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  1. I shoot for the 6000 to 6500 range.

    I shoot for the 6000 to 6500 range.
  2. I have raced up to the mid-6000s or so. You will...

    I have raced up to the mid-6000s or so. You will need a different pack to get rid of the limiter. Look for one that does NOT have the number 6100 printed on it.
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    Prop arrived yesterday, took the Laker 14 out to...

    Prop arrived yesterday, took the Laker 14 out to test it this morning: 55.4 mph @ 5800 rpm. Ran well into the (light) wind, but porpoised downwind unless trimmed down pretty low. Best run so far,...
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    Ron, did you send the prop?

    Ron, did you send the prop?
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    Ron, that looks great. If that's a removable hub...

    Ron, that looks great. If that's a removable hub type (looks like one), I already have the hub. Many thanks, Bob
  6. Replies
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    Mike, I'll send the prop on its way in a...

    Mike,

    I'll send the prop on its way in a couple of days, next time I make a run to town. It's awfully pretty!! Hate to see it go.
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    Ron, I just made another test run. Got 55.5...

    Ron,

    I just made another test run. Got 55.5 mph at 5940 rpm with an 11x18 Signature thru hub Sport C prop. I'm thinking that 18p is maybe as low as I want to go. Next step would be to raise the...
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    Thanks, Ron. That sounds like it would work. I...

    Thanks, Ron. That sounds like it would work. I clearly had no idea what this motor wants.

    Mike, I'll need an address.
  9. Replies
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    The hub that came with the prop is a Michigan XHS...

    The hub that came with the prop is a Michigan XHS #111 which is made for "Evinrude/Johnson 40-75HP, Small Gearcase, 1985 & newer." I'll keep that with the prop. Once I've decided what I need for my...
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    I did some testing in early July, then put it...

    I did some testing in early July, then put it aside for a couple of races. Bottom line is, this 22p prop is totally inappropriate for the Merc 700. I also tested a 21p, then one of my 18p Sport C...
  11. Thread: classes

    by Chairman
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    VP75 was created by the Twin City Powerboat...

    VP75 was created by the Twin City Powerboat Association in Minnesota, USA, in 2006 as an entry class taking advantage of older v-bottom boats and 49 cu. in. motors, both of which are plentiful and...
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    No experience with these, but downloaded this pic...

    No experience with these, but downloaded this pic from BRF a couple years ago.
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    As far as I know, all the sizes are available, so...

    As far as I know, all the sizes are available, so from 59 down to 58. I don't think there's any advantage to going up to a larger jet, unless you're not getting enough fuel where you are now. More...
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    The standard from-the-factory jet varies over the...

    The standard from-the-factory jet varies over the years. I've found slight improvement going down one size from that factory jet. Two sizes smaller and the motor falls on its face from idle, but...
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    These are the basic measurements I've taken. ...

    These are the basic measurements I've taken. Although the '70s vintage carbs are slightly smaller in some measurements, I have raced them with no noticeable ill effects.
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    We race these motors in GT Pro class in MN. To...

    We race these motors in GT Pro class in MN. To upgrade a 25, we just bolt on the big-bore carb and leave the 25 intake in place. In fact, the only test I'm aware of got slightly faster top with the...
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    Prop arrived today via UPS. Thank you so very...

    Prop arrived today via UPS. Thank you so very much, Ron. Time to redouble my efforts to get the Laker finished and on the water.

    More on the Laker 14 at:...
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    Many, many, many thanks, Ron. I'm hoping to get...

    Many, many, many thanks, Ron. I'm hoping to get the Laker 14 on the water next month, and I will report here on its performance. If you have any "Signature Propeller" graphics to offer, I'd love to...
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    1. Business is slow, money is scarce. 2....

    1. Business is slow, money is scarce.

    2. Hackensack, MN. The Dillon Laker 14, a 14' recreational tunnel boat for 60-80 hp motors. The hull is complete, waiting for spring to really arrive (it's...
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    I've made mine 20" high. If you mount the motor...

    I've made mine 20" high. If you mount the motor directly on the motorboard, that turns out to be a reasonable height. If you add a jackplate with a few inches of setback, there's room to go up...
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    My experience with small (35hp GT Pro) v-bottoms...

    My experience with small (35hp GT Pro) v-bottoms is jack it up as high as you can without losing water pressure. For a 31.8 OMC without low water pickup, that ends up with the prop shaft about 1.5"...
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    You are probably right that wing shape on these...

    You are probably right that wing shape on these slower boats has little or no effect. Though I keep trying in that direction. For a faster boat, like an F1, lift is a given due to the speed, so...
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    I started racing in 2005 with a Glen L designed...

    I started racing in 2005 with a Glen L designed Tunnel Mite. That was the only plan on the market for this sort of boat. It turned out to be ok, but with only a 24" tunnel it didn't really generate...
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    Five feet wide can't possibly be enough. You...

    Five feet wide can't possibly be enough. You will want a tunnel at least 40 inches wide and probably 14 inch sponson pads. If you want to design your own, invest in the Tunnel Boat Design Program...
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    Honeywell part number is 1TP201-7. One...

    Honeywell part number is 1TP201-7.

    One source is http://www.digikey.com/product-detail/en/1TP201-7/480-4123-ND/3072680 .

    A cheaper alternative is...
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    Racing GT Pro (OMC 32.8, 30/35hp), I've always...

