 Compression tester VS Leak down tester, Which one to buy? |
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 Mar 24, 2012 - 9:39 PM
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Enthusiast  Joined Sep 30, '11 From Sydney Currently Offline Reputation: 0 (0%)  |
Hey guys,
Looking at expanding my tool collection with either one of these two. The leak down test provides more comprehensive results as to where leaks are and exact percentages of cylinder leakage. But the compression test results seem to be what everyone uses in terms of a PSI number. My question is if i use the theoretical value of compression provided by the BGB which is 178 PSI (5s-fe engine) and i use the leak down tester and get a cylinder leakage of 10% can i just deduct 10% from that 178 PSI and get 160.2 PSI compression? If that way works i guess ill get the leak down test if not i need some opinions on what to get. Thanks, Reece |
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Mar 25, 2012 - 3:57 PM
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 Enthusiast Joined Jan 4, '12 From US Currently Offline Reputation: 6 (100%) |
Compression testers are cheaper than Leakdown testers.
You should get a leakdown tester, since it will tell you exactly what is wrong. Compression testers are all different, and one may read 170psi and the other 180psi. All you need to know from a compression tester is that all values are within a certain range of each other (+/- 5% IIRC), not a specific value. -------------------- 1993 Celica GT Coupe - sold
1994 Celica GT Liftback |
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Mar 25, 2012 - 5:17 PM
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Enthusiast Joined Sep 30, '11 From Sydney Currently Offline Reputation: 0 (0%) |
Ok, well if the actual number doesnt really matter i guess ill go with a leak down tester. Thanks
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Mar 25, 2012 - 6:03 PM
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 Enthusiast Joined Jan 17, '08 From JB MDL, NJ Currently Offline Reputation: 30 (100%) |
Compression testers are just overall engine health. Where as a leakdown tester should let you know how much and from where your loosing compression. If your just looking for PSI range and ease of use, get a compression tester.
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Mar 25, 2012 - 9:51 PM
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Enthusiast Joined Jan 4, '12 From US Currently Offline Reputation: 6 (100%) |
QUOTE (Spider77 @ Mar 25, 2012 - 7:03 PM)  Compression testers are just overall engine health. Where as a leakdown tester should let you know how much and from where your loosing compression. If your just looking for PSI range and ease of use, get a compression tester. Yes, I forgot about that detail... Compression testers are very straightforward and only require your remove spark plugs, whereas the leakdown testers are a bit more complicated. -------------------- 1993 Celica GT Coupe - sold
1994 Celica GT Liftback |
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Mar 26, 2012 - 9:24 AM
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Enthusiast Joined Dec 8, '03 From Lancaster CA Currently Offline Reputation: 6 (100%) |
the leakdown will tell you if its in your rings or valves where you are losing compression. I suggest just getting a compression tester. if you have bad compression, the engine is gonna need to be removed anyways.
-------------------- 2001 Celica GT-S Turbo
1997 Supra TT 6speed 1997 Celica 3MZ/1MZ swap 1990 Celica All-Trac |
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Mar 28, 2012 - 3:42 PM
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 Enthusiast Joined Jul 30, '04 From colorado Currently Offline Reputation: 1 (100%) |
QUOTE (Smaay @ Mar 26, 2012 - 3:24 PM) the leakdown will tell you if its in your rings or valves where you are losing compression. I suggest just getting a compression tester. if you have bad compression, the engine is gonna need to be removed anyways. i agree with this. plus you can use a couple drops of oil to determine valves or rings. |
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Mar 28, 2012 - 3:47 PM
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Enthusiast Joined Sep 30, '11 From Sydney Currently Offline Reputation: 0 (0%) |
Ok means i wont need to borrow a compressor when i wanna use it too. Thanks
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