I am in the shop now. 18:1 with twin 625 turbos (both the big ones) got 330K with 770HP and 2400Tq to the rear wheels. Never had any issues until last week, losing a gallon of water per day... Pulled the head, its junk, number one cylinder has been bouncing. I used all genuine Cat parts, updated head bolts etc... Im now learning that I should have gone with 16:1 pistons in the first place. Im a big fan of twin turbos because you get more volume with less pressure (pressure equals heat) I had 42 PSI all day long, never saw the pyro go over 900 (my powder coated hot sides look like new). All good, except that the head gasket will never survive that kind of cylinder pressure. Cat keeps recommending all sorts of band aids to "fix" the Acert head issue but bottom line, the high compression needed to meet EPA requirements is just too much for the technology they put into the head and head gasket design.
6nz"d BXS Acert thumping noise
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by w9l, Jun 29, 2020.
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Guntoter: that’s a lot of twist power you got there.
Yes I like having the 2 turbos.
I’m not 100% sure what’s in the program I have but so far it wasn’t the reason for the failure as far as I can see.
Last driver was hard on this BSX.
He drove the truck back to the yard with a hole punched through the valve cover from the rocker studs breaking and the engine rattling. Not sure where he was when that happened.
I haven’t got a chance to do much of anything with this engine when the head cracked.
My boss said all 6 pistons showed overheating issues on the skirts and the sleeves.
I’ll still try the 18:1 and see what happens.
I’ve wondered what the guys did that made 3,000 horses out of the Cat engines for the truck rodeo up here in Ontario/Quebec. -
My question on the rodeo trucks is how they keep a driveline in them...
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My big Rodeo question is DRIVELINE???????
Shawn2130 Thanks this. -
Starting to wonder if my thumping is a result of sucking air into fuel lines. Everyone that has tried to solve this for me has been asked could it be sucking air? One replaced the Cat primary screen canister and says all good. I get under truck to clean condensation drain for sleeper and notice splitter valve thing is dripping a tad and the fuel line out of top of pass side tank is covered in fuel saturated dust...... seems they all want to cure the problem with a few keystrokes on the laptop... Don't get hands dirty that way....
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What 2 big turbos are those from that you’re running on your C15?
I’ll consider checking them out.
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