<VV> TDC

[N6nev at aol.com]

>I just tried (again) to locate the correct TDC, and I used  my
>
>compression gauge (actually borrowed from AutoZone, no charge)  to locate

>TDC.

>I noticed that compression spikes each time  the rotor passes #1, hitting
>about 50-60 lbs one time, and then 110-120  lbs the next time,
>alternating between the readings.  (I removed the  valve so it does not
hold the reading, as I watch the gauge)

>I'm  assuming that the low reading is the exhaust stroke, and the high
>reading  is compression ?

>This is a method I had not heard before, and I'm  wondering if it's valid
 
Yes it is valid method. that reading is normal, if your compression  should 
be 120lbs., you can except a reading of 50/80/100/120 in 4 compression  
strokes. there is no compression on the exhaust stroke.......    

Larry
retired auto shop owner
61  monza




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