Vacume and diesel engines

[Soundguy]

And thus.. significant manifold vacume.

soundguy

 

[Iplayfarmer]

[turbo]... Also helps correct for HP loss of NA engines at high altitudes..

soundguy

I was wondering if this would be the case, but I wasn't sure. I'm glad you posted it!

 

[Soundguy]

high altitude equals lower AP.. thus NA engines suffer a bit, vs a TC's engine that has positive pressure boost. more air=more fuel

soundguy

 

[Iplayfarmer]

high altitude equals lower AP.. thus NA engines suffer a bit, vs a TC's engine that has positive pressure boost. more air=more fuel

soundguy

I knew the part about NA engines having lower horsepower at lower altitudes, but I've never had much experience with a Turbo. I wasn't sure if the thinner atmosphere would still affect a turbo since it's got lower pressure to start with.

Sounds like it doesn't.

 

[john_bud]

Well guys, stop talking about vacuum and talk instead of throttling loos.

You mean like the British word for bathroom? Why would you want to throttle the bathroom?

 

[milkman]

And thus.. significant manifold vacume.

soundguy

That would be manifold absent of nominal atmospheric pressure

 

[GuglioLS]

I agree the pressure differential is what counts. Without that pressure differential the Filter minders I installed would not indicate when it's time to change the filter on my Tractor or Dozer. Whatever you want to call it, as the filter gets more restricted the difference in pressure between the outside world and the air intake side increases. So yes there is a very small vacuum created between the air filter that can be measured as demonstrated when I blocked the air filter intake with my hand.....

I reset the filter minder, started the tractor and took this video while Esther partially blocked the air filter intake port. It shows how the filter minder operates. It is very sensitive to air intake restrictions and should work quite well to indicate when the air filter needs maintenance.



The filter minder works so well I decided to install one on my Komatsu Dozer:




Larry

 

[Soundguy]

. I wasn't sure if the thinner atmosphere would still affect a turbo since it's got lower pressure to start with.

Sounds like it doesn't.

Still better than naturally aspirated..

soundguy

 

[MikeD74T]

HoH, As some have stated & a few more understand all 4 stroke piston engines produce the same vacuum in exactly the same manner. The difference between gas & diesel engines is how and where the vacuum is measured. For non believers put a rag in your diesel intake & see how long it takes to reach the exhaust! MikeD74T

 

[MikeD74T]

I knew the part about NA engines having lower horsepower at lower altitudes, but I've never had much experience with a Turbo. I wasn't sure if the thinner atmosphere would still affect a turbo since it's got lower pressure to start with.

Sounds like it doesn't.

You misread Soundguy's post. He said NA engines produce lower HP at lower AP (absolute pressure) which occurs at higher altitudes. The most HP is produced at sea level or, in the case of Turbo/super chargers, lower than sea level ( which is a higher AP). Turbos & superchargers make thin air thick. This also works on a cold day in Death Valley for those that think lower than sea level only occurs under water. Yes - it's counter intuitive. MikeD74T