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Author Topic: engine compression specs  (Read 1682 times)

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Doctor Gollum

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Re: engine compression specs
« Reply #15 on: 29 January 2018, 15:00:35 »

i do get engine rock. and sometimes it dont like to go up a hill have to drop down an gear sometimes 2, just started engine up and idle has gone up so think will have to leave it till the oil has dropped down, past the rings, over night should be fine. but main problem was starting engine run up road for 5-6 miles and its gray white smoke,, but had engine head test done and no leaks on that and now water lose. could it be the fuel ????
If it's only the 8v lump, then it has its work cut out shifting an Omega sized lump around... changing down a couple of gears could be considered normal... :-\

120bhp when new, less about 20% to drive the slushbox :-X
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Chazza12

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Re: engine compression specs
« Reply #16 on: 29 January 2018, 15:09:51 »

its 16v.  engine.  Dr Gollum. pulls away ok . could it be a weak fuel pump. or would engine management say something if it was that, lose increase at 60 to 70 motorway driving, seems like its holding back ???
need to try and get this figured out as in hospital next week, as liver failing was hoping to get something doe before i have to do nothing for 6 weeks.
« Last Edit: 29 January 2018, 15:12:59 by Chazza12 »
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Chazza12

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Re: engine compression specs
« Reply #17 on: 29 January 2018, 15:18:43 »

i do get engine rock. and sometimes it dont like to go up a hill have to drop down an gear sometimes 2, just started engine up and idle has gone up so think will have to leave it till the oil has dropped down, past the rings, over night should be fine. but main problem was starting engine run up road for 5-6 miles and its gray white smoke,, but had engine head test done and no leaks on that and now water lose. could it be the fuel ????
If it's only the 8v lump, then it has its work cut out shifting an Omega sized lump around... changing down a couple of gears could be considered normal... :-\

120bhp when new, less about 20% to drive the slushbox :-X
its done 149,634 miles ??
« Last Edit: 29 January 2018, 15:20:14 by Chazza12 »
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Chazza12

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Re: engine compression specs
« Reply #18 on: 29 January 2018, 15:21:55 »

I rebuilt my C36GET engine last year. Book compression ration is 8.2:1. Measured wet pressures on all 6 were 12 bar (176 psi) +/- perhaps 0.5 bar.

So my take is that all these figures are on the low side for a 10:1 compression ratio - but I don't know anything about the X20XE engine, and I have no calibration data for my pressure gauge, and you have no calibration for yours So lots of unknowns.

The fact that in your results they're all very close says there isn't anything dramatically wrong with any particular cylinder. Doubt it's valve related. It could be overfueling, but you'd expect the lambda sensors to be complaining big time if it were that. How many miles on the engine? If it's a high miler could also be worn rings and/or bores.
[/quote] its done 149,634 miles,     

sorry dont know how this quote thing works lol

« Last Edit: 29 January 2018, 15:30:40 by Chazza12 »
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Fuse 19

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Re: engine compression specs
« Reply #19 on: 29 January 2018, 15:30:03 »

Those pressure are pretty good, particularly given the typically low ambient pressure and the variance in gauges.

Also, the oil test is pretty much useless as next to nothing will get to the rings due to where the plug holes are (centre of the bore) and the slight dish in the piston tops. It will give a slight increase in compression purely down to the fact there is now less space at TDC.  :y

If you are getting the behaviour you describe, check the timing carefully and also check the coil pack (it should fire a spark across a 40mm gap at ambient pressures)
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LC0112G

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Re: engine compression specs
« Reply #20 on: 29 January 2018, 15:35:11 »

its 16v.  engine.  Dr Gollum. pulls away ok . could it be a weak fuel pump. or would engine management say something if it was that, lose increase at 60 to 70 motorway driving, seems like its holding back ???
need to try and get this figured out as in hospital next week, as liver failing was hoping to get something doe before i have to do nothing for 6 weeks.

If it's your only mode of transport then I'd leave well alone till after you're well enough to fix it - which hopefully will be swift.

Bad lambda sensors can cause similar effects. Not sure if I'm supposed to reveal ABS secrets on here - but the C30SE has an IanM wooo-waaa test and it may work on other Bosch fuel systems. Basically on a warm engine, in neutral, hold the throttle part open - say 3000 rpm. If the engine speed varies slowly the noise you hear will be like a Woooo-Waaaaaaa-Woooooo-Waaahhh sound rather than a constant Woooooooo. Try it at other RPM's. On a C30SE this is symptomatic of a failing lambda sensor, and if you know what you're listening for it can be detected long before the engine management light comes on.     
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Fuse 19

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Re: engine compression specs
« Reply #21 on: 29 January 2018, 16:16:51 »

I should also add, when was the fuel filter last changed?
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Chazza12

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Re: engine compression specs
« Reply #22 on: 29 January 2018, 16:25:19 »

its 16v.  engine.  Dr Gollum. pulls away ok . could it be a weak fuel pump. or would engine management say something if it was that, lose increase at 60 to 70 motorway driving, seems like its holding back ???
need to try and get this figured out as in hospital next week, as liver failing was hoping to get something doe before i have to do nothing for 6 weeks.

