I recently picked up 4 NOS AC 26 spark plugs to use as spares. They were factory set at 0.025 gap. For those who have used AC 26 plugs in their T's, what spark plug gap did you use?
Thanks,
Neal
AC 26 spark plug gap recommendations
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Mark Gregush
- Posts: 5370
- Joined: Sat Jan 05, 2019 1:57 pm
- First Name: Mark
- Last Name: Gregush
- * REQUIRED* Type and Year of Model Ts owned: 1925 cutdown PU, 1948 F2 Ford flat head 6 pickup 3 speed
- Location: Portland Or
- Board Member Since: 1999
Re: AC 26 spark plug gap recommendations
.030-.032, running coils and magneto with AC's (I would have to check the number on mine), same as Champions or any other plug. Some people like the narrower gap others like wider. Start at .025 and see how your car runs, cars are all different re what gap they like. A lot depends on how hot or cold the 26's are and your engines requirements.
I know the voices aren't real but damn they have some good ideas! 
1925 Cut down pickup
1948 Ford F2 pickup
1925 Cut down pickup
1948 Ford F2 pickup
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Original Smith
- Posts: 3699
- Joined: Tue Jan 08, 2019 10:43 am
- First Name: Larry
- Last Name: Smith
- * REQUIRED* Type and Year of Model Ts owned: 13 Touring, 13 Roadster, 17 Coupelet, 25 Roadster P/U
- Location: Lomita, California
- MTFCA Life Member: YES
Re: AC 26 spark plug gap recommendations
I've been running 26's for years. Same gap as an X.