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displaying posts 1 to 12 of 12
| Author | Subject: compression test hi comp engine |
 velar
Regular  Location: swindon Registered: 04 Jan 2009 Posts: 448 Status: Offline |
Post #1
What pressure should I expect on a hi compression engine (woosner pistons ) My guage measured over 290PSI on all cylinders. (nearly end stopping the meter!!) which the interweb tells me equates to around 14:1 !!! ________________________________________ L reg "black and blue" phase 1 track 6 |
 Posted 9th Sep 2011 at 21:07
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allanallen
Seasoned Pro  Location: Buxton Registered: 01 May 2007 Posts: 1,399 Status: Offline |
Post #2
Mine with je's (11.5:1) measured 225 psi.Remember cams and cam timing effect your compression. Al ________________________________________ www.bridgecraftmotorsport.co.uk |
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Posted 9th Sep 2011 at 21:20
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bigbadbowen
Seasoned Pro  Location: Winchester Registered: 21 Nov 2003 Posts: 13,753 Status: Offline |
Post #3
seems a bit high to me ? what cams are you running ? |
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Posted 9th Sep 2011 at 21:23
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velar
Regular Location: swindon Registered: 04 Jan 2009 Posts: 448 Status: Offline |
Post #4
piper 285hs________________________________________ L reg "black and blue" phase 1 track 6 |
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Posted 9th Sep 2011 at 21:32
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phillipm
Seasoned Pro  Location: Rotherham Registered: 15 Oct 2006 Posts: 20,607 Status: Offline |
Post #5
That's high as hell with 285's.What does it read with a normal engine? Might just the tester is out a fair way. My Tu on 10.8:1 with a road cam (advanced slightly) knocks about 230 across all 4 pots on my meter. ________________________________________ - Bespoke rollcages/additions/adjustments. Half cages right up to complete custom spaceframes - MSA/FIA spec, CDS, ROPT, T45, etc - PM meEmail me! Custom-made polybushes available - need an odd size or fitment? - anything from batch work to one-off pieces. |
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Posted 9th Sep 2011 at 21:52
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velar
Regular Location: swindon Registered: 04 Jan 2009 Posts: 448 Status: Offline |
Post #6
Good call, could be the meter, will try it on a standard xu and see.________________________________________ L reg "black and blue" phase 1 track 6 |
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Posted 9th Sep 2011 at 22:01
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dav1
Regular Location: leek/staffs Registered: 20 Jun 2011 Posts: 312 Status: Offline |
Post #7
Wat do the 11.5.1 or 10.4.1 figures realate too?________________________________________ 230bhp 205 gti6 |
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Posted 9th Sep 2011 at 22:57
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velar
Regular Location: swindon Registered: 04 Jan 2009 Posts: 448 Status: Offline |
Post #8
The ratio of volume in the cylinder with the piston at it lowest and highest points.________________________________________ L reg "black and blue" phase 1 track 6 |
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Posted 9th Sep 2011 at 23:11
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mabgti
NV motors  Location: Bham tunnel @7400rpm Registered: 28 Aug 2003 Posts: 9,127 Status: Offline |
Post #9
290psi.. did you do the test with no fuel and wet tests?________________________________________ Team Supercharged Gti-6NV Motorsport Automotive Performance Tuning 0121 448 7515 ECU Remapping/ DPF removal VAG/BMW Diag and Option Coding Peugeot Planet ECU coding/transponder programming etc www.nvmotorsport.com Facebook Page Project S6 |
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Posted 21st Sep 2011 at 23:28
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velar
Regular Location: swindon Registered: 04 Jan 2009 Posts: 448 Status: Offline |
Post #10
no fuel ( infact no inlet manifold) but what are wet tests________________________________________ L reg "black and blue" phase 1 track 6 |
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Posted 22nd Sep 2011 at 00:04
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daveyboy
aka Jim Davey  Location: Southampton Registered: 01 Oct 2007 Posts: 8,648 Status: Offline |
Post #11
On a standard engine dry I saw between 190 and 205 psi, this was on my 111,000 mile old engine though but the bores looked good as new on strip down. Did you CC the combustion chambers and work out the volume of the piston intruder dome when you built it? I ended up wih around 12.7:1 using Wossner high comp pistons, saying that though a small amount of material was removed from the combustion chambers as they were reworked for better burn.________________________________________ R H Davey Welding Supplies. I sell new and used welding equipment in the Hampshire area. I take on welding jobs in the evenings, ally casting repairs are one of my specialities but I can weld pretty much anything. PM me with your requirements.Some of my services: (See my for sale threads) Engine mount/chassis repair Solid Beam Mounts BACK IN PRODUCTION Harness bars |
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Posted 22nd Sep 2011 at 12:21
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rich_w
Seasoned Pro  Location: Havant, Hampshire Registered: 29 Jul 2004 Posts: 5,412 Status: Offline |
Post #12
290 PSI is probably about right for that setup IMO.The Wossner pistons are around 12.2:1, and as a rule of thumb you would expect to see 17-20 times the CR on a standard engine (say circa 240 PSI). Given you’ve got longer duration / higher lift cams, you will have a higher volumetric efficiency, which will increase the cylinder filling ability further. The fact you had no manifold, air filter attached when you did the test will also increase the results of a compression test as there’s no plenum to form a vacuum in around the ports on the cylinder head. ________________________________________ Contact Details:rich@lynxpowerengineering.co.uk 07732 822546 |
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Posted 23rd Sep 2011 at 12:49
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