Studi Eksperimental Komparasi Bukaan Katup Intake Dan Modifikasinya Terhadap Unjuk Kerja Motor Bensin 4 Langkah DOHC 4 Katup

Kusbandono, Hermanu (2014) Studi Eksperimental Komparasi Bukaan Katup Intake Dan Modifikasinya Terhadap Unjuk Kerja Motor Bensin 4 Langkah DOHC 4 Katup. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Performa motor bensin dapat ditingkatkan salah satunya dengan memaksimalkan asupan atau efisiensi volumetris bahan bakar udara yang masuk ke dalam ruang bakar, dengan waktu pemasukan yang tepat pada putaran yang tepat akan meningkatkan unjuk kerja motor. Waktu pemasukan bahan bakar-udara dalam mesin motor bensin diatur oleh camshaft. Penelitian ini bertujuan ingin mengetahui karakteristik unjuk kerja motor bensin dengan merubah bukaan katup melalui modifikasi camshaft. Penelitian ini menggunakan metode komparasi antara unjuk kerja engine standar dengan variasi dan modifikasinya di laboratorium performa motor UNESA (Universitas Negeri Surabaya) menggunakan mesin motor bensin 4 langkah 4 katub DOHC, dengan memakai sasis dynometer inersia dengan memvariasikan derajad bukaan katup intake standar (in open 5° sebelum TMA – in close 40° setelah TMB) dan derajad bukaan katup intake modifikasi (in open 23° sebelum TMA – in close 56° setelah TMB). Variasi derajad bukaan katup standar dilakukan dengan menggeser intake camshaft +15° +10° +5° -5° -10° -15° dihitung dari titik bukaan standar dan variasi bukaan katup modifikasi dengan mengganti camshaft intake dengan camshaft modifikasi dan juga menggeser cam intake +5° -5° -10° -15° -20° juga dihitung dari titik bukaan intake modifikasi Pada penelitian ini didapatkan bahwa menggeser durasi bukaan katup intake standar -15° didapat peningkatan nilai torsi sebesar 8% dan daya naik sebesar 25% di putaran mesin dibawah 7500rpm, dan pergeseran +5°, memberikan kenaikan torsi dan daya sebesar 8% di putaran mesin diatas 7500rpm. Untuk camshaft intake modifikasi, pergeseran -15° memberikan kenaikan torsi sebesar 32% dan daya naik sebesar 31% di putaran mesin dibawah 7500rpm dan untuk camshaft intake modifikasi dengan pergeseran +5°, memberikan kenaikan torsi dan daya sebesar 20% di putaran mesin 9000rpm. ================================================================================= Gasoline internal combustion engine performance can be improved either by maximizing volumetric efficiency of the intake or fuel air entering the combustion chamber, with a proper timing will increase the performance of the engine. The fuel-air intake timing in a gasoline engine is governed by the camshaft. The aim of this study wanted to know the performance characteristics of gasoline internal combustion engine by changing the valve opening through a camshaft modification. This experimental study uses a comparison between a standard engine performance with variations and its modifications in the motorcycle engine performance laboratory at UNESA (State University of Surabaya) using a petrol engine 4 stroke 4 valve DOHC engine, chassis using inertia dynometer by varying the standard intake valve opening degree (in the open 5 ° before TDC - in a close 40 ° after TMB) and intake valve opening degree of modification (in the open 23 ° before TDC - in a close 56 ° after TMB). Standard valve opening degree variation is done by shifting the intake camshaft + 15 ° + 10 ° + 5 ° -5 ° -10 ° -15 ° is calculated from the point of standard openings and opening variations modified by replacing the valve with the intake camshaft and camshaft modifications also shift the intake cam + 5 ° -5 ° -10 ° -15 ° -20 ° were also calculated from the point of intake openings modification. In this study it was found that shifting the intake valve opening duration -15 ° standard torque values obtained increase of 8% and power rose by 25% in under 7500rpm rev the engine, and shift + 5 °, providing torque and power increase of 8% in the spin machine above 7500rpm. Modifications to the intake camshaft, shifting -15 ° gives 32% increase in torque and power increase by 31% in under 7500rpm and rev the engine to the intake camshaft modification with shift + 5 °, providing torque and power increase by 20% at 9000rpm spin machine.

Item Type: Thesis (Masters)
Additional Information: RTM 621.402 3 Kus s
Uncontrolled Keywords: camshaft; variable valve timing; bukaan katup; valve openings
Subjects: T Technology > TJ Mechanical engineering and machinery > TJ799 Diesel motor--Electronic control.
T Technology > TL Motor vehicles. Aeronautics. Astronautics > TL521.3 Automatic Control
Divisions: Faculty of Industrial Technology > Mechanical Engineering > (S2) Master Theses
Depositing User: Mrs Anis Wulandari
Date Deposited: 29 May 2017 03:58
Last Modified: 29 May 2017 03:58
URI: http://repository.its.ac.id/id/eprint/41397

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