Public service vehicles such as motorcycles can currently use some type of fuel choices for gasoline motors of Pertamina include premium and pertamax. Each type of fuel has different an octane number. The performance of the motor is heavily influenced by several factors; one of them is type of fuel used. The purpose of this study was to determine the difference effect octane number of the gasoline fuel performance torque, power, and to analyze the specific fuel consumption of the motor 4 gear.This experiment tries to test motor performance, torque, power and then analyzed fuel used especially Pertamina product such as premium gasoline and pertamax. Each type of motor gasoline was tested on 108 cc Honda type Beat 2012 using dynotest, which is connected to the computer. The computer will record chart changes in torque and increase power of the engine rotation of 500 rpm to 9500 rpm. Meanwhile the specific fuel consumption is calculated based on the time required to spend any fuel that is tested. This study was conducted at a laboratory of Surabaya University.The results showed the maximum torque is achieved at the gasoline pertamax of 116.15 Nm at 2000 rpm rotation, followed by a mixture between 50% pertamax and 50% premium 99.93 Nm at 2500 rpm rotation, and premium gasoline 67.53 Nm at 2500 rpm. Meanwhile, on the maximum power of gasoline pertamax is 6.6 HP at 4000 rpm and 4500 rpm, followed by 6.5 HP gas mixtures at 3500 rpm rotation until 4500 rpm and 5500 rpm rotation, and a premium of 6.4 HP at 5500 rpm rotation. For a minimum specific fuel consumption of 0.41 kg pertamax owned / kwh at 3500 rpm rotation until 5500 rpm, followed by premium gasoline by 0.48 kg / kWh at 5500 rpm, then the gas mixture of 0.53 kg / kWh at 3500 rev rpm to 4500 rpm.

The cooler system of chiller water consists of two cycles which interconnected each other that is the primary cycle and the secondary cycle. This primary cycle is the cooler system of vapor compression and the secondary cycle is the water cooling system which is circulated and met the part of evaporator from primary system. This research is conducted to compare the value of COP (Coefficient Of Performance) by used two expansion devices that is thermostatic expansion valve (TXV) and capillary pipe which are attached in primary cycle for unit of water chiller. The result of test of performance indicates that cooler system of water chiller when operating with TXV has the value of COP equal 3.86 to 4.01, while with capillary pipe equal 3.59 to 3.74. The usage of TXV is capable to cool the evaporator output water (water chilled) to 10 o C, while at capillary pipe equal 12 o C. Thereby the application of TXV if it is used to the cooler system of water chiller having performance is better to be compared by using the capillary pipe.

This general refrigeration system is used to conserve food and refreshing of air. The useful of refrigeration system depends of maximal performance this from main component as compressor, condensor, expantion device and evaporation. This research aims to know how the big high pressure compressor to its value performance. The examination is conducted by using appliance test system of refrigeration system which has been modified with the equipments of control. The refrigerant used of two variant different (R-134a and hidrocarbon refrigerant). Result of research shows that high pressure or compressor discharge from both refrigerant variant of different, the influence for value of COP (coeffcient of performance), and the economical of electric energy comsumption.

Hardness is one of the mechanical properties of a material. The hardness of a material must be known especially for materials which in its use will be suppressed and friction. To know the hardness value of the material then do hardness test by using tool of hardness tester. One method used to increase the hardness of the material is by thermal spray method. Thermal Spray is a coating technology of both metal and non-metal materials that dispray on the base with the intention of providing protection against wear or recondition of the application so that back to the original function and size. The objective of this research is to know the result of hardness of transmission rear cover of PT 2509 VOLVO A35E after reconditioning. This research was carried out in May until June 2016. The research took place at PT.Intraco Penta Pima Service located in Manggar area of Balikpapan, East Kalimantan. The research object focused on the housing rear cover transmission of PT 2509 VOLVO A35 E which has been reconditioned with thermal spray method. In thermal spray, the material may be a powder, wire or rod and inserted into the flame of a spray gun. After the analysis, it is concluded that the hardness that occurs after the thermal spray process has changed which is about 30.88 HR which previously was at 10.32 HR. Influence that occurs to the parent metal undergoing the process of reconditioning, which in the presence of the recondition process that occurs there will be a change in the nature of material hardness on the rear cover of 199%.