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  1. jarhead1086

    More Power From NHC 250 in M939 Series Trucks With Allison Transmissions

    I did not have to plug my breather holes since they did not go through into the intakes. I also checked a few old school Cummins shops and could not get copies of these pubs but I won't give up looking. I have my intercooler installed and the turbo all hooked up. I will start working on the...
  2. jarhead1086

    More Power From NHC 250 in M939 Series Trucks With Allison Transmissions

    Thanks Jakelc15. That is a long read but a lot of good pictures. Grateful to have the extra room in my 923 after seeing all that. I found the pic of that breather hole. You could poke a wire down the hole and see if it comes out in the intake or not. Sounds like there might be some of both out...
  3. jarhead1086

    More Power From NHC 250 in M939 Series Trucks With Allison Transmissions

    I found this while trying to find out how to plug the vent holes Hasbeen was talking about. 3% derate per 1000 ft elevation would explain why she was so tired at 7000 ft going through southern Utah. I remember seeing this in another post but found it in print and thought to stash it here. In...
  4. jarhead1086

    More Power From NHC 250 in M939 Series Trucks With Allison Transmissions

    I have 4 months of salty roads so she is in the garage getting worked over. Easy part is done. I have an intercooler like Bjmca (sp?)used in his conversion which simplified the hook up. Its getting powder coated (junk yard dog) and will be back in a couple weeks. Rebuild kit on order. I still...
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