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Kellym
Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ
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 Posted: Mon Apr 15, 2013 8:35 pm Post subject: Interesting weather flight to Lycoming Engine School in my |
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As an A&P I sure would not want to use your method on a warm or hot
Lycoming. Even on a cold Lycoming 3-4 secs of boost pump on to prime is
plenty.
When hot, you are pumping fuel into the cylinder, guaranteeing that it
is flooded. On a hot Lycoming there is NO fuel in the injection lines.
It has already boiled out and is either vapor in the manifold or
evaporated.
Flooding the engine washes oil off the cylinder walls. Excess fuel gets
in the oil. All bad for the engine life. Throttle 1/4" will take a long
time to clear the excess fuel.
Either don't put ANY fuel into the cylinder or go to wide open throttle
before cranking to clear the excess fuel quickly.
Boost pump on hot engine is only good on Continental injection systems
that have a return line to fuel tanks allowing cool fuel to be pumped
all the way through fuel lines and back to the tank. Bendix and similar
systems do not allow fuel flow that does not go into the cylinders.
On 4/15/2013 8:38 PM, Dave Saylor wrote:
| Quote: | this works for me, hot or cold. Consider this a universal method
for injected Lycs:
Full throttle, full mixture. That opens everything up as far as possible.
Boost pump on until the fuel pressure approaches peak. No need to
hold out for the final PSI, just watch for the rate of rise start to
taper off. Boost pump off. Allows fuel to fill the injector lines
without vapors.
Throttle back to 1/4" (just cracked). Mixture to ICO. At this point,
the cylinder charge is over-rich and probably won't ignite.
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_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
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Mauledriver(at)nc.rr.com
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| Posted: Tue Apr 16, 2013 5:24 am Post subject: Interesting weather flight to Lycoming Engine School in my |
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Yes, there was a short discussion that sounded like the discussion here. The class focused on maintenance rather than operational procedures though it covered plenty of both. Jim could only state that different installations may require different techniques.
I made two notes from the discussion.
1) Whatever technique used for starts, don't 'prime' during a hot start. By 'prime' I mean don't run boost pump and open mixture (and throttle) as you might on a cold start.
2) Don't start using WOT
On 4/15/2013 5:01 PM, lewgall(at)charter.net (lewgall(at)charter.net) wrote:
[quote] Hey Bill,
Did anyone ask Jim about hot engine starts on the IO-540? That has been addressed here, but with different styles from different folks. Just wondered if someone of his experience had a recommended technique.
Later, – Lew
[b]
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