496HO Power Upgrades for 2700 Playcraft
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496HO Power Upgrades for 2700 Playcraft

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    FNG FinelineDave's Avatar
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    Default 496HO Power Upgrades for 2700 Playcraft

    Just bought a 2700 Playcraft with a 496HO with a Bravo3 looking to do small upgrades. Any ideas on the best bang for your buck out there? Still want to keep turnkey not a wrencher! Motor is turning between 4200 and 4600 RPM depending on weather can this motor turn over 5k with the bravo3?

    Reprogram Computer?

    Roller Rockers and Cam?

    Running 87 and still getting major soot on transom and looking to get this thing running a little cleaner with some more power. Would like to do a clean 60-65 boat is doing about 55 now on a good day which is good but seems like there is more there.

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    New here Beer:30's Avatar
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    Quote Originally Posted by FinelineDave View Post
    Just bought a 2700 Playcraft with a 496HO with a Bravo3 looking to do small upgrades. Any ideas on the best bang for your buck out there? Still want to keep turnkey not a wrencher! Motor is turning between 4200 and 4600 RPM depending on weather can this motor turn over 5k with the bravo3?

    Reprogram Computer?

    Roller Rockers and Cam?

    Running 87 and still getting major soot on transom and looking to get this thing running a little cleaner with some more power. Would like to do a clean 60-65 boat is doing about 55 now on a good day which is good but seems like there is more there.
    It already has a roller cam.

    Whipple is the only place with the software to re-program the ECM. They have the 87 and 92 octane upgraded tunes available - $800ish.

    You won't get much over your current speed with the BIII drive. Nothing is free. The BIII offers great docking/manuvering manners and excellent acceleration out of the hole. However, the negative side of that is - a bunch more drag than a BI and more parasitic power loss.

    The BIII has a wider lower unit for the planetary gear setup for the counter-rotation. Along the same line, the extra prop in the water is more drag.

    The extra gear setup and outer shaft also take more HP to drive than a standard outdrive.

    Sure, ANY extra HP/TQ will help here and there, but you would need some serious HP to get you into the 60s. Especially with a toon. If you had a stepped-V hull or a cat, each MPH extra creates more lift and less wetted area (boat in the water). With the pontoons, you don't really get extra lift with extra MPH.
    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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    FNG FinelineDave's Avatar
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    Is Whipple the only one that can reprogram?

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    Default 496ho

    dont forget the 496 drops fuel from cylinders and not dropping cylinders for is rev limilter, also if you do any upgrades you better at minimum change valve spring to dual rates since the 496 is one of only two mercs that run single valve springs.we added prochargers to a boat with dual 496 hos and we discovered all these issues, we installed crane dual springs and gold roller rockers and of course the valve covers would not fit. so new valve covers and then no where for all the coils to monut so a buch of small mods had to be fabbed up. this was a couple years ago so they may make some more advanced parts now we ran only 4-5 psi and to this date no issues. this was in a big 14000 poung cobalt with 13' beam it had bravo 3's but we kept tapping the rev limiter with the biggest props made, so we went to bravo 3 xr's wich then offer props that worked. goog luck

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    Senior Member STV_Keith's Avatar
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    There may be other options in the near future. Send me a PM if you're interested in learning about one.
    Keith-


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    FNG FinelineDave's Avatar
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    Quote Originally Posted by STV_Keith View Post
    There may be other options in the near future. Send me a PM if you're interested in learning about one.

    What kind of Options?

    What do you guys do to minimize the soot do you need to re-program the ECM for that?

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    New here Beer:30's Avatar
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    Quote Originally Posted by FinelineDave View Post
    What kind of Options?

    What do you guys do to minimize the soot do you need to re-program the ECM for that?
    If you are already running 87 octane and NO HIGHER, then you are at the MINIMUM soot level. You can put on a K&N filter and remove the turbulators in the exhaust - both of which CAN'T HURT anything. Mine soots less now with those pieces, but still quite a bit.

    Reprogramming is the only way to take out the extra fuel that is factored into the ECM.
    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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    FNG FinelineDave's Avatar
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    Thanks Beer30 for your input!

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    Senior Member kcvega's Avatar
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    I took the outer rubber flappers off my exhaust and the soot decreased a fair amount.

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    New here Beer:30's Avatar
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    Quote Originally Posted by kcvega View Post
    I took the outer rubber flappers off my exhaust and the soot decreased a fair amount.
    You can also take the top elbows off of the manifolds, take out the "turbulators" (2.5" restrictor plates) and bolt the elbows back on. No new gaskets or anything. Just use the old two gaskets on each side. Easiest 7hp ever! A little better sound and a tiny feel in power. It will reduce the soot just a tad also.
    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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