Question on pipes

[JTK]

Hi Guys, I am new aound here but have read quite a bit. From what I read I understand that a diesel unlike a gas(petrol) engine cannot run lean. It will only give less power when reaching a lean condition without heating up the motor like a gas version... This also leads to the fact that if you can increase the air flow(within reason) you will increase the power. correct???

Well here comes the question.. I have(just bought) a naturally aspirated 3l (2.8l) It I increase airflow on the intake(different filter) and maybe increase the diameter of my tailpipe I should get better power delivery right? Or are there any downsides to increasing the diameter of the tailpipe. What would a drop in backpresure do to the diesel?

Please excuse my questions if they appear "stupid".. this is my 1st diesel

[Wild Thing]

Hi Guys, I am new aound here but have read quite a bit. From what I read I understand that a diesel unlike a gas(petrol) engine cannot run lean. It will only give less power when reaching a lean condition without heating up the motor like a gas version... This also leads to the fact that if you can increase the air flow(within reason) you will increase the power. correct???

Well here comes the question.. I have(just bought) a naturally aspirated 3l (2.8l) It I increase airflow on the intake(different filter) and maybe increase the diameter of my tailpipe I should get better power delivery right? Or are there any downsides to increasing the diameter of the tailpipe. What would a drop in backpresure do to the diesel?

Please excuse my questions if they appear "stupid".. this is my 1st diesel

I dont think you will gain anything from increasing the intake or exhaust unless you have a turbo, even then you would need to increase the exhaust diameter from the front pipe through to gain throughput.

[JTK]

Thanks Gary!

[JTK]

What about adding an intercooler? I see a company here in SA is offering an intercooler for an 2.5 isuzu which is a non turbo motor with claims of power up from 57 to 74kw and torque 174 to 272. Now that is pretty healthy..

[Wild Thing]

What about adding an intercooler? I see a company here in SA is offering an intercooler for an 2.5 isuzu which is a non turbo motor with claims of power up from 57 to 74kw and torque 174 to 272. Now that is pretty healthy..

I cant see if that would gain anything as the intercooler is designed to work with a turbo.
Reason being that when a turbo boosts, the induction pressure is increased, and with pressure comes heat which lowers the density of the intake air giving a lower amount of oxygen molocule %, the job of the intercooler is to lower the temp of the induction air thus increasing the air density again.
With no turbo the air is drawn into the engine thus no pressure = no heat above ambient

[JTK]

yeah that is the way I thought as well.. no tubo= ambient temps.. will call them and find out what they are on about