seal of piston rings

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seal of piston rings

Post  Rabbit on July 18th 2014, 5:21 pm

Do piston rings seal better when new or do they seal better after they ran after lets say 2000 miles the reason im asking is that im doing a leak down test block fresh out the machine shop with file fit rings
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Re: seal of piston rings

Post  dfree383 on July 18th 2014, 5:45 pm

they need to seat first.
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Re: seal of piston rings

Post  richter69 on July 18th 2014, 7:44 pm

same
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Re: seal of piston rings

Post  Rabbit on July 18th 2014, 9:18 pm

what if they were 80% pale .019 top a bottom
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Re: seal of piston rings

Post  69F100 on July 18th 2014, 9:28 pm

New rings will have to seat to the cylinders before you will get a true reading I just about bet the leak down test will fell if the rings have not been seated yet.
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Re: seal of piston rings

Post  Rabbit on July 18th 2014, 9:52 pm

man I sure hope so some thing like this can drive a man crazy all the way from the engine stand to the hood
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Re: seal of piston rings

Post  Larry T on July 18th 2014, 10:12 pm

did you do a leak test on the valves before assembly to see if they were seated properly?you didn say how many miles you had on the motor.
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Re: seal of piston rings

Post  Rabbit on July 18th 2014, 10:20 pm

brand new motor fresh out the machine shop $1700 worth still on the stand
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Re: seal of piston rings

Post  bbf-falcon on July 19th 2014, 8:14 am

You need to let that NEW engine get really good and Hot at least 200/210* then let it cool down. They will seat. Very Happy 

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Re: seal of piston rings

Post  Rabbit on July 19th 2014, 8:00 pm

update I returned that cheap leak down junk scrap of a tool got a new one from NAPA boy did that make a differece 23%-17% across the board cheers you live and learn DO NOT BUY CHEAP TOOLs
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Re: seal of piston rings

Post  c.evans on July 19th 2014, 8:47 pm

I tell my guys to never do a cold leakdown test anyway. The results from a cold test are as useless as tits on a boar hog. Always do a leakdown test with a very warm engine.

Hope this helps,
Charlie

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Re: seal of piston rings

Post  Rabbit on July 20th 2014, 9:55 am

c.evans wrote:I tell my guys to never do a cold leakdown test anyway.  The results from a cold test are as useless as tits on a boar hog.  Always do a leakdown test with a very warm engine.

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  C.Evans how much of a difference is there between a warm and a cold engine by your experience when doing a leak down test 5% 10%
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Re: seal of piston rings

Post  c.evans on July 20th 2014, 10:19 pm

The percentage varies, but I've seen it be over 20%. Couple of my guys have called with their panties in a wad, telling me it's got 18% leakdown or some number, and then when they tell me it was cold, they get a butt chewing for even bothering me. I tell them to do it hot and then call me back,,, when they do, they're are kind of sheepish because now it's 3 or 4%.

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