The engine parameters evolution thread

[deQuincey]

What happens in your engine when you are not there to look at it ?

sort of that film about pets (what do the do when you close your house´s door)

i plan to carry on a little project of analysis of those parameters that evolve

 

[deQuincey]

My inspiration was the fuel pressure;

i do have a gauage to meassure fuel pressure in the hose after the mech pump.

pressure stays very steady in the range of 0,18 to 0,21bar while the engine is running, but when you stop the engine there is a curious effect;
the pressure stays a couple of minutes at the same value (say 0,2bar), and the it starts climbing up (i expect the pressure to go down once the cause had dissappeared, but it was the contrary.

my own expanation was that the temperature inside the engine area will increase the pressure inside the hoses

 

[deQuincey]

onther one, engine temperature:

Today I have developed a small research project, it is so small that we could say it is a "research task"

I have started my new Kthermocouple to measure temperature by contact, and thus I have discovered a couple of things:

conditions; 20km lap, warm engine, open hood, and stop engine;

The temperature of the metal in the expansion tank is 65ºC
on the valve cover 75ºC
in the exhaust manifold it is 175ºC
in the thermostat housing it is 61ºC

Two minutes later:
expansion tank 70ºC
valve cover 76ºC
exhaust manifold 115ºC
thermostat housing 70ºC

another two minutes later:
expansion tank 75ºC
valve cover 78ºC
exhaust manifold 98ºC
thermostat housing 81ºC

TBC...

 

[eriknetherlands]

Interesting investigations.
Hot water rises to the high points?

 

[deQuincey]

Interesting investigations.
Hot water rises to the high points?

water was normal at dash needle

 

[deQuincey]

today one step beyond,

operating engine after drive, warm

exhaust manifolds 230ºC both same temp

valve cover 66ºC

thermostat housing 75ºC

 

[deQuincey]

here you are more details:

 

[deQuincey]

exhaust manifold temperature,

It surprised me, because I expected it to be higher; And maybe it is at higher revolutions?

but at idle, the exhaust manifolds are at 230ºC

So at what temperature are the gases? I find a lot of information that talks about 800 and even 1000 degrees, well there is one that says 2000, but given the sober nature of his argument (or rather the absence of it) I don't take it into account.

finally I find this: Gasoline The chemical structure of gasoline is not as heavy as the structure of diesel, resulting in a fuel that burns in a lower temperature range. Under atmospheric conditions, the stoichiometric combustion of gasoline produces a temperature range between 371 ºC and 593 ºC.


comments ?