So how do you measure efficiency... more than one way to skin a cat:
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So how do you measure efficiency... more than one way to skin a cat:

  1. #1
    Resident Ford Nut Sleeper CP's Avatar
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    Question So how do you measure efficiency... more than one way to skin a cat:

    The 90 mph with 550 hp thread got me thinking about this article from 1992 about efficiency. There is more than one way to skin a cat and I always thought I would have liked to talk to Jac Sea about his idea's as stated in this article.

    Give it a read and let's hear what you think:



    It's more about set-up than pure HP. I'm still trying to get the CP more efficient it doesn't need anymore HP.

    Sleeper CP

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    mo balls than $cents$ IMPATIENT 1's Avatar
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    call him(seastrum), i talk to his son scott from time to time

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    Senior Member Widetrack's Avatar
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    Sleeper what impellor are you running? When talking with peeps and Scott, Jac son! With the HP you have you should be able to run a AA and speed should increase! Just read some of the threads that Tom Impatient 1 has posted about his experiences with impellors it will drop your RPM some! I am no guru at all. But what I have learned spin it faster doesen't mean you are pushing as much water and that is what makes it GO GO GO! LOL! WT


    SOMEONE SAID YOU CAN'T TAKE IT WITH YOU! SO,IM BURNING IT UP ONE GALLON AT A TIME!
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    Quote Originally Posted by IMPATIENT 1 View Post
    call him(seastrum), i talk to his son scott from time to time
    His thoughts on the ride plate and shoe are interesting.

    Sleeper CP

    "Dark Sarcasm"
    Going fast is only half the fun ... what you make go
    fast is the other half.
    " A Government big enough to give you everything you want is big enough to take away everything you have"

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    Quote Originally Posted by Widetrack View Post
    Sleeper what impellor are you running? When talking with peeps and Scott, Jac son! With the HP you have you should be able to run a AA and speed should increase! Just read some of the threads that Tom Impatient 1 has posted about his experiences with impellors it will drop your RPM some! I am no guru at all. But what I have learned spin it faster doesen't mean you are pushing as much water and that is what makes it GO GO GO! LOL! WT
    Been there done that year's ago. From a 9.25" AT AAA and then a AA to a Legend 9.125" AA. I've written this before and I'll write it again, the most mph per rpm I've ever had was with the AT AAA 92-93mph @ 5,200 -5,300 rpm (5,250) that's 1.76 mph per 100 rpm's (5,200).

    The current Legend 9.125" "B" cut SS (MPD) (pull's like an A+ Berkley) has run the best of 98 mph @ 6,200 that's 1.58 mph per 100 rpm's (6,200). I need to look for my info before I had Jack turn it back to the "B" cut when it was an "A" it pulled 5,700 but I forget the mph. I think it was 92 I'll look it up.

    Edit: 90 mph at 5,700 with the "A" cut @ 112* air temp (5,000 + ft) calc'd out to be 750 HP = 1.57 mph per 100 rpm.

    I'm still looking to find another impeller that will work closer to that AT AAA. at 6,200 it could push the CP to 109 mph, Now that would be efficient.

    Sleeper CP
    Last edited by Sleeper CP; 09-26-2008 at 09:41 PM.

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    Quote Originally Posted by canuck 1 View Post
    BLA BLA BLA.....first you start with a good ALUMINUM hull......
    Hey Dumbass......... I was born a poor black child and can't afford one of those baller boats. ( inside joke to the rest of you).


    Well, that didn't take long for the first tin can guy to show up.

    Okay, you run how fast with how little hp ?

    Sleeper CP

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    Senior Member sdpm's Avatar
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    Quote Originally Posted by Sleeper CP View Post
    Hey Dumbass......... I was born a poor black child and can't afford one of those baller boats. ( inside joke to the rest of you).


    Well, that didn't take long for the first tin can guy to show up.

    Sleeper CP
    Shit!! Black I'll give ya, but poor!! Not gonna happen!

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    jetboataholic HawaiianJet's Avatar
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    Quote Originally Posted by Sleeper CP View Post
    Been there done that year's ago. From a 9.25" AT AAA and then a AA to a Legend 9.125" AA. I've written this before and I'll write it again, the most mph per rpm I've ever had was with the AT AAA 92-93mph @ 5,200 -5,300 rpm (5,250) that's 1.76 mph per 100 rpm's (5,200).

