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In Cylinder Pressure Testing (Read 11,419 times)
DIY Charlie
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In Cylinder Pressure Testing
Apr 3rd, 2018 at 7:25am
 
Hello. I would like to take a known good running in cylinder compression waveform for my database. The problem is my injectors are covered by the manifold so I can't disconnect it. My question is can I run it just enough to get a capture without flooding the cylinders?
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busjockey
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Re: In Cylinder Pressure Testing
Reply #1 - Apr 3rd, 2018 at 10:20am
 
What type of Vehicle are you working on?
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DIY Charlie
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Re: In Cylinder Pressure Testing
Reply #2 - Apr 3rd, 2018 at 2:46pm
 
It's 99 Mountaineer 5.0
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Re: In Cylinder Pressure Testing
Reply #3 - Apr 3rd, 2018 at 3:06pm
 
DIY Charlie wrote on Apr 3rd, 2018 at 7:25am:
run it just enough to get a capture without flooding the cylinders?

Yes you can but limit it to running just enough till you get a steady reading.  Don't do it multiple times.  You will fill the crankcase with fuel.  Plus when your done testing check your oil and make sure it is not diluted from fuel.  If it is change your oil. Smiley  Don't forget to disable spark for that cylinder too. Smiley
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Re: In Cylinder Pressure Testing
Reply #4 - Apr 3rd, 2018 at 4:37pm
 
will do thanks
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Abndanger
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Re: In Cylinder Pressure Testing
Reply #5 - Apr 4th, 2018 at 2:09am
 
busjockey wrote on Apr 3rd, 2018 at 3:06pm:
Don't forget to disable spark for that cylinder too. 


He would need to have a spark tester installed as to keep stray voltage away from the pressure transducer and if he has secondary leads it would be nice to see where the spark is occurring while testing Wink
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Re: In Cylinder Pressure Testing
Reply #6 - Apr 4th, 2018 at 10:49am
 
Abndanger wrote on Apr 4th, 2018 at 2:09am:
if he has secondary leads it would be nice to see where the spark is occurring while testing

Very true, wasn't thinking about that.   Smiley
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Re: In Cylinder Pressure Testing
Reply #7 - Apr 4th, 2018 at 11:13am
 
busjockey wrote on Apr 4th, 2018 at 10:49am:
Abndanger wrote on Apr 4th, 2018 at 2:09am:
if he has secondary leads it would be nice to see where the spark is occurring while testing

Very true, wasn't thinking about that.† †Smiley

We usually have the rookie stick his tongue on it for the test.   Grin
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DIY Charlie
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Re: In Cylinder Pressure Testing
Reply #8 - Apr 4th, 2018 at 1:14pm
 
For the time being I decided to take in cylinder pressure on my wife's car. It's a 2014 Elantra 1.8L. I'll post the snapshot later. For now lets say I dodged my wife's wrath. The adapter fitting that threaded to the compression hose was stuck in the spark plug hole! I tried a 17mm socket but the socket wall was to thick. My brother in-law is a mechanic so he came by and removed the fitting. Whew!!!
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Re: In Cylinder Pressure Testing
Reply #9 - Apr 4th, 2018 at 1:55pm
 
DIY Charlie wrote on Apr 4th, 2018 at 1:14pm:
The adapter fitting that threaded to the compression hose was stuck in the spark plug hole!


What make of pressure transducer are you using?
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DIY Charlie
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Re: In Cylinder Pressure Testing
Reply #10 - Apr 4th, 2018 at 4:39pm
 
It was a custom
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Re: In Cylinder Pressure Testing
Reply #11 - Apr 4th, 2018 at 6:57pm
 
DIY Charlie wrote on Apr 4th, 2018 at 1:14pm:
For the time being I decided to take in cylinder pressure on my wife's car. It's a 2014 Elantra 1.8L. I'll post the snapshot later. For now lets say I dodged my wife's wrath. The adapter fitting that threaded to the compression hose was stuck in the spark plug hole! I tried a 17mm socket but the socket wall was to thick. My brother in-law is a mechanic so he came by and removed the fitting. Whew!!!


Thank goodness for the brother-in-law mechanic!   Grin
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Mick
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Re: In Cylinder Pressure Testing
Reply #12 - Apr 4th, 2018 at 7:18pm
 
DIY Charlie wrote on Apr 4th, 2018 at 4:39pm:
It was a custom


Thank you for replying back to me.

Will this custom unit calibrate to atmospheric pressure and form a line scaled to zero on your scope?

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DIY Charlie
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Re: In Cylinder Pressure Testing
Reply #13 - Apr 5th, 2018 at 1:06pm
 
For some reason I can't post an image when i click the "choose file"

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Tom Roberts
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Re: In Cylinder Pressure Testing
Reply #14 - Apr 5th, 2018 at 2:21pm
 
DIY Charlie wrote on Apr 5th, 2018 at 1:06pm:
For some reason I can't post an image when i click the "choose file"


Are you doing this?:

http://www.autonerdz.com/cgi/yabb2/YaBB.pl?num=1330357236

Please be sure to resize the image to make the file smaller.

Previewing a post will remove all attachments.
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