Compression Test

lmmr74 · 07-05-2012, 09:13 AM

Hello, i just did a compression test on my 89 Supra Turbo (7M-GTE), and i got the following results:

Cylinder 1 12.5
Cylinder 2 10.5
Cylinder 3 11.5
Cylinder 4 10.5
Cylinder 5 11.5
Cylinder 6 12.5

Can someone help on these numbers?? Are these ok? I am confused because on the technicall manual, it says taht minimum compression is 9, and normal is 10 or higher, on the other hand the guy in the auto store told me that should be around 8.4...
Thanks in advance for your help!!

cre · 07-05-2012, 11:16 PM

The guy at the auto store doesn't have all the info or is just basing that number off his experience with different engines.

The high numbers is most likely due to carbon buildup in the cylinders. The only are of concern is the high difference in compression between neighboring cylinders. I'd recommend either steaming the cylinders or running some Mopar Combustion Cylinder Cleaner through it (follow the directions).

07-05-2012, 09:13 AM	#1
lmmr74 Stock Join Date: Aug 2011 Location: Portugal Posts: 21	Compression Test Hello, i just did a compression test on my 89 Supra Turbo (7M-GTE), and i got the following results: Cylinder 1 12.5 Cylinder 2 10.5 Cylinder 3 11.5 Cylinder 4 10.5 Cylinder 5 11.5 Cylinder 6 12.5 Can someone help on these numbers?? Are these ok? I am confused because on the technicall manual, it says taht minimum compression is 9, and normal is 10 or higher, on the other hand the guy in the auto store told me that should be around 8.4... Thanks in advance for your help!!

07-05-2012, 11:16 PM	#2
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	The guy at the auto store doesn't have all the info or is just basing that number off his experience with different engines. The high numbers is most likely due to carbon buildup in the cylinders. The only are of concern is the high difference in compression between neighboring cylinders. I'd recommend either steaming the cylinders or running some Mopar Combustion Cylinder Cleaner through it (follow the directions). __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

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