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displaying posts 1 to 9 of 9
| Author | Subject: Compression Test Results - Help |
 gti6aus
Junior User  Location: Melbourne Registered: 24 Mar 2012 Posts: 58 Status: Offline |
Post #1
Hi allI am looking at a gti6 and got a compression test done on it. 4 - 175 3 - 180 2- 175 1 - 180 Don't want to get a crappy engine. I thought it should be around 200 psi across all 4 cylinders. Do these results suggest excessive wear? It didn't pull as hard as my other gti6 and I was thinking bad compression or a slipped belt. All opinions greatly appreciated. Cheers  ________________________________________ 1998 GTi6 Bianca White |
 Posted 1st May 2012 at 01:40
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gnrlee
Forum Admin Location: Leeds Registered: 20 Aug 2005 Posts: 8,878 Status: Offline |
Post #2
Over time engines show wear,.. I'd worry if they'd dropped 20psi over the course of a few monthsor if there was a vast difference in psi between chambers! and there could be other reasons why this 6 doesnt seem to pull as hard as your last one,.. i.e. sensors a more restricted airflow etc etc,.. just try to keep up with the maintenance jobs  ________________________________________ Proud Member of the ASTOR Owners Club |
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Posted 1st May 2012 at 02:29
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b11 bob
Banned! Location: birmingham Registered: 19 Dec 2010 Posts: 265 Status: Offline |
Post #3
gti6aus wrote: Sounds about right to me the results vary depending on the gauge whether done on a cold engine or when warm.I done one recently and got 100 psi on all 4 cylinders then done a leak down test which showed the engine to be in perfect condition so the compression test results you have got i would say you got a good engine Hi all I am looking at a gti6 and got a compression test done on it. 4 - 175 3 - 180 2- 175 1 - 180 Don't want to get a crappy engine. I thought it should be around 200 psi across all 4 cylinders. Do these results suggest excessive wear? It didn't pull as hard as my other gti6 and I was thinking bad compression or a slipped belt. All opinions greatly appreciated. Cheers ________________________________________ 205 GTI6 235 bhp at 7400 rpm |
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Posted 1st May 2012 at 02:33
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stan_306gti6
Forum Admin Location: Kent Registered: 18 Jan 2004 Posts: 21,768 Status: Offline |
Post #4
You say that Bob but I am running a compression ratio of 8:1 and I still get about 165psi. Standard compression is 10.8:1 so you would expect higher. Most decent engines will give out around the 200-210psi.However, as Bob says it will depend on the conditions the test was done under. The engine should have been warm and the throttle should have been wide open to get the most accurate result.  ________________________________________ "Supercharged - 454.1bhp/317.5lb/ft"Peugeot 306 GTi-6 2000 (X), Moonstone  |
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Posted 1st May 2012 at 11:40
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adam b
Seasoned Pro  Location: The Nam Registered: 24 Jan 2006 Posts: 12,828 Status: Offline |
Post #5
Completely depends on the tester - look at the differences between the cylinders rather than overall figure. Had a few testers over the years and they've never been the same.Stan - your car might make 135 on his tester  ________________________________________ Nothing to see here |
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Posted 1st May 2012 at 11:43
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welshpug!
Capt Pedantic  Location: Bigend, Wales. Registered: 27 Mar 2007 Posts: 25,817 Status: Offline |
Post #6
100 psi sounds like the throttle was closed....those figures look just fine, if it doesn't pull as hard check the cam timing. ________________________________________ need a part number? get on here - http://public.servicebox.peugeot.comBring on the Trumpets. |
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Posted 1st May 2012 at 11:45
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rikky
🦔 Location: cheshire Registered: 28 Feb 2004 Posts: 26,793 Status: Offline |
Post #7
adam b wrote: Stan - your car might make 135 on his tester  ________________________________________ 306 rallye reproduction decals (full sets/individual decals) | 306 b-pillar textured vinyl weatherstrips306 slam panel esso stickers | 306 yellow / orange / pension fund red side door badges gti6 inlet manifold badges | 306 rear boot badges (p2/p3) winner of Extraction of toys from prams with outstanding vigour award 2009 [source: gti6 owners club] |
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Posted 1st May 2012 at 11:49
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miles
Seasoned Pro  Location: Ringwood Registered: 28 Dec 2002 Posts: 3,433 Status: Offline |
Post #8
Bit low, even my 285k engine still shows 200psi ________________________________________ 306 Rallye Sptint/Race Car, 205 CTI 1.9 8v to name a fewRoad, Track and Race/Rally car preparation to your personal requirements, Full Workshop & Diagnostic Facilities New and Second parts, from Plugs to Turbo's We now also carry out Routine Servicing www.pugracing.com & FB Page, https://www.facebook.com/PugRacing Ebay; http://stores.ebay.co.uk/Pug-Racing-Shop 2012/2013/2014/2019 Class Winners at Gurston Down Speed Hillclimb & Joint overall, Class record too along the way, |
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Posted 1st May 2012 at 13:00
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stan_306gti6
Forum Admin Location: Kent Registered: 18 Jan 2004 Posts: 21,768 Status: Offline |
Post #9
miles wrote: Bit low, even my 285k engine still shows 200psi That was the point I was trying to make. These engines provided they are looked after should still retain that sort of compression figure. I also agree with Meirion get the cam timing checked and altered if need be.  ________________________________________ "Supercharged - 454.1bhp/317.5lb/ft"Peugeot 306 GTi-6 2000 (X), Moonstone |
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Posted 1st May 2012 at 13:24
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