Diesel Power - - Contents -

Ad­vanced ul­tra­light marine V-6 is the per­fect in­board up­grade for plea­sure cruis­ers

THE HYUNDAI Seas All Com­pany, an in­de­pen­dent cor­po­rate ven­ture of Hyundai-Kia Mo­tors, was founded in 2009. In that short time, the com­pany has made a name for it­self as an in­no­va­tive marine diesel engine builder.

How­ever, Seas All did not just jump into engine build­ing im­me­di­ately. Hyundai had en­gi­neers re­search­ing and de­vel­op­ing the seago­ing oil-burn­ers years be­fore the com­pany’s of­fi­cial launch. It wanted to make sure the diesels would meet the de­mand­ing stan­dards of a marine ves­sel.

To­day, Hyundai Seas All con­tin­ues work­ing to ad­vance the tech­nol­ogy used in its diesels. The re­sources pro­vided by Hyundai-Kia’s ar­ray of au­to­mo­tive diesel en­gines gives Seas All a large base of pow­er­plants to choose from for devel­op­ment of the marine line. One such engine that has roots in au­to­mo­tive is the Hyundai Seas All

S270, which fea­tures a com­pacted-graphite-iron block and graphite-in­fused pis­ton tech­nol­ogy that come di­rectly from on-road diesels. How­ever, that is where the sim­i­lar­i­ties end.

The marine-spe­cific S270 is a com­pact, light­weight, pow­er­ful, ef­fi­cient 3.0L V-6 engine. Seas All achieves th­ese ad­vances by in­cor­po­rat­ing dif­fer­ent tech­nolo­gies and ideas. Mak­ing the engine ef­fi­cient is key to meet­ing the cur­rent EPA Tier III

emis­sions and hav­ing it poised to

meet the even more strin­gent

EPA Tier IV reg­u­la­tions. The com­pact size (36.7 inches long,

31.6 inches wide, 31.7 inches high) and im­pres­sive power

(267 hp and 417 lb-ft of torque) make the S270 ideal for new ap­pli­ca­tions or retrofitting older in­board gas and diesel en­gines in plea­sure craft and mar­itime pa­trol boats.

The block’s com­pacted-graphite iron makes it lighter, qui­eter, and stronger than gray cast-iron pieces. The graphite iron has an 85 per­cent higher ten­sile strength and is 45 per­cent stiffer, giv­ing it dou­ble the fa­tigue strength of iron and alu­minum. This stronger de­sign also gives the block a much longer ser­vice life.

Much of the engine’s light weight (736 pounds) and per­for­mance come from DOHC 24-valve alu­minum cylin­der heads. Th­ese marine­spe­cific cast­ings are de­signed for op­ti­mal air­flow and com­bus­tion. The two camshafts per head are spun by a low-noise du­plex tim­ing chain. The chain is kept tight with hy­draulic ten­sion­ers. Valve lash is min­i­mized with hy­draulic lash ad­justers.

A com­mon-rail di­rect-in­jec­tion sys­tem with 1,800-bar piezo­elec­tric in­jec­tors de­liv­ers fuel to the cylin­ders. Th­ese in­jec­tors use a piezo crys­tal ac­tu­a­tor that is five times faster than a stan­dard so­le­noid. The re­ac­tion speed fa­cil­i­tates mul­ti­ple in­jec­tion events per com­bus­tion cy­cle for a more ef­fi­cient burn. An­other ben­e­fit of the piezo in­jec­tors is their abil­ity to ma­nip­u­late in­jec­tion du­ra­tion by ad­just­ing the amount of volt­age they re­ceive. Fuel de­liv­ery is prop­erly bal­anced by the elec­tronic vari­able-ge­om­e­try tur­bocharger’s boost, and a sea­wa­ter-cooled in­ter­cooler reg­u­lates the boost air’s tem­per­a­ture.

The S270 has two sep­a­rate cool­ing sys­tems. The first is an open sys­tem that pumps sea­wa­ter through the in­ter­cooler, oil cooler, heat ex­changer, and ex­haust el­bow. The sea­wa­ter pump is driven by the camshaft. The other sys­tem is sealed and filled with coolant that flows through the block’s in­te­grated wa­ter jacket and heat ex­changer and the ex­haust man­i­folds. The im­pellers in both cool­ing sys­tems are mounted to the front of the engine for easy ac­ces­si­bil­ity.

An­other de­sign fea­ture of Hyundai Seas All’s marine diesel is the ease in which it can be ser­viced. Oil is drained via an ex­trac­tion pump with a drain hose, mounted con­ve­niently at the front of the engine. The oil and air fil­ters are mounted to­ward the top of the engine.

The S270’s elec­tronic engine man­age­ment sys­tem has an Engine Op­er­at­ing In­di­ca­tor in­ter­face that dis­plays in­for­ma­tion like throttle po­si­tion, fuel con­sump­tion, engine speed, tem­per­a­tures, and di­ag­nos­tic er­ror codes to the skip­per. It also pro­vides au­di­ble alarms and con­trol lamps for warn­ings. A unique fea­ture of the EOI is the Seas Link in­ter­face. Seas Link is an ap­pli­ca­tion that al­lows all the engine’s data, di­ag­nos­tic func­tions, alarms, and pop-ups to be ac­cessed and mon­i­tored from a smart­phone or tablet.

Ad­vanced Ul­tra­light Marine V-6 Is the Per­fect In­board Up­grade for Plea­sure Cruis­ers

SPEC­I­FI­CA­TIONS ENGINE: Hyundai SeasAll S270 DIS­PLACE­MENT: 3.0L (180 ci) ENGINE LAY­OUT: V-6 VALVETRAIN: 24-valve DOHC BORE x STROKE: 3.30 x 3.50 inches (84 x 89 mm) COM­PRES­SION RA­TIO: 17.5:1 HEAD MA­TE­RIAL: Alu­minum BLOCK MA­TE­RIAL:...

Af­ter be­ing drawn into the camshaft-driven pump, sea­wa­ter flows through the in­ter­cooler into the heat ex­changer (mounted on the lower front of the engine), then onto the oil cooler just above the ex­changer. Upon ex­it­ing the cooler, sea­wa­ter is routed...

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