Leak down test
#1
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Join Date: Aug 2002
Location: Atlanta
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Leak down test
HI
I just did a leak test on my 964, the numbers are
1.(8%) 2.(9%) 3.(6%) 4.(8%) 5.(8%) 6.(6%)
this was done just warm, did another cold and the numbers almost doubled.
the car has very good power and runs and idles very smooth
so what can I tell from these numbers??
Randal
I just did a leak test on my 964, the numbers are
1.(8%) 2.(9%) 3.(6%) 4.(8%) 5.(8%) 6.(6%)
this was done just warm, did another cold and the numbers almost doubled.
the car has very good power and runs and idles very smooth
so what can I tell from these numbers??
Randal
#2
It sounds like your engine is very healthy. The numbers should be close to each other (which they are), and the acceptable range is 5-15% (which all of them are within).
#4
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Martin;
Basically you are trying to pressurize your cylinders at TDC with air. As the air leaks out, a percentage is given of leakdown. The air will leak past your rings, valves and so forth. Snap On makes a nice gauge.
Basically you are trying to pressurize your cylinders at TDC with air. As the air leaks out, a percentage is given of leakdown. The air will leak past your rings, valves and so forth. Snap On makes a nice gauge.
#5
Rennlist Member
Snap On tool:
<a href="http://buy.snapon.com/catalog/main_xml.asp" target="_blank">Snap On UK site catalogue</a> - choose Diagnostic, then "Cylinder Leakage/Engine Vacuum/Fuel Pump Gauges And Tester" (The URL is too long for the script to work on this forum). £169 + vat.
<a href="http://buy.snapon.com/catalog/main_xml.asp" target="_blank">Snap On UK site catalogue</a> - choose Diagnostic, then "Cylinder Leakage/Engine Vacuum/Fuel Pump Gauges And Tester" (The URL is too long for the script to work on this forum). £169 + vat.
#7
Rennlist Member
</font><blockquote><font size="1" face="Verdana,Tahoma,Helvetica">quote:</font><hr /><font size="2" face="Verdana,Tahoma,Helvetica">Originally posted by Randal:
<strong>Rob
Will this tool also do a compression test?
Randal</strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Helvetica">No - but they also do a compression test tool for £118 ($198).
BTW, I'm just working on Kevin's comment that "Snap On makes a nice gauge"
<strong>Rob
Will this tool also do a compression test?
Randal</strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Helvetica">No - but they also do a compression test tool for £118 ($198).
BTW, I'm just working on Kevin's comment that "Snap On makes a nice gauge"
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#9
Three Wheelin'
</font><blockquote><font size="1" face="Verdana,Tahoma,Helvetica">quote:</font><hr /><font size="2" face="Verdana,Tahoma,Helvetica">Originally posted by johnfm:
<strong>You'll need a source of compressed air as well as the gauge, BTW.</strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Helvetica">Baked beans for tea? <img border="0" alt="[hiha]" title="" src="graemlins/roflmao.gif" />
<strong>You'll need a source of compressed air as well as the gauge, BTW.</strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Helvetica">Baked beans for tea? <img border="0" alt="[hiha]" title="" src="graemlins/roflmao.gif" />
#11
Rennlist Member
</font><blockquote><font size="1" face="Verdana,Tahoma,Helvetica">quote:</font><hr /><font size="2" face="Verdana,Tahoma,Helvetica">Originally posted by johnfm:
<strong>You'll need a source of compressed air as well as the gauge, BTW.</strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Helvetica">Good point! I thought that the cylinder/piston would develop the compression...
<strong>You'll need a source of compressed air as well as the gauge, BTW.</strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Helvetica">Good point! I thought that the cylinder/piston would develop the compression...
#12
Three Wheelin'
</font><blockquote><font size="1" face="Verdana,Tahoma,Helvetica">quote:</font><hr /><font size="2" face="Verdana,Tahoma,Helvetica">Originally posted by Christer:
<strong>oh christ, you really don't deserve that RS Piers! </strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Helvetica">Apparently not...just been told that delivery next week is unlikely!
Piers
<strong>oh christ, you really don't deserve that RS Piers! </strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Helvetica">Apparently not...just been told that delivery next week is unlikely!
Piers
#14
</font><blockquote><font size="1" face="Verdana,Tahoma,Helvetica">quote:</font><hr /><font size="2" face="Verdana,Tahoma,Helvetica">Originally posted by Roygarth:
<strong> </font><blockquote><font size="1" face="Verdana,Tahoma,Helvetica">quote:</font><hr /><font size="2" face="Verdana,Tahoma,Helvetica">Originally posted by Christer:
<strong>oh christ, you really don't deserve that RS Piers! </strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Helvetica">Apparently not...just been told that delivery next week is unlikely!
Piers</strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Helvetica">They must read your jokes on this forum.....
<strong> </font><blockquote><font size="1" face="Verdana,Tahoma,Helvetica">quote:</font><hr /><font size="2" face="Verdana,Tahoma,Helvetica">Originally posted by Christer:
<strong>oh christ, you really don't deserve that RS Piers! </strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Helvetica">Apparently not...just been told that delivery next week is unlikely!
Piers</strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Helvetica">They must read your jokes on this forum.....
#15
Rennlist Member
</font><blockquote><font size="1" face="Verdana,Tahoma,Helvetica">quote:</font><hr /><font size="2" face="Verdana,Tahoma,Helvetica">Originally posted by johnfm:
<strong>Rob
compression test measures compression from the piston inside the cylinder. Leakdown measures how well the cylkinder/head/piston rings can maintain pressure.</strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Helvetica">Thanks John
Got it...I can see now how they are different. Doh! (One of my key strengths is knowing what I don't know)
<strong>Rob
compression test measures compression from the piston inside the cylinder. Leakdown measures how well the cylkinder/head/piston rings can maintain pressure.</strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Helvetica">Thanks John
Got it...I can see now how they are different. Doh! (One of my key strengths is knowing what I don't know)