it's for schoolwork. and i am facing performance problem under load. I am looking around the turbo.
How are you testing /running this engine, is it in a laboratory / workshop under supervision on a Dynomometer Test bed?
If you want to boost performance, providing basic engine is sound, there may be two or three things you can play with simply on an older diesel to get more power.
Basically increase fuel, depending on what type of diesel pump it has, if Bosch where the four injector pipes come out in the middle is an adjuster which increases or decreases the amount of fuel, so if it gets weaker ,no performance turn the other way, maybe just a 1/4 turn at a time so it starts to black smoke when working hard.
Next you need to increase air (it is actually Oxygen it wants) so you go to the turbo and adjust the lever that holds the waste gate flap, it depends on design but probably a little at a time to hold the flap closed a bit longer, this should get rid of the black smoke from adjusting the diesel pump, so next you adjust the diesel pump a bit more to give black smoke as before and the go back to the turbo adjustment and so on.
The other thing with turbos is compressing the air to get more power means you create more heat in the air going intro the engine, there is a point when due to the expansion of hot air you undo the performance gains, at this point it becomes necessary to fit an inter cooler to cool the incoming air/oxygen to continue the experiment. Note the intercooler needs a good cool air flow over it to work.
All you need to do this job is a air pressure gauge in the induction side after the turbo and intercooler plus all your spanners.
Another point with diesels is they are heavy design due to the much higher compressions they run at so do not try to gain performance by engine revs or you will have a large bang and bits of broken engine flying all over the place dangerously, max revs are less than 4000rpm!!!
Diesels advantage is low speed high torque which is what this gives you.
The above information worked for me when replacing a V6 3.75 litre 150hp petrol engine with a Sofim 8104. 2.8 that was originally rated at 122hp, by the time I had finished the engine was nearly as fast as the original but with less than half the fuel consumption. By the way I used a Marine water cooled intercooler.
, i am looking for a manual for engine type sofim 8144. The only clue that i have is that the egine was propably in a Fiat Argenta 1983-1985.