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My first post! Compression test & oily spark plug question.


This is a discussion on My first post! Compression test & oily spark plug question. within the Performance Mods forums, part of the Viper Truck SRT-10 Discussion category!
Got an 06 SRT truck, and wondering if anyone knows what compression I should see. I am fixing to do ...




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Old 06-25-2009, 04:05 PM
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My first post! Compression test & oily spark plug question.

Got an 06 SRT truck, and wondering if anyone knows what compression I should see. I am fixing to do a compression test because I have a few issues. Also the #1 spark plug has some oil on it, and looks fouled out. Anyone know what would be the most common cause of the oil in the #1 cyl? There is a paxton on the truck, but runs good. I work for Chrysler and picked this truck up as a repo a few months ago. The only mod I did was change the headers from Bassani shortys to a sweet set of full length American Racing Headers & Straight through mids & a custom Flowmaster exhaust. The truck puts down 620HP at the wheels on a dynojet before the Header/exhaust change. It has a few other mods too that came on the truck. Have no idea if it is the stock engine or not. The blower has been on the truck for at least 5000 miles that I have driven it. Thanks in advance for any help.

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Old 06-25-2009, 04:28 PM
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Sorry, I don't know what a the compression should check out at Someone will chime in soon on that.

Welcome to the forum Sounds like to you got a bada$$ truck. Oh, and post some pics
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Old 06-25-2009, 04:46 PM
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160 - 170 range is normal for a stock engine, a few variables here... if it has a performance cam, it might be less...altitude is also a factor (the higher you are, the less it will be).

A leakdown test would be way more meaningful than a compression test. Hopefully, you will see no more than a 25% loss.

Oily plug could be from a bad valve guide or rings. Running with an oily cylinder isn't good. Oil vapors have a real low "octane" value and if it is detonating because of it or if your tune is off, or both, your stock cast piston may not last very long.
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Old 06-25-2009, 04:54 PM
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Old 06-25-2009, 04:58 PM
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Welcome and Hello, Glad that your truck found a loving owner that is interested in fixing it instead of using it up and tossing it away..
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Old 06-25-2009, 05:01 PM
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welcome to the club.... ......bad news is your truck is a time bomb if the bottom end has not been forged....you may already be seeing signs of that...
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Old 06-25-2009, 05:06 PM
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Welcome to the club,and what TNVIPER said is correct.
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Old 06-25-2009, 06:37 PM
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Old 06-25-2009, 06:51 PM
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First off,Welcome to the best forum on the planet,
Second,I,m assuming that you changed the oil right off,I've seen a couple of engines,where the rings aligned and created blow by.Your best bet is to perform a leakdown test and take it from there,Also make sure that you do not have an injector leaking down.Could cause wash down to the cylinder walls,not to mention possible damage to the Paxton which is oil fed..
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Old 06-26-2009, 12:30 AM
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Quote:
Originally Posted by rottenronnie
160 - 170 range is normal for a stock engine, a few variables here... if it has a performance cam, it might be less...altitude is also a factor (the higher you are, the less it will be).

A leakdown test would be way more meaningful than a compression test. Hopefully, you will see no more than a 25% loss.

Oily plug could be from a bad valve guide or rings. Running with an oily cylinder isn't good. Oil vapors have a real low "octane" value and if it is detonating because of it or if your tune is off, or both, your stock cast piston may not last very long.
Thanks for all the replys people. I am 32 yrs old and been doing majors mods to my vehicles completely myself since I was 16. I am much more familiar with the LT1/LS1 cars, but I have also had 2 Vipers in the past. I have always done my own work when modifying cars, but for whatever reason I have never had to perform a leak down test. How exactly do I perform this and what exactly will I be looking for? I know if the bottom end is stock, it may just be getting weak. Thanks.
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