I enjoyed viewing the pictures of the Ford Model N / R that was recently sold in the classified section of the forum. I noticed the engine had two spark plugs per cylinder. Not being familiar with these cars, can someone explain to me how that works? Thank you.
OT Question about Model N, R, S
Forum rules
If you need help logging in, or have question about how something works, use the Support forum located here Support Forum
Complete set of Forum Rules Forum Rules
If you need help logging in, or have question about how something works, use the Support forum located here Support Forum
Complete set of Forum Rules Forum Rules
-
Topic author - Posts: 472
- Joined: Sun Jan 06, 2019 8:15 pm
- First Name: Wayne
- Last Name: Jorgensen
- * REQUIRED* Type and Year of Model Ts owned: 1915 Runabout, 1918 Runabout
- Location: Batavia, IL
- MTFCA Number: 31697
- MTFCI Number: 23399
- Board Member Since: 2013
OT Question about Model N, R, S
Wayne Jorgensen, Batavia, IL
1915 Runabout
1918 Runabout
1915 Runabout
1918 Runabout
-
- Posts: 6798
- Joined: Fri Jan 04, 2019 10:51 am
- First Name: Richard
- Last Name: Eagle
- * REQUIRED* Type and Year of Model Ts owned: 1909 TR 1914 TR 1915 Rd 1920 Spdstr 1922 Coupe 1925 Tudor
- Location: Idaho Falls, ID
- MTFCA Number: 1219
- Contact:
Re: OT Question about Model N, R, S
One set is fired by the external magneto mounted to the left and one set is fired by the coils as was standard. The extra set of plugs are simply in threaded plugs in the valve access holes which normally don't have the threaded hole. It looks like ample room for the Bosch magneto to be installed. Whether both systems are used at the same time or used singly depends on how they are set up. Nice photo. I hadn't seen it.
Rich
Rich
When did I do that?
-
Topic author - Posts: 472
- Joined: Sun Jan 06, 2019 8:15 pm
- First Name: Wayne
- Last Name: Jorgensen
- * REQUIRED* Type and Year of Model Ts owned: 1915 Runabout, 1918 Runabout
- Location: Batavia, IL
- MTFCA Number: 31697
- MTFCI Number: 23399
- Board Member Since: 2013
Re: OT Question about Model N, R, S
So are you saying that Models N, R, & S left the factory with only one spark plug per cylinder?
Wayne Jorgensen, Batavia, IL
1915 Runabout
1918 Runabout
1915 Runabout
1918 Runabout
-
- Posts: 6798
- Joined: Fri Jan 04, 2019 10:51 am
- First Name: Richard
- Last Name: Eagle
- * REQUIRED* Type and Year of Model Ts owned: 1909 TR 1914 TR 1915 Rd 1920 Spdstr 1922 Coupe 1925 Tudor
- Location: Idaho Falls, ID
- MTFCA Number: 1219
- Contact:
Re: OT Question about Model N, R, S
Yes, as far as I know. A box of coils fired by battery.
When did I do that?
-
Topic author - Posts: 472
- Joined: Sun Jan 06, 2019 8:15 pm
- First Name: Wayne
- Last Name: Jorgensen
- * REQUIRED* Type and Year of Model Ts owned: 1915 Runabout, 1918 Runabout
- Location: Batavia, IL
- MTFCA Number: 31697
- MTFCI Number: 23399
- Board Member Since: 2013
Re: OT Question about Model N, R, S
Thank you for the explanation.
Wayne Jorgensen, Batavia, IL
1915 Runabout
1918 Runabout
1915 Runabout
1918 Runabout
-
- Posts: 3384
- Joined: Sun Jan 06, 2019 11:39 am
- First Name: Tim
- Last Name: Morsher
- * REQUIRED* Type and Year of Model Ts owned: 1925TT, 1926 Martin-Parry bodied wagon, 1927 mercury bodied speedster
- Location: Norwalk Ohio
Re: OT Question about Model N, R, S
The two holes in the head casting were used to machine the the valve seats. When it left ford, each head had a closed plug in one and a spark plug plug in the other. Through time, many owners added a priming petcock in the solid plug. That makes a nice look now, lotsa brass. You don’t see this pictured example much, but it would allow a battery ignition from the factory, and a separate magneto ignition. The dry cel battery ignition was a pain, ( it took 8, 4 to use and 4 to switch to when the first set died.) and some of the very earliest accessory ads i’ve seen is for accessory magneto ignitions for the NRS cars. Quite a few different types and brands were offered.