# What's Your Compression? **URL:** \ **Category:** SON240sx Automotive\ **Created:** [November 9, 2004, 7:38pm UTC](https://forums.speedlife.net/t/whats-your-compression/81967 "2004-11-09T19:38:45Z")\ **Posts on this page:** 13\ **Page:** 1
**Author:** ![DarkForceJackal](https://avatars.discourse-cdn.com/v4/letter/d/b38774/32.png) [@DarkForceJackal](https://forums.speedlife.net/u/DarkForceJackal)\ **Post date:** [November 9, 2004, 7:38pm UTC](https://forums.speedlife.net/t/whats-your-compression/81967/1 "2004-11-09T19:38:45Z")
What are your compression test results & your mileage? (‘normal’ KA24DE’s only please, or specify another engine) Reason I ask, is my engine is back to normal, feels good etc. But the mechanic said that while he was checking my car for the no-start condition the compression was 150,150,125,100 psi. NOT acceptable! I am going to get my compression re-tested elsewhere to verify. I wonder if a low battery, cold engine, or closed throttle might have skewed results to cause this. If not, I may have piston/valve/HG issues…not cool. Or, would I DEFINITELY _feel_ if the compression was this bad? For the record, the standard is 151 psi minimum - 179 psi maximum, max 14 psi between cylinders on the KA24DE. So out of curiousity, if you’ve checked lately, post your compression results and mileage! 🙂 Thanks. ---
**Author:** ![RS13](https://avatars.discourse-cdn.com/v4/letter/r/46a35a/32.png) [@RS13](https://forums.speedlife.net/u/RS13)\ **Post date:** [November 9, 2004, 8:19pm UTC](https://forums.speedlife.net/t/whats-your-compression/81967/2 "2004-11-09T20:19:52Z")
i just got lucky on mine 91 240sx ka24de 1-175 2-177 3-177 4-175 i watched and helped the guy do it so i’m extremely happy. leak down was also perfect 6 psi here i come oh and i just hit 200 000 KMS ---
**Author:** ![SHIFT\_KA24DET](https://avatars.discourse-cdn.com/v4/letter/s/b9bd4f/32.png) [@SHIFT\_KA24DET](https://forums.speedlife.net/u/SHIFT_KA24DET)\ **Post date:** [November 9, 2004, 10:14pm UTC](https://forums.speedlife.net/t/whats-your-compression/81967/3 "2004-11-09T22:14:25Z")
182-181-180-181 on a 38k S13 KA24DE Leakdown was 6psi Fuel Consumption/Tank ~400km ---
**Author:** ![Solarian](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/solarian/32/5514_2.png) [@Solarian](https://forums.speedlife.net/u/Solarian)\ **Post date:** [November 10, 2004, 6:11am UTC](https://forums.speedlife.net/t/whats-your-compression/81967/4 "2004-11-10T06:11:06Z")
How are you above the maximum? Any intake, exhaust, headers, etc? ---
**Author:** ![s14\_2Nv](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/s14_2nv/32/5476_2.png) [@s14\_2Nv](https://forums.speedlife.net/u/s14_2Nv)\ **Post date:** [November 10, 2004, 6:19am UTC](https://forums.speedlife.net/t/whats-your-compression/81967/5 "2004-11-10T06:19:45Z")
> [@Solarian](#): > > How are you above the maximum? Any intake, exhaust, headers, etc? That stuff doesn’t raise compression. ---
**Author:** ![mr200](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/mr200/32/5495_2.png) [@mr200](https://forums.speedlife.net/u/mr200)\ **Post date:** [November 10, 2004, 9:26am UTC](https://forums.speedlife.net/t/whats-your-compression/81967/6 "2004-11-10T09:26:49Z")
a motor with that amount of variance should not run “normal” or “good” 50 psi variance, and your best is still below the minimum. My ca18et has better compression than that, and that’s an 8:1 motor! By all rights, this thing should run like a dog. Do the compression test yourself, with the trottle open. Hell, I’ll lend you my tester if you need it. No sense in paying someone money to do it, then have to pay to get them to do the diagnosis and work. Throw the compression tester on it and crank. If you have cylinders that are down susbtantially after rechecking them 100 times (well not that many) add a tsp of oil to the cylinder through the spark plug hole and retest it. If the compression comes up, bad news … your rings are fried. If the compression doesn’t come up, it’s valve seals. I’ve found in and around 180,000km is the most to expect out of a KAs valve seals. If that’s the case, you’re laughing. It’s a simple job to change out valve seals. And if you need it, I can hook you up with an on-head spring compressor. ---
