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M8 drive issues behind 1350 Q4

Old 06-08-2012, 12:32 PM
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Default 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, and are going back to the #6 for reliability. Is this true, anybody else with issues with M8s.
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Old 06-08-2012, 06:19 PM
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I thought the M8 was a beefed up version of the #6? What is the difference between the two?
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Old 06-08-2012, 07:59 PM
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Originally Posted by Precision
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.
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Old 06-08-2012, 08:14 PM
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It may have been just a price increase
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Old 06-08-2012, 09:24 PM
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The #6s make the boats faster-less drag.
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Old 06-09-2012, 09:06 AM
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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.
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Old 06-09-2012, 12:16 PM
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Originally Posted by Tantrum
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.
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Old 06-09-2012, 12:20 PM
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Originally Posted by skater40
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?
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Old 06-09-2012, 12:56 PM
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...and how long can the #6's live at 1800+ hp survive on your Skater before service or major failures?
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Old 06-09-2012, 06:32 PM
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Originally Posted by Coolerman
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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