This product upgrades a standard 1.8 L engine to 2.1 L torqueful engine.
The enlarged 85.5 mm bore and 89.0 mm stroke produces the enough torque power to have more powerful acceleration through all ranges of driving speed.
Maruha 2.1 L Engine Stroker Kit includes a finest machined 89.0 mm crankshaft, a durable lightweight connecting rod set, a special MAHLE 85.5 mm piston set.
Maruha 2.1 L Engine Stroker Kit, which you will end up with, is the best quality engine stroker in the Miata market.
[The kit Components (Included)]
aruha 89.0 mm Crankshaft
Maruha Connecting Rod
MAHLE Power Piston
[The Engine Accessories (Sold Separately)]
Maruha Power Metal Main& Rod Bearings
Maruha Oil Jet
Maruha Fuel Injector Set
Maruha's crankshaft made from finely machined alloy steel (chrome molybdenum 4340 steel ) has a stroke with an 89.0 mm longer that provides a vehicle with more torque.
Furthermore, the crankpin diameter of 48.0 mm is designed 3.0 mm larger than the standard ones.
It can provide the crankshaft with more durability by enlarging the overlapped area between the crankpin and the journal.
The full counterweight design for perfect balance allows bolt-on installation for the engine block.
A crankshaft requires continuous oil supply.
Maruha designs the crankshaft main journal with the two chamfered oil holes.
When Maruha Power Metal Main& Rod Bearings are used together with it, their oil holes designed in the center will allow smooth oil flow into the crankpin at each crankshaft revolution.
Figure 1 shows the continuous oil circumstances.
Red arrow in the figure indicates oil flowing.
Miata with B6 and BP engines have generally less strength of the connection between the crankshaft snout and the pulley boss because they do not have length to be sufficiently overlapped.
We have kept on R&D to develop Maruha Crankshaft, whose snout is enlarged to retain enough connection to the pulley boss.
Our design can enhance the durability of the pulley boss and also can avoid product damages in severe driving conditions.
Connecting rods have more loads according to higher engine outputs.
Maruha's H-beam style rod designed for lightweight and strength will fulfill your needs with the remarkable performance even at higher engine revolution speeds.
The rod weights about 460 g and our product is approximately 80 g lighter than MIATA stock Rods.
Our new designed big end has a 3.0 mm larger diameter than the conventional conrod to reduce loads on the crankpin journal.
The ARP rod bolts with enough diameters to withstand loads can provide more durability to our conrod.
NOTE: Maruha Connecting Rod is only for Maruha 2.1 L Engine Stroker Kit. Our conrod cannot be used for any other products.
MAHLE's 85.5 mm piston is designed for Maruha 2.1 L Engine Stroker Kit.
The lightweight piston features its high end specification including its unique piston skirt shape, and strong and anti-fractioning GRAFAL coating.
MAHLE Power Piston can also be used for MIATA stock crankshaft.
The recessed piston skirt avoids interference with Cooling oil jet.
Maruha's main and rod bearings are most suitable for Maruha 2.1 L Engine Stroker Kit.
They can supply more oil to the crankpin journal.
The bearings forged from F112 alloy have superior performance by their durability as racing spec.
You can choose among 3 sizes to make proper oil clearance adjustment.
An oil jet device injects oil to the back side of the piston for piston cooling.
However, unique designed MAHLE Power Piston may cause interference with the oil jet.
A conventional oil jet devise has a boss for installing to the engine block.
When it is fixed with Maruha 2.1 L Engine Stroker Kit, the oil jet's boss can rub on MAHLE's piston.
Maruha Oil Jet is designed to prevent any interference against the piston.
Such improvement avoids the interference with the piston, without the jet nozzle bending.
A hole on our oil jet replaced the conventional boss is used for inserting the kit included positioning knock pin into it.
Without any question, Maruha 2.1 L Fuel Injector Set, 4 pieces has superb performance for our power stroker kit.
The injector size is 300 cc/ min, while the flow of MAZDA MIATA NA8C Injector is measured about 250 cc/ min.
MAZDA MIATA NA8C and NB8C models with Naturally Aspirated (NA) engines feature their direct response, though you are required to choose the suitable injector sizes because the NA engines deliver limited power.
2.1 L Fuel Injector sends more fuel to provide more torque and power to your MIATA.
It is the best choice to be used with 2.1 L Engine Stroker Kit.
For more direct response and easier ECU operation, Maruha 4 Throttle Injection Units and our high lift camshafts are available.
NOTE: When Maruha 4 throttle Injection Unit is installed additionally, the kit included fuel delivery spacer must be used together.
Maruha 2.1 L Engine Stroker Kit provides sufficient speed and torqueful driving even at lower engine speed.
Even our early prototype power stroker was installed with 4 throttle kit (45.0 mm body size) an Maruha Racing Camshaft, the engine power far surpassed 230 PS.
Figure 2 shows that the maximum torque was approximately 25.0 kgf-m at 6,000 rpm and the maximum horse power was measured more than 230 PS at 7,600 rpm.
[NOTE]
EThe product should be installed by a professional.
[HOME]