Re: Marine Lubrication
 

So you are thinking like I am that the base oil is different between the two products?

Re: Marine Lubrication
 

Back to drive losses do to oil viscosity. On the thread "HP losses from Bravo 1X drive" a couple of interesting statements:

Steve Zuckerman reported: "This research was going on at Mercury (outboard) during the heyday of factory racing (F-1, Mod-VP). We went on to lubricants. He said this where Mercury was able to pick up discernable HP increases. He said using lightweight synthetics, with high shear strength, netted as much as 10 HP at high RPM (in this case 9000+) and reduced operaing temps considerably, which helped the small volume speedmaster live through a 50 lap circle race on an F-1."

This would be a single gear versus the double gear in an I/O drive and a lot less shafting and bearings spinning in the lube. Conversely this is higher rpm than an I/O.

Strip Poker reported: "I have a friend that drag races the 2.5's (outboards) here and all he uses is the Alisyn oil. I used it type 2 in a Imco drive, it is a lot thinner than the merc stufff.I could spin the prop by hand like a fan blade.

Steve Zuckerman reported: "I have used Merc, RP, and Alisyn. Gear wear seems the same with all three, but the boat (28" Nordic Heat with Bravo drive) is faster with the synthetics."

Articfriends reported: "I haven't compared a measured hp loss but I can tell you this summer when I was trying different surface finishes and treatments on lower bravo gears in my quest to find something that will extend there life I ran 75/140 royal purple and was never able to break 90 mph. At the end of the season in almost identical weather conditions/water temps I once again saw mid 92's after switching back to 75/90 royal purple."

What would be the best low viscosity synthetic with the high shear strength to run in a Bravo drive?

Re: Marine Lubrication
 

I have not tried Spectro yet; but get Redline from here:

http://www.247-parts.com/view_cat_su...l1=2&cat_l2=10

it's cheper here when in stock..

http://www.jscspeed.com/index.html?/univ/redline.htm

Re: Marine Lubrication
 

Thanks

Re: Marine Lubrication
 

I purchase all my Spectro products from the local Ducati shop. Ken

Re: Marine Lubrication
 

Am I saying that? I guess I am. I just can't believe that two different products with the same base oil could have such a difference in price. Ken

Re: Marine Lubrication
 

A full synthetic 75w90 if you are looking for the least amount of parasidic drag. A 75w140 for best wear.
Ken

Re: Marine Lubrication
 

Any guidance as to the full synthetic 75w90 with the best wear?

What is the viscosity rating of the Quicksilver severe duty LU oil?

Re: Marine Lubrication
 

Amsoil Severe Gear 75W-90 is a PAO...it certainly has my vote as does Royal Purple or Redline. If I knew what base M-1 is using I could perhaps include it as well.

Re: Marine Lubrication
 

Spectro's full synthetic gears oil are PAO and ester blend.
Ken