If it's your only mode of transport then I'd leave well alone till after you're well enough to fix it - which hopefully will be swift.

Bad lambda sensors can cause similar effects. Not sure if I'm supposed to reveal ABS secrets on here - but the C30SE has an IanM wooo-waaa test and it may work on other Bosch fuel systems. Basically on a warm engine, in neutral, hold the throttle part open - say 3000 rpm. If the engine speed varies slowly the noise you hear will be like a Woooo-Waaaaaaa-Woooooo-Waaahhh sound rather than a constant Woooooooo. Try it at other RPM's. On a C30SE this is symptomatic of a failing lambda sensor, and if you know what you're listening for it can be detected long before the engine management light comes on.   
, I had the lombard sensor changed a 2 years ago, after garage stripped the threads on it, hum spark plugs done last year with new leads, new coil pack as well, oil changed august with oil filter, timing belt and water pump and runners feb last year or march. replaced manifold as had what looked like a crack  in between 2 and 3 ports. replacement cat (garage changed) did this and brock the sensor.  had a water pressure test last week, leaks friend of mine did this has he had the tool at the time. have loads of other things done before i received the car, nearly a full history from second owner. fuel filter was changed 4 years ago according to previous own and fuel line.  but nothing on the fuel pump in paper work. brake lines abs bit of welding steering idler and other stuff like cambelt changes etc,
i've tried the valve on the injector rail it don't exactly squirt out, bit hard to explain. its like a wibbwibed out. not squirty sound.  get more from a fish fart it that helps lol bit hard to find the words. 
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Fuse 19

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Re: engine compression specs
« Reply #23 on: 29 January 2018, 16:30:18 »

How many miles since the fuel filter was done?

I have seen them where they get clogged and effectively become a rev limiter!
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Chazza12

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Re: engine compression specs
« Reply #24 on: 29 January 2018, 16:30:27 »

I going to have to leave it for today my brain etc is finding it hard to see what my eyes are seeing, everything getting blurry. 
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Chazza12

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Re: engine compression specs
« Reply #25 on: 29 January 2018, 16:32:40 »

How many miles since the fuel filter was done?

I have seen them where they get clogged and effectively become a rev limiter!
4 years ago at a garage. says extra replaced fuel line so think that means the connections for the filter. brain and eyes fogging up. i will have a look later when things come back to normal going to have to have a lay down.
« Last Edit: 29 January 2018, 16:35:39 by Chazza12 »
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Chazza12

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Re: engine compression specs
« Reply #26 on: 29 January 2018, 17:05:18 »

hi this chazzas wife it was last changed 42thou miles ago if that helps.
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Chazza12

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Re: engine compression specs
« Reply #27 on: 29 January 2018, 21:11:49 »

feel a bit better now had a kip. cannot wait till friday and see if they can sort me out, anyway think the filter is well past its change and been looking around, is this one any good says GM poland made 25313359 says it fits a lot of vauxhalls OMEGA B 1994 - 2003 but also has this product code as well  818568 on this one site. ??? but this one has a pic and it says GM on the sticker https://www.ebay.co.uk/itm/Genuine-Vauxhall-In-Line-Petrol-Fuel-Filter-With-Clips-25313359/292296981550?_trkparms=aid%3D333008%26algo%3DRIC.MBE%26ao%3D1%26asc%3D49925%26meid%3D25858cd5b6f9487f9d3a11544af585c5%26pid%3D100010%26rk%3D1%26rkt%3D6%26sd%3D112752806563%26itm%3D292296981550&_trksid=p2047675.c100010.m2109 but know these can be faked.
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Chazza12

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Re: engine compression specs
« Reply #28 on: 29 January 2018, 21:46:38 »

a friend of mine has just told me over the phone there is a filter in the fuel regulator( on the fuel rail ) can this one be changed as well or dose it need to be replaced if foul up as cannot see a reference number for a part of the filter just diagram of how its fitted ? 
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Doctor Gollum

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Re: engine compression specs
« Reply #29 on: 29 January 2018, 22:21:27 »

There isn't  ::)

Pre (coarse) filter on the pump, main (fine) filter next to the diff :y
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