PENGARUH PERUBAHAN WAKTU PENYALAAN (IGNITION TIMING) TERHADAP TORSI DAN DAYA PADA SEPEDA MOTOR VEGA R 110 CC TAHUN 2008 DENGAN BAHAN BAKAR LPG (LIQUEFIED PETROLEUM GAS)

Abstract

This  research  is  written  to  achieve  some  objectives  as  follows:  (1)  find  out  the alteration  of  ignition  timingtoward  torque  and  power  on  110  cc  Vega  R  motorcycle  year  of 2008. (2) find out the amount of torque and power  on 110 cc Vega R motorcycle year of 2008 after setting up the ignition timing.This  research  used  descriptive  quantitative  method.  The  sample  used  in  this  study  is 110 cc Vega R motorcycle year of 2008, engine numbered MH34D70028J737691. The data are obtainedfrom  the  amount  of  torque  and  power  by  using  premium  fuel  in  a  standard  ignition angle  (100BTDC/  Before  Top  Dead  Centre)  and  using  LPG  gas  fuel  performed  on  standard ignition angle (100BTDC), advanced ignition angle (130 BTDC) and backward ignition angle (70BTDC). Based on the results of this study, it can be concluded that: (1) There are differences in torque and power on 110 cc Vega R motorcycle Year of 2008 using LPG in a standard ignition angle (100BTDC), advanced ignition timing (130BTDC) and the ignition timing backdated (70BTDC).  (2)  The  torque  producedbythe  motorcycleusingLPG  gas  fuel  inadvancedignition timing(130BTDC)  is higherthan theothervariationsignition timing, that is 7.31 Nm at 6088 rpm engine speed. Torque dropped 1.34 Nm of the resulting torque by motorcycles using premium fuel  in  standard  ignition  timing  is  8.65  Nm  at  5337  rpm  engine  speed,  (3)  The  power  is produced  by  the  motorcycle  using  LPG  gas  fuel  in  advanced  ignition  timing  (130BTDC)  is higher than the other variations ignition timing, that is 6,9 HP in 7591 rpm engine speed.  The power  dropped  0.9  HP  of  the  resulting  power  by  motorcycles  using  premium  fuel  in  ignition time standard of 7.8 HP at 7344 rpm engine speed. (4) Time optimal ignition in 110 cc Vega R motorcycle Year of 2008 using LPG gas fuel is 130BTDC or advanced ignition timing. (5) The effective  engine  speed  of  110  cc  Vega  R  motorcycleyear  of  2008  that  used  LPG  gas  fuel  in advanced ignition timing is 6000 rpm up to 8000 rpm