Sign Up!
Login
Welcome to Motorcycle Thailand
Saturday, 01 October 2016 @ 08:28 AM ICT
eMail Article To a Friend

Variable Compression Ratio Engines are Coming

Motorcycle Parts

Compression ratio is a very important term used for internal combustion engines. It is the ratio between the volume of the cylinder when the piston is at its bottom dead center and the volume of cylinder when the piston is at its top dead center. In essence, compression ratio defines the ratio to which a charge of incoming air-fuel mixture is compressed between the piston and cylinder head before combustion takes place. Once an engine is designed, its compression ratio is fixed for its lifetime, until now.

After 20 years of development, Nissan is finally ready to display a new four-cylinder turbocharged engine that can vary its compression ratio.

Now I know that you all think, what has Nissan to do with motorcycles… But not forget that Nissan has some interest in making a motorcycle. In 2014 Nissan revealed to friend and foe a 1500cc three-cylinder turbocharged motorcycle engine that was capable of producing 400cc horsepower and weighing only 40 kilograms. For comparison the average MotoGP engine delivers around 260 horsepower.

eMail Article To a Friend

SW-Motech Legend Gear Retro-Look Luggage Solution

Motorcycle Parts

Retro style luggage for cafe racer and scrambler style motorcycles are not always easy to find. German SW-Motech has a whole line of Legend Gear luggage solutions for retro style motorcycles.

These retro-style panniers look great. There are bespoke steel carriers for the Triumph Bonneville, Ducati Scrambler and BMW RnineT, but we have a universal-fit strap that attaches around the seat for the panniers to fit on. So basically it can be adjusted and used on any motorcycle.

The panniers have a reinforced back and base, with synthetic leather at the bottom and a hard-wearing, water-resistant canvas top. They also have dry bags to go inside the panniers.

eMail Article To a Friend

Cafe Racer and Dual-Sport Ducati Scrambler for 2017

Motorcycle News

Talk of additions to Ducati’s Scrambler range has been rife over the last year, and the speculations is set to come to reality for 2017 with two new versions added to the line-up.

Documents recently filed with the California Air Research Board (CARB) reveal that as well as the basic Ducati Scrambler, there will be separate Scrambler DS and Scrambler CR variants in the new line-up.

The initials suggest that the DS, standing perhaps for Dual-Sport, is recently spied enduro version. While the CR has yet to break cover, surely the letters must stand for ‘Cafe Racer’. Plenty of brands already offer bolt-on bits to make cafe racers from Ducati’s Scrambler, so it makes sense to add its won for an in-house transformation.

eMail Article To a Friend

The 2017 Honda Monkey Bike

Motorcycle News

The motorcycling world didn’t pay much attention when Honda showed its ‘Monkey Concept’ at the Bangkok Motor Show in March this year. It’s not surprising, really, given that Honda never even released any official pictures.

But new design patents show that the iconic old-school Monkey bike could be reborn and have a production future.

Although instantly recognizable as a Monkey bike, the MSX125-based design is actually a lot bigger than the original Honda Z50 Monkey bike. Those are 12-inch wheels, where the classic Honda Monkey bike has eight-inch rims, so the fact the motorcycle is still in proportion shows it’s something approaching 50 percent larger.

eMail Article To a Friend

The Honda VFR1200X - Honda's Big Adventure Bike

Motorcycle Reviews

While currently the Honda CRF1000L Africa Twin gets almost all the attention we easily could forget that Honda also has the range-topping VFR1200X Adventure-Bike available in Thailand.

The Honda VFR1200X borrows the liquid-cooled 76-degree V-Four engine from the VFR1200F. The angle between the two banks of cylinders combined with a 28-degree phasing between the crankpins was designed to eliminate vibration, and the Honda VFR1200X is noticeably calm for a huge V-Four. It features Honda’s Unicam SOHC configuration, which creates more compact dimensions for the 1237cc 16-valve engine by reducing the size and weight of the cylinder heads, and optimizing combustion-chamber shape. Compression was changed slightly from 12.0 to 12.1:1 and performance was reconfigured for more low-end torque. The intake howls, but is not replicated by the exhaust. Aftermarket pipes will be a popular breathing upgrade to make this beast sing.

Honda Selectable Torque Control (HSTC) constantly monitors wheel-speed. When a difference in speed between front and rear wheels is sensed, engine torque is momentarily reduced by a combination of ignition cut and modulation of the throttle butterflies through the throttle-by-wire system. As the difference in wheel-speed decreases, the system shifts into modulating only the throttle butterflies to ensure a smooth transition as the HSTC reduces intervention. The system features three levels of engagement, selectable via push-button, and can be switched off. As a traction control solution, I found it extremely and annoyingly aggressive in its highest setting and preferred to dial it down.

eMail Article To a Friend

Double Podium for Movistar Yamaha MotoGP at Motorland Aragón

Motorcycle Racing

Today's Gran Premio Movistar de Aragón proved to be the most action-filled race of the season so far, as Movistar Yamaha MotoGP rider Jorge Lorenzo fought off his rivals to secure a hard-fought second place. Teammate Valentino Rossi also used his YZR-M1 to the fullest to fend off the competition and secured the fourth double podium of the season for the Factory Yamaha team.

