Startup
Terima kasih banyak Anda telah meluangkan waktu untuk berkunjung.
Rotating Engineer adalah titel profesi seorang insinyur teknik mesin dengan spesialisasi keahlian di bidang mesin-mesin berputar, misalnya turbin gas, kompresor sentrifugal, pompa sentrifugal, screw compressor, reciprocating engine, dan fin fan cooler. Seorang Rotating Engineer bertanggung jawab untuk membuat agar mesin-mesin itu dapat beroperasi dengan baik dan benar.
Blog ini berisi hal-hal yang berkaitan dengan profesi seorang Rotating Engineer. Isinya diambil dari pengalaman sehari-hari, berbagai sumber referensi, dan opini pribadi saya. Topik-topiknya dapat dilihat dengan meng-klik nama bulan yang ada di kotak "ARTIKEL" di sebelah kiri.
Diharapkan dari blog ini pembaca dapat mengambil manfaat yang sebanyak-banyaknya. Pertanyaan, diskusi, dan saran sangat saya harapkan. Bisa kontak ke saya di: rotatingengineer@gmail.com.
DISCLAIMER
Saya tidak bertanggung jawab atas segala akibat yang terjadi karena blog ini. Blog ini hanya berisi opini dan pengalaman pribadi saya saja.
Sekali lagi: terima kasih banyak.
wasalam
Rabu, 26 November 2014
Selasa, 07 Juni 2011
Jumat, 16 April 2010
G300 Gearbox Berdengung


Electric Turbocharger

Electric boost uses electrical energy to drive a compressor that provides additional air density to the engine, as opposed to using mechanical energy from the engine like traditional methods (belt driven superchargers or exhaust driven turbochargers).
Example: The small tire pump you plug into your cigarette lighter is a compressor that uses very little electrical energy and can pump a tire up to 70 psi, but due to the devices low power draw, the small rate of air-flow coming from the straw-sized air-source requires over 10 minutes to pump a flat tire up to 35psi, and over an hour to reach 70 psi. Obviously useless if you placed this device on an engine intake as it would just create a massive restriction.
Example: A radiator fan uses relatively little electrical energy, and can flow 400 to 700 CFM. However, just blowing air on something does not generate pressure, unless it there is both high air-flow rate AND air-speed. This is proven when one looks at how a "RAM-AIR" scoop works. A "RAM-AIR scoop only develops .07psi at 80 MPH, but can develop .38psi when the car is traveling at 180 MPH with a perfectly efficient ram-air scoop like the ones that are seen on Indy cars or above the hood of drag cars.
The e-RAM Axial-Flow Electric Supercharger:
The e-RAM Electric Supercharger produces on demand, the pressurizing effects greater than a perfectly designed ram-air system traveling at over 220 MPH, even when your car is standing still. To accomplish this, the e-RAM incorporates a custom high-power electric motor built specifically to our proprietary specifications, drawing over 830WATTS of electrical energy (1.2HP of electrical energy directly from the car battery) while running at a speed of 25,300rpm. We mate this up to a specially designed fully enclosed axial-flow fan unit that is desined much like a single stage of a jet turbine, incorporating tight enough tolerances between the fan blades and the internal walls to provide a high capability of air-flow with a mild pressure generating potential. When energized, the e-RAM tries to flow 800cfm into the intake, but since 2L engines only require 190 cfm at 6000 rpm, and 5.0L engines only require 470 CFM at 6000 rpm, it is the differential in airflow from what the e-RAM is trying to flow vs. what the engine is trying to take in that generates the positive pressure in the intake.
Since the e-RAM is 3.75" inside diameter, even with the motor in the center, it allows a free air-flow equivalent of a 3.1" diameter intake tube, so it does not create any restriction in the intake system when not energized during part-throttle conditions.
There are only two companies that we know of that manufacture "compressors" that are driven by electric motors. These are sound concepts, however, there are several drawbacks with these technologies:
Again, the concept of using an electrically driven "compressor" for boost is a sound concept, and again, the problem is that compressors are horrible at providing unrestricted air-flow unless they are constantly running at speeds that will also generate pressure. The "electric turbo" will have to be on all the time in order to not create restriction when not energized. This means it will have to use a low powered electric motor that won't draw any significant electrical energy so it won't overheat if used in constant duty.... thus... it won't draw enough electrical energy to generate any boost and will ultimately just restrict air-flow. Also, small plastic squirrel-cage fans cannot rotate at a high enough rate of speed to generate any pressure at flow rates required by a car engine. This is because the forces exerted on the unit if it were to rotate at a high enough speed to generate enough flow to produce pressure would cause the unit to self-destruct. It doesn't matter how powerful a motor is used with this type of cheap plastic fan.
There is no "free lunch." Regardless of what PSI is claimed by ANY maker of electric boost technology, what hp gains are claimed, or at what rpms the "fan" is claimed to rotate, the laws of air-flow dynamics require a specific amount of power to generate psi at a given flow rate. Anyone claiming to do what we are doing [Axial-Flow (in-line) fan used to generate HP on an internal combustion engine] is IN VIOLATION OF OUR PATENT, and has no access to the motor technology required for this application.. Also, anyone else using any other style of "fan" based boost claiming ANY HP gains on a car engine without a power source of AT LEAST 680WATTS (48 amps at 13.88 Volts) is LYING, and just ripping people off.
Senin, 18 Januari 2010
Memilih jip murah meriah - Sebuah Pendapat pribadi
ente kayaknya mau yg oke di offroad dan onroad ya?
susah saya jawabnya. Hal ini jg dialami semua desainer jeep.
Kalau ok di offroad, maka gak enak di onroad. Sebaliknya enak di onroad, not ok di offroad.
link yg rentan kesandung kayu atau batu, dan terlalu banyak bushing yg rentan kalau kena lumpu
G-Wagen approach and departure angle

