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Xzero View Public Profile Find More Posts by Xzero View iTrader Profile Apr 27, 2009 | 05:24 PM Share Share Options #8 superchargedg Damn Noobs iTrader: (4) Joined: Dec 2005 Posts: 7,274 Likes: 2 From: timonium,md. It is a shame you lazy *** **** cant search though. Reply 0 0 superchargedg View Public Profile Find More Posts by superchargedg View iTrader Profile Apr 28, 2009 | 11:13 AM Share Share Options #9 ngynnhu Registered User Joined: Apr 2006 Posts: 56 Likes: 3 From: florida Quote: Originally Posted by VQZ33 I have never done a leakdown test before, how would I do that? 1. you need the have engine at operating temp 2. remove spark plugs 3. make sure the piston ur testig is at TDC at the compression stroke (so both intake and exhaust valve is closed) 4. install a tester into the spark plug hole 5. air from an air compressor will go through the leakage tester too see if you have any leaks. -if you don't have one just hook up an air compresser, and put some air in it. (not to much); listen for any hissing coming from ur tailpipe, oil fill hole, and air intake. If you hear any hissing then u have a leak.. If you got more questions on what tool or how to do it read this http://www.aa1car.com/library/leakdown.htm Reply 1 1 soflushed ngynnhu View Public Profile Find More Posts by ngynnhu View iTrader Profile Apr 28, 2009 | 08:05 PM Share Share Options #10 Z4lif3 Registered User iTrader: (20) Joined: Oct 2006 Posts: 361 Likes: 0 From: New Jersey lol... be nice to davidv... Reply 0 0 Z4lif3 View Public Profile Find More Posts by Z4lif3 View iTrader Profile Apr 29, 2009 | 02:20 PM Share Share Options #11 OCG35 Banned iTrader: (2) Joined: Aug 2005 Posts: 1,228 Likes: 0 From: OC - So Cal Actually a good topic and a couple good posts in here – I hope it goes more towards the beneficial and away from the silly. So leak down is more critical than compression test, got it… but back to the OP – can someone give a little info regarding compression test… Reply 0 0 OCG35 View Public Profile Find More Posts by OCG35 View iTrader Profile Apr 29, 2009 | 04:24 PM Share Share Options #12 BaZooKa Registered User iTrader: (7) Joined: Nov 2007 Posts: 676 Likes: 0 From: Kuwait i would like to know to.. subscribing Reply 0 0 BaZooKa View Public Profile Find More Posts by BaZooKa View iTrader Profile Apr 30, 2009 | 10:55 AM Share Share Options #13 ngynnhu Registered User Joined: Apr 2006 Posts: 56 Likes: 3 From: florida Quote: Originally Posted by OCG35 Actually a good topic and a couple good posts in here – I hope it goes more towards the beneficial and away from the silly. So leak down is more critical than compression test, got it… but back to the OP – can someone give a little info regarding compression test… I'm not sure what the compression should be,but when you do a compression test the compression for all the cylinders should be relatively the same. For example if you do the dry compression test, and all the cylinders are around the number that it's suppose to be then your fine. If one is lower you wanna do a wet compression test by putting a little oil in the cylinder, so that it helps seal the piston rings. If the compression goes up then you probably a have bad piston ring. If the compression stays the same (meaning it's still low), you have some other problem (bad valves, bad cylinder bore, or the ring can be very bad and the oil couldn't seal it). Reply 0 0 ngynnhu View Public Profile Find More Posts by ngynnhu View iTrader Profile Apr 30, 2009 | 11:10 AM Share Share Options #14 ngynnhu Registered User Joined: Apr 2006 Posts: 56 Likes: 3 From: florida oh i found the compression specs. the compression standard is 185psi. the minimum that psi that the compression can be is 142psi, and the differential limit b/w the cylinders is 14psi. So to recap my above post : ● If compression pressure is below minimum value, check valve clearances and parts associated with combustion