Lorenzo didn't let a crash in warm-up this morning hold him back in today's race. The local hero had a brilliant start from third on the grid and fought for the holeshot with Marc Marquez. Maverick Viñales soon joined the fight for the front, beginning a Spanish duel that had the race fans on the edge of their seats. A flurry of activity followed that saw Lorenzo finish the first lap in third position, closely followed by his teammate. A mistake by Marquez two laps later made Lorenzo storm to second place and he continued to claw his way to Viñales, but he had to let his teammate past.

The top three riders briefly formed a leading group as they upped their pace, dropping low 1'49s laps. However, Marquez was closing in and with 17 laps remaining he found a way past Lorenzo, but the Mallorcan wasn't fazed. He made his experience count and waited for the right moment to fight his way back to the front, which came with 14 laps to go when he didn't need a second invitation to pass Viñales after the compatriot had gone wide.

eMail Article To a Friend

The Nexx X.G100 Helmet - Good Designed Carbon-Fiber

Motorcycle Parts

It doesn’t matter how much money you have – you can’t buy good taste. More importantly, though, you can’t put a price on safety. Try telling that to Portuguese company NEXX Helmets. It’s had a crack at giving riders the chance to do both, with its NEXX X.G100 helmets.

We know taste is subjective. Or at east that’s what people with bad taste say. But you’d struggle to find someone who thinks these helmets aren’t pretty. They’re like dolphins at sunset, or some other beautiful thing…

From the NEXX X-Garage range, the X.G100s are handmade in Portugal, Europe and include the limited edition range of Maria graphics designed in conjunction with the Maria Riding Company, a well-known Portuguese motorcycle builder. The result? Bonita!

eMail Article To a Friend

MotoGP Racing Getting Too Fast?

Motorcycle Racing

Kurt Trieb, the KTM engine designer responsible for the V4 MotoGP engine believes the MotoGP bikes are too fast. ‘Riders are doing more than 350km/h on the straight at Mugello; it’s getting very, very fast.

Perhaps there will be some rule changes in a couple of years; maybe an air restriction. I’m not happy about this! I would rather go for a lower-capacity engine’

If I was asked what engine we should use for MotoGP, I’d have said prototype 600cc normally-aspirated engine with very limited electronics. I think that would be very attractive.

eMail Article To a Friend

Crankcase Pressure and Engine Performance

Modify & Maintenance

Nearly a month ago, we looked at the problems created by crankcase ventilation. These ventilation systems route the combination of gasses escaping past the piston rings, mixed with vaporized engine oil from the crankcase, to the intake tract, where they are supposed to be burned on a second trip through the combustion chambers.

Although Positive Crankcase Ventilation (PCV) systems have been required since 1961, they have serious drawbacks – mainly the accumulation of carbonized oil on the walls of the intake and exhaust passages, the backsides of the valves and in the combustion chambers, where it badly reduces airflow and can cause overheating. In addition, oil particles in the combustion chambers can initiate detonation, quickly creating major damage. Let’s look at what you can do to avoid such problems on your own motorcycle engines.

It has been reported that, at idle, typical blow-by composition is 67 percent oil, 22 percent fuel, 10 percent water and 1 percent solids by weight. An inevitable by-product of combustion, water is the greatest single cause of preventable engine wear, creating corrosion by oxidation and acid formation. Tests have shown 0.2 percent water in the engine oil is typical but levels of .4 to .5 percent are not uncommon, and at these higher concentrations, free water is likely to separate out as the engine cools. Plus, ironically, the situation is made worse by the water dispersal additives in modern engine oils, and the use of E10, E20 or E85 fuels (containing 10, 20 and 85% ethanol) that both attract water and are more electrically conductive than gasoline, creating galvanic corrosion.

eMail Article To a Friend

The Quality of Japanese Motorcycles

Motorcycle ReviewsThe quality of Japanese motorcycles which are no longer actually made in Japan gives some cause for concern. Recently we have seen recalls for Honda, Kawasaki and Yamaha motorcycles. Often the same model has multiple issues the Honda CB300F had potential crankshaft bearing failure and some fire risk from faulty wiring, the Yamaha MT-03 and YZF-R3 had also several serious and less serious problems, and we recently saw a recall for the Kawasaki Z125 Pro.

I’m around 50 years old now and can’t remember anything like this ever happening before. There must have been recalls in the ‘80s and ‘90s, but we expected any new motorcycles we bought to be 100 percent sorted and, as far as I know, they were.

Currently it seems that a unprecedented number of motorcycles and cars are being recalled and I can’t help but think it’s a problem associated with the dreaded ‘globalization’. Japanese motorcycles used to be made in Japan. Sure, there were probably independent parts suppliers but, if a motorcycle had a Japanese brand name on the fuel tank, you could be confident Japanese engineers made sure all the motorcycle’s components met Japanese standards.
First | Previous | 1 2 3 4 5 6 7 8 9 10 | Next | Last

Advertising


Poll

How many times have you crashed your motorcycle in the last three years?

  •  Never
  •  Once
  •  Twice
  •  Three times
  •  Four times
  •  Five times
  •  More than 6 times
  •  More than 10 times
This poll has 0 more questions.
Results
Other polls | 8,166 votes | 18 comments

TMEA MEMBER

Thai Motorcycle Enterprise Association

Events

There are no upcoming events

What's New

Stories last 2 days


Motorcycle Thailand on Facebook

Motorcycle Thailand on Facebook

My Account





Sign up as a New User
Lost your password?