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Leakdown Question
#1096609
10/17/11 10:42 PM
10/17/11 10:42 PM
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Joined: Jun 2009
Posts: 644
Minnesota
Barnstorm
OP
mopar
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OP
mopar
Joined: Jun 2009
Posts: 644
Minnesota
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What kind of percentages differences would you expect between a warm recently run and a cold motor that hasn't run in a month?
The little old lady from Pasadena is back!
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Re: Leakdown Question
[Re: lewtot184]
#1096611
10/18/11 01:42 PM
10/18/11 01:42 PM
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Joined: Jun 2009
Posts: 644
Minnesota
Barnstorm
OP
mopar
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OP
mopar
Joined: Jun 2009
Posts: 644
Minnesota
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Motor leaked 8 to 11 cold today...36 passes. Down at least 150 hp from timeslips...baffling..dyno next.
The little old lady from Pasadena is back!
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Re: Leakdown Question
[Re: Al_Alguire]
#1096613
10/18/11 03:25 PM
10/18/11 03:25 PM
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Joined: Jun 2009
Posts: 644
Minnesota
Barnstorm
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mopar
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OP
mopar
Joined: Jun 2009
Posts: 644
Minnesota
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I was surprised to see those numbers considering the amount of power loss..gotta look elsewhere. Dyno soon with MY MSD and coil.
The little old lady from Pasadena is back!
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Re: Leakdown Question
[Re: Al_Alguire]
#1096614
10/18/11 03:32 PM
10/18/11 03:32 PM
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Joined: Jun 2008
Posts: 3,916
usa
lewtot184
master
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master
Joined: Jun 2008
Posts: 3,916
usa
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Quote:
I dont know that 8-11% leakdown on a cold engine woudl alarm me, especially wiht nothing to compar it to. As for the performance look at the valvetrain very closely. Those leakdown numbers dont show any glaring issue in cylinder seal to me at least..
i'd have to agree with this. the engine hot may go 5%. i'd look at something else, maybe fuel delivery.
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Re: Leakdown Question
[Re: lewtot184]
#1096615
10/18/11 04:18 PM
10/18/11 04:18 PM
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Joined: Jun 2009
Posts: 644
Minnesota
Barnstorm
OP
mopar
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OP
mopar
Joined: Jun 2009
Posts: 644
Minnesota
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BG 400 checks 1 gal in 14 sec at carb. Swapped Dominators,plugs,timing,valves...starts good, sounds crisp pulls like a good 383 not a 820 hp 500".
The little old lady from Pasadena is back!
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Re: Leakdown Question
[Re: Barnstorm]
#1096616
10/18/11 04:34 PM
10/18/11 04:34 PM
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Joined: Apr 2005
Posts: 2,128
Salt Lake City
camastomcat
top fuel
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top fuel
Joined: Apr 2005
Posts: 2,128
Salt Lake City
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Quote:
BG 400 checks 1 gal in 14 sec at carb. Swapped Dominators,plugs,timing,valves...starts good, sounds crisp pulls like a good 383 not a 820 hp 500".
The leakdown is not that bad for standard file fit rings, however, if they are zero gaps, that's real bad. But I would look at the oil filter first if you've lost that much power, to make sure nothing in the engine is suffering. If it were a fuel problem, I would think it would fall on it's face at WOT.
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Re: Leakdown Question
[Re: Barnstorm]
#1096619
10/18/11 11:13 PM
10/18/11 11:13 PM
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Joined: Oct 2003
Posts: 7,506
Az
Crizila
master
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master
Joined: Oct 2003
Posts: 7,506
Az
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Leakdown tests are like compression tests, without a history ( on a particular engine ) interpreting the results can be "gray" at best - unless you have a major problem somewhere. Comparing hole to hole would be better on a "lone" test IMO. In the 70's, an leak less than 20% was acceptable by most OEM's.
Fastest 300
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)and then remove the valve covers and tap(hard) the rocker arms with a dead blow rubber hammer or plastic mallet while the pressure is in the cylinders and see if it helps seal the valves better cold, sometimes it helps and sometimes it doesn't 
If it still leaks with the same percentage maybe it is time to look elsewhere 
Hows the converter 