Mid-Size Cats: 450Rs vs 700SCIs
01-22-2021 | 10:25 AM
#51
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Joined: Mar 2020
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From: Central Louisiana
That just blows my mind!!! Absolutely amazing!!!
01-22-2021 | 10:40 AM
#52
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Joined: Oct 2005
Posts: 289
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From: 1000 islands ny
personal opinion for everyone who has cash to buy whatever they want. but having had both, a 36supercat with 700s, and 40 roadster with 850s and then wrightperformance 360 with 400s, and new wrightperformance with 450s on the way, the move to OB's was everything i hoped it would be. no crawling around in bilge as others have said, ease of use, put way more hours per yr on 360, fuel efficiency amazing, never was worried about something blowing apart, and they always worked, always ran up to the same RPM's. remarkable what high performance boating has become.
that said, I/O's are tanks and of course ride quality is different and more stable. its just what you are willing to trade off for the fun you have.
i realize i haven't said anything new here compared to what others have said, so sorry for redundancy
that said, I/O's are tanks and of course ride quality is different and more stable. its just what you are willing to trade off for the fun you have.
i realize i haven't said anything new here compared to what others have said, so sorry for redundancy
01-23-2021 | 07:12 AM
#53
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Joined: Apr 2001
Posts: 418
Likes: 54
From: Crosslake, MN
Couple of questions regarding the topic ...
1) Has Mercury strengthened the gear case so you can run it harder and longer ? I’ve wrecked a few over the years with my 300’s.
2) At what length is outboard vs inboard an option ? Would say a 308 / 318 Skater even handle good with IO’s, or do you need a 36 footer ?
MDS
1) Has Mercury strengthened the gear case so you can run it harder and longer ? I’ve wrecked a few over the years with my 300’s.
2) At what length is outboard vs inboard an option ? Would say a 308 / 318 Skater even handle good with IO’s, or do you need a 36 footer ?
MDS
01-23-2021 | 08:03 AM
#54
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Joined: Mar 2007
Posts: 278
Likes: 79
From: Sunrise Beach, MO
Couple of questions regarding the topic ...
1) Has Mercury strengthened the gear case so you can run it harder and longer ? I’ve wrecked a few over the years with my 300’s.
2) At what length is outboard vs inboard an option ? Would say a 308 / 318 Skater even handle good with IO’s, or do you need a 36 footer ?
MDS
1) Has Mercury strengthened the gear case so you can run it harder and longer ? I’ve wrecked a few over the years with my 300’s.
2) At what length is outboard vs inboard an option ? Would say a 308 / 318 Skater even handle good with IO’s, or do you need a 36 footer ?
MDS
01-23-2021 | 09:19 PM
#56
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Joined: Oct 2007
Posts: 399
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From: New Smyrna Beach FL/ LOTO MM 21
The amount of gear surface on the new 5.44 cases Vs. the 3L stuff is tremendous. They are not bulletproof by any means but WAY stronger then the old stuff.
Joe
01-25-2021 | 06:13 AM
#57
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Joined: Feb 2007
Posts: 1,555
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From: Columbia S.C.
I knew you would make it safely Dean. Congrats again.
Mike,
I could get three years (around 300 hours) out of a set of Mercury gears in my 2.5 liters. I changed my gear oil every other outing. I had an 85 mph cruise speed, which I generally ran at in my twin setup. But..... the clock was ticking. I don't know if cryogenically treating the gears would get more time out of them. I have no experience with the 3 liters Mike. A good LU guy should be able to set you up so you can beat on them repeatedly.
Mike,
I could get three years (around 300 hours) out of a set of Mercury gears in my 2.5 liters. I changed my gear oil every other outing. I had an 85 mph cruise speed, which I generally ran at in my twin setup. But..... the clock was ticking. I don't know if cryogenically treating the gears would get more time out of them. I have no experience with the 3 liters Mike. A good LU guy should be able to set you up so you can beat on them repeatedly.
Last edited by bulletbob; 01-25-2021 at 09:16 AM.
01-25-2021 | 06:41 AM
#58
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Joined: Nov 2000
Posts: 7,213
Likes: 395
From: Merritt Is. Fl. USA
I knew you would make it safely Dean. Congrats again.
Mike,
I could get three years (around 300 hours) out of a set of Mercury gears in my 2.5 liters. I changed my gear oil every other outing. I had an 85 mph cruise speed, which I generally ran at in my twin setup. But..... the clock was ticking. I don't know if cryogenically treating the gears would get more time out of them. I have no experience with the 3 liters Mike. A good LU guy should be able to set you up so you can beat on repeatedly.
Mike,
I could get three years (around 300 hours) out of a set of Mercury gears in my 2.5 liters. I changed my gear oil every other outing. I had an 85 mph cruise speed, which I generally ran at in my twin setup. But..... the clock was ticking. I don't know if cryogenically treating the gears would get more time out of them. I have no experience with the 3 liters Mike. A good LU guy should be able to set you up so you can beat on repeatedly.
Thanks, home safe and sound and she tucked away under brand new full cover.
Dean
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01-25-2021 | 01:59 PM
#59
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Joined: Aug 2005
Posts: 1,129
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From: Point Pleasant/Demarest NJ
This I can absolutely say is incorrect.
At 4300rpm, or roughly 95-98mph, my 700 Mercs MAYBE got 1.4mpg. That is 1100 rpm short of redline
At 95-96mph, at 5000-5100rpm, my 450r motors are getting 1.9-2.1mpg. That is 1300-1400 short of redline
Video belowhttps://youtu.be/hA5PHmmJzGU
At 4300rpm, or roughly 95-98mph, my 700 Mercs MAYBE got 1.4mpg. That is 1100 rpm short of redline
At 95-96mph, at 5000-5100rpm, my 450r motors are getting 1.9-2.1mpg. That is 1300-1400 short of redline
Video belowhttps://youtu.be/hA5PHmmJzGU
