butchs18

FOUND A SET OF MACK 460 INJECTORS #736GB410M. WILL THEY WORK IN MY ENGINE?

I was hoping the 427 power upgrade without changing injectors would give my 400 a hp bump but it down graded it.

Thanks for the imformation & thanks for guys... like you... for helping owner operators like me trying to get up the hills faster. You are right on the money about the upgrade without bigger injectors installed. Had the truck to mack today,They checked the upgrade, said everything was ok just need injectors. I'll install them in a few days. I did try for thr 460 upgrade but mack said my tranny was not strong enough. check out the attachment. Thanks Butch mack 427 upgrade.pdf

I think that going back to the 400hp and then changing to the 427 injectors would give me what I need

They did the upgrade yesterday. Did not install injectors yet. Turbo # 5153m. I was hoping the 427 upgrade would give the 1560 fp of torgue back but now has less then the 400

I have a 2000 ch613. I had the Jakebrake installed by a Mack dealer. When I pulled out of the shop the Jake quit... after the oil warmed up... before I made it home. Went back to dealer and mack installed ribits in the oil holes of the rocker arms on the jake to help oil pressure, This worked untill you pulled a hill and the oil heated up. No jake going down the hill untill the oil cooled. I installed external oil line kit..$300 plus.. fixed the problem. Some guys put together their on oil lines and save $$.

Is the E-Tech Engine and the E-7 Engine the same? The tag that they put on my motor says E-7. Butch

Mack did not suggest the cam key change .... only turbo and injector change ... the turbo I already had. Sure have lost horse power. There's no way that it has 1560 foot pound of torque. The 400 that I had will outpull this 427 hands down. Thanks for your reply. Butch

Let me give you a little history about what I have done in the past two years: When I bought the truck, it was a 330/350 E-Tech Engine, so I decided to have Mack upgrade it to a 355/380 after reading post on this web site which was a big help. The upgrade gave me 1560 ft. pounds of torque at 1100 rpm's and 380 horse power at 1600 rpm's. Then, I decided to go up to the 400 horse power upgrade, which at the time I didn't realize that it would drop my torque back to 1460 ft. pounds. Later in the year, I decided to have Mack upgrade to 427 which would give me the 1560 pound of torque back. I already had the right turbo but needed the injectors that I have not installed yet. So, when I pulled my truck into the Mack shop it would produce 27 pounds of turbo boost with the 400. Now, when I took the truck out of the shop after the 427 upgrade, I only could get 22-23 pounds of boost. I was very disappointed. I haul bulk cement with my truck and gross 80,000 pounds and haul in the mountains of Tennessee. It seems like Mack punishes you every time you upgrade. What would you recommend I do next? Change injectors or put the Blixton 200 on the truck? The last six digits of my vin. # is: 123854 I appreciated any help you can give me. Thanks, Butch