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04-18-2011, 09:41 AM
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Join Date: Nov 2009
Location: Paris, France
Posts: 24
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hot start procedure
I am trying to figure out what my hot start procedure should be on my O-320 (fitted on my RV4) and perhaps you can help me out.
Yesterday, I tried to start my engine 5-6mns after having it off (with mags off rather than leaning as I intended to restart shortly), no priming, fuel pump on, ? inch throttle : it started for 1 second and then died. Couldn?t restart it.
5 mins later after ventilating the engine (mags off, fuel off, full throttle,10 turns of prop manually opposite) still nothing.
1hr later ventilating again, little bit of priming and it finally started.
Some guys told me that it is a fairly common feature: when the engine is switched off, the heat of the magnetos actually increases, sometimes to a level where they become inoperative. The heat of the engine would actually be transferred to the magnetos when they are no longer cooled by their special venting?Does this make sense?
What?s the best advice for carburetted O-320 hot start procedure?
Olivier, France
RV4, G-RVDP
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04-18-2011, 09:53 AM
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Join Date: Mar 2010
Location: USA
Posts: 454
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It died after a second because it flooded. If this happens, you can either wait a few minutes and try again, or if you want to save your starter, shut off the mags, pull the mixture, open the throttle fully, get out and pull the prop through about 10 blades. Then get back in the plane and start it normally, only open the throttle a little more than what you'd open it when doing a normal start. Just pull the throttle back as soon as it fires. If you have a separate starter button from the mags, you could also do this same routine from inside the airplane by cranking the engine a few blades with the throttle open before doing it with the mags on. In general for hot starts with a carb, you'll probably need to open your throttle a little more than for a cold start. If it starts and dies, then try as described above. If you have an integrated starter/mag switch, then you can do it from inside the plane, then just turn it over a few blades with the throttle open and the mixture out, then push the mixture in and hope it goes. 
Last edited by luddite42 : 04-18-2011 at 10:00 AM.
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04-18-2011, 09:57 AM
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Join Date: Jul 2007
Location: Warwickshire UK
Posts: 703
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That must be Dudley Patterson's old RV-4 - very nice.
My hot technique on a carburetted O-360 RV-4 is to set mixture to ICO and throttle wide open. When the engine fires move the mixture to rich and bring the throttle back. If it doesn't catch and run, you will have blown out most of the excess vapour and a normal cold start setting will probably work.
This technique always seems to work for me, but it assumes you are dealing with heat soak in the fuel lines etc and excess fuel vapour. I've not heard of heat problems with mags, but maybe worth checking mags, timing, wires and insulation etc.
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04-18-2011, 10:35 AM
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Join Date: Nov 2009
Location: Paris, France
Posts: 24
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Thx for replies and advices. So, if one's ennemy in hot starting is flooding, then it is silly to switch off with mags and one would be better off starving to ease re starting?
(Mark, yes, it's Dudley's, he's done a very nice job!)
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04-18-2011, 10:47 AM
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Join Date: Jan 2005
Location: Ridgetop, Tennessee
Posts: 134
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hot start procedure
Quote:
Originally Posted by fazlo
I am trying to figure out what my hot start procedure should be
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This has worked for me every try (so far).
1) Mixture off
2) Throttle idle
3) Fuel pump on for 5-10 seconds & then off
4) Throttle open 1/4"
5) Start prop turning with the starter and slowly push in the mixture....... When she likes it she'll start!
Also, you might check your Mag timing. Strangely enough, I have found that the closer to 25 deg BTDC and the closer to "in sync." my mags are the easier my engine is to start (hot or cold).
Hope this helps,
__________________
Tommy Walker
Ridgetop, TN (1M5)
RV-6A, N 350 TW
830 Hrs & "Climbing?!
Last edited by twsurveyor : 04-18-2011 at 11:00 AM.
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04-20-2011, 05:32 AM
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Join Date: Nov 2009
Location: Paris, France
Posts: 24
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Thanks Tommy
"pushing in slowly the mixture" : interesting way. Thanks
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11-30-2011, 02:53 PM
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Join Date: May 2005
Location: Brisbane Australia
Posts: 568
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Quote:
Originally Posted by twsurveyor
This has worked for me every try (so far).
1) Mixture off
2) Throttle idle
3) Fuel pump on for 5-10 seconds & then off
4) Throttle open 1/4"
5) Start prop turning with the starter and slowly push in the mixture....... When she likes it she'll start!
Also, you might check your Mag timing. Strangely enough, I have found that the closer to 25 deg BTDC and the closer to "in sync." my mags are the easier my engine is to start (hot or cold).
Hope this helps,
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Im going to give this one a try. I have always shut down with mixture to ICO.
On HOT restart, I would use full rich, boost pump on a few secs, then start to crank engine and pump the throttle in/out until it starts. This would work well for me on a cold start, Hot start 50/50.
Im going to try your 1/4 throttle and slowly move mixture in until it starts.
If that doesnt work, i guess i have boiling fuel or Heat soaked mags.
__________________
Jamie lee
Brisbane, Australia
RV7A - Now Flying.
0-360,carb,catto 3 blade.
VH-XJL
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09-11-2013, 12:18 PM
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Join Date: Nov 2009
Location: Paris, France
Posts: 24
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This "slowly pushing in mixture" trick for hot restart has never let me down since Tommy indicated it! (touch wood) Thank you very much!!!
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09-11-2013, 01:58 PM
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Join Date: Jan 2007
Location: Stuart, FL /Hartford, CT/Virgin Gorda,BVI
Posts: 3,122
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Quote:
Originally Posted by fazlo
This "slowly pushing in mixture" trick for hot restart has never let me down since Tommy indicated it! (touch wood) Thank you very much!!!
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Dito on this one also. It works.
__________________
TURBO YES =VAF= Payed Jan2019
Ed D'Arcy
RV6-A 5,200+ hrs, R-44 1,600 hrs, Helicycle 320 hrs, gyro sold,35,000 miles flown in 2015 
Stuart, Fl / S WINDSOR,Ct / Virgin Gorda, BVI - under major repair from hurricane damage
VAF #840 EAA AOPA FAC FABA QB SPA
addicted pickle ball player
https://i.postimg.cc/tn3h4svg/IMG-3101.jpg
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09-11-2013, 02:37 PM
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Join Date: Feb 2005
Location: Minneapolis
Posts: 2,473
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Just something I noticed here, but a few folks are talking about different things I think....proc's for Injected and Carb'd engines aren't necessarily the same at all. For example, running the fuel pump on a Carb will do little other than to maybe fill the bowl. Doing that on an injected engine puts fuel into the cylinders - unless you have a purge valve, then the process changes yet again, as it does depending on which injection system you have, which ignition you have, impulse couplings, starter, etc... This is sort of like the primer debates of old, each engine is sort of like a girl. You need to learn their individual nuances, because my experience with lyco's is that if one thing is absolute, it's that they all are different. Sure some general methods will help, but details will just need to be figured out.
I do know one rather famous RV driver who flies a lot of different airplanes...and his procedure for hot starts in an unkown plane is just to flood it, then start it from there because at least every time you know where you're starting from!
Just my worthless 2 cents as usual.
Cheers,
stein
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