Some said it couldn't be done - LS in a race boat
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Some said it couldn't be done - LS in a race boat

  1. #1
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    Default Some said it couldn't be done - LS in a race boat

    I thought the racers on this forum might like to follow my progress with an LS engine in a Comp Jet. I did a proof of concept installation with a 5.7l LS1 in a Baker Tunnel jet. This worked out so well that I decided to get a little more serious. I bought Lance Nicholl's Liberty Comp Jet boat (CJ 426) minus engine, and built an iron block LS engine for it. At only 436 cid the engine is a little small for this class (515 cid limit) but seems to be doing a pretty good job.

    My first time out at Puddingstone showed some promising results, but also some teething problems with maintaining enough voltage to run the computer and fuel delivery system. I shredded two alternator belts and the boat would not sustain enough battery power to run all the electronics and pumps. I was only able to run some test sessions and two heats on Saturday.

    Before Parker I reworked my alternator belt drive system to make it more reliable. At the Parker race last week end the boat ran every heat with the only issues being a small front oil seal leak and my alternator circuit breaker kept popping depriving me of alternator power again. This required me to recharge the battery before each heat. For the last race on Sunday I bypassed the circuit breaker and was able to run the full race with no electrical issues.

    In the process of learning how to drive the new boat I found that as I pushed the boat closer to the limits I learned how to spin the boat... Too much plate and too much throttle in the turn will spin the boat every time... I will have to back off the aggressiveness in the turns. Also, I have made some changes to the plate and nozzle angle that should improve the situation making the boat less sensitive to throttle and plate inputs. I am also considering a V-drive rudder system for more predictable steering control.

    So, back to the engine. Here are a few specific's: 436 cid LS truck block, hydraulic lifters, 91 oct. pump gas augmented with octane booster (up to 95 oct.). Scat crank and rods, Wiseco pistons and GM LS7 heads. GM Carb.intake manifold with a four hole throttle body and GM efi fuel injection system. Bassett racing headers from a 351 Cleveland modified with LS header flanges.

    With a little help from my Comp Jet friends I was able to make a 3rd place over all finish in an 8 boat field... I'm pretty happy with that and looking forward to the next race at Burley.
    Shirl Dickey
    CJ 60
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    Last edited by MrEracer; 04-21-2011 at 11:32 AM.

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  3. #2
    LP-25.com Infomaniac's Avatar
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    Good for you man.
    If For Some Reason I Do Something Worthy Of Recognition. God Provided The Ability And Deserves The Credit.


    QE 439 Twin Turbo

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    keep it up man, good to hear

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    what did you think of the baker i miss that thing. was it heavier then you thought? did you sell it?

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    Quote Originally Posted by SCSRIVERRAT View Post
    what did you think of the baker i miss that thing. was it heavier then you thought? did you sell it?
    The rap on that boat was that it's too heavy... Well, with the LS motor being 200# lighter than a BBC, that tunnel boat is a runner... I easily hit 76 mph (gps) with the 346 cid LS heads and cam motor (480 hp)... My plan is to build a larger LSX motor for CJ 60 and put the 436 motor in the Baker. The 436 is making over 700 hp and will make the Baker fly... Too bad it doesn't turn well or I'd run it in Comp Jet... I might sell the Baker if my wife would let me... She loves that boat and it has two seats so she drives and I get to ride...
    Shirl

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    Good Job
    #55

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    Senior Member HBjet's Avatar
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    Spinning the Liberty is very easy with any power and no center skag/fin. It sounds like your hull doesn't have a center skag/fin because if it did, you would be able to turn that boat on a dime. I had an Eliminator Liberty for many years and found how to turn one without spinning, but those turns were not tight or at a good rate of speed. What I miss the most from that hull is how fast it was over chop. A good 6" to a foot of chop and the hull responded so well.

    If you are serious about circle racing this hull, don't waist your money on a V-drive rudder system, get a center skag installed and let it rip!

    MikeF on the boards has a Liberty (Ex Race Boat) You might want to see if you can take a look at his boat. Might be hard through because he never uses it so you won't see it on the water... lol

  10. #8
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    QUOTE: Spinning the Liberty is very easy with any power and no center skag/fin. UNQUOTE:

    This boat was rigged by R&D Marine and Lance drove it to Comp Jet 'High Points Champion' in 2009. It has a center turning fin. The problem is not the boat, its the driver. I used to race a Rogers in Comp Jet many years ago and the Liberty is a little different. I need more seat time to fine tune my technique and recognize how far I can push it. Sometimes, slower is faster...
    MrE

  11. #9
    Senior Member sandeggo's Avatar
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    Quote Originally Posted by MrEracer View Post
    QUOTE: Spinning the Liberty is very easy with any power and no center skag/fin. UNQUOTE:

    This boat was rigged by R&D Marine and Lance drove it to Comp Jet 'High Points Champion' in 2009. It has a center turning fin. The problem is not the boat, its the driver. I used to race a Rogers in Comp Jet many years ago and the Liberty is a little different. I need more seat time to fine tune my technique and recognize how far I can push it. Sometimes, slower is faster...
    MrE
    Shirl,
    Good meeting you on Saturday and talking about these motors. I'm testing my carbed LS this weekend and if shes a runner I'm definitely considering nostalgia jet. Congrats on 3rd over all

  12. #10
    Driver 78CoLeBBF's Avatar
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    454 ls headed 15-1 oughta do the trick
    Its a FORD thing chevy's arent quick enough to understand

  13. #11
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    Quote Originally Posted by 78CoLeBBF View Post
    454 ls headed 15-1 oughta do the trick
    Actually, I'm looking at 14:1 on E85... I can't believe my competition is giving me advice on how to win. Thanks Jeremy, I think...
    MrE

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