I recently purchased what is represented as a 1927 rolling chassis. I planned to use the engine and transmission in my Canadian 1915 touring while I overhaul the 1915 engine. The obvious differences are, of course, a starter and generator, but upon looking closely, I notice that the hog's head has bolts at the top with braces running diagonally to the transmission wings that I call motor mounts. The bolts on the top of the hog's head, attaching it to the engine block are not on my hog's head, and I have no diagonal braces on my 1915. Will my 1915 cowl and firewall fit with these braces in place?
The braces were added when the brake band was widened for better brakes. The 4 dip pan is also weaker and more prone to bend so the bolts and braces were added as well as the corner braces in the rear corners of the engine to hogs head under the crankcase. If you are using the 1915 engine, you won't have any way to bolt the hogs head to the engine or use the top diagonal braces. So you just use it as is. You will also notice that the hogs head has the hole for the pedal shaft in the location for the wide brake drum, so if you are using the earlier transmission, you need to use the 1915 hogs head.
You say you bought a rolling chassis. If it contains the 1927 engine and transmission, you can use them in the 1915. And you can use the diagonal braces as well. Only those who look for it will know the difference. Only thing which will not fit is the floorboards. The slots for the pedals are at a different spacing for the 1927, but that's only boards. You can replace them and save the old ones for such time as you install the 1915 engine and transmission.
You will also have a fit problem with using the later water outlet on a brass radiator. You will have to borrow the low outlet off your 15.
The high cylinder head won't clear the forward floor board or the dash shield on a '15. You will need to install the low head to avoid cutting the floor.
The crank pulley needs to be changed to allow the '15 fan to run at the right speed. You will need to use the '15 fan bracket too.
I want to thank all of you who gave me information. I am new to the Model T. I wanted this specific make, model and year since I was 13 years old. I was content with crank starting until I developed a minor heart problem.
Are there earlier model hog's heads with starter pads that would fit my 1918 without the need for modifications to the floor boards?
Any of the all-iron hogshead from 1919 to 1925 with the narrow pedals can be used.
Only the Improved Car hogshead, 1926-1927 model years require floorboards to match the wider pedal spacing.
Ifn you use the '19-'25 hogshead, you can't use the '27 transmission w/the wide brake band.
I think it might require some major modifications if I use the 1927 engine and transmission. The metal cowl rim that encloses my wooden firewall does not look as though it will clear the starter when held in position on the 1927 frame with the engine installed. Me thinks I'd better consider the conversion of my 1915 engine. Thanks to all of you who gave me advise and information.
Bob Coiro recently posted info about things he encountered using a starter-equipped engine in his '15. Maybe someone can post a link to that thread.