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Not trying to hijack but the -2 sportmaster I bought for mine does not have one on it....wonder if I need to order one??
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Originally Posted by madbouyz
(Post 4685198)
OK , I'm a bit puzzled . How do you order them and put them on ? If we are talking about the anti-ventilation plate(s) they're an integral part of the lower unit's structure and are all cast as a one piece casing when they're made. I woulda thought you either have them or you don't .
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Originally Posted by BBYSTWY
(Post 4685328)
Not trying to hijack but the -2 sportmaster I bought for mine does not have one on it....wonder if I need to order one??
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Correct it is 2" shorter....the bravo lower has the splash guard cast into the housing and the shorty does not...I guess my question is do I need to buy one of the add on ones? The lower I have is a sportmaster and not an imco
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It bolts to what really is called the ANTI VENTILATION PLATE. You want that above the prop as you do not want open space above the prop on stock sterndrives. The reason and the main purpose of the plate or an extended plate is to eliminate or reduce air being drawn from the surface into the negative pressure side of the prop blades. Thats the main reason for the ANTI VENTILATION PLATE and or the added extender plate that is bolted on from whomever. Usually a IMCO product... Also they can add in planning and reducing those times for jist of it
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I believe that if you run the drive short enough with an extension box it becomes more of a surface drive with the right prop and the plate is unnecessary. It’s my guess that’s why the Imco comes without the plate. |
^^ I agree. I have been running my cat for several years with both sportmaster and Imco lowers without a splash plate. Both Imco and Mercury call it a splash plate.
Boat comes right up on plane and runs to top speed with no issues. This is more of a surface drive application. V-bottom with a submerged drive may be affected differently. I would test without first to see how boat reacts before spending the extra money. It is easy enough to install after testing. |
Originally Posted by BUP
(Post 4685348)
It bolts to what really is called the ANTI VENTILATION PLATE. You want that above the prop as you do not want open space above the prop on stock sterndrives. The reason and the main purpose of the plate or an extended plate is to eliminate or reduce air being drawn from the surface into the negative pressure side of the prop blades. Thats the main reason for the ANTI VENTILATION PLATE and or the added extender plate that is bolted on from whomever. Usually a IMCO product... Also they can add in planning and reducing those times for jist of it
In retrospect , your reference ... You want that above the prop as you do not want open space above the prop on stock sterndrives. reminds me of the fact that on a B1 the prop is under the 'plate' but on a B3 the plate is extended to cover the rear prop. HOWEVER , exceptions abound ! On the Volvo DPS/a unit the rear prop is not covered by the plate . More useless info , eh ? haha |
Was not talking about extension boxes or surface / near surface props in the mix. .
Early Bravo 3 has an extender plate that bolted up and then later Bravo 3 the extended ANTI VENTILATION PLATE was extended as a one piece unit. Here is the early version of Bravo 3 with the bolt on extender and IT WAS NEEDED. Number 12 in the diagram and number 12 in the scrip tells what it is. And if I recall every Teague Platuim drive has the bolt on extender that I have seen in person. MerCruiser Bravo Three Gear Housing (Bravo III) Parts |
Has anyone installed anti-ventilation plates on SSMIII? I have a tough time getting out of the hole without blowing out
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