Recent content by Magnum220

  1. M

    Cannot hit WOT on mercrusier 4.3

    This was my original post, which became slightly distorted as the tread progressed. I have a 1989 Thundrcraft Magnum 220 with a 4.3 Mercruiser Alpha 1 drive. It is a heavy boat at 4000 LBs When I purchased the boat it had a 14 D 19 P 3 blade Piranha (replaceable blade)prop. The boat never...
  2. M

    4,3 Mercruiser under propped ( I think)

    I have a 1989 Thundrcraft Magnum 220 with a 4.3 Mercruiser Alpha 1 drive. It is a heavy boat at 4000 LBs When I purchased the boat it had a 14 D 19 P 3 blade Piranha (replaceable blade)prop. The boat never achieved WOT with that prop. and with a load would not even plane. I changed to the spare...
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