Re: Friction (clutch) lining


"Dave Baker" <nothing@xxxxxxxx> wrote in message
news:f61kj5$m4$1@xxxxxxxxxxxxxxxxxx

"David Littlewood" <david@xxxxxxxxxxxxxxxxxx> wrote in message
news:d$G06WGdTDhGFw6U@xxxxxxxxxxxxxxxxxxxx

From a (not entirely expert) reading of specs, diesel engined cars tend
to have higher torque than petrol engined ones.

No they don't. For a given capacity normally aspirated diesel engines have
significantly lower torque and bhp than normally aspirated petrol engines.
However, most modern car diesel engines are turbocharged to overcome this
limitation. What you then get is a diesel engine that still doesn't rev
very high but has high torque and the same bhp per litre as a smaller
normally aspirated petrol engine. Of course if you turbocharge the petrol
engine you'll then get both higher torque and higher bhp per litre at the
same boost level as the diesel engine.

A diesel engine will always have a higher torque than an equivalent petrol,
due to the far higher combustion pressures involved. It's just that the
diesels max revs are far lower than the equivalent petrol. It's what you do
with the torque that matters. By the time the engines geared to similar
speeds, torque levels will be fairly similar for any given hp of engine.

Just looking at the spec
for my car (petrol) compared with its diesel equivalent shows torque of
350 and 650 respectively - they don't quote units but I assume it's Nm.
The 650 is given at 1800-2500 rpm compared with 3200 rpm for the 350, so
it's more than just an inverse relationship.

What is your car? Whatever the units 350 and 650 are fecking high torque
figures for a car engine. Are you sure you don't drive a railway loco?

My 1.7 diesel is rated at 285Nm, but that's not running that high a boost
pressure. The ford 2.2tdci must be putting out a fair amount of torque...


.

Relevant Pages

  • Re: Change final drive ratio...
    ... > For cruising, we're talking torque. ... Peak torque on most petrol engines ... You dont mention which engine you have though.. ...
    (uk.rec.cars.maintenance)
  • Re: Basics of a car simulator
    ... adds rotational inertia to the engine. ... Torque may be derived from RPM and for simple simulation ... Slip angles can occur without slippage. ...
    (rec.autos.simulators)
  • Re: $ 4.25 gasoline - whine
    ... Serious economists say that a lot of the wealth and power of America was built on cheap food and cheap energy. ... produce a diesel engine with emissions low enough to pass federal standards would be too costly to make. ... The only parts the diesel fuel lubricates in a diesel engine are the fuel system components, and with lower sulfur fuel being mandated now-a-days, they even do a shitty job at that. ...
    (rec.autos.sport.nascar)
  • Re: Lightweight, small transmission wanted
    ... >>> So, Chris, just where does that extra torque come from? ... >>> The increased drag will cause the transmission to wear faster. ... >- if the engine can drive it, ...
    (rec.crafts.metalworking)
  • Re: Monitoring torque on a shaft.
    ... Is the best option to clean the shaft, and apply 4 strain guages, and ... I see the usual methods for measuring shaft torque have been covered ... In the early days of IC engine development it ... was not uncommon to measure Indicated Horsepower (IHP) in addition to ...
    (sci.electronics.design)