From: Noddy on

"Yvan" <me(a)> wrote in message

> Max mechanical advance at 2500 - 3000 rpm (on the ACL graph it's at
> ~2000 rpm) . OK.

As a ballpark figure. Most times you'd want all your timing in by 2500rpm,
but it would depend largely on the engine in question.


From: John McKenzie on
Yvan wrote:

> > One of the things mentioned in the old SA design book by Jay Storer
> > (it's a publisher that used to put out a bunch of peformance related
> > books - mostly USA based stuff) - on propane conversions, I remember
> > they suggested setting initial timing using a vacuum guage - whatever
> > showed the highest vacuum would be a good place start, or just a
> > couple of degrees short of that to make it easier to start esp when
> > cold.
> >
> > Generally whilst lpg likes less total advance, it can usually tolerate
> > that mechanical advance coming in a little earlier. I tend to find
> > around 2600rpm is about as low as you'd want max � advance to have come
> > in by. In some applications where the compression ratio is high
> > enough, you often find it might run better softening the mech advance
> > curve to come in by 3000rpm
> Max mechanical advance at 2500 - 3000 rpm (on the ACL graph it's at
> ~2000 rpm) . OK.

I think one of the reasons for that is that most lpg conversions are on
larger engines here. That doesn't mean we never do smaller engines, but
I think that's a factor in things - they are generally a little lower
revving, and make peak torque lower. It's a _trend_ I've noticed, but
it's not 100% universal.

> We have highway limit of 120 km/h, and I do not drive faster (usually :)
> I drive most of the time in the city traffic, and on the roads with a
> 60 - 80 km/h speed limit. Does that change anything? Or should I tune
> vacuum advance at 100 km/h regardless where I do most of my driving?
> All this (very helpfull) info I have to adapt for use with EDIS. It has
> programable 3D ignition map (I need laptop), and connection for a
> manifold vacuum for indication of engine load. Good thing about it is
> that I can change ignition timing while I drive :-)
> Again you have been very helpfull, thank you for your time.

Anytime - I hope you have a nice Christmas :)

John McKenzie

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From: Yvan on
Nedavno John McKenzie piše:

> I hope you have a nice Christmas

And merry Christmass to you too, and everyone in this group.

Our (Orthodox) church uses the Julian calendar (but official calendar is
the Gregorian calendar, it's December 23 here as in Australia), so we
have to wait until January 7th for our Christmass. And we also have
second New Year, festivities here lasts up to January 14th :-)

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From: Yvan on
Nedavno Toby Ponsenby piše:

> festivities here lasts up to January 14th :-)
> Round here, the hangovers last about that long...


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From: Yvan on
I am still searching for the informations on tuning ignition advance for
lpg, and I downloaded configuration software for the device I am going
to order, and few ignition maps to see some different setups (only for
petrol). There are some setups that are not logical (ignition advances
with load), but I discarded that, and concentrated at default ignition
map for petrol normally aspirated engine. It is the one on the top


The one at the bottom is what I made based on suggestions I got here,
and what I found on the Internet. I made max vac advance 4-5, it looks
to low to use 8-10 as it would be less advance at full throttle with
lpg than with petrol (in defalt petrol ignition map example, at the
link above).

Any comments, suggestions? Of course when I order, assemble and install
EDIS ignition, I will do the actual tuning, but perhaps I can start
with a best ignition map as possible.

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