24th September 2008, 07:09 PM
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#1 (permalink) |
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GTR Register Member
Join Date: Feb 2004
Location: londonish
Posts: 1,472
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0 compression
hi
had an issue with the skyline last night...was on the motorway at about 70mph in 4th when i gave it a bit of gas, i saw max boost and then the knocklink lit up, i came off the throttle straight away no noises from the engine, no smoke, no nothing but no power under throttle and no restart....will not fire  as far as i was concerned this was most likely an electrical issue not an engine issue but today i pulled the sparkplugs and comp tested (with a new untested compression tester) just incase 0 compression  ....i tested 4 cylinders and didnt bother with the other 2, i think there was 25psi on piston 3the engine was a home build and had done about 15-20 thousand miles since i rebuilt about 2 years ago, doing it again is no big deal i guess i find 0 compression on all cylinders odd TBH, what do you think? |
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24th September 2008, 07:40 PM
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#4 (permalink) |
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HardcoRe GTROC Member
Join Date: Mar 2006
Location: in your mum's knicker drawer
Posts: 3,984
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Ah sh1t, hope you get it sorted bud, i've never heard of the compression on all cylinders going though?
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Ben スミグズ My GTR Development Thread - Team QM1 GTROC North West Regional Rep Life is not a journey to the grave with the goal of arriving safely in a prettily preserved body, but rather to skid in sideways in a shower of gravel and party shards - thoroughly used, utterly exhausted and loudly proclaiming "f**k me, that was brilliant!!" |
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24th September 2008, 08:10 PM
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#5 (permalink) | |
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GTR Register Member
Join Date: Feb 2004
Location: londonish
Posts: 1,472
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Quote:
i had to put something down the hole to see if the pistons were still there lol dodgy compression tester maybe, might swap it over with another tomorrow and retest.....maybe thats grabbing at straws lol |
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24th September 2008, 09:35 PM
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#10 (permalink) |
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GTR Register Member
Join Date: Feb 2002
Location: The workshop...
Posts: 1,912
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better have a look a the cam timing and valve clearances I think.
Have you got a cylinder leakage tester or if not cobble something up to allow you to pressurise the cylinders , you can then tell where the compression is escaping to |
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24th September 2008, 09:41 PM
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#11 (permalink) |
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GTROC Member
Join Date: Feb 2008
Location: Bucks
Posts: 820
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do you have adjustable pulleys?
could one of them have slipped and put the valves out? cant be cambelt as engine wouldnt do anything obviously. i think its going to be head off time!
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24th September 2008, 09:56 PM
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#12 (permalink) |
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GTR Register Member
Join Date: Nov 2003
Location: Lancashire
Posts: 514
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i thought skipped teeth on cambelt
bummer though least its not to bad to fix had one last week the fanbelt tensioner had gone and as the fanbelt snagged for a second it jumped one tooth on cambelt clockwise and one on the diesel pump anticlockwise (pug diesel) no damage done new belt fixed it  Last edited by Darbo; 24th September 2008 at 09:59 PM. |
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24th September 2008, 10:15 PM
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#15 (permalink) |
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GTROC Member
Join Date: Feb 2008
Location: Bucks
Posts: 820
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you wouldnt have thought so. epec not for a couple of teeth. it couldnt have jumped that far.
would love to know what happened! as you probably do i imagine! haha
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