Having done thousands of Bug and Van Engines since the early 60.s //  I
always liked to have 140 or above for proper operation //  You can also find out
where your problem tis  by running what is known as a air test // you need to
purchase a threaded insert that fits into the plug threaded area  // it is the
same end as your compression gauge or you can use a compression hose and adapt
the gauge end to a male adapter for a quick release that mounts to the end of
a air hose  // your local parts stores should be able to help you with your
needs // You then need to bring up the cylinder that you wish to test to top
dead center // do the same for the other 3 // You will need to have a air
regulator on your air system starting at appox. 35lbs graudually increasing the
pressure till you hear AIR  //  Now you will have to remove the air intake boot to
listen to  the intake system  // open the throttle body the same as stepping
on the throttle at the pedal // If  you hear air in the throttle body area your
intake valve is leaking // If you hear air coming out the exhaust your
exhaust valve is leaking // Take off the oil fill cap and listen in that area //  if
so you have blowby which means your piston cylinder & rings  are bad  // last
is the mating area off the heads and cylinders  > Loose heads > bad gaskets >
notch burn in head or cylinder will allow compression or air to be realeased
in the head zone .  CAUTION You May Have more than one area leaking  // You
probably wont find this in any service manual so Book mark it  or Place it in
your favorites . If you have any questions feel free to give us a call to
discuss the procedures.
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                                               Don @ DVW