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03-23-2022, 08:08 PM #15000 RPM
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2.5 Sportmaster to Shorty OMC Mid
Im looking to adapt my 2.5 sportmaster to work with a shorty OMC mid... Who is willing to point me in the right direction or refer me to the man who can make it happen. I know it's been done by guys on here. I searched the threads but Im not totally clear on what all needs to happen. Thanks!
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Rip028 thanked for this postInstigator liked this post
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03-24-2022, 05:03 AM #2
On to who’s and what mid??
Ive done a couple on Taylor mids w/the Merc bolt patterns for the case.
Drive shaft, shift shaft and water tube all need shortened.
Drive shaft needs cut to OMC splines.
OMC shift shafts raise/lower to shift the case.
Mercs rotate the shaft so that must be engineered.
Other than that, it’s a piece of cake
I'd rather be competitive w/junk I built in my garage than win w/stuff I bought.
I refuse to allow common sense to interfere w/my boat buying decisions.
Checkmate 16' 140 Johnson
Hydrostream 17' Vector FrankenRude I
Laser 480 (?) 21' w/GT 200
Glastron Carlson Conquest w/XP 2.6
Glastron Carlson CVX 20 w/XP 2.6
24' Sonic w/twin 250 Johnsons
24' Sonic w/twin 250 HO Johnsons
19' STV River Rocket w/FrankenRude II
Allison XR 2002 w/Frankenrude II
Hydrostream 18' V-King w/Frankenrude II
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aj06bolt12r thanked for this post
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03-24-2022, 06:42 AM #35000 RPM
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I have not seen the mid in person yet. Going to get it Friday. But I'm told its a shortened factory OMC 3.0 looper mid. I was thinking there was an adapter plate out there that could be used to get it to bolt up. Would still have to deal with the rest of the issues you mentioned. Then if using the adapter plate that would change the needed length of the drive shaft, shift shaft and water tube. Do you know of anyone who can/will cut down the Merc shaft and cut OMC splines?
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Instigator liked this post
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03-24-2022, 06:57 AM #45000 RPM
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Ill have a nice lightning 1 gearcase that fits the shorty mid but I'm not sure I want to run it on my Allison. I don't know how they do surfaced or what speed they tend to blow out. You think its worth getting that coned or should I just spend that money getting the sporty stuff adapted?
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03-24-2022, 10:39 AM #5The Historic Photo Master
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...lot less work($) using the omc l.u...
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03-24-2022, 10:44 AM #67000 RPM
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How much horsepower and how fast are you wanting to go? Sportmaster may not be the best choice.
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03-24-2022, 10:57 AM #75000 RPM
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I'm sure it would be cheaper to use the L1 OMC LU. But I'm not sure how safe it would be. How fast are they considered safe before blowout? Like the general rule for a Merc Torquemaster is something like 82-85 before they will usually blow out... What is that number for a L1 OMC case? What kind of power can they survive behind?
How much horsepower? I don't exactly have a dyno number. It's a Monty Race ported 3.0l looper with custom fuel injection and a Brucato PCU running it. Pump gas tune and heads 145psi on all six. I'd say... quite a bit.
How fast do I want to go? I'd like to run low 100's. Boat is an Allison XB 2003. It ran low 90's with my Promax before I melted #6
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03-24-2022, 11:14 AM #8
I put CLE's on V8 OMC mids, which is the same pattern as a Sportmaster. Just need an adapter plate. Jack Barsh can shorten the mid from 20" to 16", not sure if he can do anything with the bolt pattern. I believe JPEROG on here has welded up the OEM holes in OMC mids and redrilled the bottom to accept the Merc pattern without an adapter plate, so maybe contact him.
Keith-
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aj06bolt12r, rgsauger thanked for this postInstigator liked this post
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03-25-2022, 03:49 PM #9I'd rather be competitive w/junk I built in my garage than win w/stuff I bought.
I refuse to allow common sense to interfere w/my boat buying decisions.
Checkmate 16' 140 Johnson
Hydrostream 17' Vector FrankenRude I
Laser 480 (?) 21' w/GT 200
Glastron Carlson Conquest w/XP 2.6
Glastron Carlson CVX 20 w/XP 2.6
24' Sonic w/twin 250 Johnsons
24' Sonic w/twin 250 HO Johnsons
19' STV River Rocket w/FrankenRude II
Allison XR 2002 w/Frankenrude II
Hydrostream 18' V-King w/Frankenrude II
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25two.stroke liked this post
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03-25-2022, 04:02 PM #10
On the Lightning’s, they have a horrible reputation, especially w/any power put to them.
That being said, I’ve built a few, including one on a 300-ish hp 3.3 looper w/zero issues.
But…….,I only have a couple hrs on it.
The theory is, the housings flex under load, the gears go out of alignment and boom!
If your mid has OMC bolt pattern, I’ve run coned OMC cases over a 100 many,many times.
Heres your question to the nay saying experts, “if I am surfacing my case, who cares what it looks like?”.
If you dig deep enough on here, you should be able to come up w/one I did.
I added/welded a slab on the factory skeg, making it deeper and longer.
Ran low 100’s on an STV and similar on an Xr2002.
Ran it on a Hydrostream Vector at 101.
Happy to help if i interested.
If so, PM me and we’ll swap #s.
I type too slow to think it’s fun.
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aj06bolt12r thanked for this postrgsauger liked this post
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03-25-2022, 07:24 PM #115000 RPM
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Thank you Instigator I'll do that.
Matt Green. I'm interested in your adapter but your PM box is full
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Instigator liked this post
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03-26-2022, 12:59 PM #125000 RPM
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If anyone on here knows Matt Green tell him to hit me up please. 615 339 7043
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03-26-2022, 01:07 PM #137000 RPM
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aj06bolt12r - I knew someone with a very spicy Dave Bush powerhead on an XB2003 a few years back but don't recall what he ran for mid, lower, gear or props. I'm looking for his contact info but nothing yet. Will let you know...
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03-26-2022, 01:20 PM #145000 RPM
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03-26-2022, 05:54 PM #156000 RPM
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