Just saw this package deal on tbay.
Nice piece. Fortunately I can up with a much cheaper solution for a dual plug spark
Just remember for those younger folks we will be able to tell our kids in 30 years. I saw one of those way back and it was "only" x amount.
Can you share your progress on your twin spark setup? I have a BB and BBR Rajo that use twin spark. Given what I spent on those two heads, I will have to pass on any exotic vintage twin spark units.
I have the Nissan twin spark distributor but that's it.
Sure. I added the Nissan cap and Rotor to a new Bosch plate distributor. A quite simple machining job and certainly I could provide pictures. My stroke of luck was realizing that Onan 2 cylinder engines have a coil specially designed to fire 2 plugs at the same time. It's not cheap but is readily available. I've also heard that Koehler might also have a similar coil, but I can't attest to it's suitability.
And please understand that these coils are constructed differently internally than the ordinary coil. The two high tension connections come from opposite ends of the winding
I have recently purchased a Fronty model t racing engine with dual spark. The builder used a 28 Nash 8 cylinder distributor for spark to 8 plugs. These are often available at swap meets. Sort of a cheap way to obtain dual spark for 8 plugs.
More info on the actual " mechanics " of the system please
Two sets of points ?
I have one of those on an SR Frontenac and yes I have two different manifolds, a single and a dual.
Otherwise I don't see how a 8 cylinder distributor could fire the 2 plugs per cylinder at the same time. Easily it could "fake" the action!!! I'm waiting to be educated. Always wanting to learn
I also have a Bosch front plate (purchased from Bruce McCalley) and a pretty good idea of the machine work needed to adapt the Nissan distributor. However, I would love to see your method of adapting the Nissan cap to the Bosch distributor.
Can you provide details on the Onan coil? What is the part number? How do you wire it to the Nissan cap?
I remember seeing Sherman twin spark heads on some speedsters on the Santa Clara run back in the '70s. As a teenager, I was too busy looking at the OHV T engines to pay attention to the ignition on some old flathead!
Franks setup has the Stutz caps on it. The one on E-bay has what appears to be 4cyl jeep caps on it.
Sure I'll try to take some pictures tomorrow
Here's what I ended up using having not been able to locate OR afford a Bosch twin fire magneto from the period at the time of the build near 30 years ago. Early 80's Datsun Z car, I believe - been too long !
RE: 28 Nash 8 cylinder distributor for spark to 8 plugs
We have a couple of those at the shop, I'll have to take a look inside to see how it fires. I've heard of them being used but never gave it much thought. If the contacts are close together and only have single contact on rotor would it be that the would be a delay in firing the second plug
with each pair of wires placed next to each other?
Re;The two high tension connections come from opposite ends of the winding
Little off topic' The model 72 Maytag twin cylinder engines fired the same way, the high tension leads came off the ends, scavenger firing.
Harley Davidson has two ended secondary leads, probably expensive, though. Dave in Bellingham, WA
The Nash distributor uses a 4 lobe cam with the 2nd set of points offset 45 degrees so that each end of the rotor fires every other plug. The rotors in these distributors have the two tips 180 degrees apart. This setup uses 1 coil to fire 4 cylinders and a 2nd separate coil to fire the remaining 4 cylinders. They can be converted to fire a twin spark 4 cylinder engine with each coil firing 1 bank of plugs.
Thank you Dan.
rotor box with part number. I bought all of these items from local parts store stock
customized Bosch distributor
other side of cap adapter
cap box with part number
Onan coil box with part number
I hope this helps
Harley davidson used simultaneous coils too--- used one on a 10 buick 2cyl
I use two Harley Davidson Accel iginition coils in my 2 cylinder REO. My REO custom iginition fires two plugs per cylinder. I also use one OEM Harley Davidson coil for our 2 cylinder Buick. With the Buick it is a "Lost Spark" set up and works well and simple using one set of points.
The Harley coils come in several coil resistances....depending if you are using points or a solid state iginition.
I will provide lots of photos as soon as I pick my engine up on the way home from Bakersfield swap meet.
My Fronty engine comes with a really cool speedster body, a ruxstel, 2 really nice early brass radiators, a bunch of neat T parts and some regular T parts from an estate in central Cali.