Warm up the engine.

[grafspee]

My wish is to implement the need to use increased throttle opening for cold engine. So after start up i would need to open throttle more to get 1000rpm then at warm engine.

Engine drives enormous gearbox for superchargers, hydraulic pump, which will require a lot more power from engine at cold state, so when engine warms up, rpm should climb if throttle not touched. Unless there is some idle rpm regulator which ads power to maintain minimum rpm which i dont know so far.

You could go even further and allow engine to just dies if too low throttle is used at cold state.

Edited July 4, 2021 by grafspee

[hazzer]

+1 especially leaving the rpm with a fully closed throttle. In lots of aircraft this will fowl the mags and if just after starting the engine will fail. 

[=475FG= Dawger]

The last thing anyone would do with cold oil is push the throttle up. The throttle stays in idle until the oil pressure drops significantly. If the engine won’t run in idle, its too damn cold and the oil needs to be warmed up outside the aircraft or the entire engine preheated , poured in and the engine started immediately. 

Edited July 6, 2021 by pmiceli

[grafspee]

11 hours ago, pmiceli said:

The last thing anyone would do with cold oil is push the throttle up. The throttle stays in idle until the oil pressure drops significantly. If the engine won’t run in idle, its too damn cold and the oil needs to be warmed up outside the aircraft or the entire engine preheated , poured in and the engine started immediately. 

 

But with cold engine if you cut throttle to idle it will die, so you need to add more then at warm state.

It ends up that engine's rpm will slowly creep high while engine is warmer and warmer.

As far as i know, those engines does not have any idle rpm guard, so pilot has to do it by him self.

Im not talking about sub freezing starts up, even at 25-30c you will notice it.

 

Edited July 6, 2021 by grafspee

[=475FG= Dawger]

3 hours ago, grafspee said:

But with cold engine if you cut throttle to idle it will die, so you need to add more then at warm state.

It ends up that engine's rpm will slowly creep high while engine is warmer and warmer.

As far as i know, those engines does not have any idle rpm guard, so pilot has to do it by him self.

Im not talking about sub freezing starts up, even at 25-30c you will notice it.

 

 

What are you basing this idea that an engine won’t run at idle on?

Edited July 6, 2021 by pmiceli

[grafspee]

2 hours ago, pmiceli said:

What are you basing this idea that an engine won’t run at idle on?

 

It wont, idle throttle position is set for warm engine, to have as low as possible power, useful in landings etc.

But when engine is cold oil is cold it require from engine more power for same rpm.

Watch this, as you notcie engine rpm creep up as engine warms up and he does not touch thorttle.

Don't watch rpm gauge looks line not in best shape but listen to the engine.

If you have fixed throttle position in the intake there is no way that engine's rpm would stay the same while warming up.

Edited July 6, 2021 by grafspee

[=475FG= Dawger]

The engine runs just fine in idle in the video. He just pushed the throttle up because he was in a hurry. It obviously isn’t cold outside. 

[grafspee]

He pushed throttle, but engine rpm was increasing while warming up, not much, just like said even at 25-30 you will notice the difference.

Just after he set throttle engine was running at lower rpm then 1-2 minutes later.

 

Edited July 7, 2021 by grafspee

[hazzer]

With most piston engined aircraft idle (throttle back) is around 600-800rpm. It is not standard practice to start the engine and leave the throttle in that position as it leads to rough running and mag fowling etc. Standard in most aircraft is to set rpm to 1000-1200rpm till the oil temp rises. When taxying, yes you would probably need to idle the engine to taxi at the appropriate speed, so you would have to bring the throttle up every now an then to avoid such issues. 

 

Hope this helps.

[grafspee]

What i am asking is to implement different throttle position required for example 1000rpm at cold engine and warm engine. For cold engine throttle need to be advanced further then for warmed up engine.

Yes engine will die if you cut throttle at very low temp.

If plane is operated at very low temps way below 0C you just dilute oil before every shut down, and oil pressure is no issue.

And you definitely don't want to warm up engine at idle rpm.

That 600 rpm idle is only for landing purpose, to reduce engine thrust at idle rpm, if it was set to safe 900-1000rpm landing roll out would be longer.

Other then that 900-1000 is your safe idle rpm 

 

Edited July 8, 2021 by grafspee