mercruiser trans
#3
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The real question is how good are you at throttling and how heavy is your boat? I have a friend that runs a boat with over 650hp in it. If you change over to the BW transmisions you will go slower with the same power as they eat a little more power up. They will also require you to move the engines forward. I will be puting in the area of 450+hp into my boat when I repower and I am not worried about it at all.
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#8
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If you decide to run the MercTrans, they will last a lot longer if you underprop a bit and spin the motors a little higher. Stay away from 4 blade props. If you load these trannys too hard the front pump gear will split in half
I`ve blown up more of these than I care to admit
Kurt.
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I`ve blown up more of these than I care to admit
![EEK!](/forums/images/smilies/eek.gif)
Kurt.
#9
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Join Date: Feb 2002
Location: Honeoye, NY
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FWK: Am running 548 cid in a '77 Martini 7 meter (25'). Dry hull weight w/mechanicals was origionally supposed to be about 3500#. I don't hammer it out of the hole but it flys on occasion since it does top 80 MPH (GPS) on the good condition days. Have made several upgrades since I acquired her in '82 (bow tie block, K Planes, stringer & bottom beefing, raise X-dim, transom notch, but I still think that I would weigh in at under 4K.dry. Am running a several times reworked Spinelli 4 blade 29 (probably about a real 28 now) at 53-5400 on those good days. This was all probably much more than you wanted to know. Later! --- Jer
#10
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JPC, wow, have you had any tranny problems?
I have had the MercTrans in a few boats and I got pretty good at rebuilding them
Had a 24 Superboat with a Gale Banks twin turbo big block and a 29p Mirage. I could blow the tranny every time I firewalled the throttle
but I could make it last a lot longer running a 27p
I have had the MercTrans in a few boats and I got pretty good at rebuilding them
![EEK!](/forums/images/smilies/eek.gif)
![EEK!](/forums/images/smilies/eek.gif)