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Thread: Concord Mach 2 set up
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09-30-2020, 10:10 PM #15000 RPM
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Concord Mach 2 set up
Anyone played around w a '86 Concord Mach 2 set up? Mine still has the stock 19" swim platform/setback bracket. Power is a 25" 2.5 200 Merc and a 23" through hub prop. Best speed has been 63 mph on gps @ 5800 rpm while porpoising almost uncontrollable at neutral trim. I will be doing a complete structural rebuild this winter and probably won't be putting the platform back on. I'm thinking a 14" hydraulic jack will be a good start.
Thanks for any info
Pat
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10-12-2020, 07:20 AM #2Member
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Pat
i have a 97 Mach II with the stock 18-19 inch set back with an additional 3inch manual jack plate. The boat is actually running a 20 inch 300 Merc. Performance is great with this setup. I recommend reinstalling the factory setback platform as it distributes the engine torque and load across the entire transom and a standard jack plate only distributes it across the engine mount surface.
Love those concords!!
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10-12-2020, 07:23 AM #3Member
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I am also getting 80 on the gps with a 24 fury. Mine does porpoise more with a three blade and is completely gone with a four blade. Also loses some speed with the 4 blade
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10-12-2020, 10:26 AM #45000 RPM
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Hey MercRoy, saw you at the beach yesterday and that is a super nice concord you have there.
1971 Sidewinder 14 SS w Johnson 90 v-4
1959 Texas Maid Falcon w Mercury Mark 35A
1981 Sylvan Sportster w Johnson 85 v-4
2006 Harris pontoon with a Yamaha 90
1969 Sunfish sailboat
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10-12-2020, 10:32 AM #5Member
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Hey turtleherder Thanks
it’s coming along fairly well
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10-12-2020, 10:08 PM #65000 RPM
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Thanks for the reply MercRoy. I was thinking all that set back was a major contributor to the porpoising. What speed and trim position does the porpoising occur on your rig? I ran a 20" on mine for half this summer, propshaft height about 1 1/4 below the pad, and it worked fine at 45mph and below in calm water. In rough conditions, this set up had a tendency to nose dive, allowing the prop to lose bite. Plus the porpoising was so bad over 50 the best speed I got was about 57. When I switched back to a 25", prop shaft height is 4 1/8 below the pad rough water handling was great and the boat responded to trim input much better. Now I can go 53- 54 before the porpoising starts. Over 55 it goes ape **** til 62-63. I think after the restoration and some more set up time, its going to be a kick ass rig
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10-13-2020, 06:24 PM #7Member
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From my experience your symptoms are pointing to proper engine height and prop selection
20 in motor set 3/4 above pad with a 24 fury and full tank of fuel. I have some porpoise at approx 73-76 but nothing that is out of control or unsafe. With 1/8 tank the porpoise is gone all around and picks up 4-6 miles per hour. porpoise is extremely more noticeable with 25 tempest under exact same conditions and is 8-10mph slower. Porpoise is completely gone Utilizing four blade 28 or 24.
my setup responded very positively with speed and porpoise when I went above pad but had to use prop like the fury or 4 blade to keep from loosing grip.
What prop are you using?
I recommend looking at prop selection
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10-14-2020, 09:10 PM #85000 RPM
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I think you're right on. It looks like blade area is the ticket for the Concord. The prop I was running is a Merc Laser 23 three blade. The only other prop I've tried is a Mere 21 thru hub cleaver, which resulted in the same performance.
How's your set up work in rough water?
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10-15-2020, 04:30 AM #9Member
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I see no change in performance in rough water
big hub props is where it at with these machines!!
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10-15-2020, 04:35 AM #10Member
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I do get prop slip on a hard hole shot just as the boat is planing out. I contribute that to engine height being too high. Hydro jack plate will fix that this winter
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10-15-2020, 07:54 PM #11
Hey guys, post some pics if you can. Thanks.
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10-15-2020, 09:15 PM #125000 RPM
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Blade area, large hub, engine height and more set back. We’ll have to do some research on hydraulic jacks with minimal set back. I’ll probably be alright with and additional 4-5 inches of set back with my 400 lb 200. You might be at the limit with your big bad 300.
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10-15-2020, 09:28 PM #13Member
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Well
i agree but what’s another 2 inches gonna hurt
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10-17-2020, 07:40 AM #145000 RPM
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True enough. TH Marine makes a self contained 4” hydraulic plate. Bob Machine has a 4” as well, but a pump has to be mounted in the boat
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10-27-2020, 10:15 PM #155000 RPM
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I meant to ask what your favorite 4 blade is and how it effected performance and speed
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