mjlj on an Onan twin 10hp generator

SonoraMike · Post by **SonoraMike** » Sat Dec 22, 2007 5:12 am

I see that I can run EDIS wasted spark on a 2cyl motor. wondering how I might go about this setup:

10hp opposed twin with huge flywheel, no idea how a trigger wheel might mount
currently running a marvel vr60 gas carb, love to go EFI
dual spark coil running with points/condenser setup
runs all day long at 1800 rpm

photos of my unit here: http://www.smokstak.com/forum/showthread.php?t=43437

the current electronic ignition solution for this generator is a pertronics 1181 unit with a single magnet firing at 19*, info with photos here: http://www.kodakgallery.com/Slideshow.j ... nn_speed=1

I'd like to run EDIS-4 w/wasted spark -- no idea how I could easily mount a 36-1 but I'll worry about that later

Suggestions?

Post by **brentp** » Sat Dec 22, 2007 5:52 am

since it's a generator application with fixed RPM, is the advance fixed as well?

A couple of advantages with a crank fired / wasted spark setup is

a) since the coils discharge 1/2 as often, the longer available dwell period time provides better spark at higher RPMs;
b) superior timing accuracy under varying engine conditions.

Since you're running 1800RPM, you have lots of dwell time with the distributor setup, so your sparks should be nice and healthy already.

So we can advise better, what specific gains are you looking for with a crank fired setup?

Best regards,

SonoraMike · Post by **SonoraMike** » Sat Dec 22, 2007 3:17 pm

brentp wrote:since it's a generator application with fixed RPM, is the advance fixed as well?

yes, fixed advance at 19*. some have found fuel/performance benefits in the 21* area but in the end its still fixed with no advance

brentp wrote:So we can advise better, what specific gains are you looking for with a crank fired setup?

uber hot spark - solid, spot on timing - the ability to remove the stock ignition system, as it can be expensive to maintain/repair and tough to find parts for.

Post by **brentp** » Sat Dec 22, 2007 6:31 pm

Agree the crank fired ignition will be more reliable!

I suppose for a trigger wheel your obvious choices are to fix a timing wheel to the face of the flywheel- perhaps with the teeth bent outwards at 90 degrees, to avoid mounting the sensor near the flywheel; or mounting the timing wheel on the opposite side of the engine. Or, you could machine a pattern into the flywheel- but from the pictures that seems a little tough.

Regards,