Compression test on a 1jz
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Driver School Candidate
Joined: Oct 2006
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From: FL
Compression test on a 1jz
I need to do a compression test on an sc300 w/ 1jz that I will pick up this weekend. What compression should it have? and other stuff that I need to inspect. Thanks for all the help guys.
Norm
Norm
i believe it calls for 150ish, but that's w/ everything being right
the main thing you want from the comp check is just consistency across all the cylinders.
i personally goes #'s around the 180's
the main thing you want from the comp check is just consistency across all the cylinders.
i personally goes #'s around the 180's
180-190 sounds a tad high for 8.5:1 CR...
follow the lines on the chart, a healthy motor will be somewhere between the two slopes... if it's higher, it probably has some carbon buildup, if it's lower, it's rings are leaking... higher is not horrible always, just a sign the engine needs a little cleaning internally...
Thread Starter
Driver School Candidate
Joined: Oct 2006
Posts: 23
Likes: 0
From: FL
Thanks for the chart
180-190 sounds a tad high for 8.5:1 CR...
follow the lines on the chart, a healthy motor will be somewhere between the two slopes... if it's higher, it probably has some carbon buildup, if it's lower, it's rings are leaking... higher is not horrible always, just a sign the engine needs a little cleaning internally...
180-190 sounds a tad high for 8.5:1 CR...
follow the lines on the chart, a healthy motor will be somewhere between the two slopes... if it's higher, it probably has some carbon buildup, if it's lower, it's rings are leaking... higher is not horrible always, just a sign the engine needs a little cleaning internally...
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Driver School Candidate
Joined: Nov 2006
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From: Ca
91 Ls 400
hey everyone wanted to know what the compression rate(psi) was for a Lexus.
Its a 1991 Ls 400 with 235K miles on it. The numbers I got for each cylinder were:#1-200,#2-225,#3-210,#4-225,#5-209,#6-222,#7-210,#8-225. I repeated the test twice, still same numbers. If anyone can help me with this that would be great. Thanks
Its a 1991 Ls 400 with 235K miles on it. The numbers I got for each cylinder were:#1-200,#2-225,#3-210,#4-225,#5-209,#6-222,#7-210,#8-225. I repeated the test twice, still same numbers. If anyone can help me with this that would be great. Thanks
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hey everyone wanted to know what the compression rate(psi) was for a Lexus.
Its a 1991 Ls 400 with 235K miles on it. The numbers I got for each cylinder were:#1-200,#2-225,#3-210,#4-225,#5-209,#6-222,#7-210,#8-225. I repeated the test twice, still same numbers. If anyone can help me with this that would be great. Thanks
Its a 1991 Ls 400 with 235K miles on it. The numbers I got for each cylinder were:#1-200,#2-225,#3-210,#4-225,#5-209,#6-222,#7-210,#8-225. I repeated the test twice, still same numbers. If anyone can help me with this that would be great. Thanks
yours is good...
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