DRTDEVL wrote:
My contractor lives in a 73 Dodge MH with a 360 and the 2245 Holley. I was wondering about that on his, too (I looked at it to see what's wrong since it quit running after the last parking, the float is stuck and flooding everything out). I would assume his has no guts uphill, whereas I can definitely hear the secondaries kick in on mine going uphill or leaving the stoplight briskly.
Just woke up and haven't read all the overnight posts yet ... so, I may be repeating things here.
The 2245 is a two barrel so no secondaries. Just two constantly "on" barrels, like the primaries in four barrel carburetors.
What you were/are hearing it the transmission downshifting into second gear.
My carburetor expert, friend, and former boss died several weeks ago after a long battle with cancer. So, I have nobody I really trust for carburetor questions. Otherwise, I fire off an email to him and maybe point him to this discussion for his thoughts and experience. He's rebuilt hundreds and his large group of gearhead friends have probably used a hundred more.
Your contractor's 2245 may be dirty or gummed up.
Likewise, the cylinder rings/walls may be worn. (Unlikely in a motorhome.) One or more compression rings may be stuck. (More likely in a motorhome.) Or, the valves may be worn, dirty, or gummed up. All of this would mean cylinder blowby.
He may have one or more "collapsed" lifters.
The distributor might be mistimed or not getting enough vacuum.
All of this, individually or collectively, would lead to loss of power. This forces the operator to apply more throttle than he/she would need to with everything in good condition and working right.
The A727 automatic transmission has a linkage to the throttle linkage. Press the throttle far enough and the transmission linkage engages, causing the transmission to downshift.
