How much boost?
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How much boost?

  1. #1
    Senior Member ICDEDPPL's Avatar
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    Default How much boost?

    Since OSO has gotten really weak on tech and this site seems to have much more of it I figured I may be able to get some better info here

    Mostly my boat is a pleasure boat with occasional WOT blasts. I`d like to stay on the safe side of boost not on the edge of detonation.
    I run a F.a.s.t. wideband to keep an eye on AFR`s and i`ll be putting in a intake manifold temp gauge to keep an eye on the intake temps.

    I have a 540ci BowTie, Dart Iron 345ci heads, 651 cam, 8.3CR. non intercooled.
    This summer ran 8-71 at 6psi 4% overdriven and 11AFR at WOT.

    I picked up a set of stage 4 AIR LOC 10-71`s BDS blowers, hope to be 1:1 or underdriven with that set up.

    I`d like to run close to 7-8psi @wot , Id prefer not to blow anything up.

    Thoughts on running that boost?

    (38 Flat deck)
    Last edited by ICDEDPPL; 10-23-2013 at 07:09 PM.

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  3. #2
    Ain't Right Racin piston in the wind's Avatar
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    Quote Originally Posted by ICDEDPPL View Post
    Since OSO has gotten really weak on tech and this site seems to have much more of it I figured I may be able to get some better info here

    Mostly my boat is a pleasure boat with occasional WOT blasts. I`d like to stay on the safe side of boost not on the edge of detonation.
    I run a F.a.s.t. wideband to keep an eye on AFR`s and i`ll be putting in a intake manifold temp gauge to keep an eye on the intake temps.

    I have a 540ci BowTie, Dart Iron 345ci heads, 651 cam, 8.3CR. non intercooled.
    This summer ran 8-71 at 6psi 4% overdriven and 11AFR at WOT.

    I picked up a set of stage 4 AIR LOC 10-71`s BDS blowers, hope to be 1:1 or underdriven with that set up.

    I`d like to run close to 7-8psi @wot , Id prefer not to blow anything up.

    Thoughts on running that boost?

    (38 Flat deck)
    If you have a stage 4 I think they are clearance for alcohol. If so you Will tear the blower up on gas.
    QE 2050 W/ a Junk ass screw blower

    90% of the game is half mental... The pursuit of the unknown is priceless & gratifying . Sometimes it just takes good old fashion balls. No amount of reasoning or evaluation can deem it right or wrong. At the end of the day stick with whatever gives the person in question morning wood LOL

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    gn7
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    Like PIW said, if it really is a stage 4 blower it is set up for alky and it won't last long as a gas blower. If the stripping is worn and the blower turns freely it mind be ok.
    However, 8 psi is above the safe zone for an iron head deal. 6 is about all you can safely run with those heads.



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  6. #4
    Senior Member ICDEDPPL's Avatar
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    Interesting, when I called BDS with serial numbers to find out what they were , I was told in 1997 they were built for Richie Zul. He doesn`t build alky marine motors, and the previous owner also had em on a gas boat. I told BDS my set up they told me 7psi is ok no mention of not being able to run these on gas....
    I took them in to Dyers to be gone thru.

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    gn7
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    Quote Originally Posted by ICDEDPPL View Post
    Interesting, when I called BDS with serial numbers to find out what they were , I was told in 1997 they were built for Richie Zul. He doesn`t build alky marine motors, and the previous owner also had em on a gas boat. I told BDS my set up they told me 7psi is ok no mention of not being able to run these on gas....
    I took them in to Dyers to be gone thru.
    What BDS calls a Stage 4 Air Loc may be different than their Stage 4 with a conventional rotor. Their Stage 4 conventional rotor is a alky blower. Once Dyers went thru them, they could be what he set them up to be. The parts are the same, its the set up clearances that determine if its a alky or gas blower.
    You might get away with 7 lbs, but 8 is pushing it beyond reasonable. You asked for SAFE, and in my opinion 6 lbs is safe, 7 is edgy and 8 is asking for problems.



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    Iron heads, no intercooler, better keep it as stated above, Thats a hammer just looking for a nail.
    Especially if its a large boat did I read 38'?

  9. #7
    Senior Member ICDEDPPL's Avatar
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    6psi ... ok
    Eventually I`d like to get some intercoolers..
    This year its better blowers and head work. I`m over propped and only getting to 5300 rpm, but I love these props, (SSM drives) finally a set that gets me on plane with ease... Id like to be closer to 5700rpm. Just need to throw a bit more HP to get there.

    Shawn yes, shes an old school (`86) heavy resin bucket

    Last edited by ICDEDPPL; 10-24-2013 at 01:00 PM.

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    Senior Member Nosjunkie's Avatar
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    Quote Originally Posted by ICDEDPPL View Post
    6psi it is!
    Eventually I`d like to get some intercoolers..
    This year its better blowers and head work. I`m over propped and only getting to 5300 rpm, but I love these props, (SSM drives) finally a set that gets me on plane with ease... Id like to be closer to 5700rpm. Just need to throw a bit more HP to get there.

    Shawn yes, shes an old school (`86) heavy resin bucket

    You may want to think about switching to Alum heads if you need to do a bunch to your Iron sets. The Alum dissipates heat better so you can run a little more boost.
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    Senior Member SHAWN DAVIS's Avatar
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    Nice Cigarette, I have done some engines for a few. A Tiger, Cafe' and one Top Gun.
    Them straight bottoms and weight can be hard on engines-drives.

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    🚒🚑 +1 on the aluminum heads

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    How about a little meth injection to help with adding more boost on pump gas?

  14. #12
    Senior Member ICDEDPPL's Avatar
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    I`ve thought about the meth for sure

    As far as aluminum heads.. if I had a choice of an Iron head @ 6 psi and aluminum at 8psi I`d take the Iron head. Its my belief that in a marine application with water temps never getting over 100* and sucking in 60* lake water that the aluminum advantage isn`t so much. At 8psi that intake charge is much hotter than at 6psi so it may be a moot point
    In a car with high underhood temps and closed cooling it would make more of a difference imop.
    I could be completely wrong thou

  15. #13
    gn7
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    Iron heads on a anything retain more cylinder heat. Period. No doubt they will take more compression/boost on a boat than a street car. But they still cannot transfer as much heat as an aluminum head regardless the water temp. The heat difference between 6 and 8 psi with that blower is virtually nil. It is not MUCH hotter.
    Alum heads and a intercooler will get you to the 8 psi, AND with the intercooler, the air fuel charge in the cylinder will be more than 8 psi without the cooler. Its not about boost, its about the volume of air in the cylinder. 8 psi is not the same air/fuel charge on all engines. Its 8 psi VERSES manifold temperature.



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  16. #14
    Senior Member ICDEDPPL's Avatar
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    You`re right on the intake temp , 30-40* tops.



    Aluminum Cylinder Heads Dyno Results - Car Craft Magazine


    N/A small block not what were discussing but still a good read

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