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Old 09 January 2020, 18:26   #1
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Inboard diesel question

My question is regarding Mermaid turbo 4.
Started life as a ford 2722E non turbo 72-80 hp
Mermaid modified to 140hp
mermaid rebuilt to 200hp
I have rebuilt Lister CS4 which is a 2722e 72hp
I have stripped a mermaid turbo 4 140hp
Block, bore ,stroke,camshaft,crankshaft,conrods etc are all the same part numbers,where is all this power coming from.Ok a turbo fitted, few degrees of timing advance, air intake cooler fitted,bigger nozzles and more travel on the rack in the injector pump.
I can understand this gains more horsepower but 200hp,anyone care to enlighten me
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Old 09 January 2020, 18:54   #2
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Quote:
Originally Posted by mikehhogg View Post
My question is regarding Mermaid turbo 4.
Started life as a ford 2722E non turbo 72-80 hp
Mermaid modified to 140hp
mermaid rebuilt to 200hp
I have rebuilt Lister CS4 which is a 2722e 72hp
I have stripped a mermaid turbo 4 140hp
Block, bore ,stroke,camshaft,crankshaft,conrods etc are all the same part numbers,where is all this power coming from.Ok a turbo fitted, few degrees of timing advance, air intake cooler fitted,bigger nozzles and more travel on the rack in the injector pump.
I can understand this gains more horsepower but 200hp,anyone care to enlighten me
With diesel engines its just a case of pouring more fuel in under pressure to make a bigger bang. The potential hp out of many engines is huge. The downside is duty cycle and longevity suffer. But your 2722 isnt realy putting out that much hp for its ccs even at 200hp so its still not a particularly highly stressed engine
By comparison a similar displacement yanmar 6lp is putting out 315hp
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Old 09 January 2020, 18:59   #3
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Thanks Beamish . The yanmar probably has ported and polished heads and high lift cams etc the ford is fordson major technology
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Old 10 January 2020, 13:14   #4
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You will probably find that the yanmar isn’t particularly fancy inside to get more power from a diesel add more boost longer cam duration and whack a whole load of diesel into it the limiting factor will be the amount of black smoke and the heat going into the top of the pistons so they add piston cooling nozzles
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Old 10 January 2020, 14:59   #5
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You will probably find that the yanmar isn’t particularly fancy inside to get more power from a diesel add more boost longer cam duration and whack a whole load of diesel into it the limiting factor will be the amount of black smoke and the heat going into the top of the pistons so they add piston cooling nozzles


Just to add to this, the VW 2litre diesel in my T6 is available as a 84-204ps variant. Same block, same displacement just different bling.

Ps mines a 204 :P:
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Old 10 January 2020, 15:24   #6
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You will probably find that the yanmar isn’t particularly fancy inside to get more power from a diesel add more boost longer cam duration and whack a whole load of diesel into it the limiting factor will be the amount of black smoke and the heat going into the top of the pistons so they add piston cooling nozzles
Yanmar 6lp is quite old school no electronics to worry about. Main differences are 4 valves per cylinder & higher rpm 3800max as opposed to about 2600ish for the ford
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Old 12 January 2020, 05:52   #7
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the turbo on the 140hp was a K26 , anyone know what was used on the 200hp version.
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Old 12 January 2020, 07:46   #8
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You could try giving Mermaid Marine a call. I believe they are still operating out of Poole and they still list the 200hp Turbo 4 on their website albeit in the Classic Engines part.

Mermaid Marine
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Old 12 January 2020, 14:12   #9
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GUYC thanks , I have been in touch with mermaid and they just might be getting annoyed with my questions, have been very helpful though but my problem is I need to know everything not just the basics. its a disease lol
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