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July 9, 2000


Paul C. Kermis
Simrek Corporation
137 Pacer Drive
Henrietta, New York 14467 

Dear Paul:

Sorry for the delay in getting this  information to you. We had a 1999 45' Wellcraft Excalibur with signs of serious overheated drives. We installed your Halo Drive Showers and Gaffrig Drive Temperature  Gauges. We also changed the drive oil to Amzoil Synthetic Gear Lube. We tested the boat with the Drive Shower eliminated on the starboard drive and found as follows:

Each test was run over a three mile  area. Your drive showers have solved the problem. There is no more discoloration  on the top of the drives. If I can be of any further assistance, please don't hesitate to contact me.


Dennis Lozito

* Signature removed for security purposes, and heat specs converted to gif format for website presentation.


Messages from more users with Bravo III’s running hot

July 27, 2000

Paul Kermis
Simrek Corporation
Mulitport Drive Shower Division
137 Pacer Drive
Henrietta, NY 14467

Subject: Multiport Drive Shower Halo Bravo III Test

Dear Paul:

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.

Best Regards,

(signature removed for security purposes)

John Barr
Technical Editor
Dockside Magazine

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

Copyright © 1999-2012 Simrek Corporation, 764 Eagle Point Drive, Kernersville, NC 27284   Phone: 352-729-3093
The new: “No Drill Brackets” and the new “Max Pick-up Port System” are both Protected by US Patent #7,666,042 B2, Issue Date Feb. 23, 2010. 90 Degree Pick-Up Ports US Patent number 6,241,566 Issue Date June 6, 2001.The words: “Simrek”, “Multiport Driveshower” and “Halo” are all Registered Trademarks of Simrek Corp. and may not be used anywhere in print without written permission from Simrek Corp.