Compression Problems?

mr.wwwiseman

New Member

Jul 29, 2013

3

0

1

Santa Cruz, California

Jul 29, 2013

#1

• Jul 29, 2013

• #1

I have a 1965 inline 6 260 engine that has been running a little rough. Spark plug 2 continually fouls. Plug 1 has 105-110 psi, 2 = 115-125 psi, 3 = 110 psi, 4 = 125 psi, 5= 115 psi, and 6 = 110 psi. I thought it might be that either oil was leaking around the piston rings or that one of the valves may be dirty and is not closing all the way but since #2 has higher compression than most doesn't that suggest against that? Car does not smoke or burn oil. Please help. Any solutions or tips on how high the compression should be are welcome. Thanks

 

woodsnake

15 Year Member

Jan 16, 2007

1,352

15

69

Hicksville, NY

Jul 29, 2013

#2

• Jul 29, 2013

• #2

Any oil in the water, or water in the oil?

 

rbohm

Founding Member

Apr 12, 2002

6,698

550

204

tucson,az

Jul 30, 2013

#3

• Jul 30, 2013

• #3

first that would be a 200. as for your compression readings, they are consistent, though perhaps a touch low. i would look to things like something in the ignition system or the fuel system requiring attention.

 

mr.wwwiseman

New Member

Jul 29, 2013

3

0

1

Santa Cruz, California

Jul 30, 2013

#4

• Jul 30, 2013

• #4

No water in the oil. Just recently regapped the points, put in a new capacitor, new starter cellinoid, and new starter cable. Could it possibly be something like a slight clog in a fuel filter?

 

woodsnake

15 Year Member

Jan 16, 2007

1,352

15

69

Hicksville, NY

Jul 30, 2013

#5

• Jul 30, 2013

• #5

Any idea how old the timing gear set is? That will cause a lot of hard to identify running conditions..

 

rbohm

Founding Member

Apr 12, 2002

6,698

550

204

tucson,az

Jul 31, 2013

#6

• Jul 31, 2013

• #6

mr.wwwiseman said:

No water in the oil. Just recently regapped the points, put in a new capacitor, new starter cellinoid, and new starter cable. Could it possibly be something like a slight clog in a fuel filter?

Click to expand...

check the dwell reading, i forget the factory spec, but it might be out of whack and that will cause rough running issues.

 

dennis112

15 Year Member

May 15, 2005

1,561

36

79

Amish Wonderland of Central PA.

Jul 31, 2013

#7

• Jul 31, 2013

• #7

I've found some very weak valve spring on the 200ci motors that I have had throughout the years. Some have allowed the compression to drop to next to nothing. You could literally compress them with your hands. The springs are cheap to replace if you have an overhead tool and a few feet of 1/8" nylon rope. A big PLUS is that you could replace the valve stem seals at the same time which might help eliminate plug fouling.

 

woodsnake

15 Year Member

Jan 16, 2007

1,352

15

69

Hicksville, NY

Jul 31, 2013

#8

• Jul 31, 2013

• #8

Is the exhaust system original? Could have issues relating from a clogged muffler. That happened to me, when I had my 65 I6....The point here being no air out, no good air in...