merc II transmission
 

is there another name for it? I don't see many references to it -- is it similiar to the velvet drive?

what kinda HP can this tranny take???


thanks

Mark

They were caled the MercTrans. I`ve have several over the years, the weak link is the pump gear. If you hammer it hard the gear will split in half and loose pressure:eek:

My guess is about 450 hp max, maybe more if you are easy on them. They seem to last longer if you prop down a tad and spin the motors a little higher. These trannys don`t like to be strained.

Good luck,

Kurt.

Good answer!

Good answer!

MercTrans II. -- Operates like B/W Velvet Drive but weighs less than half, is about 6" shorter and far more delicate. Previous answer is totally accurate but pump parts can be upgraded by "cryo-treating". --- Jer

Re: merc II transmission
 

THis is an old thread, but I really need to ask Biggus and JPClear about recommendations on fixing a shot MerTransII or going to something else - parts are nearly non-existant, and I'd like to look at something "less delicate". I've had my 74 SRV300 for 10 years, and honestly - 90% of my mechanical issues have been tranny related. What's cryo-treating? I believe the pump failed this past weekend on my port engine and am evaluating my alternatives before jumping in....

Re: merc II transmission
 

If you have the room in front of the engine (about 6 or 7 inches) then go with the BW tranny. It will take a LOT more HP then the Merc Trans.

Jon

Re: merc II transmission
 

OK, here is what I have done just recently. I located a B/W late style 71-C for TRS(the shorter, lighter B/W) with all the goodies needed to upgrade. (bellhousing, cooler, lines, linkage, starter, coupler, etc. for less than a grand) I am sending the tranny to Tom Huber who will build it to take 900+ hp. Will install it this winter or when the MerCtrans fails; whichever comes first. This requires the space to move the engine about 5" forward but the results are a much stronger installation and a bulletproof, nice shifting drive. --- Jer

Re: merc II transmission
 

Of course, there is the question of what I'm going to do with my MerCtrans if it survives till I make the swap. I have "tricked" it with some apparent success since it's well into it's second season behind 600+ hp with no problems. But, I DO NOT PLAY COWBOY! It would probably handle 450-500 hp forever. --- Jer

Re: merc II transmission
 

according to Galen -- at http://www.speedmasters-inc.com/ -- there are plenty of parts for the merc II

He rebuilt mine last year (at the recommendation of Jo Nunez) -- turns out there are different models of the merc II tranny -- factory rating on the later models is 450hp -- without modifications.

I'm running 500hp through mine -- and while i don't hammer the stick for take off -- i other wise don't worry about my tranny. I've not had any trouble with it at all.