Anyone have spark plug gap recommendation for champion x plugs? 1917 runabout and mutt depot hack.
The Bible says 1/32" (.03125"). Some say .025" is better, but I go with the book.
Champion Spark Plug suggests .025" gap.
Picture saved from Dan T....Thanks !
I run repo x plug @ 25 - 30" on all of my Ts.
The spark plug manufacturer recommends .025".
The vehicle manufacturer recommends 1/32" (.03125).
Many folks here gap their plugs at .030", or .032", or even up to .035". and are quite satisfied with the results.
Why don't you try all of the above listed settings and find out what works best in YOUR engine as some are happier with one particular gap more than another.
It is a bit like a marriage in that what works in one household (or in this case-under the hood) may not work so well elsewhere. Good luck with your project, Bill
Bill Harper's got the best idea, try different gaps between .025 and .035 and see where yours runs best. Me it's .032-.035
Condition of coils and whether running on battery or magneto may affect the gap you use.
And the fellows do not mean try a different gap on all four cylinders at the same time!
LOL I was thinking about someone doing that as I posted!
Thank you all very much.
I would be interested in hearing the results if anyone does do the gap performance comparison test. Should be some relatively easy scientific method combined with seat of the pants measurements? Or perhaps some out there could do some more refined measurements????
Selfishly, I am most interested in such a test being performed with the stock Ford coil setup instead of modernised "improvements".
I wonder if perhaps the fact that the early T's had a higher compression head would have then used the .025 gap which is electrically about the same gap as .03125 with the later and slightly lower compression head. Just my musing here - not stating a fact in evidence or proof of anything.
Years ago, I read somewhere one thin dime!
The reproduction Champion X wrapper says it all..... and recommended by their engineers for a gap of .025".
Why don't we use this as a fact and gap accordingly ??????
Try it, your engine will like it.
Our 1950 Buick Special, with a 6 volt system, used a spark plug gap of .025".
Used .025" gap on our '26 Runabout, started easier on battery and magneto, and had seat of the pants pep at speed to boot !
Chris Falkner.... was this helpful ???
I laughed out loud at the notion that something is "recommended by our engineers"!
I also know that in the 1950's, 4 out of 5 physicians preferred Camels!
Folks, gap 'em like you want to...different cars thrive on different gaps...it's highly unlikely that any engineer had any input to that little piece of advertising wrapped around the spark plug.
Engineers design stuff. Ad men sell it...and sell it by any means necessary. The LARGE font is especially impressive and carries more weight than regular font.
Scott: Believe what you want, .025" gap works for me.
What I believe is that most "T"s with healthy coils will run just fine on pretty much anything between .025 and .031", with a few "T"s being a bit particular one way or another.
As a retired aerospace systems engineer, what I know is that a large company, particularly a publicly held company, will sell, run, fly or say pretty much whatever management decides will be most profitable and not necessarily what the engineers recommend.
Not trying to pick fights or be smart about it. It just is what it is.
Very aware of the ways of the business world, didn't fall off the turnip truck yesterday.....
Scott: Believe what you want, .025" gap works for me.
Chris, I suggest you get some of those plugs with two benders; set one at twenty five and one at thirty. Mark the thirty gap side of your plugs and install them toward the front and preferably with the car parked toward magnetic north if you plan on running on mag. That's the best way. Trust me.
Sorry, Chris, I just reviewed your original post and now realize one of your vehicles is a depot hack. Better to go perpendicular to the camshaft on that one.
I don't think it is a coincidence engines with Champions set up with 0.025" gap, concentric CAM shaft / timer alignment and coils set up for the same dwell time to fire consistently run exceptionally well.
In my opinion, stuff Engineers design well tends to sell themselves. Problems often arise when users fail to follow directions. Yes, other random combinations of the same variables involved MAY achieve acceptable results but doing so on a consistent basis typically proves to be elusive. Sound familiar? When all else fails, follow the directions.
(Message edited by mkossor on August 29, 2017)
I run Champion X plugs set at 25. My feeble attempt at humor was an effort to change the tone of the thread which I felt was getting a little prickly. As they too often do.
Damn right John !! And with good reason. Ain't nobody gonna tell ME to read directions !! Why, readin' a manual is just like cheatin' !!
Happy 1 year forum anniversary Rich.
Wow !! A year already ?! ? Thanks, Vern !! It's been a very happy year, I love this place ! (and It only took me eight weeks to go from " just reading" to driving a T again)
I,was always told, the gap should be the thickness of a thin dime.
I mean no disrespect to anyone on this forum, but I'd like to add that Champion Spark Plug sent Dad to Toledo back in the 1970's, for a technical seminar. It made a big impression on me, as Dad's shop was a one-man operation, and had been in business for 30 years at the time. They few dozens of sets of plugs he bought per year, surely did not warrant such extravagances. They flew him from Saginaw to Toledo and back on their jet. He told me about the great lengths the engineers went to, to design plugs. Remember the AMC 258 in-line six? Champion designed a special plug for them, with an extra long porcelain and center electrode. It improved driveability, horsepower, torque, and fuel mileage drastically. I thought it was space-age technology, when he told me about engineers reading the spark plug temperature of a motorcycle racing around the test track, through wireless communication. I'd follow the directions of the Champion engineers.
I personally wouldn't trust any gap setting as Gospel, just because its written on fancy paper. Just think about all the the different setups we use in the T community. Different heads, carbs, intakes, ignition systems etc. I installed them straight out of the box at .025, and my T ran like crap, opened them up to .030 and it ran beautifully. Definitely experiment with different settings to see what your T likes the best, you won't be disappointed.
Thank you Ed B. for sharing your father's learning experience.... learn something every day.