Dual Batteries
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Dual Batteries

  1. #1
    79 Sanger Picklefork Tittyman's Avatar
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    Default Dual Batteries

    My engine is 12:1 compression...always turns over slow. I know the starter is probably a little weak. That being said, if you install dual batteries and use both the start, does the motor turn over much stronger or just the same as a single battery. Or is a dual battery system only really good to have the second battery as a backup..thanks schoolin me..
    "Bill, if your gonna ride my ass that hard, at least you could pull my hair"....Hillary Clinton

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    New here Beer:30's Avatar
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    Which type of starter? Regular full-size or gear-reduction?

    I have switched to gear-reduction on everything I can get one for. Probably draws HALF of the current of a full-sized one and spins just as fast; if not faster than before.
    Quote Originally Posted by gn7 View Post
    EFI is the wave of the future. There can be no denying it. Electronics have been on the leading edge of our entire lives. Not only os the magneto dead, but the standard issue CDI is wavering. Its all about total fuel, air AND spark control. Anybody that thinks its not has their head up their ass.


    2001 SleekCraft 30' Heritage SSB, open-bow mid-cuddy. 496HO / Bravo-I.

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    Senior Member jetboatperformance's Avatar
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    I ran dual red Optimas in my flat for years , cranked like crazy on the "dual" postion , I'd crank it for oil pressure then run on one till I needed the other for back up , doing the same with my Mach1 with conventional bats and a "small pinion" reduction starter (no charging system)

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    79 Sanger Picklefork Tittyman's Avatar
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    Quote Originally Posted by Beer:30 View Post
    Which type of starter? Regular full-size or gear-reduction?

    I have switched to gear-reduction on everything I can get one for. Probably draws HALF of the current of a full-sized one and spins just as fast; if not faster than before.
    It appears to be a stock starter..turns slow. but I thought if I put dual batteries in a could solve 2 problems at once..I have to get a new battery today because the other one just died.
    "Bill, if your gonna ride my ass that hard, at least you could pull my hair"....Hillary Clinton

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    New here Beer:30's Avatar
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    Quote Originally Posted by Tittyman View Post
    It appears to be a stock starter..turns slow. but I thought if I put dual batteries in a could solve 2 problems at once..I have to get a new battery today because the other one just died.
    Get a red top or blue top Optima and be done with it for a decade. You get what you pay for.
    Quote Originally Posted by gn7 View Post
    EFI is the wave of the future. There can be no denying it. Electronics have been on the leading edge of our entire lives. Not only os the magneto dead, but the standard issue CDI is wavering. Its all about total fuel, air AND spark control. Anybody that thinks its not has their head up their ass.


    2001 SleekCraft 30' Heritage SSB, open-bow mid-cuddy. 496HO / Bravo-I.

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    Senior Member Delemorte's Avatar
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    Tom,
    Does draining those batteries that often cause you any trouble?

    Quote Originally Posted by jetboatperformance View Post
    I ran dual red Optimas in my flat for years , cranked like crazy on the "dual" postion , I'd crank it for oil pressure then run on one till I needed the other for back up , doing the same with my Mach1 with conventional bats and a "small pinion" reduction starter (no charging system)
    Quote Originally Posted by jetboatperformance View Post
    the ensueing fire would likely be extinguished by the sinking however

  9. #7
    Senior Member jetboatperformance's Avatar
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    Quote Originally Posted by Delemorte View Post
    Tom,
    Does draining those batteries that often cause you any trouble?
    Sean with that fuel tank (capacity) I never have the opportunity to run it long enough to know

  10. #8
    Senior Member GT Jets's Avatar
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    It would be a pretty safe bet that the starter end bushings are worn.

    This causes the rotor to "drag" and takes a bunch more amperage to do the same job, gear reduction starters are much better with the added torque and the permanent magnet motors are spinning at a higher rpm than an "old style" deal.

    I have taken a dual winding (High torque) starter and re bushed the ends with a torrington bearing and they kick ass, the problem is the machine work and the bearings themselves cost $40 each (it was an experiment...)

    Dual batteries creates twice the amps but it would be a short time fix IMO...

    GT
    GT


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    Put a 300 on the back of it, Flywheel it and a nosecone. $15,000 later you'll have a 65 mph pile of shit......

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    Put 2 HD 6 volt in series and double your cranking power.

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    Senior Member Delemorte's Avatar
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    Quote Originally Posted by jetboatperformance View Post
    Sean with that fuel tank (capacity) I never have the opportunity to run it long enough to know

    Thats funny...
    Quote Originally Posted by jetboatperformance View Post
    the ensueing fire would likely be extinguished by the sinking however

  13. #11
    Member bparsel's Avatar
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    My compression is the same and I run a dual battery set-up, just run them in-line and it will work great. With only 1 hooked up the boat will crank slow and it can kill the battery quickly if it's already down in charge. The duals fire it up immediately and Ive never had any charging issues etc.

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