REFLECTOR: new electronic ign.

Ronnie Brown romott at adelphia.net
Sat Jul 17 15:42:04 CDT 2004


I think the Laser is overpriced and is not that reliable.  I know of at
least two that have failed after not that many hours.  It will also fail to
back up with any loss of sensors (I believe CHT or EGT is monitored - if it
fails, then it goes to back up mode.)

You can and should be able to run a Lightspeed or Jeff Rose then replace it
with a Slick when you sell it and suffer no penalty.  It will be up to the
A&P that signs the engine off as being airworthy when it is installed in a
certified airplane.  Some will reject a certified engine as soon it is
installed on a homebuilt - some in the FAA feel this way.

Ronnie


----- Original Message -----
From: "KeithHallsten" <KeithHallsten at quiknet.com>
To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
Sent: Saturday, July 17, 2004 2:09 PM
Subject: Re: REFLECTOR: new electronic ign.


| Yes, the pistons on an IO-360 four or an IO-540 six are so large that you
| really need to start the flame front at more than one location to achieve
| full combustion.  So even if you had a perfectly reliable ignition, you
| would still want two spark plugs per cylinder.  However, it's pretty
| ridiculous to have fixed spark timing, regardless of rpm, altitude, or
| throttle setting.
|
| I want to keep my IO-540-D "certified" (sort of) so it will be easier to
| sell when a better engine alternative presents itself.  Therefore, I
| specified the LASAR electronically-controlled mag system.  My engine
should
| come out of Lycon's shop in about a month.  I'm not real impressed with
the
| price/performance ratio of the LASAR, but it seemed to be the best
| alternative under the circumstances.  It does have the advantage of
| defaulting to standard fixed-timing mag mode in the unlikely event of loss
| of electronic control.
|
| Keith Hallsten, XLFG a-building, Lincoln, CA
|
|
| ----- Original Message -----
| From: "Scott Derrick" <scott at tnstaafl.net>
| To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
| Sent: Saturday, July 17, 2004 10:15 AM
| Subject: Re: REFLECTOR: new electronic ign.
|
|
| > > Try and remember: you do not have two mags because they give better
| > > ignition that way - they give lousy ignition the day you install them,
| > > and go downhill from there. You have two mags because one of them is
| > > *certain* to fail. One electronic unit provides better ignition (saves
a
| >
| > While I agree that mags are much more failure prone than an EI and that
| > one of the reasons for two is redundency in case of failure.
| >
| > Mags have a lousy spark and you will not get full power with just one.
| > two are required.  Even with EI's two plugs will provide a more complete
| > burn and more power than one.
| >
| > Scott
| >
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|
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