Pre-purchase Testing
Thread Starter
Drifting
Joined: Nov 2004
Posts: 1,484
Likes: 0
From: Nanaimo, BC
Pre-purchase Testing
Hey guys - 2 quick questions. I've got a guy that wants to buy my 91 Coupe, but her would like to have it checked out before he buys it, which I am fine with, as I don't anticipate there are any problems.
The 2 elements he wants to have checked out are a compression test, and a tranny check.
#1 - What is a good result on a compression test. Is there a link / info. that will show me great vs. good vs. fair vs. poor, so that I can see what the actual compression numbers mean?
#2 - He indicated that they could do some sort of pressure test on the tranny? Anyone familiar with this? What do they test the tranny for?
Thanks for the help guys.
The 2 elements he wants to have checked out are a compression test, and a tranny check.
#1 - What is a good result on a compression test. Is there a link / info. that will show me great vs. good vs. fair vs. poor, so that I can see what the actual compression numbers mean?
#2 - He indicated that they could do some sort of pressure test on the tranny? Anyone familiar with this? What do they test the tranny for?
Thanks for the help guys.
Instructor
Joined: Apr 2006
Posts: 247
Likes: 0
From: West Burlington Iowa
Compression test just shows the rings, valves and cylinder's are still in good working order, therefore holding proper compression. "Not worn out". Transmission pressure check just confirms the transmission pump and internal flow is ok. Low pressure there might mean just a dirty filter up to a transmission is worn and will need replaced soon. If a low transmission pressure is present then more diagnostics have to be done for like I said it might just need a filter change and new filter.
Thread Starter
Drifting
Joined: Nov 2004
Posts: 1,484
Likes: 0
From: Nanaimo, BC
Compression test just shows the rings, valves and cylinder's are still in good working order, therefore holding proper compression. "Not worn out". Transmission pressure check just confirms the transmission pump and internal flow is ok. Low pressure there might mean just a dirty filter up to a transmission is worn and will need replaced soon. If a low transmission pressure is present then more diagnostics have to be done for like I said it might just need a filter change and new filter.
And thnaks for the heads up on the tranny check
Race Director
Joined: Dec 2006
Posts: 10,383
Likes: 4
General specs are that the lowest cylinder not be less than 70% of the highest and no cylinder less than 100 psi.
If you have one, a current emmisions test results sheet should be enough to show him that the engine is sound.
Last edited by 94z07fx3; Aug 5, 2007 at 04:16 PM.
