86 Eliminator Scorpion 355 I/O Performance Questions.
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86 Eliminator Scorpion 355 I/O Performance Questions.

  1. #1
    DRQ
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    Default 86 Eliminator Scorpion 355 I/O Performance Questions.

    Hi,
    I'm new to this boat ( owned it 2 weeks n re-doing most of it now) n performance outdrive stuff but long time motorhead n have some questions before I ever even put this lil jewel in the water.
    Will premise this by saying the boat is for play on the river mostly n small lakes but being a picklefork it needs to run to it's potential.
    Currently has a 430-450HP 355 SBC w/broad power and 6400 RPM potential redline w/an Alpha 1 drive.
    1st question: Is drive height measured at rear of hull w/anti-cav plate on lower drive?
    2nd: Which plate is it? The upper (about 1.5" above) or lower (directly above prop)? Rear of hull is same height as lower plate right now.
    3rd: How fast is a reasonable speed this hull and powerplant is capable of "trimmed out w/calm water"?
    4th: What about those "widget" hydrofoils to get the tail up quicker on this type of hull as I will be pulling skiers occasionally?
    5th: Do the "foils" hurt top speed if hull is "up" at speed n the cav plate is just out of the water.
    6th: Prop suggestions? I have a 13.75/25P/3 blade Quicksilver to baseline with.
    Thx in advance
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  3. #2
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    Prop height is measured from bottom of hull to the prop shaft. With a A1, my guess 9-10".

    Alpha's produce a lot of heat, should install drive shower. If you want the A1 to live keep the rpm low 5k. Use good drive oil, Merc Hi Performance.

  4. #3
    Senior Member 77charger's Avatar
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    Alphas do not like over 5k like mentioned.

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