chamber (valve, valve seat, piston, piston ring, cylinder bore, cylinder head, cylinder head gasket). After the checking, measure compression pressure again. ● If some cylinders have low compression pressure, pour small amount of engine oil into the spark plug hole of the cylinder to re-check it for compression. – If the added engine oil improves the compression, piston rings may be worn out or damaged. Check the piston rings and replace if necessary. – If the compression pressure remains at low level despite the addition of engine oil, valves may be mal- functioning. Check valves for damage. Replace valve or valve seat accordingly. ● If two adjacent cylinders have respectively low compression pressure and their compression remains low even after the addition of engine oil, cylinder head gaskets are leaking. In such a case, replace cylinder head gaskets. I hope this helps some of you guys out. Reply 2 2 soflushed devanch ngynnhu View Public Profile Find More Posts by ngynnhu View iTrader Profile May 4, 2009 | 02:27 PM Share Share Options #15 VQZ33 Thread Starter Registered User Joined: Apr 2008 Posts: 259 Likes: 0 From: Long Beach C.A Cool thanks for all the info guys, I have been real busy with work lately and the car has just been sitting. I will be doing the test this weekend and I will also be posting pictures for a DIY! Results will also be posted thanks!!! Reply 0 0 VQZ33 View Public Profile Find More Posts by VQZ33 View iTrader Profile May 4, 2009 | 03:29 PM Share Share Options #16 OCG35 Banned iTrader: (2) Joined: Aug 2005 Posts: 1,228 Likes: 0 From: OC - So Cal Ngynnhu – thanks for the recent 2 posts! Now I need to determine how detailed Cipher actually gets with “cylinder power testing”?... Gotta rid the glitch first, I cant get it to load Reply 0 0 OCG35 View Public Profile Find More Posts by OCG35 View iTrader Profile Reply Subscribe Related Topics Thread Thread Starter Forum Replies Last Post question about carfax report issyz 2003-2009 Nissan 350Z 6 Jul 2, 2017 04:04 PM FS: Sparco Helmet Carbon Fiber WTX-7 Air BNIB must see Gruppe-S Body Interior 13 May 16, 2016 11:42 PM 12/24mpg normal for art test pipes? codek Intake Exhaust 11 Sep 28, 2015 04:03 AM Tags 350z, calgary, compression, cylinder, engine, force, forum, induction, leak, leakdown, seat, test, tester, valve, vq35, vq35de Back to Subforum Engine & Drivetrain View Next Unread SS Clutch line recommendation Thread Tools Show Printable Version Search this Thread Advanced Search Thread Tools Show Printable Version Email this Page Advanced Search User Control Panel Private Messages Subscriptions Who's Online Search Forums Forums Home My350Z.com Announcements Feedback & Suggestions for Our Forum Marketplace Events Upcoming Events General 2009+ 370Z New Owners NISMO 370Z 370Z Roadster 2003-2009 Nissan 350Z New Owners NISMO 350Z 350Z Roadster G35/G37 2009+ Nissan GT-R Buying/Leasing Media Share Event Photos 350z Colors Photoshop Videos Photography Motorsports Autocross/Road Drift Drag 350Z Tech Area Engine & Drivetrain VQ35HR Tuning Intake Exhaust Nitrous Oxide Forced Induction Shop Builds Product Announcements FI FAQ's NA Builds Engine Swaps Exterior & Interior Wheels & Tires Brakes & Suspension Audio & Video Audio Builds Maintenance & Repair Cleaning & Detailing 370Z Tech Area 370Z Engine & Drivetrain VQ37HVR Tuning Intake Exhaust Nitrous Oxide Forced Induction FI FAQ's Product Announcements Shop Builds NA Builds 370Z Exterior & Interior 370Z Wheels & Tires 370Z Brakes & Suspension 370Z Audio & Video Audio Builds 370Z Maintenance & Repair Cleaning & Detailing Do It Yourself Guides Engine, Drivetrain & Forced-Induction (DIY) Brakes & Suspension (DIY) Body, Interior, Exterior & Lighting (DIY) Repairing & Detailing (DIY) Audio, Video & Electronics (DIY) Marketplace the *new* my350 Marketplace Vendor Classifieds - Archive Audio Video Body Exterior Brakes Body Interior Coupons Drivetrain Engine Misc. 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