supply inventory, that’s still a LOT of cam failures.

Some loosely calculations of a higher number is still substantial less than 5% of failures. Going with say "20,000" have had this problem out of 10,000,000 kinda puts it in perspective. That's 20 engines out of 10,000 vehicles. Or 10 out of 5,000 vehicles. Factor in how some of the vehicles have been "used" that has led to the cam shaft and rockers failing. I'm not always a optimist but....

I wonder what kind of bath the owner took on that trade in? That went straight to auction as is.

I regretfully know of a TJ Rubicon that had been "neutered" AKA slammed with hydraulics and made into a total P.O.S. that dumped hydraulic fluid everywhere it ended up at auction then sold for scrap. A sad thing for a brand new Rubicon TJ.

 

[Zachanadandy]

Totally disagree with a need for "WOT" runs - but I totally agree STOP BABYING THESE THINGS!
Cut it out! Stop trying to keep your RPM down in the low 2s when towing or hauling. It's not smart, it's not good, you are doing your engine NO favors.

But best of all - he also says the heavier oil, well, isn't a good idea -


I just don't get non-engine people trying to outthink the SAE engineers and oil chemists.

Anyway, the worst thing you can do for any engine is try to force lower RPM - you increase the combustion pressures and temperatures - you force it to go into high lift mode, you are operating outside of the sweet spot.

Let it run higher RPM.
I'll never ever understand those who say "I shift manually and try to keep my RPM down around 2,200" (or whatever crazy low number they toss out)
You are abusing it, IMO.
I even run my 4.0 in the mid to upper 2,000s and only hit 5th at above 65 mph

WOT, no, but I've never sweated any of my engines running up in their power band. I'm used to engines running 3,000 RPM at 65 mph and modern engine handle higher RPM a heck of a lot better than the old stuff.

This is a high compression engine that doesn't make peak torque until 4100rpm or peak hp until 6200rpm. If you aren't using WOT ever I'm pretty sure the 8 speed is shifting well before peak torque and about 50% of the way to peak hp. And yet people want to drive it around between idle and 3k rpm like it's an old v8. It's a high revving engine. If you want it to get out of its own way you have to put your foot in it. We are pushing 80k miles between 2 v6 powered, lifted, heavily wheeled rigs without the slightest issue and they both see peak power on a regular basis. Even the 392 doesn't make peak torque until 4k and peak hp until 6k. These aren't big blocks from the 60s or 70s that red lined just above 5k rpm. It's just waking up at that point.

 

[ShadowsPapa]

This is a high compression engine that doesn't make peak torque until 4100rpm or peak hp until 6200rpm. If you aren't using WOT ever I'm pretty sure the 8 speed is shifting well before peak torque and about 50% of the way to peak hp. And yet people want to drive it around between idle and 3k rpm like it's an old v8. It's a high revving engine. If you want it to get out of its own way you have to put your foot in it. We are pushing 80k miles between 2 v6 powered, lifted, heavily wheeled rigs without the slightest issue and they both see peak power on a regular basis. Even the 392 doesn't make peak torque until 4k and peak hp until 6k. These aren't big blocks from the 60s or 70s that red lined just above 5k rpm. It's just waking up at that point.

I don't "floor it" but it sees 5,000 pretty regular. Shifts are really delayed. It will hold 5th to keep up speed some folks would be screaming to let it shift. Just haven't needed true foot against the floor WOT. The tach spends a lot of time way above the comfort zone of many because I don't like lugging, and to me 3,000 at 60 is normal engine speed.
I have zero concerns about valve guides. Not a bit. I think that is overblown. We've been using positive seals for many years.
Besides, my normal driving means RPM, even for my 4.0

 

[BillyP]

I’ve always driven EVERYTHING like I stole it. Even straight off the lot. Break it in like you’re going to drive it is my opinion. A lot of people think I’m crazy for that. To each their own. Every vehicle I have ever had has lasted, and given me no major problems running them like that. All of my vehicles have been 245k miles and higher when I have gotten rid of them. I have known numerous people that babied their vehicles and they constantly give or gave them major problems. I remember as a kid my Dad flooring my Granny’s car to get the soot out it. She did drive everywhere no faster than 35 mph.

 

[Stan H]

Some loosely calculations of a higher number is still substantial less than 5% of failures. Going with say "20,000" have had this problem out of 10,000,000 kinda puts it in perspective. That's 20 engines out of 10,000 vehicles. Or 10 out of 5,000 vehicles. Factor in how some of the vehicles have been "used" that has led to the cam shaft and rockers failing. I'm not always a optimist but....



I regretfully know of a TJ Rubicon that had been "neutered" AKA slammed with hydraulics and made into a total P.O.S. that dumped hydraulic fluid everywhere it ended up at auction then sold for scrap. A sad thing for a brand new Rubicon TJ.

I cried just a little...that guy needs his head examined .

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