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Old 09-18-2012, 04:03 PM   #31 (permalink)
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Good reading on leakdown testing.

Cylinder Leak Down Test

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Old 09-18-2012, 04:13 PM   #32 (permalink)
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Great read, thanks for the link!
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Old 09-18-2012, 07:07 PM   #33 (permalink)
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Oooooh! That link really helped. Now I have a better understanding of not only the procedure but kind of what is going on. When thinking back on some of the questions I've asked Mike over the last two days, I have to wonder why he didn't think I was insane. I kinda get it now. Thanks!
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Old 09-20-2012, 02:52 AM   #34 (permalink)
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i got the tester today and did cylinder 1. I basically hooked up the hose and hand cranked the engine while i put my finger over the hose and it built up pressure. When it stopped building pressure, i backed it up a notch. I hooked up the tester and i got 4% leakage on a cold engine. I believe this is good? I have not done the rest because i did not have the time. I just wanted to see where i was at with one.
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Old 09-20-2012, 04:15 AM   #35 (permalink)
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4% is excellent! Especially for a cold engine. Hope they're all like that. Remember, a warm engine gives the most accurate reading.
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Old 09-20-2012, 03:54 PM   #36 (permalink)
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The problem with a warm engine is its a bitch to get in there. With the headers and header locks, i would have burns everywhere.

I figure if there is a problem it will show cold or hot. I am going to keep going on it and will report results.

Anyone see a problem with the method of putting your finger over the hose and stoping when compression stops?
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Old 09-20-2012, 04:20 PM   #37 (permalink)
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Many of us with the Spec Racers fight this same issue, after 30 min of constant 5-6K on engine (5.0 l) we have oil coming up the dip stick tube, we have done the leak downs test and no issues show up. We all run PCV and either 1 or 2 valve cover vents into catch cans, we can also vent the dip stick into a catch can and empty our catch cans after each race and get 6+ oz out of these.
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