July 27, 2000
Subject: Multiport Drive Shower Halo Bravo III Test
On July14th through 18th we conducted a series of tests to determine the effectiveness of the halo Drive Shower to control heat on the MerCruiser Bravo III Drive.
To assure that testing was conducted by a fair and impartial method, the drive was prepared for the test in the following manner. The drive was drained and refilled with MerCruiser high-Performance Gear Lube+ (part #29-082854A1) according to Mercury’s instructions. For all tests the drive was brought to operating temperatures above 100 degrees Fahrenheit and all trim settings were identical. Tests were conducted with tow persons aboard and 3/4 fuel load. Weather conditions were similar on both test days.
The first step was to establish a base lime temperature and consisted of a 3-mile run at 4100 rpm in both directions. The ambient temperature was 97-101 degrees and the water temperature was 87 degrees. All data was recorded using GPS, Radar and a consolidated Gear Smart analog drive temperature sensor. We recorded a high temperature of 273 degrees on the south run and 271 degrees of the north run.
After installing the Multiport Drive Shower and stabilizing the drive temperature at 100 degrees, we conducted the same protocol used in the first test. The results of the tests are as follows: On the north rum we recorded a pear temperature of 221 degrees and on the south run we recorded a peak temperature of 219 degrees.
The following day we repeated the tests and experienced similar results, reaching a peak temperature of 269 degrees without the Multiport Drive shower installed and 227 degrees with the drive shower installed. On both test protocols we experienced approximately a 47 to 52 degree reduction in drive temperature.
The vessel used in both series of tests was a 26' deep V sport boat equipped with a MerCruiser 7.4LXMPF with a Bravo III drive with a 1.81 gear ration. The vessel’s approximate weight was 4700 lbs. The ambient temperature on both days was 97-101 degrees with a water temperature of 87 degrees. Wind at the time was 10-15 mph out of the south. All tests were conducted in a north to south direction and reversed.
These tests were conducted independently and without any compensation from Simrek Corporation. Although I have taken steps to assure the accuracy of my tests, results can vary depending on the condition of the drives tested, the ambient weather and water temperatures and the condition of vessel used in the test.
Paul, I hope these test results are what you were looking for. We were absolutely pleased with the performance of the Halo Multiport drive shower. If there should be any questions, please do not hesitate to contact me.
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About Us: Simrek® Corporation specializes in
external stern drive cooling systems for your high performance or pleasure
boating needs. Composed of high-grade stainless steel, the Simrek® Multiport
Drive Shower® can add years of life to your Alpha and Bravo drives