10 years since SCR technology on trucks

You can't really compare a 20 year old engine to a brand new engine. Just like how you can't compare a 1693 PCTA Cat to a 3406E. I haven't ran a modern engine but I'd wager the engineers that designed it know a bit more than we do.

 

An internal combustion engine with a vgt turbos and parts tolerances nearly to the atomic level cant be expected to eat 70% of it's own fesee and survive.

Look in the intake manifold at that critical 400k mark. There's an inch of carbon clogging it like an artery.
And dont even think about adding a cleaner like Lucas. It works too good . Because that rock hard carbon comes off in sections .... yeah I learned the hard way. First the turbo...later a chunk it bent a valve , kicking off the rocket arm and pinning it under the cam , cracking the head.
Yeah , lug that motor or buy a fleet truck that's been lugged for 400k . You will be sorry . They are packed full of carbon that didnt go out the stack and was returned over and over

 

70%? Not even close. EGR duty cycle on a modern diesel is around 7% or so. As SCR technology advances the EGR duty cycles have dropped. Yes it carbons up the intake. Can't argue with that. Its nasty stuff.

 

Never seen carbon chunks cause damage. Usually something steel does that. Like if the turbo went and the inter cooler, egr and intake system weren't cleaned properly.

 

Vgt turbos are one of the stupidest things I've ever seen, who in their right mind says "let's take this thing that's spinning at 30,000 rpm and make it just adjust" I wouldn't keep that on a new motor, they have them on the ford 6.0s and you can buy a turbo for an e model cat for what pos costs.

 

Well. I flew up to texarkana and picked up a couple 2012 386 that were trade ins from SRT . NOT THE TRUCKS I WANTED BUT ...
Worse mistake but it wasn't my money . @388,000 miles and it took not time at all till the trucks mirrored failures starting with intake sensors and then a week apart turbo failures. One was replaced from a recall the other ...not so lucky.
But the one that killed was in W.va ..the rocker arm bounced around and got between the cam an a corner of the head cracking it.
I bought a test head from RandD department at Cummins "cheap" and had it put on.
The pics that came back were dreadful. I already knew the build up on the intake was bad but not to this degree.
Anyway this builder told me how it all went down... maybe he was an idiot who knows.
Btw both of those units went off the DEF . The only problem I had was idle and picking out what sensors to shut down .

 

Ok thanks for the insite " lol" .

 

The big problem, from what I've been hearing, is the extended service intervals. Especially from larger carriers trying to save money.

 

I remember watching a Video Detroit put out for the New Electronic Series 60 with instruction to allow engine to Lug down to 1100 Rpm for Max fuel Economy. The only way I’ll do it is if easing off throttle to top a hill. I don’t think Detroit cares about destroying my Transmission. It seems to me although not a high torque engine the trans takes the real beating while Lugging