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Old 12 January 2018, 23:57   #1
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Tohatsu 50hp 2 Stroke TDI or 4 Stroke Tohatsu 50hp

Anyone had experience with both, the newer TDI 2 stroke vs the 4 stroke Tohatsu 50hp, what is the performance difference, noise, fuel usage, maintenance, etc..

Weight and price is about the same so no issues there.

I am going to buy a new Tohatsu 50hp for my Bombard C4 but cant decide on the 2 stroke TDI or 4 stroke..

What would you buy and why, I need help with my decision..

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Old 13 January 2018, 04:10   #2
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I've not had experience of either engine so can't comment on performance or economy although I'd expect the 2 stroke to have marginaly better bottom end. And the 4 stroke better economy
Based on many years of using and fixing engines I'd lean towards the two stroke.
That opinion is based on a few assumptions
1)your a typical UK boater who won't do 100's of hours a year and the engine will be laid up occasionally for long periods
2)Not taking into account cost of purchase or resale.

The two stroke engine was for many years the benchmark for outboards because of the simplicity and ease & lack of required maintenance this realy only changed because of emmisions regulations.
Newer two strokes are high pressure direct injection which complicates them somewhat but given good fuel filtration there is still a lot less moving parts to go wrong than a 4 stroke.
Modern 4 strokes in my opinion don't stand the test of time in the same way as their 2 stroke predecessors we see engines now wrecked due to internal corrosion of the tiny waterways and water ingress into oil sumps. They also need more maintenance in terms of oil and filter changes and timing belts or chains can fail,valves and springs can also fail due to condensation during layup.

So for typical UK use and assuming you will keep the engine a long time then it would be the two stroke for me
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Old 13 January 2018, 13:25   #3
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My last 3 boats had 4 strokes, 1 was a carb and other 2 were fuel inject, they were all good motors but slow out of the hole and was thinking a 2 stroke this time around, this might be my last boat and will keep it for years so trying to get the right motor this time around.

Might as well and try a 2 stroke this time, at least no annual oil/filter changes.

Was also looking at the gear ratio of the 2 stroke at 1.85:1 and the 4 stroke at 2.08:1, would this make the 4 stroke perform the same than ?


Here is the Tohatsu 50hp TLDI info, it is a low pressure direct inject 2 stroke..

Tohatsu 50hp TLDI
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Old 13 January 2018, 17:45   #4
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Quote:
Originally Posted by jackreno View Post
Anyone had experience with both, the newer TDI 2 stroke vs the 4 stroke Tohatsu 50hp, what is the performance difference, noise, fuel usage, maintenance, etc..

Weight and price is about the same so no issues there.

I am going to buy a new Tohatsu 50hp for my Bombard C4 but cant decide on the 2 stroke TDI or 4 stroke..

What would you buy and why, I need help with my decision..

No experience yet, but about to get a 2-stroke Tohatsu 50, which weighs in at 75Kg, for a new Gemini Zapcat. The TDI weighs 94Kg, add oil and you are 20Kg heavier! Just like the Zapcat, your C4 is a light boat and the TDI may be a lot of weight on the transom. That, and price, would be my main consideration. Noise, fuel is all much of a muchness.
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Old 13 January 2018, 19:11   #5
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Originally Posted by GI-SYD View Post
No experience yet, but about to get a 2-stroke Tohatsu 50, which weighs in at 75Kg, for a new Gemini Zapcat. The TDI weighs 94Kg, add oil and you are 20Kg heavier! Just like the Zapcat, your C4 is a light boat and the TDI may be a lot of weight on the transom. That, and price, would be my main consideration. Noise, fuel is all much of a muchness.
The C4 Bombard transom is rated for 50hp and 235 lbs/107 Kg motor weight, plus I am installing a jockey seat I will be seating in middle/forward of the boat, this should also help with the max weight in back but not over transom specs..

The TLDI in 40hp weighs the same, no way am I going to 30hp, had that on my last boat, I want extra hp and max speed when needed..
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Old 13 January 2018, 21:19   #6
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The C4 Bombard transom is rated for 50hp and 235 lbs/107 Kg motor weight, plus I am installing a jockey seat I will be seating in middle/forward of the boat, this should also help with the max weight in back but not over transom specs..

The TLDI in 40hp weighs the same, no way am I going to 30hp, had that on my last boat, I want extra hp and max speed when needed..
Sounds like a plan! I agree, always go max HP. Go for the TDI, nice to have the injectors and auto-oil. What are your USD prices for the 2-str and the TDI?

When you get it, please make a good video, I would like to see that combo in action, should fly!
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Old 14 January 2018, 03:42   #7
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The TLDI is meant to be an excellent engine, I've not used one but heard good things. Apparently they have a decent bit more power than the standard 2 stroke tohatsu too. I think the standard 2 strokes are harder to get in the US? As said that would be a good option, nice and light
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Old 14 January 2018, 21:41   #8
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Originally Posted by GI-SYD View Post
Sounds like a plan! I agree, always go max HP. Go for the TDI, nice to have the injectors and auto-oil. What are your USD prices for the 2-str and the TDI?

When you get it, please make a good video, I would like to see that combo in action, should fly!
Around $6000 plus tax for a new TLDI 50 hp.
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