**Author:** ![s13Junkyard](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/s13junkyard/32/5502_2.png) [@s13Junkyard](https://forums.speedlife.net/u/s13Junkyard)\ **Post date:** [November 10, 2004, 3:04pm UTC](https://forums.speedlife.net/t/whats-your-compression/81967/7 "2004-11-10T15:04:59Z")
165psi on all 4 yo!!! and 185psi on all 4 in my spare motor WOOOOT boooyaaaaaaaa ---
**Author:** ![DarkForceJackal](https://avatars.discourse-cdn.com/v4/letter/d/b38774/32.png) [@DarkForceJackal](https://forums.speedlife.net/u/DarkForceJackal)\ **Post date:** [November 10, 2004, 6:32pm UTC](https://forums.speedlife.net/t/whats-your-compression/81967/8 "2004-11-10T18:32:00Z")
To you guys with wonderful compression - POO. 🙂 MR200, you have PM. ---
**Author:** ![DarkForceJackal](https://avatars.discourse-cdn.com/v4/letter/d/b38774/32.png) [@DarkForceJackal](https://forums.speedlife.net/u/DarkForceJackal)\ **Post date:** [November 19, 2004, 8:40pm UTC](https://forums.speedlife.net/t/whats-your-compression/81967/9 "2004-11-19T20:40:26Z")
Compression tested my engine at another shop after everything fixed - 170,175,175,170 psi. Wonderful. 😃 Thread can be locked. ---
**Author:** ![Uniac](https://avatars.discourse-cdn.com/v4/letter/u/34f0e0/32.png) [@Uniac](https://forums.speedlife.net/u/Uniac)\ **Post date:** [November 19, 2004, 9:41pm UTC](https://forums.speedlife.net/t/whats-your-compression/81967/10 "2004-11-19T21:41:46Z")
humm…i’ll post mine tomarrow…hehehe…the rings aren’t seated yet, but i was hitting 150 just hand cranking the SOB…i’m willing to bet over 200psi per without seated rings…thinking closer to 250 per…hehehe…post pics tomarrow night when i get off work. ---
**Author:** ![nissan4ever](https://avatars.discourse-cdn.com/v4/letter/n/67e7ee/32.png) [@nissan4ever](https://forums.speedlife.net/u/nissan4ever)\ **Post date:** [November 20, 2004, 7:57am UTC](https://forums.speedlife.net/t/whats-your-compression/81967/11 "2004-11-20T07:57:31Z")
S13 with 209k on it, i got 160,160,165,160. Make sure engine is up to operating temperature. All spark plugs are out. Throttle wide open. Make sure Starter turning fine not slow because of weak battery. Last but not least “MAKE SURE YOU HAVE A DECENT COMPRESSION GAUGE OR DONT BOTHER WITH THE COMPRESSION BECAUSE THE RESULTS ARE GONNA BE OFF”. ---
**Author:** ![DarkForceJackal](https://avatars.discourse-cdn.com/v4/letter/d/b38774/32.png) [@DarkForceJackal](https://forums.speedlife.net/u/DarkForceJackal)\ **Post date:** [November 20, 2004, 8:55am UTC](https://forums.speedlife.net/t/whats-your-compression/81967/12 "2004-11-20T08:55:08Z")
Why throttle wide open? Is this true? Is this a Nissan thing, or all cars? ---
**Author:** ![nissan4ever](https://avatars.discourse-cdn.com/v4/letter/n/67e7ee/32.png) [@nissan4ever](https://forums.speedlife.net/u/nissan4ever)\ **Post date:** [November 21, 2004, 10:14am UTC](https://forums.speedlife.net/t/whats-your-compression/81967/13 "2004-11-21T10:14:13Z")
Because you need the maximum amount of air in the cylinder to get the pressure reading and if the throttle is closed not enough air will get in and the reading will be lower. That’s a standard test for most cars not just nissan.