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High-Performance Outboard Lower Units | Boating Mag
https://www.boatingmag.com/boats/high-performance-outboard-lower-units/
Until recent years, there were only two options to get these features in an outboard lower unit — buy a Mercury Racing outboard fitted with a special Sport Master or Torque Master gear case, or modify the lower unit with a kit. Today, however, a number of outboard builders offer models with high-performance lower units on production models.
Outboard Lower Units and Parts - Novarossi Marine USA
https://www.novarossi.us/collections/outboard-lower-units
Filters. O.S. 21XM Version II Outboard Lower Unit Assemblies and Parts. $ 8.59. Outboard Lower Units and Parts for Novarossi 46/67 OB Engines, K&B Stock Engine. $ 5.90. Sold Out. USED O.S. 21XM Version II Outboard Lower Unit …
Outboard Lower Units | Jasper Marine Engines
https://www.jasperengines.com/lower-units
A fast and economical way to get back in the water is to install a remanufactured outboard lower unit from JASPER MARINE. Remanufactured lower units from JASPER MARINE are built to precise tolerances, are generally in stock for …
How an Outboard's Lower Unit Works | Boats.net
https://www.boats.net/blog/outboard-lower-unit-how-it-works
Outboard Lower Unit: Driveshaft How It Works: The driveshaft takes the rotational power from the engine (or powerhead) and transmits it down to the water …
Chrysler 120HP Racing Lower Unit - Outboard Paradise
https://stores.outboardparadise.com/chrysler-120hp-racing-lower-unit/
Product Description. This gear case came in on a 120HP short shaft service motor. I started the motor with a force fed water supply to the nose cone of the gear case. Seemed to function fine, no grinding , binding, etc. Driveshaft and prop shaft turn smooth. I drained the gear lube and no water or metal came out but it was grayish in color so ...
What makes for a ‘racing’ lower unit? | Antique Outboard Motor …
https://www.aomci.org/forums/topic/what-makes-for-a-racing-lower-unit/
Racing lower until are designed for the least drag. Big and rugged is a distinct disadvantage where speed is the major concern. Here is the HD gearcase used on the storm boat Motor and the gearcase for the racing 460 – When the OMC V4 was designed in the mid ’50s, It was thought it would replace twin motors on a big heavy boat.
Racing lower unit | Boating Forum - iboats Boating Forums
https://forums.iboats.com/threads/racing-lower-unit.565885/
Understand too, that porting the lower unit or venting it like the racing lower is considered a cutout and illegal (except for sanctioned racing) in most states. The two piece lower unit can be ported the same way and, of course, no welding is required. It is however an exersize in futility. The two piece lower unit is about 3 MPH slower than the one piece AND the two …
Sport Master Gearcase | Mercury Racing
https://www.mercuryracing.com/engines/r-series/gearcases/sports-master.html
The gearcase is the one component of a high-performance sterndrive or outboard that is always in the water, and thus subject to drag, an important factor in hydrodynamics. Prop School – Part 1: Introduction ... Mercury Racing announce the release of six new 4.6L V8 300R FourStroke outboard models featuring a 1.60:1 gear ratio Sport Master ...
Quick silver racing lower unit - iboats Boating Forums
https://forums.iboats.com/threads/quick-silver-racing-lower-unit.276897/
Re: Quick silver racing lower unit. The only motor that came with a Quicksilver lower unit that would fit your motor is the Mercury Mark 55H. Made from 1956 to about 1960 (depending on who you talk to), with 1956-1958 being the production years. 1959-1960 models that may have been built were low production and considered to be quite rare, more of a 'back …
Gearcase Dynamics: Getting to the Point of your Lower …
https://www.wavetowave.com/home/2019/2/13/gearcase-dynamics-getting-to-the-point-of-your-lower-unit
The Mercury Racing Sport Master design has changed over the years, and was seen in iterations of the 2.5L, 3.0L, 3.2L, and Verado R engines, as well as Bravo XR drives. 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, …
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