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  1. #1
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    Can humidity and heat cause slow hole shot?

    250 hpdi yamaha

    Can 85 heat and highhumidity double my hole shot time? Min typical hole shot isnabout 4-5 seconds. Today out on the water I thought i wasn’t nice gonna be able to get on plane. At full throttle my rpms were 3500 and didn’t ever notice what they were when my hole shorn was good. Do I have an engine problem and where do I start? :/

    2003 250 yamaha hpdi
    25 t1 prop 15.5

  2. Member berudd's Avatar
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    #2
    Yes.
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  3. Member vatreefarmer's Avatar
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    #3
    Some people have a summer and winter prop. Drop down a pitch when it's hot and humid. Hot air has less oxygen, and it can be very noticeable on a bassboat
    Azure AZ200 (with stuff like cupholders, bathroom and table)

  4. Member
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    #4
    Ya seemed like I wasn’t gonna be able to get on plane but eventually I did. So the rpms we’re ok and a size 24 pitch would effect me how on the high end

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    #5
    Yes it can have a big effect
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  6. Member
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    #6
    YES DROP ONE PITCH CAN HELP OR WHALE TAIL
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    #7
    Yes....I learned the hard way 15 or so years ago. Couldn’t get out of hole and couldn’t get boat on trailer without manual effort. Took my boat to shop 3 times before anyone told me about prop size and summer heat. Simple drop in prop pitch took care of problem. You may lose 1-2 mph on top end but you get it back by getting out of the hole quickly. Be aware of top end RPMs with smaller pitch.

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    #8
    Yes... big time.. living in Central Florida I can tell you our summers are like a sauna, 90% humidity. I have 2 props, a winter prop and a summer prop. Even with the lower pitch summer prop my hole shot and top end are slower then the winter months. One trick that helps in the summer is I keep the weight in the boat down as much as possible. I reduce my soft plastics, other baits and rods. I do not fill the gas tank...etc...
    Brad Krone

  9. Lead sled driver 11pounder's Avatar
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    #9
    The higher the temp the less dense the atmosphere is, the less dense the atmosphere the less oxygen there is. The higher the humidity the more water vapor in the air and the oxygen. All of this also affects top end, the less oxygen the less horse power your motor can make.

  10. Member larryhyco's Avatar
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    #10
    Absolutely and it effects about everything in life. From cars to pitching a baseball

  11. Member
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    #11
    So if I have a 25 id need a 24? And how many rpms would that change ? I want to protect the engine from over Erving obv

  12. Member
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    #12
    Quote Originally Posted by NY29T View Post
    So if I have a 25 id need a 24? And how many rpms would that change ? I want to protect the engine from over Erving obv

    air so bad motor will not rev as high in the summer heat, likely get back to where you are in the cooler months
    2022 z519 cup 225 merc 4s ser # 3B210484. 2--hds12 live units. 2 poles, atlas plate, ghost, hamby's, active target, merc digital gauges
    2002 basscat pantera 3 (dad bought new) sold 8-2-22
    2000 stratos 20 ss (bought new) 200 hp Rude ficht great boat/motor sold 11-21
    pulled by a 2500HD Denali
    proud dad of an ARMY Captain
    MAGA
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  13. Member lpugh's Avatar
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    #13
    About 200 RPM, prop it right at the edge of the limiter. Also be sure the venting is alowing you to achieve 35 to 3800 when putting it on the pad, the sooner you get to 3500 the sooner it will be up. An ideal setup usually requires you to lift just a little as it noses over with most 3 blade props and some four blades
    Last edited by lpugh; 07-07-2019 at 05:53 PM.
    Thank You Leon Pugh

  14. New England Forum Moderator twitch's Avatar
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    #14
    if I read this right you said at full throttle your rpms were 3500 that is not good, have it checked even dropping to a lower pitch isn't going to bring those rpms up to where they should be. Might help your holeshot but not full throttle
    1990 374V Ranger Still kickin' bass after all these years

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    #15
    Quote Originally Posted by NY29T View Post
    250 hpdi yamaha

    Can 85 heat and highhumidity double my hole shot time?
    You call that heat and humidity? Hell, the brand new A/C on my house can't keep up. Much less my outboard. It slows everything down, welcome to the swamp!

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    #16
    Took it out today with cooler temps got 5900 rpms at 64 mph two guys and full tackle and 3/4 gas. Maybe that’s all she’s got left in her. Getting to plane was a little better today(getting on plane was around 3500) . Not sure if should change anything . I have a small knick out of my prop maybe that doesn’t help. And I have a lot of weight in the front of the boat. Maybe that hurts getting on plane or lift?

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    #17
    64 pretty darn fast on the water

  18. New England Forum Moderator twitch's Avatar
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    #18
    sounds about right to me with that load you could always add a foil to help holeshot without changing prop but if prop needs repair that hurts also maybe after the season send it off to Mark C and have him do it up
    1990 374V Ranger Still kickin' bass after all these years

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    #19
    Quote Originally Posted by NY29T View Post
    Took it out today with cooler temps got 5900 rpms at 64 mph two guys and full tackle and 3/4 gas. Maybe that’s all she’s got left in her. Getting to plane was a little better today(getting on plane was around 3500) . Not sure if should change anything . I have a small knick out of my prop maybe that doesn’t help. And I have a lot of weight in the front of the boat. Maybe that hurts getting on plane or lift?
    you ran 5900 rpms today and maxed out at 3500 rpms a few days ago?

    I"m sorry but weather is not the cause of that.

    heat and humidity will absolutely affect engine performance on a 2 stroke, but will not hold you down to 3500rpms if your normally 5900. Unfortunately I think you have some motor issues.

    I live in south la with a heat index of 109 and have seen 2-400rpms affect in the summer but not 2k.

  20. Better Lucky Than Good! Casslaw's Avatar
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    #20
    Quote Originally Posted by bayouXpress View Post
    you ran 5900 rpms today and maxed out at 3500 rpms a few days ago?

    I"m sorry but weather is not the cause of that.

    heat and humidity will absolutely affect engine performance on a 2 stroke, but will not hold you down to 3500rpms if your normally 5900. Unfortunately I think you have some motor issues.

    I live in south la with a heat index of 109 and have seen 2-400rpms affect in the summer but not 2k.
    I believe he meant he was maxx’d at 3500 before the bow broke and the boat got on plane in the post you’re thinking about.
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