Might have found a few more horses
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Might have found a few more horses

  1. #1
    Senior Member lbhsbz's Avatar
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    Default Might have found a few more horses

    So...got the motor back in, rewired the boat with my loaner MSD box...hit the key and it fired. cool.

    Decided, since I bought the carbs used, bolted them on, and it ran OK so I've never touched them, to dive in and see what jets I've got and where the floats are.

    I noticed that the floats were only about 3/16" or so off the bottom of the bowl when the needle was closed...that's not right. 3 out of 4 bowls, I raised the needle valve 3 or more turns before fuel came out the pisser at 7psi. LOL . Jets were OK as a starting point considering they might have fuel running through them now.

    Since the neighbors bitch about the noise a little bit, and my last MSD dist. had 20° of advance in it...I'd previously set the timing to 14° at idle and called it a day. Tonight I'd had a few beers, so fawk the neighbors...and I ran it up to 4K in the driveway....but the timing didn't move. WTF?

    Yanked the cap, the rotor has some slop in it but the springs feel real soft. Seems as if the springs are overcome as soon as the thing fires, and just pulls timing out for cranking. Cranking = 6°AFT, idling = 14° BTC. Dammit....so I set things at 36° total.

    So, now I've got fuel and another 22° of timing...it should run better...just a tad bit.

    Gawd I'm a dumbass for not checking this out properly before. Was too concerned with other stuff I guess. I'm goin for 3 digits this weekend...we'll see what happens.

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    21 Daytona Outlaw's Avatar
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    Live and learn... let us know how it runs .
    #55

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    mo balls than $cents$ IMPATIENT 1's Avatar
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    lock the dizzy and forget about it, i've never understood why people like advance in a boat. soo much nicer to know if ya set it at 36, the sob is always at 36

    Dare to be different, if it turns out great you can claim you planned it that way.

    Jetboatperformance.com

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    Senior Member bp298's Avatar
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    did you build this engine, or buy it already together??? when it ran before you advanced timing 22 degrees, how did it run??? what fuel/compression???

    couple random thoughts - if you're just going to go run it, i'd check plugs real soon after the first run, just to make sure something isn't melting.
    also, i'd check the cam gear just because i've had one go away before. some very wierd things can happen with timing while it's going away, and it can really mess up a weekend if you're not prepared for it.
    on the other hand, changing an msd box can affect timing - but i've never heard of one affecting 20-22 degrees worth... i'd still be worryin about the gear.

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    Senior Member lbhsbz's Avatar
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    Quote Originally Posted by bp298 View Post
    did you build this engine, or buy it already together??? when it ran before you advanced timing 22 degrees, how did it run??? what fuel/compression???
    i built it, timed it to 14° BTC (thought this was before the mechanical advance, but apparently it wasn't)...the boat ran decent. pulled a B impeller to 5900.

    couple random thoughts - if you're just going to go run it, i'd check plugs real soon after the first run, just to make sure something isn't melting.
    also, i'd check the cam gear just because i've had one go away before. some very wierd things can happen with timing while it's going away, and it can really mess up a weekend if you're not prepared for it.
    on the other hand, changing an msd box can affect timing - but i've never heard of one affecting 20-22 degrees worth... i'd still be worryin about the gear.
    Its a steel gear on the dist. The cam is kinda wierd...its got a cast gear on it. Timing is very steady...doesn't jump around, so I'm gonna run it and maybe check it after the weekend.

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    Senior Member lbhsbz's Avatar
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    It ran better, but like always, I was expecting a bit more.

    Before, after a couple seconds of WOT, it started to sound like shit...not like I rattled it but just wierd...didn't seem to loose any RPMS either. That problem is solved.

    Much better throttle response and much snappier. I only got another 50 rpms out of it though, but it feels quicker. I was only able to run about 10 gallons through it and the water was pretty smooth, so no GPS runs.

    We'll have 4 days to screw with it over labor day though.

  9. #7
    I'm No Expert Shaun's Avatar
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    Putting in springs so weak that it will fully advance at say 700 rpm... Thats a interesting idea for say sombody who wants to be able to start the engine easy but run locked out once started. Do people really do this?

  10. #8
    Senior Member lbhsbz's Avatar
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    Quote Originally Posted by Shaun View Post
    Putting in springs so weak that it will fully advance at say 700 rpm... Thats a interesting idea for say sombody who wants to be able to start the engine easy but run locked out once started. Do people really do this?

    After I figured it out I thought it was kinda slick.

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