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IMCO -2 vs Merc Sportmaster -2

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IMCO -2 vs Merc Sportmaster -2

Old 08-04-2022, 12:58 PM
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Default IMCO -2 vs Merc Sportmaster -2

I'm thinking of trying a -2 lower on my XR to get a couple mph. I have access to both the IMCO and Sportmaster. Is there any reason to try one over the other? Durability or speed benefits to one over the other? Under 600hp.

Thanks.

Last edited by DRAG; 08-04-2022 at 05:30 PM.
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Old 08-04-2022, 01:20 PM
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Old 08-04-2022, 02:22 PM
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some say 80+ I dont think you'll see any speed difference, I run IMCO's some say increased water pressure but I dont see it, I like the look over the sporty, but it does have a longer skeg and more of a snub nose than the crescent look of the IMCO, just my 2 cents
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Old 08-04-2022, 02:25 PM
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I hope you have better luck than me finding a good IMCO -2. All I ended up with was empty focking words after being patient for a month. Anyway, I believe the IMCO is faster by a tick.
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Old 08-04-2022, 02:26 PM
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On my boat I had to put ball valves on my strainers to reduce water flow when I put the imco’s on. Was wrapping the gauge past 40 psi. 25-28 with sportmasters.
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Old 08-04-2022, 02:46 PM
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Ive got -4 steam pocket dumps and -12 inter-cooler dumps so that probably why Im not seeing increased water psi like jd
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Old 08-04-2022, 03:28 PM
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Thanks for the replies. I'm willing to take the risk and switch back if they suck. I can only trim up so much and that last bit of trim makes such a big difference...I can feel it free up and speed starts climbing. I know I run the risk of losing some bow lift and going the wrong way.
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Old 08-04-2022, 03:57 PM
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Id measure the prop shaft depth now to make sure you will be ok 2 up
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Old 08-04-2022, 08:27 PM
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I’m a rookie here so go easy on me

I did a real quick and dirty measurement with a straight edge. With my drive at the max trim (4 on my indicator) my cavitation plate is perfectly parallel to the hull. It will not trim higher while running. At that trim angle (0), my prop centerline is 8” below the notch, and ~5” below the hull (measured directly in front of drive) I’ll get a more precise measurement on the pad this weekend…the notch is exactly 8. I did it with a long level and tape and not off the floor
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Old 08-04-2022, 10:43 PM
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Sounds like the trim limit is set low if it limits out at neutral trim

trim limit should occur when the cylinders are extended to 21.75”
between pin centers, that sender should have TL on it, loosen the 2 screws

If I had to pick between the 2 I’d go sportsmaster and trim down the sheg to match a stock
lower
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