Double wishbone bushings

Double wishbone arrangement

G-wagen front solid axle
Komentar seorang teman tentang W460 Gelandewagen:
=start=
Kalian..di jamin pasti excited terutama how that suspension and braking system works...bener2 mrk design keluar dari tradition thinking at that 80's era..(Search d Net )Cheers and pls continue making your dream comes true.saya sdh pernah pelihara CJ7, tyt FJ, Jimny sierra, Landy Defender, dan dr semua ini, Gwagen mempunyai character yg sangat berbeda, kesan ciri khan Jeep di GWagen tdk terlihat atau terasa, GWagen sangat enak handling nya terutama dari posisi argonomic dari bangku sangat nyaman senyaman SUV era skrng..driver control while driving terasa sangat dominan...sedangkan suspensi jg sangat lembut tdk seperti karakter jeep lainnya..dalam keadaan lari kencang getaran pd steer sangat minimal, serta engine power sangat memadaiIntinya GWagen memang merupakan class tersendiri diantara jeep2 tsb diatas..sementara rem sytem yg dilengkapi agak oversize booter membuat driver merasa lbh in cotrol terutama dalam kecepatan tinggi...pengoperasian transmisi 4x4 nya sangat mudah....utk long drive GWagen tdk melelahkan..pokoknya GWagen posisinya teratass dari segi kenyamanan dan mobility.Mudah2an in bs menjadi racun yg mematikan...Hehehehehhe
=end=
Apalagi ente mau yg murmer, nanti malahan jadi kemahalan karena sering gonta-ganti krn tdk puas. Yg jelas JEEP = Just Empty Every Pocket. Mendingan jangan coba-coba, langsung yang bagus walau agak mahal.
Pilihan banyak.
mulai dari CJ7(as roda mudah putus), taft short (agak keras di onroad, sempit kabin belakang. Differentialnya kalau mau ditingkatkan susah nyari yg cocok), rocky (tdk solid axle, masalah nyari differential buat naikin torsi agak susah nyari yg cocok), wilis 44 (top dah, kelemahannya hanya tdk ada difflock, dan tampias kalo ujan hehehe), cherokee (tdk ada chassis & harus pake pertamax, banyak elektronik/komputer-nya), 280GE (apa ya?yg 280GE long: under power/kurang power. Minyak rem harus rutin diganti minimal 2 thn sekali). Yg jelas ada seorang teman sekarang sdh punya 280GE Short lagi, walau sdh punya defender TDi.
.jpg)
G-Wagen W460 kokpit

