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  1. 1

    248 rebuild what pistons?

    I was thinking maybe a custom intake with 4 small SU carbs. I can fabricate this fairly easily with the tools I already have available. There are some good exhaust shops here in Western Australia so tube type headers are onlya matter of the right design and lots of money. 3800 rpm is probably...
  2. 1

    Should a broken dash pot be replaced?

    Is 135cfm a typo? To calculate air flow multiply cubic inch capacity of the engine x revs at peak power and divide by 3456. 350 x 5800 ÷ 3456 = 587cfm. Adjust for volumetric efficiency (80% is a good rule of thumb number for a stock engine) and that will give you a fairly good cfm number to help...
  3. 1

    248 rebuild what pistons?

    Hi All I will soon have a shed for the first time in 12 years so i'm keen to get my Australian assembled 1946 model 40 back on the road. I want to update the 248 with some higher compression (around 8.6 should do). Does anyone have any recommendations in regards to pistons for the engine...
  4. 1

    Should a broken dash pot be replaced?

    These are referred to as an "anti stall dashpot" These are referred to as anti stall dash pots. They stop the throttle closing abruptly while engine revs are higher than a fast idle. High engine revs under a closed throttle creates a strong vacuum that sucks excessive fuel in through the idle...
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