Adding an aftercooler ???

[Don in Missouri]

Compression ratios are different between aftercooled and non-aftercooled trucks, right?



How severe is the risk of damage from adding an aftercooler to a higher compression engine? Will it produce more power than a lower compression engine?

 

[JBlock]

What the difference in ratio? the intercooled are 16:1 and 17:1 for std and HO.



Intercooling put a large fuel air charge in the engine, I don't see it lot different than running a higher boost pressure, guys are going to 40-45 psi on stock head gaskets,



Just a few thoughts.

 

[bgilbert]

How severe is the risk of damage from adding an aftercooler to a higher compression engine? Will it produce more power than a lower compression engine?

Don, I think I read you got this idea from someone at a Cummins dealership yes? Well, they will also tell you that you don't want a bigger turbo, injectors, pump set to anything other than stock cpl setting etc . Doing anything other than factory specs is not a good idea in their eyes. Take it with a grain of salt. I don't buy that it will hurt. You're simply cooling the hot air that enters the engine. This will be a power increase and the engine won't be at oem spec, emission standards now out the window etc. BTW if you want power, you gotta cool the air. BTW compression ratio for 89 non-aftercooled 6BT is 17. 5-1.

 

[BHiggins]

The only reason for having an after-cooler, or inter-cooler is because cold air is more dense than hot air and will support more fuel. More fuel = more power. It's the same principle as nitrous oxide in a gas motor, the nitrous (which is NOT flamable by the way) super cools the air entering the engine so it can hold ALOT more fuel. You will do no harm by after-cooling or inter-cooling your engine, only make it more efficient.

 

[JLEONARD]

after-cooling or inter-cooling your engine, only make it more efficient.

Rule of thumb is by about 5% according to a diesel engineering ref book I have.

But if you are demanding a lot of power for an extended time (ie towing), the benefits are more in terms of lower EGTs.



Cummins plays with the comp ratios on their engines to better meet the application... I think my boat Cummins, a 270 hp version that is antifreeze intercooled (like some of the busses), is 15. 5:1.

 

[Don in Missouri]

Don, I think I read you got this idea from someone at a Cummins dealership yes? Well, they will also tell you that you don't want a bigger turbo, injectors, pump set to anything other than stock cpl setting etc . Doing anything other than factory specs is not a good idea in their eyes. Take it with a grain of salt. I don't buy that it will hurt. You're simply cooling the hot air that enters the engine. This will be a power increase and the engine won't be at oem spec, emission standards now out the window etc. BTW if you want power, you gotta cool the air. BTW compression ratio for 89 non-aftercooled 6BT is 17. 5-1.

Yeah, it was clear the guy at the Cummins counter had no imagination. I figured it was as you guys are saying. Ask and learn. Thanks.