is this the correct setup for a Z compression test

[sekkyoshi]

http://www.youtube.com/watch?v=F5dPWXiaRWA

[datzenmike]

Sure that will work. I got mine for about $30. The best ones screw in and hold the reading until manually released. (a good reading should be 3 times what he got)

[Npdavies.]

We got around 120 the first time before I reread the instructions.

It says completely depress the accelerator pedal and crank the engine for around 8 rotations.

And make sure your coil is disconnected.

 

But to answer your question, as Datzenmike did, yeah it looks right.

Good luck!

Hope your compression improves. :P

[ggzilla]

120 is OK, as long as all cylinders are within 15% of each other.

 

Some gauges read lower than others...

[sekkyoshi]

ok, thx! i wasnt sure if i had it set up right.

[ggzilla]

Setup:

1. Take out all spark plugs

2. Unplug the distributor or coil

 

Then just Crank it until the gauge stops going up. Usually takes 4 or 5 revolutions. Watch the gauge if possible.

 

You don't need to open the throttle, it makes no visible difference.

[racerx]

yeh, you don't need to open throtle, engine is not supposed to be running, just crank it like maybe 3x till you see the needle on the comp. tester stop. The screw in types are better, perhaps mroe accurate. I have both. I even think you don't need to take all of spark plugs off just one at a time.

[Sealik]

Actually.... having the throttle/choke wide open adds about 5 percent plus on the readings.

Every little bit helps... :D

Removing all the spark plugs is easier on the batt/starter....no compression to deal with

[racerx]

Okay will try that next time...