gordyshreds

than compression ignition???what are the reasons for this,am i right in thinkin it's due to petrol engines being able to run lower c.r hense having more room in the cylinder to be filled with air,where as with a diesel engine due to the combustion happening under high compressions instead of using a spark you cant use as much boost??
cheers for any light.
just comparing petrol and diesel engines for performance,eg pros and cons of both etc etc etc
i know that sports and performance cars use petrol and in my mind i know why i'm just trying to elaborate on it
it's for an assignment im producing at the moment
trying to get some petrol head opinions!
so far i've mentioned about petrol engines rev quicker due to being under lower c.r, the smoothness of their operation due to the combustion process.i really need to elaborate the advantages of spark ignition

ECU Monitor Enthusiast

iTrader: (1)

Combustion trigger type is irrelivant.

Petrol engines has a lower CR than say a diesel.

E.G. Petrol: 9.5:1 Diesel 20:1

So, when you boost an engine there is more space in the lower CR engine.

The more you try to speeze into a smaller space, the hotter it gets leading
to mechanical and combustion stresses.

Air/Fuel is NOT infinitely compressable.

GARETH T

i hate dervs,,, i hate the way they drive! LUMPS of power,, horrible

derv has a slow burn speed,,, this is the reason why they dont rev! simple

gordyshreds

slow rev speed due to the compression burn process,meaning it cant rev quick due to the piston pushing against a large force?

GARETH T

derv fuel has a slow flame front progression speed!
as engine speeds get higher we have less and less time per cycle so there becauses a limit when the speed of the fuel isnt fast enough to act on the piston at a crank angle to produce useful power

does that make sense? im not the best at explaining

whats the assigment for?

ECU Monitor Enthusiast

iTrader: (1)

Gareth,

I forgot about burn speeds and flame front progression

Lets not forget emission and economy too

GARETH T

i wish we all could forget about dervs full stop

ECU Monitor Enthusiast

iTrader: (1)

So true , I bet Rhys would argue differently the muppet

gordyshreds

yeah that does make sense cheers gareth, it's just an assignment i'm doing for mitsubishi motors.i'm crap at explaining stuff so thought i'd try bounce a few ideas here!

GARETH T

im sure mitsubishi know ALOT more about dervs than me

gordyshreds

yeah trucks are us!

Rhys

GARETH T