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The 15-20 deg split is what is stock in the Rx7
automobile., Tracy essentially eliminated that split. The problem
with the split is that experience has shown that if you lose your leading
ignition the POWER falls over very considerably (estimates vary but 20-30% are
numbers bandy around). Perhaps not too bad in an auto where you seldom
need over 20-25%, but of course a different story in aircraft.
I do not doubt that you get better combustion
efficiency by having the split. The Mazda engineers must have gone to the
split for a non-casual reason probably regarding efficiency (that is a long
combustion chamber) and emissions. However, giving up 20-30% power should
the lead ignition fails was a decision that I believe Tracy made correctly - for
aircraft use.
Yes, I have chatted with Leon quite a bit in the
past. Not much for the last couple of months though for obvious
reasons. But, I certainly know of no one who can match Leon's experience
and knowledge with the rotary particularly at the more technical end of
things.
Ed
Ed Anderson
RV-6A N494BW Rotary Powered
Matthews, NC
----- Original Message -----
Sent: Friday, July 30, 2004 6:12 PM
Subject: [FlyRotary] Re: Turbo and the
EC2
It could be that since with
boost you have higher combustion chamber pressure which supposedly leads to
faster
As you know, Leon's only
just now coming back "on cam" from his illness. He didn't go into why, but he did say
that there HAS to be a 15 - 20 split between leading and trailing to make
the mixture burn properly. He's already persuaded at least one ECU
manufacturer to incorporate this feature. He says that otherwise you will
"scatter" your engine. Gotta love the aussie language.
:).
Leon
know so much he leaves me in the dust a bit. I understand that you (Ed) have
had various conversations with Leon in the past. Perhaps it would help if you
got him to explain this stuff to you, then maybe relay it to Tracy for the
good of all.
John
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