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#107380 - 11/28/03 12:26 AM Re: Who Uses a Drive Shower?  
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tommym Offline
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Long Island's North Shore, NY
I have never even heard of those things, what do they do and how do they work??? Thanks,Tommy


2003 Monterey 245 Cruiser,
"NEVER SATISFIED" Kings Park,NY
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#107381 - 11/28/03 01:07 PM Re: Who Uses a Drive Shower?  
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Al Offline
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Al  Offline
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Vagabond Wanderer from Mich.
Tommy, a drive shower is a simple tube device that has its pickup just under the cavitation plate on the outdrive. Through water pressure generated by the forward movement of the boat, water is forced up through the tubes, exiting through holes in the tubes at the top of the drive. Look at several of the photos posted on this thread to see the tubes.

Basically the idea is to keep the outdrive cool.

There is some claim (and disagreement whether or not it is a good idea) in keeping oil temperatures lower in the drive, but mostly the reason for drive showers is to keep the outside surface of Mercury outdrives in particular from getting so hot that they bake calcium deposits from the water onto the drive's surface. These deposits show up really good on a Mercury drive, since it is painted black. Its the white chalky substance you see just after a few hours of use.

Volvo drives, on the other hand do not suffer from this problem as much. First, I believe the design is sufficiently different that the exterior of the drive doesn't get as hot, resulting in less calcium buildup. They do get a small amount of baked on calcium, but what does appear is not as noticeable, since the drive is painted silver-grey.

This is the experience I have from owining MerCruiser Alpha 1, Volvo SX, and Volvo DP drives.


President and CEO - Napmoor and Doolittle.


2004 Mercury 270 Dinghy.
2016 Grand Design Reflection 29RS 5th Wheel
2016 GMC Sierra 2500HD SLT 6.6L Diesel

previous boats:
1995 Carver 325
1999 Four Winns 268
1999 Four Winns 225
1996 Rinker 180
#107382 - 11/28/03 02:49 PM Re: Who Uses a Drive Shower?  
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jlshields Offline
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terre haute IN
Not knocking Volvo at all, but the color of their drives could be hiding calcium build up.
My Alpha drive did show calcium deposits but my B3 does not.
$100 will buy a lot of Lime-Away.


'98 Monterey 256 '96 F150SC 351W
'FANTASEA'
#107383 - 11/28/03 03:01 PM Re: Who Uses a Drive Shower?  
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Al Offline
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Al  Offline
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Vagabond Wanderer from Mich.
For the Volvo, I think it is a combination of the color and having the exhaust routed "lower" in the unit. After all, there is a non-metallic drive shield over a portion of the drive exterior, so that would not get any baked-on deposits.

So, less deposits are baked on, and any that are, don't show as much due to the color.

Can't comment on a BIII since I have only owned Alpha and Volvo drives.

And I also found Lime-Away to be effective on the Alpha for getting rid of the deposits.


President and CEO - Napmoor and Doolittle.


2004 Mercury 270 Dinghy.
2016 Grand Design Reflection 29RS 5th Wheel
2016 GMC Sierra 2500HD SLT 6.6L Diesel

previous boats:
1995 Carver 325
1999 Four Winns 268
1999 Four Winns 225
1996 Rinker 180
#107384 - 11/28/03 03:39 PM Re: Who Uses a Drive Shower?  
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Daddy Dan Offline
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Little Rock
Considering the size and experience of Mercruiser in pleasure boating, I can't believe that their design engineers would leave this kind of known weakness in their drives over many years of production.

In the vast majority of pleasure boating use (excluding racing) I would assume the drives are well suited for the task at hand as shipped.

If a stock Merc really needs a shower for pleasure boating use, doesn't this call the quality of Merc engineering seriously into question?

DD


The Southern Insty'Toot of Towable Technology
1996 FW Horizon 200 DLX, VP 5.0 FL/SX
2004 Burb Z71
#107385 - 11/28/03 10:10 PM Re: Who Uses a Drive Shower?  
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tommym Offline
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Long Island's North Shore, NY
Thanks Vista-Al,I have never seen those calcium
deposits, I'm assuming that is a fresh water problem? Next season I will pay attention to the temp of my BIII drive. Tom \:\)


2003 Monterey 245 Cruiser,
"NEVER SATISFIED" Kings Park,NY
#107386 - 11/29/03 01:19 AM Re: Who Uses a Drive Shower?  
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Al Offline
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Al  Offline
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Vagabond Wanderer from Mich.
Daddy;

I am not sure this indicates the MerCruiser drive has a design flaw; rather, its simply a different design than the Volvo drives - one which results in calicum deposits.

This is simply a cosmetic issue as far as I can tell.


President and CEO - Napmoor and Doolittle.


