[Vwdiesel] Rabbit droppings # 133 ---- ( compression talk for beginners )

[H . Hagar.]

Bart Whinelanders  whining (just kidden)     ----kind of made me think
back to when I first got shown these tricks .

Us OLD geezers  are so used to think that it is simple and straight forward.

Now I realize that a compression test is a test open to interpretation.    So first lets
tell the beginners about the pressure.   ---- it is not absolute pressure.    it is psiG.

And the reading on the GAUGE   is just that a relative reading  -- that you must
learn to interpret.      All four the same ?  good news.  275 psi ?  kind of low.

But you are not done just yet ..    Do one hot   and then do one at the time after squirting in some HEAVY oil in cylinder. That will tell if it is Ring trubles or wear.It could be valves.

The heavyweigts in this forum are Loren, James Hansen and the flyboys . The biggest
problem for beginners is CRANKING SPEED.  ---- get her snapping real good.

Ask the Heavyweights how the pressure reading varies with RPM .  I never checked that
but think now that I will in the future. .   But remember copression Ratio ?  about 23 times
atmosphere ?     so we are praying for at least   14 times 23  =  322  PSI. .  I am getting
this gut feeling that the Whinelander express  may be ok ?   I think I would try
another gauge or at least test it for readings.  Anyways Bart   let us know how it all ends ?.

If you suspect the pump ?    use the other one for a while. To proof test the engine-

I said it here many times   USE  BOSCH glowplugs. the NEW type.   they were special
when they came out and they had a patent so they were the only game in town
a few years ago.   And yes you can use new type in the old systems. Do not use the Old style in the new systems.    Glowtime is the problem   --the new type has a ballast resistor
buildt right in and can be left on for 3 minutes at the time . Without burning out.

Price ?    maybe 15  to 20 dollars a piece.    Mine hardly ever burn out so I am not up to date
on pricing.   Yes I have lots of the old ones here that burned out.Some had complete
melt downs.  (2).

So why did BOSCH  completely re design the glow plugs ?   -----Smoking turbos when cold.

The new system uses afterglow ( glow after start)  the old type turned off as soon as you
hit the start switch.

I am talking about Old Rabbits mostly   77 to  84 .    

As one of the flyboys  I am leaning on my Leakdown tester a lot.   ----It tells me
all I want to now about the engine.  We use airpressure from a comprssor to
supply pressure to the Gauges   You will need two. .

I am passing on Val Christians warning  -----if you put oil in cylinder be careful it may
just fire up and give you a very very high reading.

When I lived in Quebec   ---I had an old US Army Jeep  with 5 psi compression..
gasser   ---and I was the only one that could start in town   when it was really cold.

St Camille de Bellshasse.?    Q.       Now I am in BC  for the last few laps.

Hagar.

PS :   That jeep was not exacty a Hummer ---but for hunting and fishing ? ---it was great.
incredible design.