Help Me With My Hot Start Technique (or Lack Thereof)

[Shadrach]

10 hours ago, ArtVandelay said:

This is overly complicated:

If you Set RPMs to 1200 when you shut down the engine, then it’s:

1. Crank and add mixture when it catches.

If it doesn’t seem to want to start after 30 seconds, give the starter time to cool and then do a flooded start.

Shutdown RPM really does not matter that much...anything around 1000 +/- several hundred will work.  It really isn't a precise procedure.  In a proper state of tune these engines will fire off pretty easily with a fairly broad range of fuel/air mixtures.

[JohnB]

The best hot start technique I've seen is well documented on Don Maxwells Hot start video

Hot Start Technique M20J

 

I had an issue with this my early days of owning my airplane as with my airplane I only get 2-3 good tries to start per battery then no more, and I didn't want to get stuck somewhere without a jump possibility, and multiple tries wear down your battery and starter, so I installed a slick start magneto booster, which allows starts even with suboptimal air fuel mixture. 

Slick Start Mag Booster

 

With Don's technique above and slick start, my airplane starts ridiculously easily, hot or cold.

 

[donkaye]

My new hot start method:

1. Remove Left Mag

2. Replace with SureFly SIM

3. Start like a cold start.

 

[midlifeflyer]

4 hours ago, donkaye said:

My new hot start method:

1. Remove Left Mag

2. Replace with SureFly SIM

3. Start like a cold start.

 

 We had a DA40NG in my flying club for a while. That’s the JetA diesel model. I loved discussing the special hot start procedure during checkouts: turn the key.

[RCBass]

This is a great thread, my 67 F... used to be I would start up, taxi to the fuel pumps, shut down at 1100 rpm, not touch anything, and it would fire on about the 4th or 5th turn, slowly advance mixture, pretty easy. But, if I flew say 20 minutes to another airport to get fuel, that technique wouldn't work. Seems like I would have to do WOT, mixture cutoff, and crank until it caught. Now, lately, if I fly it for an hour, shut down at 1100 rpm, wait 10 minutes, and try to start it, I advance the throttle like a quarter inch, crank, and it catches on the 4th or 5th turn. But now if I taxi it to the fuel pump, I can't get it restarted. Tried not touching anything, priming, WOT w/ mixture cutoff, nothing worked. I don't get why it changed. I'm going to make some notes on some of these comments and try them.