What is the #7 Drive
 

Ok, I have only heard about these and never saw one in person.

What is the difference between the #6 and #7 drive. Do they even make them? If they make them, then why aren't they used?

Someone please fill me in?

A SSM II uper with a SSM V lower?:D
Or maybe a diesel version.

A Six Drive looks like this:
http://www.mercurymarine.com/uploads...IXRdrive_d.gif

They are quite common in high horsepower applications, but they are quite expensive.

I've never heard of a 7 drive. :confused:

Gary,
How about a IV top and a III bottom,
or visa- versa, maybe a VI with a
alpha or bravo lower ;)


No, seriously, I remember seeing an
old merc. service manual for a VII drive.

As I recall, it was a # 6 with a larger
lower unit.
Kind of like what the TR/TRS or bravo 1/2
comparison.

It was marketed for larger cruisers, etc.

jt

About the same cost you spend on donuts all year :D

I have a 1992 Merc service manual that covers SSM VI and SSM VII drives. It's up in the attic at the moment, tho, so I can't tell much more right now.

:eek: :eek: :eek:

they really make a #7?:confused:

OK Too Old, But whats the application ?

After racing for the last 4 years I just got #7 drive

7th Bravo that is
:crazy:

Too Olds # 7's !!!!

http://purrfectcatshelter.org:8080/h.../eggbeater.jpg

Gears Teflon coated!!!


http://purrfectcatshelter.org:8080/h...r/big_gear.jpg http://purrfectcatshelter.org:8080/h...xer/gears2.jpg


Counter rotating surface drives you do need stagger those props are almost touching!



http://purrfectcatshelter.org:8080/h.../mixer/top.jpg

I thought it was a Diesel Application

the #7 drive looks kinda like a #6 and is for diesel applications. there aren't too many around. I saw some on a Fountain sport cruiser at Innovation awhile back.

GLH.... LOL!! :D :D :D :D

I'm glad to see I'm not the only one with a warped sense of humor.... :D

I think the #7 drive has 1 vertical shaft, while the #6 has 2 vertical shafts in the lowers.

The #7 is a diesel drive. It has a single vertical shaft with a 6.5 inch bullet and through hub exhaust. The 6a upper is the 7 upper. The rotation was changed in the upper. It looks like a big bravo.
I saw a pair in Dubai once. I think that only 20 were made.
pat W

The number #7 is very similar to a SSM #6 except with a larger lower case and bullet. I've only ever seen one pair. They were on a 47 Fountain SC with SeaTek turbo diesels. I think it was 1997. I don't think they made too many. Looked REALLY beefy but would definitely have more drag than a #6 in a performance application.