No, I did ot, Dene. When we rigged the new engine, all the setting and
timing was done by a friend of mine (Norman Stapelberg, from Springs,
South Africa).
We ran the engine at maximum static RPM (that is about 3000 RPM), and we
set both ignitions at 25 degrees BTDC, that's all I can remember.
Serge Vidal
KR2 "Kilimanjaro Cloud"
Paris, France
"AVLEC" <av...@telkomsa.net>
Envoyé par : krnet-boun...@mylist.net
29/12/2005 19:23
Veuillez répondre à KRnet
Remis le : 29/12/2005 19:14
Pour : <brokerpilot9...@earthlink.net>, "KRnet" <kr...@mylist.net>
cc : (ccc : Serge VIDAL/DNSA/SAGEM)
Objet : Re: KR> Timing retard
Good info Colin, I will definately keep that post for future refrence. I
had
no idea that you could not just leave off one plug lead and use just the
other(never tried it and probably never will). Is it possible to use the
same system to fire single output coils on say a five cylinder engine.
Each
cylinder would act independantly with its own ignition system. The five
pickups
would also have to be spaced at 72deg apart. I would imagine that this
applies to any engine with any number of cylinders.( There's a thought.
Six
independant ignitions on a six cylinder corvair motor). These new
generation
auto coils are really small so the weight penalty would be minimal. You
seem
to know lots about this so what do you think, would it work?
Serge, have you ever timed the motor with a timing light to see what the
idle timing is and how much advance you get out of it at what RPM. At what
RPM does it reach max advance?
Regards
Dene Collett
KR2SRT builder
South africa
Whisper assembler
See: www.whisperaircraft.com
mailto: av...@telkomsa.net
----- Original Message -----
From: "Colin Rainey" <brokerpilot9...@earthlink.net>
To: <kr...@mylist.net>
Sent: Wednesday, December 28, 2005 17:29
>
> Problem: aviation carbs have no hookups for vacuum signals on their
carbs.
This is the reason I am using a down draft Rochester Monojet carb. It has
both ported (vacuum on acceleration only) and manifold vacuum (vacuum at
constant rpm). If you do not use vacuum advance , then you will have to
recurve your distributor like WW does, and watch your temps closely. You
will not be able to allow your engine to get as hot as the car did due to
the effect on pre-ignition and detonation that this has, and you will
almost
assuredly have to use 100LL. Premium fuel will not give enough detonation
protection. Remember, these engines were designed when 100 octane fuel
(with
lead) was common at the pump, and were designed for its use. When the
lead
went away, timing had to better controlled, some cars even equipped with
spark retard modules, and compression ratios dropped until advancements
were
made it overall computer/engine control.
>
> Oh that "relay" is probably a simple transistor module triggering the
coil, which is what most electronic ignitions use. The other parts of the
ignition module handle ignition impulse modification if needed for
computer
use, and advance if desired by the designer. Since it is set up as an
on/off
system, it is perfectly compatible with the computer, where the trigger
from
say a point set tends to linger to a computer which makes it more like an
AC
wave, instead of the needed digital wave (square wave), but that is all
another story...
>
> Back to sanding my cowling....
>
>
> Colin Rainey
> brokerpilot9...@earthlink.net
> _______________________________________
> Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp
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>
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