    Racing GT Pro (OMC 32.8, 30/35hp), I've always had the best results running in the 6400-6800 rpm range. However, the 20hp version of this powerhead is seriously restricted at the intake, so results...
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    Try Tim's Outboard in Hackensack, MN. ...

    Try Tim's Outboard in Hackensack, MN. 218-682-2331. They have a large inventory of used parts, and they ship. Make sure the pack does NOT have "6100" printed on it -- that's the limited version.
  28. Possibly. But venturi shape is presumably...

    Possibly. But venturi shape is presumably important. And, other diameters in the throat are also smaller in the 25hp carb. I have taken the following measurements:
  29. We race the 30/35hp OMC in our GT Pro class. To...

    We race the 30/35hp OMC in our GT Pro class. To upgrade a 25 to 30/35 (the 30 and 35 are identical) we simply upgrade to the larger bore carb (at left, in the photo).

    The model year of the carb...
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    "Rapair" makes CDI modules for outboards. Look...

    "Rapair" makes CDI modules for outboards. Look them up on Google and a number of dealers will come up. Or if looking at used ones, any 2-cylinder OMC pack with connectors compatible with your...
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    If the power pack is rev limited, you will see...

    If the power pack is rev limited, you will see the number "6200" printed right on it. And if you do have one of these packs, there is no question about it when you hit that 6200 rpm.

    We race...
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    Check out...

    Check out http://www.miniboatmadness.com/index.php?option=com_content&view=featured&Itemid=101
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    That's right, which is why I said "unless you are...

    That's right, which is why I said "unless you are upgrading a 20hp." The 20 intake is very restricted.
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    For GT Pro we simply upgrade the carb and don't...

    For GT Pro we simply upgrade the carb and don't bother with the intake (unless you are upgrading a 20hp). One racer did compare intakes and got slightly better results with the 25hp intake.

    One...
  35. Don't worry about showing up solo, you will...

    Don't worry about showing up solo, you will always find the help you need. I've been doing this solo for years. If you find some guys/gals who are interested, GT Pro is an easier way to get started...
  36. A cut off capsule should be just fine. ...

    A cut off capsule should be just fine. Strangely, OPC rules call for a reinforced cockpit, gut provide no specs, or even suggestions, on what that entails. So you should be just fine. I say, get...
  37. Jeff sent me a few pictures of his Sport C boat. ...

    Jeff sent me a few pictures of his Sport C boat. Hard to tell anything specific from these, but there's nothing there to make me think this boat wouldn't work perfectly fine. The cockpit might be...
  38. Ron, You sent us some GT Pro props a few years...

    Ron,

    You sent us some GT Pro props a few years ago, and we're still using them.

    On my GT Pro v-bottoms, I run with the bullet just below the pad. Any higher and water pressure drops off...
  39. I look forward to seeing the pics. We'd love to...

    I look forward to seeing the pics. We'd love to have you join us at the races. We have 6 to 8 boats currently in Sport C and would be nice to make it 9.

    If you can't get the pictures posted,...
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    The Twin City Powerboat Assoc. started running...

    The Twin City Powerboat Assoc. started running COR races last summer here in Minnesota. Still far away for you, but a lot closer than the west coast. http://www.tcpba-racing.com/tcpba/
  41. Great story. Look forward to seeing you guys Up...

    Great story. Look forward to seeing you guys Up North again sometime.
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    Sticky: One last TCPBA race for 2012. The "Ron Baker Sr....

    One last TCPBA race for 2012. The "Ron Baker Sr. Memorial Regatta" in Forest Lake, MN, Sept 15-16.
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    You could build your own jackplate. ...

    You could build your own jackplate. http://www.dillon-racing.com/jackplate/index.htm

    You might consider using 3/8" aluminum for a motor more than about 130 lbs.
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    Sticky: We're getting ready once again to bring GT Pro to...

    We're getting ready once again to bring GT Pro to the Nationals in Kankakee. We're a little low on numbers this year, but we'll do the best we can.

    Here's a Playlist of videos from this summer...
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    Sticky: The latest GT Pro videos can be seen in this...

    The latest GT Pro videos can be seen in this YouTube playlist.http://www.youtube.com/playlist?list=PLE7C5B1098A049DF2

    Pic from Crosby, MN.
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    In Region 8, the Twin City Powerboat Association...

    In Region 8, the Twin City Powerboat Association is racing classes like this. Except that we're an OPC club rather than Stock Outboard.

    Although they don't use the latest technology, two classes...
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    Sticky: GT Pro has been invited to race with the F1 Prop...

    GT Pro has been invited to race with the F1 Prop Tour in Trenton, Michigan. F2 and Formula Light World Championships are the feature races. Also included: SLTs, junior hydros, stock outboard...
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    Sticky: Racing season is here again, and GT Pro is back...

    Racing season is here again, and GT Pro is back on the water along with the rest of the Twin City Powerboat Association. First race was Saturday June 16 in Detroit Lakes, MN. A rough day that...
  49. I tried it. I didn't read any pressure on a...

    I tried it. I didn't read any pressure on a gauge with 35psi max. I currently have a tube running to the cockpit to monitor water flow. I need about 3000 rpm to get any flow to the end of this...
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    The direct approach

    Brent tested his system and reports that it "worked great!" He says he achieved 50 mph with a 30/35 OMC on his Dillon Mini Vee.

    http://www.dillon-racing.com/customerboats/Compton/
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