Compression Check DIY for the 1.8T
2nd Gear
Joined: Dec 2006
Posts: 1,165
RE: Compression Check DIY for the 1.8T
for the 2.7t, you can expect the cranking pressure in psi to be about 17 to 20 times the value of the compression ratio. Since the 2.7t is a 9.3:1 engine, you should get somewhere in the neighborhood of 155-185.. but
i found this:
Info provided by Alldata: Compression Pressure Specifications New:9-13bar(130-189psi). Wear limit: 7bar(102psi). Max. permissible difference between cylinders: 3 bar(44psi).
Hope this helps.[/align]
i found this:
Info provided by Alldata: Compression Pressure Specifications New:9-13bar(130-189psi). Wear limit: 7bar(102psi). Max. permissible difference between cylinders: 3 bar(44psi).
Hope this helps.[/align]
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3rd Gear
Joined: Oct 2007
Posts: 2,097
From:
RE: Compression Check DIY for the 1.8T
ORIGINAL: sean1.8t
for the 2.7t, you can expect the cranking pressure in psi to be about 17 to 20 times the value of the compression ratio. Since the 2.7t is a 9.3:1 engine, you should get somewhere in the neighborhood of 155-185.. but
i found this:
Info provided by Alldata: Compression Pressure Specifications New:9-13bar(130-189psi). Wear limit: 7bar(102psi). Max. permissible difference between cylinders: 3 bar(44psi).
Hope this helps.[/align]
for the 2.7t, you can expect the cranking pressure in psi to be about 17 to 20 times the value of the compression ratio. Since the 2.7t is a 9.3:1 engine, you should get somewhere in the neighborhood of 155-185.. but
i found this:
Info provided by Alldata: Compression Pressure Specifications New:9-13bar(130-189psi). Wear limit: 7bar(102psi). Max. permissible difference between cylinders: 3 bar(44psi).
Hope this helps.[/align]
Thread Starter
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3rd Gear
Joined: Oct 2007
Posts: 2,097
From:
RE: Compression Check DIY for the 1.8T
ORIGINAL: onepoint8tee
Edit this with what the correct PSI should be for the different engines and itll make for a good DIY thread in the DIY section.
Edit this with what the correct PSI should be for the different engines and itll make for a good DIY thread in the DIY section.
Site Moderator
Joined: Feb 2007
Posts: 9,004
From: Nor Cal
RE: Compression Check DIY for the 1.8T
ORIGINAL: cincyTT
you should unhook the injectors so you dont have a pool of gas in the engine. Also, a fresh engine should be at 200psi across the board. The min is like 140psi and you shouldnt have more than 10% difference between the highest and lowest cylinders. If you have either less than 140psi or a larger difference in cylinders, you really should consider trading/selling (hard on the conscience i know) the car or rebuilding the engine by having the cylinders rehoned and adding in new rings.
you should unhook the injectors so you dont have a pool of gas in the engine. Also, a fresh engine should be at 200psi across the board. The min is like 140psi and you shouldnt have more than 10% difference between the highest and lowest cylinders. If you have either less than 140psi or a larger difference in cylinders, you really should consider trading/selling (hard on the conscience i know) the car or rebuilding the engine by having the cylinders rehoned and adding in new rings.
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3rd Gear
Joined: Oct 2007
Posts: 2,097
From:
RE: Compression Check DIY for the 1.8T
The service manager at the dealer said avg was 180, Cincy says FRESH is 200. Maybe that is 200 on a fresh engine with a little extra oil in the cylinders. But how often is someone going to do a compression check on a fresh engine? In my case, i waited until the warranty was up (and then some...) before getting ready to do all the cool stuff to make it faster and drive it into the ground quicker.
1st Gear
Joined: Jun 2014
Posts: 1
Hi, sorry to resurrect a pretty old thread but i was hoping someone would have a link to a similar writeup with images, as these ones have expired. I could really use it as I'm about to do this for the first time. Thanks in advance.
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