Forum Discussion

big_cuda's avatar
big_cuda
Explorer
Sep 21, 2014

oil presure ai idle ?

hi all, I have the 97 American eagle, with 325 hp Cummins & 6 sp Allison tranny when cruising @ 50 -55 mph @ 15 -1700 rpms we are at 65-70 psi although when we come to a stop @ idle we go down to 20 psi ? any thoughts we have 101'000 miles and everything has been changed ie fluids & filters thanks
Class A
  • dons2346's avatar
    dons2346
    Explorer
    Sep 22, 2014
    A Cummins engineer told me that 10 pounds pressure at idle is more than enough.
  • WILDEBILL308's avatar
    WILDEBILL308
    Explorer II
    Sep 22, 2014
    bsinmich wrote:
    That is also part of the reason you don't let a diesel idle for long periods without a faster idle speed.

    The main reason for using the fast idle is to reduce fuel dilution of the oil because of unburnt fuel. low idle especially when the engine is not up to temp will be too cold to get full combustion of your fuel.
    Basically if you are showing over 5 psi at idle you are good.
    Bill
  • bsinmich's avatar
    bsinmich
    Explorer
    Sep 21, 2014
    That is also part of the reason you don't let a diesel idle for long periods without a faster idle speed.
  • wld1985's avatar
    wld1985
    Explorer
    Sep 21, 2014
    My Diesel truck at idle is around 20psi for oil.. Its just the way Diesel's are, they dont produce much PSI at idle.. As long as your 60 plus down the road you shoud be good..

About Motorhome Group

38,707 PostsLatest Activity: Jan 05, 2014