I just got home from a week long tour with my T and started a post tour check. The front 2 plugs look like they are running in a rich mixture with fluffy black deposits. The back 2 look normal. The engine has a distributor, Z-head, straight through NH. The plugs are gaped to .035. Any thoughts on what to look for. Thanks, Steve
manifold leak on 3 and 4. due to an air leak you needed to set the carb up rich enough to fire 3 an 4 and that caused 1 and 2 to be rich.
Tighten or replace manifold gaskets.
Steve ; All model T's have the same problem,look at: [The Model T FordOwner the best of Murray Fahnesstock ] page 303-305 that tells you all.
I seem to remember some talk of those front cylinders running cooler due to the air coming in from the front. I put a sheet metal baffle in front ... secured by one of the manifold bolts and a head bolt ... and it did seem to help a little.
I seem to remember some talk of those front cylinders running cooler due to the air coming in from the front onto the cylinder head. I put a sheet metal baffle in front ... secured by one of the manifold bolts and a head bolt ... and it did seem to help a little.
Steve, I am working on a theory with no way to check-----I trashed a rotor from a dizzy from Germany----it lost continuity from the center to the end----after replacing with a NAPA rotor with solid metal from the center to the end my T fired up immediately. It was explained that the reason for resistance plugs was radio interference----if your rotor has resistance from the middle to the end can you check it with an ohm meter?
The design of the German rotor had a wire off the center down into epoxy then back up to the outer end.
Do you know the part number for the napa rotor?
Is the head gasket on right? If you put it in backwards, the front 2 clys will run cooler. Dan
As Mark Osterman was saying, The late RDRicks was always recommending the use of a thermostat to correct the issue and yes it is common/normal for one and two to be a little on the sooty side.
Here's my method.
Step 1. Put in new plugs
Step 2. As long as it runs well, never look at them again.