460" vs 602" ????
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460" vs 602" ????

  1. #1
    JGB
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    Default 460" vs 602" ????

    Alright here's the deal. I have a 21' TPR pickle fork. When I bought it 3 years ago I threw in just a basic little over stock .030 454" with a Comp 280 cam, small oval port heads with a rectangle port Team G and a 1050 dominator. The intake and 1050 were all I had at the time so thats why I used it. The boat ran pretty well for the power, I would guess 350 to 400 hp. It turned 5200 rpm and GPS'd 60 mph.

    Fast forward a year, I built a 602" BBC, I wanted it to be fairly low maintance and relaible. It is 11.3/1 comp., roller cam, Bowtie heads, profiler sniper intake and a 1150 dominator. Again, I wanted a low maintance big inch engine, that I could cruise with and still build decent power. I was shooting for 750 to 800 hp. No dyno numbers just a guess. I put it in the boat with no hardware changes made. Same MSD system and same Aeromotive fuel pump/regualtor were used as with the 460". Took the boat out and it ran 90 mph. Boat picked up 30 mph with the engine swap, which I am very happy with. The problem is that the engine RPM's the same 5200.

    Why would you guess that two different engines with probally 3 or 4 hundred horse power differance would RPM the exact same without a single hardware change? It's not the tach, on the trailer with the driveshaft disconnected it will tag 7000 real quick. Im stumped, any ideas?

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    Senior Member EVILFORCE's Avatar
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    What impeller does it have?
    No Fool Like A Old Fool is there?

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    JGB
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    A/B with an inducer

    Last time out I changed the loader from a full open center to one with about a 5" blocker. I didnt GPS it but it still RPM'd 5200
    Last edited by JGB; 02-21-2011 at 10:46 AM.

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    "BEER BUDGET RACING" Bodean's Hammer's Avatar
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    Quote Originally Posted by JGB View Post
    Alright here's the deal. I have a 21' TPR pickle fork. When I bought it 3 years ago I threw in just a basic little over stock .030 454" with a Comp 280 cam, small oval port heads with a rectangle port Team G and a 1050 dominator. The intake and 1050 were all I had at the time so thats why I used it. The boat ran pretty well for the power, I would guess 350 to 400 hp. It turned 5200 rpm and GPS'd 60 mph.

    Fast forward a year, I built a 602" BBC, I wanted it to be fairly low maintance and relaible. It is 11.3/1 comp., roller cam, Bowtie heads, profiler sniper intake and a 1150 dominator. Again, I wanted a low maintance big inch engine, that I could cruise with and still build decent power. I was shooting for 750 to 800 hp. No dyno numbers just a guess. I put it in the boat with no hardware changes made. Same MSD system and same Aeromotive fuel pump/regualtor were used as with the 460". Took the boat out and it ran 90 mph. Boat picked up 30 mph with the engine swap, which I am very happy with. The problem is that the engine RPM's the same 5200.

    Why would you guess that two different engines with probally 3 or 4 hundred horse power differance would RPM the exact same without a single hardware change? It's not the tach, on the trailer with the driveshaft disconnected it will tag 7000 real quick. Im stumped, any ideas?
    thats not where the limiter is set is it?

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    JGB
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    MSD 7al with a 7500 chip
    Last edited by JGB; 02-21-2011 at 10:55 AM.

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    Senior Member Filucky's Avatar
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    Sounds like a faulty tach or signal from your 7al, the impeller will turn alot more rpm with your new motor over your old motor.

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    gn7
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    Uh, you turn EXACTLY the same RPM and yet the boat is 30 MPH faster. Thats the trick of the decade right there.



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    If I could gps my 21 deck to gps 90 at 5200 I'd be frikken STOKED

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    I'm thinking your tach is way off
    #55

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    "BOATLESS" blender over's Avatar
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    Your tach is f-up.
    IMO there is now way u r doing 90 mpg gps with a AB impeller if u r turning only 5200rpm., edit post not sure why there is a little red face at the top of my post.

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    Senior Member SlowRyd's Avatar
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    Quote Originally Posted by JGB View Post
    MSD 7al with a 7500 chip
    Id still change the chip. Earleir this year we a had a 6800 chip screw up in my brothers boat and only let it turn about 4500

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    mo balls than $cents$ IMPATIENT 1's Avatar
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    Quote Originally Posted by SlowRyd View Post
    Id still change the chip. Earleir this year we a had a 6800 chip screw up in my brothers boat and only let it turn about 4500
    it grew resistance gremlins seen that happen more than once on a boat, lil h20 makes its way into the pill , causes corrosion then adds to the resistance of the pill


    sounds like a bad tach to me too, no way it picked up that much mph without picking up a ton of rpms to boot.

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    bad tach. what brand is it?

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    Quote Originally Posted by JGB View Post
    Alright here's the deal. I have a 21' TPR pickle fork. When I bought it 3 years ago I threw in just a basic little over stock .030 454" with a Comp 280 cam, small oval port heads with a rectangle port Team G and a 1050 dominator. The intake and 1050 were all I had at the time so thats why I used it. The boat ran pretty well for the power, I would guess 350 to 400 hp. It turned 5200 rpm and GPS'd 60 mph.

    Fast forward a year, I built a 602" BBC, I wanted it to be fairly low maintance and relaible. It is 11.3/1 comp., roller cam, Bowtie heads, profiler sniper intake and a 1150 dominator. Again, I wanted a low maintance big inch engine, that I could cruise with and still build decent power. I was shooting for 750 to 800 hp. No dyno numbers just a guess. I put it in the boat with no hardware changes made. Same MSD system and same Aeromotive fuel pump/regualtor were used as with the 460". Took the boat out and it ran 90 mph. Boat picked up 30 mph with the engine swap, which I am very happy with. The problem is that the engine RPM's the same 5200.

    Why would you guess that two different engines with probally 3 or 4 hundred horse power differance would RPM the exact same without a single hardware change? It's not the tach, on the trailer with the driveshaft disconnected it will tag 7000 real quick. Im stumped, http://www.performanceboats.com/imag...biggrin.gifany ideas?
    Change the chip and the tach.It may go faster.Tommy's boats are FAST.

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