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Thread: AFTER MARKET EXHAUST or NOT?

  1. #11
    Racing Ray
    .
    [This message has been edited by Racing Ray (edited March 12, 2002).]

  2. #12
    Maverick
    Friend of mine, had the same experience with some Stainless Marine exhaust. Next, however, he did head work and enlarged the carb jets, and saw BIG GAINS.
    Seems like stock is ok with stock. If you want more just doing one end of the motor or the other isn't going to change with equation much without changing fuel in, head work AND exhaust.
    Just another boater, who hasn't cut loose with the bills for new exhaust....
    Originally posted by boatnam2:
    i think on a hp 500 and above you would see good results.but the guy who bought my 21ft ultra 350 mag put on powerflows and seen no gain.

  3. #13
    Tinkerboater
    Unless you change your prop to a bigger pitch your speed will be the same at any given cruise rpm. What will change by adding more torque will be your top speed not your cruise speed. Increasing torque will alow the motor to turn the original prop to a higher rpm = more speed. But at say 3000 rpm with a given prop increasing torque without increasing the rpm (cruise speed) you will not gain any speed. I used to turn 23 mirage at 3500 rpm at 47mph I increased my hp from 385 to about 600 and changed my props to 26 bravo 4 blades. I now cruise at 53 mph at 3500 rpm. More torque alows me to turn the bigger prop. but without changing the prop I still would have been going 47 at 3500 rpm.

  4. #14
    Racing Ray
    .
    [This message has been edited by Racing Ray (edited March 12, 2002).]

  5. #15
    Tinkerboater
    RR Your forgiven - we all make mistakes. You sound like you know what you are talking about I just wanted to make sure no one else got mixed up. Thanks

  6. #16
    Racing Ray
    .
    [This message has been edited by Racing Ray (edited March 12, 2002).]

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