Blower as a bolt on?
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Blower as a bolt on?

  1. #1
    Senior Member fastnlight's Avatar
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    Default Blower as a bolt on?

    I have a 22 Daytona with a 509, single carb, iron heads, HEI ignition, runs on 91 pump gas(not sure exactly what compression is), full roller, Bravo One outdrive with dual hydraulic steering. I have an 8-71 Blower Shop blower with all the pully's, etc. that I am considering adding to this motor. At a minimum I realize I need to upgrade the ignition, along with two large carbs. I really dont' want to tear this motor all the way down, it doesn't have that many hours on it. What should my considerations be? Is this a good idea? What can I do to make this work, if at all? Any input would be greatly appreciated. Thanks

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    Senior Member ONE-A-DAY's Avatar
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    Usually going with forged Pistons for a blower motor is the norm

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    There are several factors to consider, but you really need to find out what the compression you have might be.
    A camshaft change is probably in order for best results, but the cam you have may be OK You just need to find out what you have and talk to someone who knows.

    Forged pistons is a good idea, but if you don't push it too hard, most quality pistons will work.
    Good Luck

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    Highaboosta Unchained's Avatar
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    Lots of friends with 22' - 28' I/O boats.
    The Bravo outdrive will break on you immediately.
    Throw 10 k - 15k at a better outdrive and it may last a couple seasons between breakdowns.
    EVERYONE I know who runs a modified motor breaks the outdrive.
    Everyone I know who owns an I/O boat has a spare outdrive or two.
    The amount of money they put into outdrives is staggering.

    Took a road trip to Texas last March with a friend who bought a 25 Daytona with an IMCO outdrive that the owner bought to replace the Bravo outdrive.
    The motor was stock except for a tiny whipple blower that made about 3# boost.
    The boat ran 85 mph.
    The outdrive broke while we were on the test drive.
    Chewed up the bottom gears good and the case had a big dent where the gears tried to come through from the inside.

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    Quote Originally Posted by Trigger View Post
    No one cares about your buddies old antiquated garden hose technology.
    Quote Originally Posted by MAXIMUS View Post
    I think I could run more boost but it's a real hand full right now

  7. #5
    Senior Member fastnlight's Avatar
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    Quote Originally Posted by Unchained View Post
    Lots of friends with 22' - 28' I/O boats.
    The Bravo outdrive will break on you immediately.
    Throw 10 k - 15k at a better outdrive and it may last a couple seasons between breakdowns.
    EVERYONE I know who runs a modified motor breaks the outdrive.
    Everyone I know who owns an I/O boat has a spare outdrive or two.
    The amount of money they put into outdrives is staggering.

    Took a road trip to Texas last March with a friend who bought a 25 Daytona with an IMCO outdrive that the owner bought to replace the Bravo outdrive.
    The motor was stock except for a tiny whipple blower that made about 3# boost.
    The boat ran 85 mph.
    The outdrive broke while we were on the test drive.
    Chewed up the bottom gears good and the case had a big dent where the gears tried to come through from the inside.
    Ouch! If that's the case then I'll stick with my 850 Demon and be happy with the the 75 it runs now


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    Senior Member tigertooth's Avatar
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    Boy. That sounds encouraging. I know several people with little 177 weind blowers and Bravo drives whos rigs have run for years and years and are still running. From what I have heard thru the grapevine they make maybe 3-4 lbs. Of boost also.

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    Adding to the information UNCHAINED posted, there was a mention of adding two big carburetors.
    If that's done, the idle RPM will almost certainly be increased, and with many outdrives they destroy themselves when getting shifted into gear from the shock of higher RPM.

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    The member 1bdhondo's Avatar
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    Jimsplace, if you set them up with some
    Surge to them you can shift them into gear on the down side (rpm) of the surge they go into gear nice and easy. To say that the out drives can't take blower power is way to general it all depends how you drive and shift them. Sounds like he has a mild motor that would have to be run on low boost in that case he might be fine.

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    The member 1bdhondo's Avatar
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    Quote Originally Posted by tigertooth View Post
    Boy. That sounds encouraging. I know several people with little 177 weind blowers and Bravo drives whos rigs have run for years and years and are still running. From what I have heard thru the grapevine they make maybe 3-4 lbs. Of boost also.
    These guys are out of control .... The outdrive won't last a test weekend bla bla bla ..... Must be true sure never see outdrive boats with blowers :joy::joy::joy:

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    Quote Originally Posted by 1bdhondo View Post
    Jimsplace, if you set them up with some
    Surge to them you can shift them into gear on the down side (rpm) of the surge they go into gear nice and easy. To say that the out drives can't take blower power is way to general it all depends how you drive and shift them. Sounds like he has a mild motor that would have to be run on low boost in that case he might be fine.
    Certainly there are outdrives that can take huge horsepower and higher RPM, I agree. Using a transmission similar to a Velvet drive is one way of getting away from destroying the drive and not jumping waves helps.
    You're correct about my post not being specific, it was based on the more common outdrives.
    I don't know a lot about outdrives other than their obvious convenience factors.

    I guess blower surge could be used to drop it gear, but I have a strong aversion to blower surge.
    For me blower surge is an indication of an engine that could use some tuning.
    I've spent a lot of time with my carburetors to get the surge out, but I have friends that have mild engines that intentionally put it in, they love it.

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    Urban Cougar Trapper Gopher711's Avatar
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    I would do it , but on a conservative level .......keep boost to 4-6 # depending on if you have cast or forged pistons and static compression ratio > use good fuel ...detonation will kill your pistons ..... What size carb you have now ? idle should be kept to same as you are running now ...you dont need to change cams ! The blower is your friend , it will run good enough with cam you got for what your trying to do ....maybe pick up a matching carb and run with it ....you got the expensive stuff pretty much covered already
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    Senior Member fastnlight's Avatar
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    Quote Originally Posted by Gopher711 View Post
    I would do it , but on a conservative level .......keep boost to 4-6 # depending on if you have cast or forged pistons and static compression ratio > use good fuel ...detonation will kill your pistons ..... What size carb you have now ? idle should be kept to same as you are running now ...you dont need to change cams ! The blower is your friend , it will run good enough with cam you got for what your trying to do ....maybe pick up a matching carb and run with it ....you got the expensive stuff pretty much covered already
    Yes, I was planning on keeping boost low. What about adding a chiller? I know they're expensive though, but will help with detonation, especially since I'm not sure what the compression ratio is.
    I may even have XR gears in the out drive. I haven't checked. It does have an IMCO upper on the drive as well.
    I like the idea of finding a matching carb.


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    Urban Cougar Trapper Gopher711's Avatar
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    a chiller would help , especially if you do alot of steady cruising ...But at low boost levels you shouldnt really be beating up the air by stacking and heating up intake charge .......but only thing that would stop me from considering the blower at all is IF you have CAST Pistons ? You really need to find this out first ..
    Last edited by Gopher711; 02-10-2016 at 11:07 AM.
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    Highaboosta Unchained's Avatar
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    Quote Originally Posted by 1bdhondo View Post
    it all depends on "if" you drive and shift them. .
    Fixed it fer ya

    Twin Turbo 1800 HP V-Drive lake boat

    http://s621.photobucket.com/albums/t...t=MAH05771.mp4

    Quote Originally Posted by Trigger View Post
    No one cares about your buddies old antiquated garden hose technology.
    Quote Originally Posted by MAXIMUS View Post
    I think I could run more boost but it's a real hand full right now

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