compression test

Posted by Janicholson on October 12, 2006 at 12:11:12 from (199.17.6.122):

In Reply to: What steps to take for increased Power on my H posted by neblinc on October 12, 2006 at 11:42:50:

Compression Testing:
All plugs out
battery charged fully
good compression tester
Neutral
Ign off
Helper
With the gauge in #1 sparkplug hole, Crank the engine through 7 compression cycles on that cylinder. Read gauge and write down #
repeat for all cylinders.
If distillate engine expect about 95 to 110 psi
If gasoline "X1" suffex expect 125 to 130
if rebuilt and dome pistons or High altitude, expect more.
If Low
Squirt three oilcan squrts of engine oil into each cylinder. Spin engine with starter to distribute the oil.
Recheck compression as above.
If way higher the rings may need to be replaced.
if the same, and uniform, it may be the compression it has.
If more than 10 to 15 PSI different, it probably needs a valve grind and guide service.

Check the ignition timing before any teardown, ignition timing is a very important item, and can include the advance mechanism in the distributor as well as the static timing.
Good luck, JimN

Replies:

• Re: compression test teddy52food 06:16:57 10/13/06 (1)
  • Re: compression test Janicholson 13:26:19 10/13/06 (0)

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