1471 blown pump gas 548...
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1471 blown pump gas 548...

  1. #1
    steelcomp was here
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    Default 1471 blown pump gas 548...

    Finally finished up this long term project. This is a 548 for Nelson's 19' Hallet SS Vdrive. We've had a couple iterations of this engine and this one I think will stick around for a while.
    548ci, 4.53 bore x 4.25 stroke
    Dart Sportsman Gen6 block
    Scat standard weight crank, Scat 6.385 rods
    JE dished blower pistons, 8.5:1 cr
    Romac blower balancer
    Canfield 355 heads (the last pair ever made) with CNC chamber and ported with Ferrea Competition intakes and SuperAlloy exhaust, Isky RAD Tool Room springs and Ti retainers.
    T&D shaft rockers, rockers shot peened with spring oilers for endurance.
    Straub custom solid roller, GS ultra Pro lifters and Smith Brothers 7/16 x .120 wall single taper pushrods.
    Intake is from the Blower Shop and is ported to match the heads and a Superchiller that got o-ring'd on both sides.
    Littlefield 1471 blower for pump gas and a pair of 1150 Holleys prepped by AED with their Teflon coating for the marine environment.
    Pan is a big Stef's full sump, full kick out with a detailed Melling HV pump. Block also was set up with piston oilers from BLP.
    Crank trigger is from Aerospace Eng. because they were the only ones I could find with a flying magnet wheel with the 6 bolt blower pattern.
    Blower is 9% overdriven and showed 10.5# of boost and we ran 32* timing.
    Best power today was 1147 @ 7000 still climbing and 989 lbs/ft @ 5000 on 93 oct BP premium pump gas.





    Here's a vid of the last pull:

    Last edited by scott foxwell; 11-04-2016 at 05:11 PM.
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

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    That sounds like a pretty stout engine Scott. Its very much like mine, I would like to think I am getting that much power. Mine is the same bore/stroke combination with the same heads but with 270 int duration and 280 exh duration and .731 int lift and .714 exh lift. I use a 10:71 blower with 2 1050 doms. and I run 12 psi of boost at 30 deg timing on 100LL, I also have the superchiller. This is in a 21' Howard V drive. Do you think my power output would be close. Also would 32 deg of timing help.
    Last edited by VD Cruiser; 11-05-2016 at 06:36 AM.

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    Resident Ford Nut Sleeper CP's Avatar
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    Great effort

    would do great sitting infront of an MPD B+ impeller

    "Dark Sarcasm"
    Going fast is only half the fun ... what you make go
    fast is the other half.
    " A Government big enough to give you everything you want is big enough to take away everything you have"

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    steelcomp was here
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    Quote Originally Posted by VD Cruiser View Post
    That sounds like a pretty stout engine Scott. Its very much like mine, I would like to think I am getting that much power. Mine is the same bore/stroke combination with the same heads but with 270 int duration and 280 exh duration and .731 int lift and .714 exh lift. I use a 10:71 blower with 2 1050 doms. and I run 12 psi of boost at 30 deg timing on 100LL, I also have the superchiller. This is in a 21' Howard V drive. Do you think my power output would be close. Also would 32 deg of timing help.
    You have a set pf Canfield 355's? You could definitely run more timing. The plugs on this engine (NGK 8's) said we could safely run a tick more timing. That seems like a lot of cam and you're probably making peak power even higher than this engine and likely not making as much tq. Smaller heads would have made very similar power at a lower rpm and more tq. but Your engine should run really well and be very close on power.
    If God is your co-pilot, change seats!
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    steelcomp was here
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    Quote Originally Posted by Sleeper CP View Post
    Great effort

    would do great sitting infront of an MPD B+ impeller
    Thanks Jon.
    I'd have to go back and see what the observed was but it might pull more than that.
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

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    Scott, yes I have the 355 Canfields, got them straight from Canfield several years ago, they have the 125cc CNC chambers but are not ported, just blended by Canfield. The engine runs very well, but with 48% gears in the V drive and a 11 3/4 X 16 two blade it only turns 6600/6700 rpms. Do you think I should try a little less cam? I also run Lightning headers with 2" primaries. What happened to the deal where someone was going to start making the Canfields again?
    Last edited by VD Cruiser; 11-05-2016 at 04:50 PM.

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    Quote Originally Posted by VD Cruiser View Post
    Scott, yes I have the 355 Canfields, got them straight from Canfield several years ago, they have the 125cc CNC chambers but are not ported, just blended by Canfield. The engine runs very well, but with 48% gears in the V drive and a 11 3/4 X 16 two blade it only turns 6600/6700 rpms. Do you think I should try a little less cam? I also run Lightning headers with 2" primaries. What happened to the deal where someone was going to start making the Canfields again?
    If you can find some flow numbers on the heads we could look at the cam. 2" primaries might be restricting the engine some.
    The Canfield deal sort of petered out. I thought we were going to do good things with them, but the guy who was behind it just wouldn't get off the dime. I guess it's still "there", just not doing anything.
    If God is your co-pilot, change seats!
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    Thanks Scott, I'll be in touch. I'd also like to know how Nelson's boat runs with this engine, I've always liked those 19 Hallets.

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    Scott, the thing that caught my eye was the 10# of boost using 93 octane gas. What is the final compression? Thanks, TJ

    I looked at the dyno sheet and saw 8.5 to 1 compression.
    Last edited by TexasJet; 11-09-2016 at 03:26 PM.

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    Quote Originally Posted by TexasJet View Post
    Scott, the thing that caught my eye was the 10# of boost using 93 octane gas. What is the final compression? Thanks, TJ

    I looked at the dyno sheet and saw 8.5 to 1 compression.
    8.5 scr with 10# boost works out to about 14.3.
    If God is your co-pilot, change seats!
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    steelcomp was here
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    Engine is for sale.
    If God is your co-pilot, change seats!
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    What gives Scott, I thought this engine was going in Nelson's Hallet ?

  15. #13
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    Quote Originally Posted by VD Cruiser View Post
    What gives Scott, I thought this engine was going in Nelson's Hallet ?
    Everything Nelson has is for sale.
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

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