Outer Limits 4x4 Board

I recently read something that was intresting,

On a turbo petrol motor the intercooler lowers the intake air to make more power and the motor can be run leaner to take advantage of this

But on a desiel motor,

The air needs to be hot to to egnite the fuel so buy lowering the air temp the motor would blow more unburt fuel out the exhurts

I also read not too touch the fuel on an after market turbo as it make the air hotter but if im lowering the temp of the air with the intercooler then i would think it would be ok to turn up the fuel to make more power,

Im seriously considering doing this if i will not crack pistons, any thoughts

roberts wrote:I

But on a desiel motor,

The air needs to be hot to to egnite the fuel so buy lowering the air temp the motor would blow more unburt fuel out the exhurts

what an odd statement.. if a desiel needs hot air to ignite how does a N/A motor run..
compression is what makes it combust as far as i knew..

pretty much with fuel pumps can be expencive to fix if u fark sumthin.. to go tinkerin with it u need a pyro to check zaust gas temps and stuff..

take my advice with a grain of salt., im no expert, just from wat i can gather readin othe rpoeple; asking same sorta stuff

A diesel relys on compression to ignite the fuel, unlike a petrol engine that needs a spark. A intercooler cools the air that comes out of the turbo before it goes into the engine. The cooler the air temp the more air you can fit into the cylinder before the compression stroke begins. The more sir, the more fuel you burn, the bigger the bang. This is where you get your power from. A good intercooler can lower the air temp by as much as 50'C.
Most new turbo diesels now come with intercoolers standard. The factorys wouldn't do this if the wasn't a real good reason for it.

Yeh, but doesnt the bang occur because the glowplug is at the right temperature during compression. So if you introduce a much cooler intake then the glowplug isnt going to be as hot, thus you will actually loose power.

So then one would also need to increase fuel delivery to combat that situation. Thereby decreasing fuel economy, but increasing HP and Torque?

Or am I just totally lost

as far as i know, only some diesel engines keep the glow plugs on while its running. most turn them off after only a few seconds

roberts wrote:II also read not too touch the fuel on an after market turbo as it make the air hotter but if im lowering the temp of the air with the intercooler then i would think it would be ok to turn up the fuel to make more power,

Do you mean put on an aftermarket turbo, and then not up the fuel to the system? Cause thats horseshit.

Diesels are not as simple as you think. as you say, too much fuel you do damage not enough you do damage too.

IF you want to do it right, then you put it on a Dyno and have the pump setup correctly by someone who knows what they are doing.

it took me 4 different places to get my turbo sorted out correctly with the fuel pump. In the end I went for a 7 hr drive to Wagga to Denco to get it sorted out correctly and it was worth it. Paid other so called experts 100's for fuck all.

South wrote:Yeh, but doesnt the bang occur because the glowplug is at the right temperature during compression. So if you introduce a much cooler intake then the glowplug isnt going to be as hot, thus you will actually loose power.

So then one would also need to increase fuel delivery to combat that situation. Thereby decreasing fuel economy, but increasing HP and Torque?

Or am I just totally lost

You need glowplugs just to start the engine, and after-glow, to prevent smoke and polution when it is cold. Stays on for up to 10 min.

Ok, so where a spark plug ignites a petrol engine, does compression + intake temp combust the diesel? Is there no other factor that creates heat to combust diesel?

My knowledge is limited to that of 2-stroke nitro RC engines and Petrol 4-strokes...

,
The force of the piston compressing the air and mixutre so fast ignites the diesel. It is the heat that is generated by this force that makes the diesel hot enough to ignite. The glow plugs are there to help on cold starts but are normally not always on.

Take it to a pro put it on a dyno and let the pros tune it right so there is no problem the cost of stuffing up a diesel far outways the little cost of taking it to a pro.

Read this, it may help
http://www.answers.com/main/ntquery;jse ... sbid=lc03a