In many instances, a stock gearcase with low water pickups alone will be better for you than one with a pointy tip, which will slow you down, especially below 85 MPH. I then sanded it smooth and plan on waiting till winter to have it finished up and painted. Also, importantly, the internals were stronger, as well as offering different gear ratio options.
02-13-2006, 12:12 PM #12. pretty wild story about that iggin' bloodsuckersWalking a fine line, and enjoying the view. Business Development General inquiry. Ok I started with a used nosecone and my stock 200 gearcase. The intakes "suck" where you put them, so if in shallow water you can block the lower ones, but the top will always remain open. One of the challenges with our Project 150 Mercury four stroke is the stock gearcase doesn't have a low water pickup. I was then thinking of putting a check valve inline, then routing it into the flush hole above the cav. I turn the intake valve on, hit the switch and water gets pumped through the outboard. Been thanked: 78 times. For good reason, the Mercury Racing Sport Master is ubiquitous, and has been a mainstay in the Mercury Racing lineup for a long time. Depending on your application and engine height, the plugging of lack of lower unit low water pick up holes on the side allows clean water to enter the lower pickup holes on the nose and bottom. Ok, I'll do the same. Gearcase design is somewhat complicated, but in this article I want to talk about some key things that will help make you faster, safer, and more efficient. 1976 CobraJet Jet Boat - Outboard conversion project.
I was thinking of trying to form some tubing to pick up propwash around the torque tab on the cavitation plate. Kit comes complete with ALMAG-35 top grade casting, epoxy, hose fittings and instructions. Beyond the low water pickup, there is also the consideration of how the gearcase itself will respond to being run higher out of the water, and the faster you go, the higher it will need to be. Our forum needs members like you to contribute to the site in order to survive. The advantage the Sport Master had over earlier performance gearcases was the torpedo shape which improved high speed dynamics, water pickup design that helped with water pressure, and flow around the gearcase. When it comes to raw outboard performance and hydrodynamics, generally speaking the less engine in the water -- the faster you are going to be.
But, for those running a lighter faster hull, looking to squeeze more speed out of any stock engine, a low water pickup is a must. How much room do you have to play with? Who may need advice or guidance for their 'Stream; and we encourage members to offer their advice. As far as the screen question, do what you want but.... A few years ago I was running a 50 merc without the lower unit screen In the deep clear water of Lake of the Woods, Ontario. With a rounded parabolic nose cone, you reduce drag, with less surface area, and the the water becomes less turbulent as it goes around and reaches the prop. 02-13-2006, 05:12 PM #15. homemade pickup. Be sure and keep careful measurements of your gearcase height in order to get a baseline, and test from there. I still have it jump around about 5 PSi (down to appx 18 PSI) when going WOT over lake chop but the head temp is >. Results 1 to 15 of 26. Can be modified so that it will fit 1988 to 1991. Shallow as possible. Sometimes grass would just set the over temp alarm on until I cleared the grass. Home made low water pickup.
Has anybody tried making their own LWP? This lower unit features a different, more robust profile with 8 low water pickups on the sides and two smaller ones on the nose. I have the same motor as you only '86 it has the small gear case. BOB'S MACHINE SHOP BIG FOOT BRAVO Nose Cone Kit FACTORY INSTALLED.
Repeat process moving down if this does not fix issue. This Bravo One lower unit has LOWER DUAL WATER PICKUP. If you are buying a new boat or repowering a trusty companion, make it a one stop shop and rig that boat with a new Suzuki DF250 V-6. I used a aluminum bit in my dyegrinder to fit it as close as I could. If the upper unit does not have a matching hole, then it will need to be plugged. If you want to get really detailed, the water inlets are also important in a few ways. Model #||Application|.
My initial thought was to use the intake for a wash down hose. Now available in Shadow Black Metallic and Matte Black finish. SPEED INCREASE OVER 5 MPH ON A 150 H. Well he's dropped off the page and I've never heard of the idea moving forward so hopefully I'm not violating any promises. Your message has been sent. Overheats within minutes of start up. DRIVES, TIE BARS, TRIM RAMS, GIMBALS, EXTENSION BOXES, SURFACE DRIVES & DRIVE ACCESSORIES. One, the shape of the water inlet effects how much water pressure you will get. You can simply fill in the right most water inlet to alleviate this, in some cases. Email address (optional): A message is required. On top of that, the pointy tip is longer, increasing drag.
USP Marine Tuning Performance Lower Unit Plug Kit. Message (required): Send Message Cancel. The outboard motor manufacturers are now furnishing built in low water pick-up cones on all larger performance motors, and as a result the demand for after market low pick-up cones has fallen off dramatically. Economically priced, lightweight design, high grade cast aluminum.
Joined: Mar 25, 2009 7:31 pm. Took apart water pump and flushed all out. The pic that chinewalker has looks like only the equivalent of two holes is open. My system came about as a result of picking up sea grass on the lower unit after a decent SW blow. I want to make sure I get it right. On my skiff I have taken out all the live well plumbing. I still took it off this fall and brought it into the house. Sterndrive Replacement has a selection of Bravo 1 Lower SEI-122 (Mercruiser's Bravo One Lower Unit) that is undoubtedly at the lowest price you can find. Oct 20, 2018 9:47 pm. Once you get up and moving again the lower will flush out and be fine. If you're only experiencing a small water pressure loss, simply fill your top inlet, or add scoops, or improve the shape of the lower inlets in some cases. Rule of thumb is any engines 90 hp or smaller need the inline kit. These are ideal for elevated, semi surfacing X-dimensions. I then taped the hole and connected the hose.
1976 Pontoon - aka The Family Truckster. Do you guys have pictures of this done? So potentially someone has been down this road I'm on and can spot some errors in my system. Any negatives to tapping into the factory water pick up? The Combo cone is our most popular sport fisher model.
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