Quote:
Originally Posted by maddog
High voltage to the coil for an inductive ignition is the worlds best kept secret.
Please elaborate, i.e what are the "right parts"
Coils : As far as I can tell a coil with a low turn ratio will reduce heat issues and put more amps in the spark which makes for a hotter spark. Tractor coils have a low turn ratio (60:1) and seem to be whats needed. Some coils are not suited and overheat but this is not an issue that cant be addressed.
Spark plugs: The common copper plug will wear quicker with a larger spark but now with so many different types of plugs around (i.e iridium, platinum, brisk halo) that are meant to last 100k km, even if they last 30k km with the stronger spark thats fine with me
Spark plug wires: I am just running a common spiral core and no problems. Dont know if they will break down quicker but there a plenty of options.
Distributor cap : I can see these wearing out quicker, especially the centre carbon post but it just means more frequent replacement or maybe using a brass post inplace of the carbon one.
What are the other considerations? The coil type is clearly the most important
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Hi Maddog,
I would like to answer your various excellent comments,
but will to do it after Wednesday, the 18th.
However, I will tackle one issue.
You are right, of course, that the culprit for lean burn is NOx.
But in Poulton's book, Chapter Lean-burn, 1994, Page 43,
we achieved 0.15 gm/mile using FTP-75 at an EPA recognized facility,
weighting the air-fuel mixture more with EGR than lean burn,
i.e. lean-burn at only light loads where fuel economy is worse.
We achieved 11% better fuel economy.
By the way, the NOx 2004 standard was 0.2 gm/mile.
While a powerful lean lean burn system cannot compete with a stoich car for NOx,
at above, say 0.4 MAP, it can go to stoich with very high EGR, e.g. 40%,
and can beat the pants off a standard stoich car for NOx.
Remember, NOx greatly increases with load.
Also, we have shown this with a homogeneous mixture,
i.e. a much simpler engine system.
All the best, Maddog. Michael