25 engine problems

[RickBrinker]

The engine runs fine at idle starts breaking up at 25-30 coil is new, points are in good condition and so are the plugs.never did this until I lost the timing when a changed the water pump shaft.Starts right up and smooths out when the spark is at full advance.I'm lost.Could I put a dwell meter on this.

[MikeC5]

Have you verified TDC (with the mark on the flywheel) vs. rotor position? Does this only happen after it is warmed up?

[JACK M]

Did you put the new coil (or condensor) on when you tuned it up? New does not always mean good.

[RickBrinker]

Had a new coil wound,and condenser updated

[RickBrinker]

Is there a way I can use a newer coil and condenser.I hate to spend 250.00 to have another coil wound and have it turn out to be something else.

[dwollam]

I just finished putting modern coils and condensors on my 24 and 25 coupes. I used a 60's-70's Ford 12 volt coils (internal resistors) and matching condensors. I removed the stock condensor and mounted the modern one on the outside of the dist. using a small screw and nut through the original condensor mounting hole. Both now run great, where as I was having issues before.

[RickBrinker]

My condenser has 2 wires ?

[MikeC5]

Yep you can use virtually any 12V 'modern' coil. By modern I mean the typical cylindrical can-type coil that you can buy at Autozone, Pep Boys, etc.

[MikeC5]

One of them has to be ground. Is it an original style?

[RickBrinker]

Yes one wire goes to the connection where it comes into the dist.and the other wire goes to the the one side of the points that doesn't have the arm

[dwollam]

That second wire is a ground. Not all of the stock condensors have 2 wires.

[RickBrinker]

Well I dressed the points again and took it for a drive just now it never missed a lick.Had the top down and ended up in a cloud burst man did I get wet !!!! Don't know what I did but it seems to be fine now.Thanks everyone. Rick & the Chicken

[MikeC5]

Great! Good that it was simple and cheap.

[RickBrinker]

Took it for a 20 mile drive today ran like a new one got 6 blocks from home started acting up again,left it sit with the hood up for 20 min started it made it home looked at the points again and they were starting to burn again pulled the condenser apart ( i had sent it off to be fixed once before it wasn't the same mf) going to mount a newer style on the outside and see how it does then.More to come.

[platt-deutsch]

Install a pertronix module in place of the points and plugs and your problem will be solved.

[RickBrinker]

I ordered a Pertronix module will see how that works out

[MikeC5]

I was looking at it on Jegs. Is it small enough to fit under the cap?

[platt-deutsch]

Yes it fits easily under the cap..
One other thing to check is the resistance of the primary of the coil. The 12 volt coil will have about 5 Ohms res. There is also a 6 volt coil that was used in I believe 26 or 27 when they switched to 6 volts that looked exactly the same but was 6 volt. It had a resistance of 2.5 Ohms on the primary. That would draw double the amperage at 12 volts and cause what you are describing. The coil should have 12 volt stamped on a washer on the top of the coil.