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Home > Engine Parts > Piston > Bore up piston kit[Monster M18Kit]SwiftSport(HT81S/NA/High Compression)

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Bore up piston kit[Monster M18Kit]SwiftSport(HT81S/NA/High Compression)

1,116.08EUR

[M18 Bore Up Piston Kit for HT81S]NA/High Compression

Displacement of M16A becomes 1,770cc from 1,490cc, keeping same stroke.
Performance, strength, weight and shape have confirmed by 3D computer simulation.

*This part is need sub-computer re-setting.
*It is necessary cylinder block processing in order to install.
*This item is for Racing.

Part name		Part number	Price	Model
M18 Bore Up Piston Kit	NA high compression	139500-4350M	160,000JPY	Swift Sport HT81S
	Turbo/Super charger	139560-4350M

Displacement.		1,770cc
		[Standard 1,490cc]
Bore ¡ß stroke		85mm¡ß78mm
		[Standard 78mm¡ß78mm]
Compression [With high compression cylinder head.]	NA high compression	12.2[Standard 11.1]
	Turbo¡¦Super charger	10.5[Standard 11.1]


Attachments		¦Õ85 Forged piston¡ß4
		Piston ring set¡ß4
		Piston pin¡ß4
		Circlip¡ß8
		Sleeve¡ß4
		Head gasket¡ß1

USER-VOICE

I had Monster highflow camshaft and valve spring sets installed on my ZC31.
The skilled mechanic had the E-Manage U re-tuned to match the camshaft at the same time.

After installation the car was put on wheels-dyno and pulled out a maximum 128.5 ps at 7,300 rpm before the rev limiter cut-off kicked in, from the dyno chart it shows more power is likely to come if I could remove the rev-limiter.

Dyno chart showed 8.5 ps (deleted "on") gain on wheels, the torque and ps increased from 3,500 all the way to 7,300 rpm.

The increase of power became more significant over 5000 rpm and beyond. The engine feels of easy breathing became apparent especially at full throttle input.

Driving impression revealed that engine revving is much smoother and the sense of power increasing along with engine speed is much improved.

I can not really feel loss of power at low rpm, or if any, maybe insignificant, the engine has become more responsive to throttle input, which makes it more fun and enjoyable to drive.