Diesel Power Increase

[ianj99]

interesting thread , now from one of the class , am I to deduce ,then, that cooler , therefore denser air, brought from outside the engine room and boat , via an el. fan will produce more power ?? I,ll sit down now ......

Yes, but what you need is a charge cooler made from an old Bowman heatexchanger.
The intake air goes through the centre and sea water direct from the sea cock through the outer.

This way the intake air could be significantly cooler than ambient - even in the UK!

I

 

[ulyden]

At work i have mounted a two stage charge air cooler to the inlet of the engine! This is to avoid any influence of shifting inlet temperature to the engine performance! I use cold water on hot days and hot water from the engine cooling system on cold days! Works fine!

On a boat you need a big cooler. The volume flow is 2 times the flow the cooler is calculated fore and the pressure drop is important to avoid!

 

[Jegs]

Simple Mod?

Our engine is already turbo-charged & I don't intend to modify it: but, because the air filter is fitted a metre away from the inlet vents, I have considered installing a piece of tubing from the vents to the filter possibly with an inline fan. Pointless or....?

John G

 

[PaulGooch]

Our engine is already turbo-charged & I don't intend to modify it: but, because the air filter is fitted a metre away from the inlet vents, I have considered installing a piece of tubing from the vents to the filter possibly with an inline fan. Pointless or....?

John G

On paper and according to some fancy formulae bandied around it'll increase the power by a significant and useful amount. In the real World, pointless.

The most useful post in this thread was made by VolvoPaul, IMO.

 

[ulyden]

Most engines are adjusted to a inlet temperature of 45deg so you dont get more power on a diesel as long as you dont get higher temperatueres at the inlet oft the engine, but you get lower efficancy and higher exhaust temperautures. An increase of inlet temperature of 20 deg gives 9% lower air density that givesm with constant output, 50deg higher exhaust temperature.
Add on the 20deg higher inlet temperature and you end up with 70deg higher exhaust temperature!

70deg higher extemperature gives you higher valves temperatures and you can be up to the max limit on inlet turbine temperature on a turbo engine!
The piston top and head surfase is also hotter!

Im not earning money on engine faults, i work with engines that makes money when they are running! Then its a point!

If it was my engine and if the engine was expensive i had selected the solution that gives lowest exhaust temperature and highest power!

By as mentioned it increases the income of the repair business!