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you can do that with the 6b, (359ci)if you’re trying to prove something. These engines have been used in tons of applications and there are plenty of sources for parts (other than Cummins dealers)Ĥ00hp and 1200lbft isn’t really too impressive for a 506ci engine you have dumped a ton of money into. The CTA's may have been made longer and the newer electronic versions (ISC/QSC) are stout as well. (would you drive a new Honda Accord with 35hp? - no one else would either) Mechanical CTAs were made into the mid 90s at least and that is the motor you want for sure (Bosch P7100 injection pump). If that's not enough call Scheid Diesel and open your wallet - a 700hp/ 2000 TQ motor is not far away.Ī CTA is not new tech by any means, but newer than the NHC, which is basically BCIII tech from the 70s. A very mildly built CTA will get you 400hp and 1200 TQ. There is a replacement for displacement, its called boost. Look at the drag racers and sled pullers (running those two motors) and I can promise you NONE of them are running Gale's crap. There are much better choices out there for ISB and CTA Cummins parts. Remember that the M936A2 weighs over 37,000 pounds!ĬTA motor all day every day and dont buy anything from Banks, its over priced junk. I had an M936A2 that literally forced your butt back into the seat as it shifted through the gears. With that said, I've owned some brutally strong A2s. This has much to do with the perceived lack of power with the 6CTA motor and the poor CTIS design.
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I know some guys in active service have told me they would choose a straight M939 series truck or an A1 over an A2 any day. Beyond the 6CTA 8.3 motor, the A2 has a different cab, different air-intake plumbing, some different exhaust parts, different axles, CTIS parts, and probably some other stuff that I am not thinking about. While this is true of all M939 series parts, it is even more the case with any parts that are A2 specific and the motor is one of those items.
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The parts for these trucks are not readily available. This has much to do with parts availability. While I love the 6CTA 8.3 motor, I would suggest that anyone who is interested stick with the NHC-250-powered trucks. PROS - about the same power as the NHC-250, but it is produced by a much smaller and more modern power plant, whisper quiet (for those of you who like throaty motors, this one is not the one for you.it is almost as quiet as a Duramax), turbo if you like the whistle (but it is not a whistler like an LDT-465-1 C)ĬONS - parts availability, starts better than the NHC-250 in cold weather but still needs a sniff of ether PROS - parts availability, reliability, strong motor (not necessarily stronger than the 6CTA motor, but you get your power from 855 CI's, not the turbo)ĬONS - does not like cold weather (it will always start, but you will need some ether), older design so it is not as efficient fuel-wise