Acert C15 versus 6NZ C15

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J spreader

New member
I am trying to make a decision on what to put together for a new truck and wondering if anyone here has experience rebuilding either of these engines? I have heard that a Acert has a well built bottom end but they are very finicky about how the ECM is tuned if fuel mileage is on the list of performance goals. I have also have heard that a Acert can be put together with 6NZ wiring harness and ECM which might possibly help. I don't know if these stories are true or not maybe someone here does.
Any info is much appreciated!
 
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RonG

Well-known member
Welcome to the board.I am sure someone here will have some answers for you,you came to the right place.There are some very knowledgeable members here that are up to date on these things that would be happy to share their knowledge with you.Ron G
 
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Goodysnap

Well-known member
I have done in-frames on a good share of the current models. The 6NZ is by far the most popular for reliability and repairs in general. Though all the C15's are virtually similar and based off the 3406 platform. Just more stuff bolted on- all the way up to the SDP with ARD. I could not see any advantage to creating a hodgepodge of mixing engines and parts together. Just makes things a mess to sort through if there is ever an issue. I have seen some NXS - MXS engines that have been switched over to single turbo. I personally prefer to see it how it is original and have turned away some for less. There is way more to be gained in fuel mileage by picking the correct gearing and trans for the application than in the engine. Most of the fuel mileage is going out through your Right foot.;-)
 
J

J spreader

New member
Thank you very much for the info! So if I'm reading your experience correctly the 6NZ is still going to provide the cheapest cost of operation even if the Acert does have a slightly heavier bottom end?
 
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Goodysnap

Well-known member
I'm not sure there is any difference in the bottom ends. The 6NZ's seems to be real popular with steel haulers and the like-------single turbo , No IVA . Lets just say, the newer the engine, the more parts there are to break and things can be more labor to repair. If simple and cheap is what you prefer- the older the better. They are getting hard to come buy in these parts. Even the twin turbo ACERT's pre SDP are snatched up in a hurry.
 
J

J spreader

New member
I gochya. That makes sense and yes simple and cheap is my preference.
Being as knew to the forums as I am can you explain IVA and SDP?
 
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pushbroom

Member
Only bottom end difference is really the crank and cylinder packs. Crank on single turbos gives it 14.8l displacement. Crank on a twin turbo gives it 15.2l displacement. c16s run a thinner liner to get 15.8l displacement
Pistons on a twin are a bit higher compression.
 
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