    The current Legend 9.125" "B" cut SS (MPD) (pull's like an A+ Berkley) has run the best of 98 mph @ 6,200 that's 1.58 mph per 100 rpm's (6,200). I need to look for my info before I had Jack turn it back to the "B" cut when it was an "A" it pulled 5,700 but I forget the mph. I think it was 92 I'll look it up.

    I'm still looking to find another impeller that will work closer to that AT AAA. at 6,200 it could push the CP to 109 mph, Now that would be efficient.

    Sleeper CP
    I'm real nervous about posting this, cause I'm tired of getting bitched at. But what about a Hi-helix impeller? I know nothing about them, I'm just throwing it out there.


    Back to staying quiet.
    HJ

    ***FOR SALE*** 1978 19' Full Stringer Hawaiian Molokai Jet Boat w/ Berkeley 12JC-AB and Chevy 440 Tall Deck ***FOR SALE***

    Quote Originally Posted by mako shark mark View Post
    Oh yeah, Forgot to mention that the hull is a special mixture of speedcote, herculiner and rain-x, all blended together- good for another 8 mph top end.

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    Glendale Arizona Squirtcha?'s Avatar
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    Quote Originally Posted by HawaiianJet View Post
    I'm real nervous about posting this, cause I'm tired of getting bitched at.
    Back to staying quiet.
    Getting a little gun shy are we HJ?

    Although I get where he's coming from (the writer above), I don't think I'll throw away my antiquated pump hardware just yet.

    I've got a buddy that's running a stock BBF crate motor in a 18.5 Kachina. At the time he was running a dual plane intake and a Holley 500 VAC SEC carb. The boat ran gps'd 72 mph WITH NO setback, droop, shoe, rideplate etc. just a diverter and a 4 degree wedge.

    I spent a lot of money on a new motor in the same hull (18.5 Kachina) just to get even with him. After a lot of hardware, setback, shoe, rideplate, snoot and tuning etc. I managed to pass him by. I always wondered why his boat ran so good on less horsepower and no fancy hardware.

    He's since switched over to a tunnelram and a pair of 600 vac sec carbs. Predictably (stock motor) he gained nothing, but it looks cool. Still running that same 72 mph with a stock motor and pump (gotta be getting pretty worn out too).

    P.S. He's the SOB that infected me with the jetboat bug too. He's still got his boat, but rarely drives it anymore. I on the other hand, spend everything I can get my hands on to go faster faster.
    Last edited by Squirtcha?; 09-26-2008 at 06:41 PM.

  12. #10
    Senior Member fleetimus's Avatar
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    Where is page 74????

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    Quote Originally Posted by sdpm View Post
    Shit!! Black I'll give ya, but poor!! Not gonna happen!
    Now you know how many times I've walked into your shop saying " I'll kindly pay you Tuesday for a hamburger today"

    Okay, maybe not poor, but I sure in the hell don't have the money that my imagination can spend and you know I have a hell of an imagination.

    Sleeper CP

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    Senior Member sdpm's Avatar
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    You and me both Jon!

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    Quote Originally Posted by fleetimus View Post
    Where is page 74????
    I think I might have the mag someplace I'll see if I can find it. I've moved 3 times though.

    Sleeper CP

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    Quote Originally Posted by Squirtcha? View Post
    I spent a lot of money on a new motor in the same hull (18.5 Kachina) just to get even with him. After a lot of hardware, setback, shoe, rideplate, snoot and tuning etc. I managed to pass him by. I always wondered why his boat ran so good on less horsepower and no fancy hardware.

    He's since switched over to a tunnelram and a pair of 600 vac sec carbs. Predictably (stock motor) he gained nothing, but it looks cool. Still running that same 72 mph with a stock motor and pump (gotta be getting pretty worn out too).
    Dan this is the reason I started this thread after reading the other thread about the 90 mph on 550 HP boat.

    Some boats or set-ups are just better than others.

    Jac's article about running a boat without a ride plate and shoe to increase efficiency is very interesting to me.

    Sleeper CP

    Jon

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