# Engine Compession Questions

**URL:** <https://forums.speedlife.net/t/engine-compession-questions/9119>\
**Category:** NYSpeed Automotive\
**Created:** [March 10, 2006, 5:32am UTC](https://forums.speedlife.net/t/engine-compession-questions/9119 "2006-03-10T05:32:05Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![sureshot](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/sureshot/32/7578_2.png) [@sureshot](https://forums.speedlife.net/u/sureshot)\
**Post date:** [March 10, 2006, 5:32am UTC](https://forums.speedlife.net/t/engine-compession-questions/9119/1 "2006-03-10T05:32:05Z")

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Sup all,

Checking out a car later, and the compression of the engine is about 15% higher than factory spec. My first assumption is that there is carbon buildup in the cylinders, which is probably the most likely situation, right?

It’s a turbo high mileage engine, but still within reliable limits.

Is it outrageous to request that technique which involves using the bubble soap stuff which annihilates the carbon, and spits out the crap through the exhaust? then ask to run another compression check? My thinking is that perhaps the carbon buildup is greater than just 15% and perhaps the compression is lower than factory spec. Is that a rediculous assumption?

Just slightly nervous since it is a high mileage engine, the owner has all the receipts from maintenance and crap, but :shrug:

thanks

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**Author:** ![Carnut](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/carnut/32/7590_2.png) [@Carnut](https://forums.speedlife.net/u/Carnut)\
**Post date:** [March 10, 2006, 7:15am UTC](https://forums.speedlife.net/t/engine-compession-questions/9119/2 "2006-03-10T07:15:37Z")

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no  
what kind of car is this

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**Author:** ![skatanic28](https://avatars.discourse-cdn.com/v4/letter/s/8e7dd6/32.png) [@skatanic28](https://forums.speedlife.net/u/skatanic28)\
**Post date:** [March 10, 2006, 7:18am UTC](https://forums.speedlife.net/t/engine-compession-questions/9119/3 "2006-03-10T07:18:56Z")

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do you know if there has been a head gasket failure?

maybe they milled the head a bit…

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**Author:** ![TrueBlue](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/trueblue/32/7245_2.png) [@TrueBlue](https://forums.speedlife.net/u/TrueBlue)\
**Post date:** [March 10, 2006, 7:22am UTC](https://forums.speedlife.net/t/engine-compession-questions/9119/4 "2006-03-10T07:22:29Z")

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> [@sureshot!](#):
>
> the compression of the engine is about 15% higher than factory spec.  
> …  
> and perhaps the compression is lower than factory spec.

which is it, higher or lower?

> [@sureshot!](#):
>
> Is it outrageous to request that technique which involves using the bubble soap stuff which annihilates the carbon, and spits out the crap through the exhaust?

seafoam is what you’re thinking of.

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**Author:** ![focusinprogress](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/focusinprogress/32/7227_2.png) [@focusinprogress](https://forums.speedlife.net/u/focusinprogress)\
**Post date:** [March 10, 2006, 7:41am UTC](https://forums.speedlife.net/t/engine-compession-questions/9119/5 "2006-03-10T07:41:50Z")

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> [@skatanic28](#):
>
> do you know if there has been a head gasket failure?
> 
> maybe they milled the head a bit…

that would definately do the trick

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**Author:** ![Onyx\_Z32](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/onyx_z32/32/7581_2.png) [@Onyx\_Z32](https://forums.speedlife.net/u/Onyx_Z32)\
**Post date:** [March 10, 2006, 7:50am UTC](https://forums.speedlife.net/t/engine-compession-questions/9119/6 "2006-03-10T07:50:04Z")

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:word: Check the receipts from the maintenance / ask if the headgasket(s) were ever done.

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**Author:** ![Tkklemann](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/tkklemann/32/7298_2.png) [@Tkklemann](https://forums.speedlife.net/u/Tkklemann)\
**Post date:** [March 10, 2006, 9:03am UTC](https://forums.speedlife.net/t/engine-compession-questions/9119/7 "2006-03-10T09:03:05Z")

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> [@TrueBlue](#):
>
> seafoam is what you’re thinking of.

Isn’t that the shit you use to stick your dentures in with?