how do you test for leakdown?
Launching!
Joined: Apr 2002
Posts: 231
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From: Australia
Re: how do you test for leakdown? To test for leakdown, you need:
Air compressor
Leak down tester.
B&B or others make them, either a big single gauge or dual smaller gauges, they show from 0 to 100 %. (Leak)
You hook it up to the spark plug hole, connect to your compressor, set at the air pressure, get your piston on TDC first, and back off your rockers on that cylinder so both are closed. Off you go, it shows you leakdown. Once you've done that a bit, you can do other things too...
It shows you how well your cylinder is sealing, or leaking, as the case may be. Do it when the engine is fresh (new), then run a few passes, note the difference!! and then way down the track. Diagnoses problems. Unlike a compression tester, which is affected by comp' ratio, cam timing, etc, this gives you a real indication of how the cylinders/ are sealing. Do it hot and cold, play with it and learn. Professional engine builders use them all the time. VEERY usefull tool IMHO.
<img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
Air compressor
Leak down tester.
B&B or others make them, either a big single gauge or dual smaller gauges, they show from 0 to 100 %. (Leak)
You hook it up to the spark plug hole, connect to your compressor, set at the air pressure, get your piston on TDC first, and back off your rockers on that cylinder so both are closed. Off you go, it shows you leakdown. Once you've done that a bit, you can do other things too...
It shows you how well your cylinder is sealing, or leaking, as the case may be. Do it when the engine is fresh (new), then run a few passes, note the difference!! and then way down the track. Diagnoses problems. Unlike a compression tester, which is affected by comp' ratio, cam timing, etc, this gives you a real indication of how the cylinders/ are sealing. Do it hot and cold, play with it and learn. Professional engine builders use them all the time. VEERY usefull tool IMHO.
<img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
