high altitude test, why is it?

[Anonymous]

It's true, I saw on the local news a story on how to make homade bio-diesel out of vegetable oil and kerosene. Using used vegetable oil is a terrible idea though, and I wouldn't suggest trying it at home unless you knew, really knew, what you were doing.

Fuel injection components have assembly tolerances in the microns, and are designed to be lubricated by the fuel that they pump, a fuel with a specific viscosity and sulfer/ash/metal content. If you burn up an injection pump, or clog it up, it will only cost a LOT of money to fix.

[Anonymous]

Adrian is right about high sulfer diesel fuel for offroad use only being dyed red, and the fine is enough to put a trucker out of business.

Older diesels with turbo chargers have what is called an "Anaerobic valve", it's a small chamber with a rubber diaphram that measures the difference between atmospheric an boost pressure, and limits fuel rack movement until the turbo supplies a certain amount of boost. In the past, some truckers thought disconnecting the valve would get more power ( especially in Puerto Rico, where I lived for eight years), But all they are really doing is making a lot of black smoke. I have seen valves from such an engine, where the driver complained he was not getting any power. The valves had carbon deposits so large that they where the exact shape of the port when the valve was closed !!!!

[ericsp]

QUOTE: Originally posted by Modelcar

...What is the difference at high altitude....one atmosphere...?

One Atmosphere is defined as the (usual) air pressure at sea level, 14.7 psia or 101.325 kPa. So the difference would be less than one Atmosphere, otherwise the barometric pressure would be zero.

[Hugh Jampton]

QUOTE: Originally posted by ericsp

QUOTE: Originally posted by Modelcar

...What is the difference at high altitude....one atmosphere...?

One Atmosphere is defined as the (usual) air pressure at sea level, 14.7 psia or 101.325 kPa. So the difference would be less than one Atmosphere, otherwise the barometric pressure would be zero.

In space no one can hear you blow for a grade crossing.

[Modelcar]

....So if one could reach that point where atmospheric press. was zero..[by theory], then that press difference talked about in a previous post would be one atmosphere...But we could not pump any pressure with our turbo at that point as we have nothing to pump.......??? Of course the engine wouldn't run either.