Hot Start/ColdStart

[MBDiagMan]

I have been successful with my hot start procedures.  I had trouble after I had run the engine a couple of minutes then had to shut down.  Probably five minutes later I tried restarting the way I normally would start it cold.  I could never get it to hit one lick.  I then tried different things and it never hit a lick.  Assuming I have enough battery will it start when I try Wednesday morning?

[carusoam]

A couple of minutes of run time... call it a warm start...

A minimum amount of fuel needs to be introduced after you have pulled the mixture out to kill the engine...

The same amount of fuel needs to be put back...

I use the FF gauge... the line is empty so the FF shows 00... I add fuel using the electric fuel pump until it shows on the FF...

Probably one or two seconds...

It clearly isn’t a hot start... no fuel boiling...

It can’t be a cold start... because it was just running...

With the warm start... use just enough prime to let fuel get to the engine... no more or then it becomes a flooded start...

You might pull the mixture back some?

See if that makes sense...

PP thoughts only, not a mechanic...

Best regards,

-a-

[Ragsf15e]

Yes, it will start normally on Wednesday.

If I was in your original scenario, I would have done my hot start technique which is to leave the mixture in cutoff and not prime it.  Just crank.  In my opinion, there’s still fuel in the lines and engine from it just running and it will fire.  Maybe it’s warm, not hot like Anthony said, but don’t add more fuel.

Now, if that didn’t work, then nothing has changed and you could try a little prime.  If that doesn’t work, you can still do a flooded start.

If I’m ever unsure, even a tiny hesitant, I will try hot start, then normal, then flood it.  Always in that order because you can’t go back.

[EricJ]

In the in-between hot-start and cold-start conditions I've sometimes done a partial prime or very short prime to start and that has worked fine.   This is on a Lyc IO-360.

 

[MBDiagMan]

On 7/30/2019 at 1:42 PM, Ragsf15e said:

Yes, it will start normally on Wednesday.

If I was in your original scenario, I would have done my hot start technique which is to leave the mixture in cutoff and not prime it.  Just crank.  In my opinion, there’s still fuel in the lines and engine from it just running and it will fire.  Maybe it’s warm, not hot like Anthony said, but don’t add more fuel.

Now, if that didn’t work, then nothing has changed and you could try a little prime.  If that doesn’t work, you can still do a flooded start.

If I’m ever unsure, even a tiny hesitant, I will try hot start, then normal, then flood it.  Always in that order because you can’t go back.

You were right!  Once cold using the cold start procedure worked perfectly.  I learn something new every flight, even something new sometimes when I manage not to fly.  I learned that after two minutes running it can no longer be considered a cold engine.

[Ragsf15e]

Nice, you learned faster than me too!

My first time in that scenario I almost burned up my starter.  Got mad, climbed out of the airplane with 2 passengers, went inside, did 10 minutes of research on Mooney space, went back out and started it with my newly learned flooded technique.

My guiding principle since then has been cold start only if it’s sat overnight.  Otherwise hot start first.  If it catches on a hot start but you don’t get it started, you can try to prime it like a normal start, but you’re probably gonna end up flooded which is just fine if you have that technique.

Always learning and reading on Mooney Space!

[Yetti]

Cold start.

1. Throttle 1 inch open

2. Elec fuel pump on and open mixture

3. count to 6 aligators.

4. Close mixture.

5.  Turn off elect fuel pump

6. crank

7.  Advance mixture on pop.  Retard throttle

 

Hot start.  less than one to 2 hours depending on ambiant.

Throttle 1100 Rpm

Pull mixture to off.

Turn off all switches

Don't touch anything.

Crank

Slowly advance mixture on First pop.

 

Flooded.

Open Throttle all the way.

Crank.

Slowly add mixture.

For all mixture opens it only gets opened 1/3 to 1/2.

 

 

 

[PT20J]

For a warm start, it’s easy to get confused: too much fuel or not enough?

Start from a known condition, no fuel. Throttle, cracked, boost pump off, mixture ICO. Crank. If it doesn’t fire, keep cranking and slowly bring the mixture forward until it fires. 

Skip

 

[FloridaMan]

If you continue to have issues, upgrade to a slickstart system. If you have a slickstart system, check the connections on the module and the fuse. 

[M20F]

On 7/31/2019 at 8:53 PM, PT20J said:

For a warm start, it’s easy to get confused: too much fuel or not enough?

The secret to the hot start is when in doubt flood it.  Guaranteed to work every time. 

[n961jk]

Don Maxwell has a you tube video on hot starts. Works every time even after a 5 our flight. Shut it down, restart in 45 seconds.