Petter Acorn Top Oil Consumption.

Discussion in 'Help Wanted' started by Dan Meads, Jun 3, 2016.

  1. Dan Meads

    Dan Meads New Member

    Hi, I have a Petter Acorn top with ring oiled mains on which the oil level drops really quickly. I know that the governor side bearing feeds the big end via the scroll groove and has the oiler to keep it topped up but the oil disappears at such a rate that I am worried that I will ruin the bearings if I run it at 16 drops per minute. With the crankcase drained and the engine running oil is soon coming out at 54 DPM. I have been advised that I am overfeeding it with oil and shouldn't worry but I just do not want to run my bearings!

    [​IMG]

    Also I thought that these engines were rated at 1/2 or 2 hp. This one is rated at 3 hp, is that right?

    Many thanks Dan.
     
  2. Victoria

    Victoria Member

    Dan,
    16 drops per min is correct, you are currently running with far too much oil and the engine is not even on a load.

    Eric
     
  3. petternut

    petternut Administrator

    Dan
    The later lids say refill on first start only. Once it's emptied then the dripper set at the right rate supplies all it needs. If you keep filling the well it'll keep emptying it. set it to 16 drops and it will be fine. The 1923 model should be run with the tap closed except for draining.
    All the settings, and descriptions of the oiling systems are on my webpage which has moved to here; http://www.internalfire.com/petter-arch ... /index.php

    hth
    Roland - back from hols
     
  4. petternut

    petternut Administrator

    I should add that it would be helpful to now drain the crankcase and especially the exhaust pot. The latter may well be full up to the port!

    cheers
    Roland
     
  5. Dan Meads

    Dan Meads New Member

    Thank you Roland. I had wrongly assumed that there should always be oil visible in the filler hole. I will run it again and report back.


    Many thanks Dan.
     
  6. petternut

    petternut Administrator

    Dan
    I missed your other question. They were supplied in various ratings between 3/4 and 2 hp. If you post the serial I'll look it up and index it for you. Oil Wells had sliding lids up to 1930 then screw caps 1930-1932. and no lids required with the advent of the Calibrater models in 1932. Does yours have threads in the holes? Many earlier models had lids fitted on post-1930 rebuilds.

    cheers
    Roland
     
  7. Dan Meads

    Dan Meads New Member

    Hi Roland, my engine does not have threads in the oil well holes, they are rough cast.
    Here is the plate..

    [​IMG]

    It looks like the plate has been fitted for a long time judging by the rivets.
    Dan.
     
  8. petternut

    petternut Administrator

    A 1 1/2 hp VZU sent to Beak & Maggs of Lydford on Fosse on 25/08/1930 and the build shown in your pic is entirely consistent with those details. Not the first incorrect plate/stamping I've seen. The evidence suggest that selection and stamping of the plate was an apprentice task.
    I'll index the IF archive records tomorrow.

    hth
    Roland
     
  9. Victoria

    Victoria Member

    Interesting! My father bought his first car, a white 1936 Triumph Dolomite 2 litre from Beak and Maggs' garage at Lydford Cross Keys, Somerset in about 1949. It was laid up during WW2 but still had all the chrome painted over in white when he got it, by which time Mr Beak had passed away. Roland, you have got me reminiscing!!
    Eric
     
  10. Dan Meads

    Dan Meads New Member

    That is nice, it is mad that it has had the wrong plate fitted all these years, moreover I am really pleased that someone hasn't just fitted one that they had laying around.

    Many thanks Dan.
     

Share This Page