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-   General Boating Discussion (https://www.offshoreonly.com/forums/general-boating-discussion-51/)
-   -   M8 drive issues behind 1350 Q4 (https://www.offshoreonly.com/forums/general-boating-discussion/278237-m8-drive-issues-behind-1350-q4.html)

B38 06-08-2012 12:32 PM
M8 drive issues behind 1350 Q4
 
Merc M8 drives not standing up to the HP of the 1350 Q4, heard merc is having issues with M8s:eekdrop:, and are going back to the #6 for reliability. Is this true, anybody else with issues with M8s.

Precision 06-08-2012 06:19 PM
I thought the M8 was a beefed up version of the #6? What is the difference between the two?

Comanche3Six 06-08-2012 07:59 PM
1 Attachment(s)
Originally Posted by Precision (Post 3705700)
I thought the M8 was a beefed up version of the #6? What is the difference between the two?
I believe a 35% strength increase.

fastdonzi 06-08-2012 08:14 PM
It may have been just a price increase :)

skater40 06-08-2012 09:24 PM
The #6s make the boats faster-less drag.

Tantrum 06-09-2012 09:06 AM
The 6 is not rated for 1350hp so it wouldn't be Mercury doing this and the 1350 is sold as a motor/drive package. Im not positive whats avail today but the M8 has / had(?) limited gearing options. Some guys went back to the 6's for gear ratio selection.

skater40 06-09-2012 12:16 PM
Originally Posted by Tantrum (Post 3705915)
The 6 is not rated for 1350hp so it wouldn't be Mercury doing this and the 1350 is sold as a motor/drive package. Im not positive whats avail today but the M8 has / had(?) limited gearing options. Some guys went back to the 6's for gear ratio selection.
The gear ratios they offer are intended to keep the speeds down.They do have a new ratio for the M8 taller than the current 1.30 and 1.43.
As to the #6 horsepower ratings-i am living proof that they do live at 1800 plus.Several M8 owners have switched back to the #6 and gained substancial top end numbers thru lower slip.

Coolerman 06-09-2012 12:20 PM
Originally Posted by skater40 (Post 3705987)
The gear ratios they offer are intended to keep the speeds down.They do have a new ratio for the M8 taller than the current 1.30 and 1.43.
As to the #6 horsepower ratings-i am living proof that they do live at 1800 plus.Several M8 owners have switched back to the #6 and gained substancial top end numbers thru lower slip.
Gary, what type of oil do you run in your #6's?

speicher lane 06-09-2012 12:56 PM
...and how long can the #6's live at 1800+ hp survive on your Skater before service or major failures?

skater40 06-09-2012 06:32 PM
Originally Posted by Coolerman (Post 3705989)
Gary, what type of oil do you run in your #6's?
Amsoil synthetic 10w-40w motorcycle oil that Bob Teaque turned me on to.


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