LR Seri III kokpit
Kalau trooper diesel dan bensin ane gak bisa ngasi komentar krn blm cukup referensi.
Kalau LR Series as roda mudah putus, nyetirnya gak enak, ruang kabin tdk ergonomis dan enak. Defender as rodanya sdh lebih kuat, namun kabin tetap tdk berubah.
Yg jelas LR = Defy = Rangie = Partsnya MUAHALLL.
Sekarang ente sregnya mau jip apa dulu, nanti baru dibahas secara detil kekurangan dan kelebihannya secara lebih detil. Walau kekurangannya suatu jip yg dipilih itu banyak, namun kalo sdh sreg di hati tdk akan menjadi masalah karena itu sdh menjadi idaman, kekurangannya ketutup ama kelebihannya.
Kalo ane pilihan pribadi jatuh ke:
wilis 44/47 (utk kalo gak hujan dan gak hari panas).
280GE SWB 4x4, M/T 4speed, difflock dpn blkg.
Contoh kasus:
Utk yang tampilannya gagah: Wrangler or Cherokee?
Wrangler gak kemahalan tuh? spare partnya jarang terdengar. Gak sempit?
Ane sarankan cherokee saja.
Untuk yang bisa onroad offroad: CRV atau Escudo?
CRV dan escudo kurang paham. Tetapi CRV saja lah kalo ane pilih. Escudo agak sempit dan boros kayaknya. CRV empuk, lebih mewah, dan lebih irit kayaknya tuh. Cuma spare part agak mahal mungkin krn honda.
Tetapi, kalau memang sudah ngebet pengen punya jip yang memenuhi semua kriteria bisa buat dibawa ke mana-mana dannamun harus murah meriah, beli yang seperti ini saja dulu: mainan jip hehehehehe.... (Minta maaf, bercanda..)
G-wagens on UNIMOG
Selasa, 12 Januari 2010
Kamis, 10 Desember 2009
Mercedes G-Wagen 280GE Right Front Wheel Bearings Replacement
Gambar, foto, tata letak, dan tulisan ini adalah hak milik penulis dan tidak boleh diperbanyak tanpa seijinnya, kecuali hardcopy utk pemakaian pribadi yang bukan bertujuan komersial. Penulis tidak bertanggung jawab terhadap kecelakaan, musibah, ataupun segala macam bentuk kerugian yang dikarenakan membaca atau pun mengikuti tulisan artikel ini.
SEBELUM BEKERJA:
BACALAH BASMALLAH,
PAKAI PPE YANG BENAR,AKTIFKAN HAND BRAKE.
I. Background
During driving “ngik-ngik” sound heard from front wheel, steering wheel sagging and vibrating.
II. Manual
From various references.
1. Outer Wheel Bearing
MB P/N = 008.981.59.05
Generic P/N = LM503349+LM503310
Qty = 1 set
Made in = SKF - Germany
MB P/N = 008.981.62.05
Generic P/N = LM300849+LM300811
Qty = 1 set
Made in = SKF - Germany
3. Outer Bearing Seal
MB P/N = 007.997.04.47
Generic P/N = 27725
Qty = 1 ea
4. Inner Bearing Seal
MB P/N = 007.997.03.47
Generic P/N = 22834
Qty = 1 ea
5. King Pin Bearing
MB P/N = 000.981.59.05
Generic P/N = LM11949+LM11910
Qty = 2 set
Made in = Timken - USA
MB P/N = 460.997.00.40
Generic P/N = N/A
Qty = 2 ea
7. King Pin Cap
MB P/N = 460.332.00.33
Generic P/N = N/A
Qty = 2 ea
8. Paper Gasket
MB P/N = 460.331.00.80
Generic P/N = N/A
Qty = 1 ea
(Replaced with Loctite Grey)
MB P/N = 460.331.01.80
Generic P/N = N/A
Qty = 1 ea
10. Lock washer
MB P/N = 460.994.00.12
Generic P/N = N/A
Qty = 1 ea
11. Plastic seal for wheel hub.
Made from From Baby milk formula tin cover
13. MB Wheel Bearing Grease
Qty = 2 tubes @150 gram
Qty = 1 ea
IV. Tools
o Torque wrench – Britool = 50 – 250 N.m
o Ring wrench = 13 mm, 20 mm, 22 mm
o Open wrench = 18 mm, 19 mm, 20 mm, 22 mm
o Socket Wrench = 27 mm, 24 mm, 22 mm, 20 mm, 19 mm,
o Pliers
Gambar 4.1. Some tools

o Hammer
o Chisel
o Drip
o Grease Pump
o Wooden Block
o Newspaper
o Tissue
o Cloth
o Rubber Hand gloves
o Leather Hand gloves
o Multi tools
o Long pipe
o Impact screwdriver
o Puller tracker
o Wire brush Kuningan kecil/sikat gigi bekas.
o Lampu senter
o Pembuka ban sepeda motor
Sebelum kita memulai mengganti bearing roda depan, sebagai ilustrasi awal berikut ini adalah gambar tampak dalam susunan komponen roda depan Mercedes Gelandewagen 280GE:

WARNING!
Ini akan memberikan keluwesan bagi tubing rem saat kita membuka hose fitting rem dan rumah caliper.
Jangan sampai hose rem patah, peyot, atau bocor.
14. Perhatikan dan ingat urutan susunan slotted hub nut. Buka hub nut dengan terlebih dulu membengkokkan lock washer (mur matahari). Putar nut searah tawaf.
17. Cabut hub roda depan.

2. gasket kertas (saya ganti dengan Loctite)
4. Inner gasket holder
250-280 N.m = M16x1.5190-220 N.m = M14x1.5
VI. Finding Result
Broken outer wheel bearing @ rollers

VII. Discussion
Diperlukan kewaspadaan dan cukup waktu untuk melakukan trial run 280GE ini agar kita benar-benar yakin tidak ada lagi kerusakan yang kritikal saat dipakai.
Sejarah riwayat pemakaian (maintenance, kerusakan, dan parts replacement) mobil tidak diketahui karena ini mobil bekas yang telah berumur 20 tahun dan telah berpindah-pindah tangan lebih dari 2 pemilik menyebabkan butuh waktu yang agak panjang untuk trial run. Alhamdulillah selama trial run bisa ketahuan ada getaran dan bunyi aneh dari roda depan.
VIII. Future Advice
Lengkapi tools: mallet karet, drift kuningan, jaw socket untuk slotted nut, mandrel untuk memasang outer bearing seal, dial gage untuk cek endplay. Harus rutin cek grease di roda. Serta steering absorber harus diganti agar saat nyetir tidak terasa getar saat melewati jalan berbatu dan agar komponen steering awet.


























