Idle hours VS drive hours

[TomB 1269]

I viewed the video, and I wonder if there is not another issue that contributes to it as well. It is my understanding that in most engines the lifters turn in the lifter journals where as a roll lifter system cannot. I only bring this up as he seemed to touch on the fact that the lifters tended to have some buildup on them in most cases causing them to hang in the journals as well. That along with a "weak" oiling of the cam would lead to this type of failure. I am not an engine builder, but it is my understanding that overheated and poorly maintained oil would tend to cause the build up he was seeing on the lifters.

I am one that does not due oil changes by mileage usually, but by time. I do not tend to hit 5000 miles in a 6 month period, and I have in the past on other cars notice a condensation buildup due to short drive cycle regularly.

In short, I am wondering if short drive cycle, condensation, high oil heat, mileage vs time oil changes, combined with poor oiling of cam and high idle times constitute the primary cause for cam failure. I know that I have been making a concerted effort to get in a little high RPM time on the engine to make sure and get those lifters slung around and scrubbed clean, and to be a little more cognizant of how much I let her idle. I will have to see. I do know she gets put thru the paces at times when the fire tones drop and I am responding to a "big" call, I'll let her have every bit of throttle from each stop sign, and there are 3 before I hit the main road just over a 1/4 mile away.

Be curious as to what others think about my speculation....

 

[seabrook]

I bet you remember when Bob Hope was a star on the radio also.

Lol yes and he did gulf gas commercials- knocks out the knocks

 

[seabrook]

I viewed the video, and I wonder if there is not another issue that contributes to it as well. It is my understanding that in most engines the lifters turn in the lifter journals where as a roll lifter system cannot. I only bring this up as he seemed to touch on the fact that the lifters tended to have some buildup on them in most cases causing them to hang in the journals as well. That along with a "weak" oiling of the cam would lead to this type of failure. I am not an engine builder, but it is my understanding that overheated and poorly maintained oil would tend to cause the build up he was seeing on the lifters.

I am one that does not due oil changes by mileage usually, but by time. I do not tend to hit 5000 miles in a 6 month period, and I have in the past on other cars notice a condensation buildup due to short drive cycle regularly.

In short, I am wondering if short drive cycle, condensation, high oil heat, mileage vs time oil changes, combined with poor oiling of cam and high idle times constitute the primary cause for cam failure. I know that I have been making a concerted effort to get in a little high RPM time on the engine to make sure and get those lifters slung around and scrubbed clean, and to be a little more cognizant of how much I let her idle. I will have to see. I do know she gets put thru the paces at times when the fire tones drop and I am responding to a "big" call, I'll let her have every bit of throttle from each stop sign, and there are 3 before I hit the main road just over a 1/4 mile away.

Be curious as to what others think about my speculation....

Well I have a very silent truck and it has 40k on it I was doing a 80 mile round trip to work 4 days a week before the stupid corona crap... but hey I’ve been working from home for 3 months now so it’s not all that bad anyway..... I think my long drive to work helps also I like you change my oil twice a year regardless of mileage

 

[RAM_Designs]

The idle time is anytime your foot comes off the throttle. Mine seems high so I asked the dealer tech. When the throttle position sensor goes to idle at least in the 6.4l it also shuts off all fuel to the injectors. So technically every time you coast it’s “idle time”. Additional reasons NOT to use 5w-30 oil In the 5.7’s is that it is THICKER, and slings around less. The clearances on the bearings are so tight that running thicker oil can cause reduced oil flow. Think what you want and do as you please .... your truck, your $$$$. But if under warranty keep the 5w-20 in the 5.7’s.

I would never ever ever run a 5w20 in a hemi, period. I'd bet money that the manual allows use for 5w30 and 10w30 depending on temps as well.

 

[gofishn]

I would never ever ever run a 5w20 in a hemi, period. I'd bet money that the manual allows use for 5w30 and 10w30 depending on temps as well.

5w30, if 5w20 is unavailable.
S, even from the factory, we can use it.


Got my Redline yesterday so will ahve to set up an oil chang.e
that Liqui Moly got rid of all noise but still going to switch over to Redline.

 

[Texram155]

So you been running 5W30 the whole time? If so that's great. Just goes to show for the doubters out there that running 5W30 instead of 5W20 is potentially a great start to avoiding cam/lifters down the road and that it has no effect on MDS operation one way or the other.

That's all I do. Just PUP 5-w30 and a frame ultra filter every 6-7k. I don't uses any additives or snake oils. I also have been tuned for the last 47k on the 93oct tune.

 

[buddy guy]

I would never ever ever run a 5w20 in a hemi, period. I'd bet money that the manual allows use for 5w30 and 10w30 depending on temps as well.

No it doesn't. Not since 2016. After that the manual deleted 5w-30 as an alternative. Or I'd be running it now. My accessible dealers won't support warranty if found to be running 5-30 in my 2018

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[Michael Jones]

126 : idle

324 : Drive


Good, bad, ugly? Have 9800 miles roughly..

Any thoughts?

 

[BadHemi2014]

Y'all should enjoy this:


Bought the truck at 106K, it had been a fleet vehicle.
Not sure what the numbers were when I got it, I've added mostly drive hours but more idle hours too.

It probably has a tick but there's broken manifold bolts too so it's noisy all over. Just switched to 5W30 Redline yesterday.

 

[69GWC]

Thats alot of idle hrs..lol

 

[Michael Jones]

And I thought mine was excessive for being newer truck hahaha

 

[dexter]

126 : idle

324 : Drive


Good, bad, ugly? Have 9800 miles roughly..

Any thoughts?

25% idle, what are you doing during that time?

 

[buddy guy]

25% idle, what are you doing during that time?

Getaway truck?[emoji1][emoji38][emoji16]

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[Michael Jones]

25% idle, what are you doing during that time?

Idle time ranges from , hooking up to the camp trailer, remote start in the morning to head to work, after work start up to warm it up in the winter and now to cool it down inside from the sun, idle for few minutes after a oil changes,

 

[Michael Jones]

Getaway truck?[emoji1][emoji38][emoji16]

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What is your meaning on Getaway truck? Not sure on what you're meaning?

 

[crazy jerry]

Y'all should enjoy this:
View attachment 211968

Bought the truck at 106K, it had been a fleet vehicle.
Not sure what the numbers were when I got it, I've added mostly drive hours but more idle hours too.

It probably has a tick but there's broken manifold bolts too so it's noisy all over. Just switched to 5W30 Redline yesterday.

**** one of our work trucks is over 4100 idle and just 50k mi. was still running fine on friday

 

[gfh77665]

126 : idle

324 : Drive


Good, bad, ugly? Have 9800 miles roughly..

Any thoughts?

I have 9720 miles, 253 Drive and 10 idle = 4%.

 

[Machoramdysavage]

1 year old.