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01-30-2021, 01:27 PM #1Junior Member
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Which 60 hp 4-stroke outboard for my 12' tunnel?
I'm planning to join the 4-stroke crowd with my mini tunnel boat. I'm considering either the Merc or Tohatsu at this time.
Mercury offers two 20" 60 hp 4-strokes. A regular model and a CT model. The regular one has a 1.83 gear ratio while the CT has a 2.33 ratio. The CT is designed for heavier boats, however, when looking at the specs on this model it seems to be a 20" version of their racing 15".
The gear cases on both the 15" Merc Racing 60 and 20" Merc CT are larger and can handle larger props.
The Tohatsu has a 2.08 gear ratio and apparently it's gear case size is similar to the Regular Merc.
I like to be able to run mid to high 40's. In order to do this, with 10% slippage, I calculate the 2.33 (Merc CT) ratio would require a 21" pitch prop, the 2.08 ratio (Tohatsu) would require a 19" pitch and the 1.83 ratio (Merc Regular) would require a 17" prop.
I like to get the Tohatsu because of price and weight. However, when looking at available props from the normal suppliers, I don't see anything above 17" props for the Tohatsu. Would I be limited to 17"?
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01-30-2021, 07:56 PM #2Team Member
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Ron Hill sells props for Tohatsus
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01-30-2021, 08:43 PM #35000 RPM
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Our Club "umpba" has a 60R on our Ambush 17.5 foot jon boat. with very little set up time we have it going 45.3 mph with 2 people in a boat. you should be able to hit that number with your mini tunnel no prob with one.
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02-01-2021, 01:23 PM #4Junior Member
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Do you know the specs on the prop he is using? My guess it's a 21".
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02-02-2021, 08:39 AM #55000 RPM
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on the Ambush???
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02-02-2021, 09:54 AM #6Junior Member
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Yes I'd like to know the pitch on the Ambush, however, that's not the bigger question I'm asking. That is, which outboard would someone recommend for my 12' tunnel? Since I apparently can't buy a 19" Tohatsu prop from normal (cheap) suppliers, I realize that Hill would build me one $500. But are their other reasons why I should spend more money on the Merc 60 vs the Tohatsu and if so, which one?
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02-02-2021, 10:18 AM #75000 RPM
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yeah didn't mean to derail the thread that way. I'm partial to the merc 60R as that is what i have direct experience with. That said I do know alot of people playing with the thatsu's and they do make an incredibly nice and under rated engine.
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02-02-2021, 10:23 AM #85000 RPM
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you do get about 300 more RPM's out of the Merc but the gear ratio is 2.33 vs. 2.08. The one thing i was suprised on was the Merc has a racheting gearcase which might come in handy on your tunnel.
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02-02-2021, 02:26 PM #9Junior Member
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Thanks for the info. Since my boat will likely be under 50mph, I doubt I'd have a need for a ratcheting gearcase. I'm in Norcal and I can buy a 50 tohatsu with controls and prop for $6k. The local Merc dealer will sell me a 50 Merc, I believe the 1.83 gearcase version, for $7k+ with the controls. Looks like I will give the Tohatsu a try. Thanks for all the info.
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02-03-2021, 01:23 PM #10
Yamaha
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02-18-2021, 03:33 PM #11Screaming And Flying!
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Cross Radial......
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12-19-2021, 02:06 PM #125000 RPM
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75 stinger
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12-19-2021, 07:24 PM #13Screaming And Flying!
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How about a Suzuki, small gearcase and its only 3 cyl for 60hp, just missing the tall gear and 15"
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12-19-2021, 07:33 PM #14Screaming And Flying!
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Weight of the 15" Merc?
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12-21-2021, 05:02 AM #155000 RPM
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powerabout thanked for this post
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