Dennis Plunkett wrote:
> In this case the rev limiter can cause the exhaust to be blow off
> when it gets filled  up with unburnt vapors (Then you may get some nasty law
> suits!)

Sounds good though :-) It's a good trick as long as you know how to weld
up mufflers.

I used my trusty ol' FJ ute as a guinea pig while developing the
software to test different times at missing sparks, and while I concede
that backfiring could be a problem, it won't occur unless the engine has
been off for at least a few seconds. I don't think it's worthwhile
debating the subject here, because there are too many engines out there
with different levels of performance, and I don't think there is a
single solution for all of them.

> One thing to do is retard the timing, thus reduce the engine power. Other
> options are to control the fuel in-take, but this is not as easy.

I've heard that retarding the ignition is not as good for the engine
either, especially at high RPM. I've tried to retard the ignition, but
unless you retard it a long way back, there is not much noticable
difference. Unless you know what you are doing, reducing fuel flow could
also be dangerous to the engine at high RPM.

I can't say exactly, but I've seen late model V6 engines trying to out
rev themselves, accidently of course :-), and it appears that the fuel
may be cut for short periods because the engine starts to sound like it
is 'motor boating'. This is probably an easy task for the engine
management system.

--
Best regards

Tony

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