Kajian Study Perbandingan Performansi Mesin Otto Satu Silinder Menggunakan Alat Catalytic Converter Dengan Bahan Bakar Pertamax dan Campuran Pertamax-Serbuk Kapur Barus

ABSTRAK
Pengujian secara langsung adalah cara paling efektif untuk mengetahui performa
sebuah mesin, dalam hal ini mesin otto empat langkah berkapasitas 125 cc diuji
dengan menggunakan variasi campuran bahan bakar pertamax murni dengan
campuran pertamax-kapur barus, dengan jumlah K 1 gr, K 1,5 gr dan campuran K
2 gr , serta dengan manambahkan alat katalitik converter pada knalpot. Pengujian
ini dilakukan untuk memperoleh perbandingan nilai kalor bahan bakar,
performansi mesin, AFR serta emisi gas buang. Dari hasil pengujian dapat
diperoleh nilai kalor bahan bakar atas (HHV) meningkat hingga mencapai nilai
11,87 %, untuk nilai kalor bahan bakar bawah (LHV) meningkat hingga 17,18 %,
performansi mesin dengan bahan bakar pertamax dan campuran pertamax-kapur
barus dengan menambahkan alat katalitik konverter pada knalpot dapat diperoleh
torsi meningkat mencapai 7,82 %, daya meningkat hingga 6,93 %, konsumsi
bahan bakar spesifik menurun sebesar 16,76 %, rasio udara bahan bakar
meningkat hingga 2,64 %, efisiensi termal menurun hingga 4,82 %, kadar karbon
menurun 23, 95%, kadar karbon dioksida menurun 25,18 %,kadar sisa hidro
carbon meningkat 82,91 %, kadar sisa oksigen meningkat 6,68 % untuk
campuran K 1 gr. Untuk campuran K 1,5 gr dapat diperoleh, HHV meningkat 14,
79 %, LHV meningkat 21,40 %, torsi meningkat hingga 12,17 %, daya meningkat
10,54 % , SFC menurun hingga 28,06 %, rasio udara bahan bakar meningkat 1,69
%, efisiensi termal meningkat 5,51 %, kadar karbon menurun hingga 11,97 %,

kadar karbon dioksida menurun hingga 7,03 %, kadar sisa hidro karbon
meningkat 50,42 %, kadar sisa oksigen menurun 0,81 %. Untuk campuran K 2 gr
dapat diperoleh HHV meningkat 19,70 %, LHV meningkat hingga 28,30 %, torsi
meningkat hingga 9,56 %, daya meningkat 5,50 %, SFC menurun hingga 17,16%,
rasio udara bahan bakar menurun 4,14 %, efisiensi termal menurun hingga 4,36
%, kadar karbon menurun hingga 9,19 %, kadar karbon dioksida menurun 11,00
%, kadar sisa hidro karbon meningkat 88,22 %, dan kadar sisa oksigen menurun
hingga 0,50%.
Kata kunci: Mesin Otto 4 langkah, pertamax, katalitik konverter , kapur barus

2
Universitas Sumatera Utara

ABSTRACT
Testing directly is the best effective way to determine the performance of a
machine, in this case the machine otto four-stroke 125 cc capacity was tested by
using a variation of the fuel mixture pertamax pure with a mixture pertamaxcamphor, with the number of K 1 g, K 1, 5 g and 2 g of a mixture of K, as well as
by adding catalytic converters in the exhaust apparatus. This testing is done to
obtain a comparison of calorific value of fuel, engine performance, AFR and
exhaust gas emissions. From the test results can be obtained calorific value of fuel

on (HHV) increased to reach a value of 11.87%, for the lower calorific value of
fuel (LHV) increased to 17.18%, the performance of the engine with the fuel
mixture pertamax, pertamax and- mothballs by adding a catalytic converter in the
exhaust may be obtained torque increased to 7.82%, power increased to 6.93%,
specific fuel consumption decreased by 16.76%, fuel air ratio increased to 2.64%,
efficiency thermal decreased to 4.82%, the carbon content decreased 23, 95%,
carbon dioxide levels decreased 25.18%, the rest of the hydro carbon levels
increased 82.91%, increased levels of residual oxygen to a mixture of 6.68% K 1
gr. To a mixture of 1.5 g K can be obtained, HHV increased 14, 79%, LHV
increased 21.40%, torque increased to 12.17%, power increased 10.54%, SFC
decreased to 28.06%, the ratio of air material fuel increased 1.69%, thermal
efficiency increased by 5.51%, the carbon content decreased to 11.97%, carbon
dioxide levels decreased to 7.03%, residual hydrocarbon content increased
50.42%, residual oxygen levels decreased 0, 81%. To a mixture of K 2 g can be
obtained HHV increased by 19.70%, LHV increased to 28.30%, torque increased
to 9.56%, power increased 5.50%, SFC decreased to 17.16%, the ratio of air to
fuel decreases 4.14%, thermal efficiency decreases to 4.36%, the carbon content
decreased to 9.19%, carbon dioxide levels decreased 11.00%, residual
hydrocarbon content increased 88.22%, and the residual oxygen content decreases
to 0, 50%.

Keywords: Otto 4 stroke engine, pertamax , catalytic converters, camphor

3
Universitas Sumatera Utara