Un nou Record mondial stabilit ieri
23 August 2006
Detalii:
JCB DIESELMAX HITS 350 MPH AND BREAKS OWN DIESEL LAND SPEED RECORD
Bonneville Salt Flats: Today the record-breaking JCB DIESELMAX achieved a stunning 350mph (563kph)* to break its own land speed record for diesel-powered cars set yesterday by Andy Green.
On Tuesday, JCB DIESELMAX became the world’s fastest diesel when Green drove it to an FIA-sanctioned speed of 328.767mph (526.027kph). Today he improved on that significantly with a new record of 350.092mph (563.418kph) after two passes in opposite directions, within one hour.
Running soon after daybreak he recorded 365.779mph (588.664kph) on his first run and 335.695mph (540.248kph) on his return, giving the average of 350.092mph (563.418kph).
As he was feted by his jubilant crew, Green said: “I am so pleased that we have got the car to 350mph which was always our ultimate goal and that was with a slow start to the second run. There is so much more to come as the car is pulling like a train and we still haven’t used sixth gear!
“Today’s record proves the potential we have always believed JCB DIESELMAX to possess. This is another great result for a wonderful team and a testament to British engineering.”
JCB DIESELMAX was JCB Chairman Sir Anthony Bamford's brainchild, born of his desire to showcase the extreme performance of the JCB444 diesel engine which normally powers the company's backhoe loaders and Loadall telescopic handlers.
Technical Specification
Engine
Two JCB444 common rail injection diesel, bored and stroked to 5000 cc, dry sumped and inclined at 10 degrees. Twin compound turbochargers with twin compound intercoolers. Ice tank cooling (capacity 180 litres)
Power 750 bhp (560 KW) at 3800 rpm
Torque 1105 lb.ft (1500 Nm) at 2000 rpm
Fuel tank Capacity: 9 litres
Transmission: Forward transmission and final drive connected to forward engine; rear transmission and final drive unit connected to rear engine. Six-speed barrel-shift transmissions driven through torsional dampers and oil-immersed multi-plate clutches.
Steering: Rack and pinion, to front wheels
Brakes: Split circuit; unique design carbon rotors and twin stators.Exhaust brakes for front and rear engines, manually operated twin parachutes.
Suspension: Independent all round via twin wishbones, coil springs and hydraulic dampers
Chassis: Hybrid square steel tube spaceframe with bonded carbon composite panels
Body: Aerodynamically designed - cdA <0.15m2; carbon composite materials
Wheels and Tyres 23 x 15, Goodyear
Length 9091mm
Width 1145mm
Height 979mm (to top of canopy, at run speed) 1337mm (to top of fin)
Front track 800mm
Rear Track 600mm
Wheel Base 5878mm
Weight 2700kg including fuel, oil, ice and water coolant and driver
The general arrangement of JCB DIESELMAX places the front engine and its transmission ahead of the driver's safety cell, and the rear engine and transmission behind.
Two six-speed bespoke gearboxes are employed, one for each engine. The gearbox is mated to the engine using a JCB designed stepper gearbox arrangement utilising oil-immersed multi-plate clutch packs from JCB's flagship 3CX Backhoe Loader. A torque tube encloses the gearbox and connects the final drive to the rest of the driveline.
Gear shifting in both boxes is synchronised and controlled electronically with shift actuation via steering wheel-mounted paddle switches.
Traction control will not be used, not just because it is outlawed by SCTA-BNI regulations but also because the aim all along has been to keep the car as simple as possible and the low Mu factor (coefficient of grip) of the salt will preclude very hard acceleration, which might induce wheelspin.
Acum sa vorbim despre motor JCB444 care este luat direct de pe JCB 4CX, 3CX and 2CX cele din poze \/
The JCB444 production engine
Since production started at JCB Power Systems in Derbyshire on 1 November 2004, production of the JCB444 engine has reached 100 units per day within 16 months. The engine is now fitted to the 4CX, 3CX and 2CX JCB backhoe loaders and the best-selling Loadall telescopic handlers.
The JCB444 is a four-cylinder inline mid-range diesel with four valves per cylinder and a 1.1 litre per cylinder design concept, hence the 444 nomenclature.
“Our intention all along with the speed record project was to use a standard engine block, cylinder head and bedplate,” explained Dr Leverton. “I set that task at the very beginning. I wanted it to be the standard design block and have exactly the same fundamental architecture. It had to be recognisably the JCB444 engine.”
But how do you take what is basically a bulletproof industrial engine and turn it into a record breaking powerplant?
“The JCB444 has been designed with a very stiff bottom end. It’s designed to sit there for hours and hours and hours, chugging out the required **********. It’s an incredibly tough, longlife engine. Our engine has the inherent strength to cope with the very high cylinder pressures generated when harnessing two-stage turbocharging to boost power to 750bhp”.
The land speed record engine develops almost 1500 Nm of torque at 2000 rpm, with a rev limit of 3800 rpm. At two hours, life expectancy is high for a racing engine.
Each engine will be laid over in the car, inclined at an angle of 10 degrees from the horizontal to minimise the frontal area of the machine.
If the engine is the heart of the vehicle, then the combustion system is very much the heart of the engine, and the JCB DIESELMAX engines have been designed using Ricardo’s High Speed Diesel Race (HSDR) direct injection combustion technology. Fuel is delivered via two parallel high-pressure pumps to a common rail system delivering an injection pressure of 1600 bar. The cylinder head has been modified to enable the larger injectors required for the HSDR system. Demonstrating the robust design of the original JCB 444 engine however, the valve train is carried over substantially in its original form with the exception of high-temperature specification exhaust valve material and up-rated valve springs.
While the production engine requires a boost pressure of 1bar, the two engines installed in the
JCB DIESELMAX require 5.2bar absolute at full power. The scale of this challenge can be appreciated in comparison with around 3 bar absolute for a diesel Le Mans racer, and around 4 bar for the turbo-era Formula One cars.
The results of the JCB DIESELMAX engine development work are truly impressive and the headline figures speak for themselves: with each delivering peak power of 750hp and torque of 1500Nm,
the engines are over five times the power of the production version and at 150hp/litre, they exceed even motorsports applications as the world’s highest specific power diesel car engines.
am atasat mai jos cateva wallpapere
JCB DIESELMAX - World's Fastest Diesel
