Roof OHV engine question

[misterNNL]

I am building a 12 speed model T Ford speedster with a Roof equipped overhead accessory head on the four cylinder engine and have a question.Where are the spark plugs located on these things.I have done quite a bit of net surfing with no luck.A photo Would be wonderful,but a always any help appreciated with the plug and wiring very helpful.Thanks as always.Art..are you there??

[misterNNL]

Sorry for the triple posting on this topic.My Kindle was working slowly and I kept hitting the post icon.

[Ace-Garageguy]

Look closely and you'll see the plugs just under the intake ports on the 101 Cyclone head.

Inside the chambers, you see the plug boss adjacent to the intake valve position (the exhaust valve is still in the block, and lives at the end of the projection from the chamber).

Edited May 15, 2017 by Ace-Garageguy

[Ace-Garageguy]

Sorry for the triple posting on this topic.My Kindle was working slowly and I kept hitting the post icon.

You can delete the other two thread  posts yourself.

[misterNNL]

Thanks Bill,the second engine in this build series will have RAJO head.Will the plugs be in similar position and do the plug wires start at a small block on the firewall like a stock model T?To be,honest I,don't,see,the plugs in that first photo,

[Ace-Garageguy]

To be,honest I,don't,see,the plugs in that first photo,

The insulators and top contact are visible on two plugs, sticking up at about a 45 degree angle, just under two of the intake runners.

Look just to the left of the "OOF" (look in in the red area next to it) on the lower right hand corner of the photo. You'll see the top of one plug.

Then look just above the polished runner that's immediately above the "OOF" in the photo (again, look in the red area). You'll see another plug insulator sticking out.

Edited May 15, 2017 by Ace-Garageguy

[Ace-Garageguy]

Thanks Bill,the second engine in this build series will have RAJO head.Will the plugs be in similar position and do the plug wires start at a small block on the firewall like a stock model T?

There were several different Rajo heads, including a DOHC unit. They could have been (and should have been for best performance) fired by an engine-driven magneto, rather than the old stock-style T ignition. (There were multiple Roof heads as well, but for the T engine, I'm not as familiar as I am with heads for the A engine).

This Rajo model 30 head (on a T engine) has a Wico magneto. The plug wires are readily visible, the mag drive is in front.

 

Edited May 15, 2017 by Ace-Garageguy

[misterNNL]

Fantastic link.It shows me exactly what I need to see.This will make my engine details more authentic.