Motor upgrades
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Motor upgrades

  1. #1
    Senior Member Sangersam's Avatar
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    Default Motor upgrades

    New to outdrives, so not sure what I can do with the motor. I have a '79 Spectra, 24 footer, it has an all stock 330 HP 454 with a TRS drive. I am going to upgrade the fuel pump to an Edelbrock unit, add an aluminum intake and Holley or Edelbrock carb. I figured while I am at it, throw on some fresh 049 heads that have had some work done to them. If I'm doing that, what size cam should I put in it? I have a new 292 hydraulic sitting here, just don't know what that (if anything) would do to this tug boat.

    Suggestions, help?

    Thanks!

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    Before you get too deep into modifications, it may be worthwhile to find out what your outdrive is rated for in terms of Hp. You can casuse reliability issues if you go too far beyond its rating. As for the cam, the first step would be to determine how you are going to use the boat and what prop you are going to run. You want to match the engine and prop charaterisitcs.

  4. #3
    Senior Member Sangersam's Avatar
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    Quote Originally Posted by fastmarlene View Post
    Before you get too deep into modifications, it may be worthwhile to find out what your outdrive is rated for in terms of Hp. You can casuse reliability issues if you go too far beyond its rating. As for the cam, the first step would be to determine how you are going to use the boat and what prop you are going to run. You want to match the engine and prop charaterisitcs.
    I've been told that these outdrives are good with horsepower, it is the tranny that I need to worry about. I have 3 different props, like I stated, I have no knowledge with outdrives, so don't know where to start.

    This big boat is going to see alot of lake use, cruising, yanking the kids on tubes. Not much else, not looking for top end, the family boat route is what I need.

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    The TRS came with two transmissions. 1. was the Borge Warner , the other was the Merc trans. The Merc Trans is the weaker of the two, but I know of many people over the years that have ran 500hp using them. The BW setup has no problem holding up to 600hp in a lite boat. I had the BW TRS setups in my Scarab, and they never gave me any hassles. That was behind some stout 468's and running hard in the ocean, which puts a ton of extra stress on everything.


    Darrell.
    San Diego.

    28ft Sportcat
    With Twins

  7. #5
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    Based on what you are saying you want to do with the boat, you can use a dual plane intake. 750-800 Cfm carb. Do not think manufacturer really matters, I would look at a brand that you are personally familiar with or has local support. If you keep the max rpm in the 5,500 range you probabably can be safe with the crank and rods you have. As for head work find someone you trust and talk about what you want from your engine. Porting can actually reduce performance and usability in the lower Rpm ranges. Rule of thumb is moving the torque range to higher Rpm resulting in higher Hp generally is achieved by loss of torque in lower Rpm range. Again, look at your prop spec's and build the engine to provide good TORQUE in those speed ranges.

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