Outer Limits 4x4 Board

Hi there, anyone knows if the common O2 sensors and Air Fuel Ratio metes do work with diesel engines? i've a table that compares gasoline lambdas with diesel ones , but im not sure if the gauge will work if the engine has a turbo....

My idea is too keep checking before the mixture gets to lean and possibly damage the engine.. (has already happened to me)

Thanks,
Plafo

Plafo wrote: My idea is too keep checking before the mixture gets to lean and possibly damage the engine.. (has already happened to me)

Too lean is not a problem with diesels, anly too much fuel (too rich).

There is no need to install an airflow meter or mixture meter (impossible anyway since the injectors are in the head). All you need is a pyrometer or EGT sensor - basically a high temperature thermometer - since the temp measured is proportional to how much fuel is being injected and how hard the engine is working.

ISUZUROVER wrote:

Plafo wrote: My idea is too keep checking before the mixture gets to lean and possibly damage the engine.. (has already happened to me)

Too lean is not a problem with diesels, anly too much fuel (too rich).

There is no need to install an airflow meter or mixture meter (impossible anyway since the injectors are in the head). All you need is a pyrometer or EGT sensor - basically a high temperature thermometer - since the temp measured is proportional to how much fuel is being injected and how hard the engine is working.

Okey man , anyway my engine blown (3L) when i installed the turbo without adjusting fuel pump , so you recommend an EGT , i'll check for one...

Thanks a lot pal,
Plafo

Plafo wrote: Okey man , anyway my engine blown (3L) when i installed the turbo without adjusting fuel pump , so you recommend an EGT , i'll check for one...

More likely it was the engine wasn't in good enough condition to handle the boost from the turbo.

I agree with Ben, Too much Boost or too worn an engine
J Top

J Top wrote:I agree with Ben, Too much Boost or too worn an engine
J Top

Not likely that i think , i opened the engine 1 week before installing the turbo , all seemed to be okey , the compression was very very good , anyway ... i hope it will stand the turbo after the rebuild...

We'll see , another thing ,3L bellhousing is the same as 5L?

Greetings,
Plafo

tttoooo mmuuuccchhh bboooooooosssttt

mavzilla wrote:tttoooo mmuuuccchhh bboooooooosssttt

But was just 0.6 Bar! , arround 8 PSI..... that isnt so much i think no?

Plafo wrote:

mavzilla wrote:tttoooo mmuuuccchhh bboooooooosssttt

But was just 0.6 Bar! , arround 8 PSI..... that isnt so much i think no?

It can be for some engines - what EXACTLY went wrong with the motor after you installed the turbo???

ISUZUROVER wrote:

Plafo wrote:

mavzilla wrote:tttoooo mmuuuccchhh bboooooooosssttt

But was just 0.6 Bar! , arround 8 PSI..... that isnt so much i think no?

It can be for some engines - what EXACTLY went wrong with the motor after you installed the turbo???

I can tell you exactly what i saw but i dont know WTF happened...

my engine has :

Pistons rings went all weared out , the engine block , well more accurate the chambers were scratched by the pistons... just that.

what could have happened?

Were the scratches a cross hatch look, if so thats the honing on the block. If they were straight up and down, then something got into your engine to be able to do that.

Rings are meant to wear down, but it takes a looooong time usually... doesnt sound like your engine blew from what you describe, its just age..

South wrote:Were the scratches a cross hatch look, if so thats the honing on the block. If they were straight up and down, then something got into your engine to be able to do that.

Rings are meant to wear down, but it takes a looooong time usually... doesnt sound like your engine blew from what you describe, its just age..

Pal , letme tell you , the engine before the turbo had compressions between 35 and 38kpa , the standard descrived in the engine's manual is 33 or more , so i think the rings were fine..

The scratches were multiples lines going up and down....

very ugly...

Diesels don't have a throttle - instead the fuel is regulated. So the air fuel ratio varies over a very wide range.

The leaner the mixture, the better a diesel engine likes it and the cooler it runs (unlike petrol/gas engines).

The na toyota egines run a high compression ratio, in the order of 22:1, which limits how much boost you can run. Turbo engines generally have a compression ratio of about 17:1 or 18:1.

Fuel injectors leaking or not atomising/spraying properly can wash the lubrication from the cylinder walls leading to scoring and ring wear. Might this be a reason for your engine failure? Makes more sense to me than blaming the air fuel ratio.