Diesel Turbo Charger

Hi there! On your turbo query---> if the exhaust is of a sufficient volume and magnitude the control of air charge is controlled by the waste gate on the turbo charger; slow or impede the opening of the waste gate and you should be able to increade the amount of boost. BE CAREFUL you don't overload the bottom end of the engine (crankshaft, rod and main bearings)!

Turbos used on Diesels are pumping into what is an already very high compression environment. The turbo unit was sized accordingly.

We weren't told what kind of engine the smaller one is. We don't even know if its a diesel! It may be that the turbo unit simply is too small, even though the plant it's on now is relatively small

Still I suspect that you were right in checking the waste gate.

On a turbocharged diesel engine, the compression ratio is lower compared to the non-turbo charged version. This provides more fuel economy at idle and low power. When a higher power demands are placed on the engine, the turbo can progressively take the compression ratio up to well over 20:1.

Another advantage of turbo charging is when the engine is going from low revs to high revs; it is trying to suck in progressively more air, but the air gets stretched meaning that less air ends up in the cylinder than if it were at a constant rev. The turbo blows the air in [after the initial turbo lag] so overcoming this problem.

So to put it more simply, a turbocharged diesel engine, in effect, has a variable compression ratio. Simply bolting a turbo on to any old engine will not achieve much especially as the third component in the system is the engine management system. If the engine doesn't know what to tell the turbo to do it cannot do it.

Jon D

Sir,

After deducting the back pressure energy, if you have dry type big size airfliter with ducting fitted in front prarallel to the grill of radiator, 25% more power will be there.

More over quick often c;eaning of air filter is required to maintain some output.

K.S.Ramaswami.

The exhaust section of the turbo is too large for your present application. It just won't spin fast enough to get you more boost. You can try to place an insulation wrap on all the exhaust components from the block to the exhaust inlet of the turbo. That may help get a little more. If you can get a smaller turbine wheel with the corresponding housing to replace the current setup you will get more boost. If a waste gate is involved, you may have to adjust the dumping pressure setting to allow you to get additional boost. If this is all 'Greek' to you, better leave it to the pros. Your current 10 psi boost really isn't too bad. That 10 psi should be getting you about 50% more hp than without the turbo. That's provided you can get the additional fuel into the cylinders. Good luck.

An intercooler will help in cooling the charge and placing more air (denser air) into the motor for more power.

Hi I work for a company called vestas aircoil who design and manufacture charge air coolers for large diesel engines. I would be happy to answer any questions