2004 Mercury 270 Dinghy.
2016 Grand Design Reflection 29RS 5th Wheel
2016 GMC Sierra 2500HD SLT 6.6L Diesel

previous boats:
1995 Carver 325
1999 Four Winns 268
1999 Four Winns 225
1996 Rinker 180
#107387 - 11/29/03 03:51 AM Re: Who Uses a Drive Shower?  
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Daddy Dan Offline
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Little Rock
Al, I'm with you on that. I don't believe it's a design flaw either. I really meant to imply that putting a shower on a Merc used for pleasure boating would be unnecessary.

Wouldn't it be easier to just clean the calcium deposits off from time to time?

DD


The Southern Insty'Toot of Towable Technology
1996 FW Horizon 200 DLX, VP 5.0 FL/SX
2004 Burb Z71
#107388 - 11/29/03 10:13 AM Re: Who Uses a Drive Shower?  
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boater4life Offline
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Port of Escanaba, MI - EYC
I know Mercruiser knows of these problems but I believe that they would not sell as many parts if the drives were cooled the way they should. In addition, there really is more to cooling an outdrive than just for the calicum build up. See 14th thread from top. I have done a ton of research on this issue.


www.hurleydavits.com

Michigan's Great Lake
on the Shore of Beautiful Little Bay de Noc
#107389 - 12/01/03 04:43 PM Re: Who Uses a Drive Shower?  
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jetjack Offline
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Mystic, CT
I was just reading an article where a Boating magazine installed a Simrek Corp Summit drive shower on an alpha in the water in about 30 minutes!
They had already run the drive and got a Temp reading of the drive lube of between 218 to 241 degrees before, and 187 to 190 after the shower install.
On a Bravo drive the temp went from 273 degrees to 220 after.


1995 Donzi Sweet 16
#107390 - 12/01/03 05:56 PM Re: Who Uses a Drive Shower?  
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seabuddy Offline
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Did they mention the water and air temps in either install?

#107391 - 12/01/03 06:56 PM Re: Who Uses a Drive Shower?  
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jetjack Offline
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Mystic, CT
Both days of testing ambient temp of 97-101 degrees, water temp 85-87 degrees


1995 Donzi Sweet 16
#107392 - 12/01/03 07:26 PM Re: Who Uses a Drive Shower?  
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seabuddy Offline
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Thanks.

I wonder if the drive oils would have dropped 15 degrees cooler if the air and water temps were 15 degrees lower?

#107393 - 12/01/03 11:11 PM Re: Who Uses a Drive Shower?  
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Daddy Dan Offline
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Little Rock
Guys, I too have read the articles on the temp reduction of the drive oil when a shower is installed. I have no reason to question the data. I also understand that the guys with showers are assuming that cooler is better. Two questions:
- are the pre-shower drives operating in a normal temp range as designed by Merc?
- have there been a significant number of Merc drive failures clearly attributable to excessive oil temps?

Don't really care since I have a VP - just curious.

DD


The Southern Insty'Toot of Towable Technology
1996 FW Horizon 200 DLX, VP 5.0 FL/SX
2004 Burb Z71
#107394 - 12/02/03 03:25 AM Re: Who Uses a Drive Shower?  
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Al Offline
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Al  Offline
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Vagabond Wanderer from Mich.
Sounds as if a cooler drive will keep the drive from polluting as much?


President and CEO - Napmoor and Doolittle.


2004 Mercury 270 Dinghy.
2016 Grand Design Reflection 29RS 5th Wheel
2016 GMC Sierra 2500HD SLT 6.6L Diesel

previous boats:
1995 Carver 325
1999 Four Winns 268
1999 Four Winns 225
1996 Rinker 180
#107395 - 12/02/03 10:35 AM Re: Who Uses a Drive Shower?  
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boater4life Offline
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Port of Escanaba, MI - EYC
That's right Al. Less oil forming while reducing seal leaks.


www.hurleydavits.com

Michigan's Great Lake
on the Shore of Beautiful Little Bay de Noc
#107396 - 12/07/03 04:03 AM Re: Who Uses a Drive Shower?  
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boater4life Offline
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boater4life  Offline
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Port of Escanaba, MI - EYC
I have Bravo II & III Great Lakes Showers left in stock for $95.95. No drilling, just clamp-on, 5 minute installation. trhurley@portup.com


www.hurleydavits.com

Michigan's Great Lake
on the Shore of Beautiful Little Bay de Noc
#107397 - 12/07/03 01:11 PM Re: Who Uses a Drive Shower?  
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Keith Offline
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Indianapolis, IN.
Do you have any pics of these showers mounted? I'd like to see how they attach and what they look like installed.
I was looking into this during the summer for my B3 and think it would make a great winter project.

I am curious though as to what the recommended operating temps are for the B3 and how they compare to the Simrek test results.

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