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Joined: Aug 2002
Posts: 1,228
Hard-core CEG\'er
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Hard-core CEG\'er
Joined: Aug 2002
Posts: 1,228 |
The only other possibility I can think of is that there may be some oil on the cylinder walls from doing the rework. The extra sealing that it would cause may bump the psi up a little (or Kg/CM  ). Have you tried running the engine yet? If it is oil (I mean a thin coating, not liquid) it will go away after running the motor. I\As I think here, are the ring gaps O.K.? But thats about it. Funny, most people have trouble with low compression.
My name is Richard. I was a Contouraholic.
NOW: '02 Mazda B3000 Dual Sport, Black
BEFORE: '99 Contour SE Sport
Duratec ATX Spruce Green
PIAA 510's, Foglight MOD, K&N Drop-in
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Joined: Mar 2002
Posts: 2,319
Hard-core CEG'er
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Hard-core CEG'er
Joined: Mar 2002
Posts: 2,319 |
Originally posted by windrain:
Hi, it's my mondeo that is impersonating a diesel.
.....
The compression pressure is 225 psi. It should be between 130 and 215 psi. ...
Welcome onboard.
Not sure where you got those specs, or how you translated them to compression ratios quoted in Bill's post above, however 225 doesn't seem far off, only +5%.
Can't find compression ratio or pressure spec in my service manual. All it says is lowest cylinder compression should be at least 75% of highest. Manual then gives a table to do the math for you by listing highest pressure from 134psi to 222psi and giving the corresponding 75% lowest pressure figure.
So, unless you exceed the variation spec, you are probably OK.
98 Mystique LS v6 atx 163,000km
97 Contour LX v6 atx 163,000km
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Joined: Feb 2004
Posts: 48
New CEG\'er
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New CEG\'er
Joined: Feb 2004
Posts: 48 |
Car is very hard to start if that is relevant.
Standard gasket sets were used, they were very thin in any case. Nothing non-standard done with sealant either.
I don't think there is any heavy oil or grease in the cyclinders as there is no smoke or smell and engine has been driving for 200 miles.
Ring gaps is a possibility.
Does anybody know if Ford tried out new pistons and rings from the 2000 contour in Europe first, in which case I would have needed the newer rings?
The problem in Ireland is that Ford only do two engine parts, bottom end and top end and seem to know or care nothing about parts.!
Thanks, guys.
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Joined: Nov 2001
Posts: 1,176
CEG'er
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CEG'er
Joined: Nov 2001
Posts: 1,176 |
When the compression is found to be too high in one or more cylinders, this would be an indication of excessive carbon build up in the engine. This can only be corrected by performing a chemical de-carbonizing process on the engine (specialized service), or by removing the cylinder head(s) and physically removing the carbon that is attached to the cylinder portion of the head(s) and the tops of the pistons.
With your engine work did you remove the cylinder heads? Were they cleaned and/or the pistons cleaned als? Was there any carbon build up?
Obvious question, did you use new plugs.....
An ounce of prevention provides a pound of cure!
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Joined: Sep 2000
Posts: 9,602
Hard-core CEG'er
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Hard-core CEG'er
Joined: Sep 2000
Posts: 9,602 |
Rings do nothing for compression ratio.
A compression test is affected by many factors including elevation and barometric pressure.
Even if you ran NO head gasket (ZERO compressed height) verses the stock 1mm compressed height it would only raise the compression ratio by 1 point.
Like I told you on the NECO site Bill. Something is fishy and it's definitely not either of those two parts!
2000 SVT #674
13.47 @ 102 - All Motor!
It was not broke; Yet I fixed it anyway.
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Joined: Feb 2004
Posts: 48
New CEG\'er
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New CEG\'er
Joined: Feb 2004
Posts: 48 |
A chemical de-carbonising process was performed prior to the crank going. Compression was normal then. Heads were removed on rebuild and as much as possible cleaned up.
Engine has now done some 300 miles and no change so I don't think it is oil or grease in the cyclinders.
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Joined: Feb 2004
Posts: 48
New CEG\'er
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New CEG\'er
Joined: Feb 2004
Posts: 48 |
Electrics and fueling have been tested with no faults found.
Emissions ok also.
I've run out of ideas!
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Joined: Jun 2003
Posts: 1,145
Hard-core CEG\'er
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Hard-core CEG\'er
Joined: Jun 2003
Posts: 1,145 |
its your flux capicator my does it all the time
but really no the only thing that can effect this would be what is listed about, it probably the ring gap and or placement of the gaps, in my honda they had to be a special way, dont know if this is true for duratec's
98.5 Black SE ATX
S&B filter, SVT MAF, optimized SVT TB, mesh grille, removed orange reflectors, painted rear reflector, gutted pre-cats, optimized SVT LIM, 19lb injectors, resonator removed
cant afford an svt but lookin for 1 in nc
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Joined: Feb 2004
Posts: 48
New CEG\'er
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New CEG\'er
Joined: Feb 2004
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Never thought of the flux capicitor.
I must check that last year when I get a chance.
Does anyone know of any special fitting instructions for the rings?
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Joined: Feb 2004
Posts: 48
New CEG\'er
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New CEG\'er
Joined: Feb 2004
Posts: 48 |
I've changed the oil from 5/50 to 15/50 and the car is much better, but not perfect.
Does anyone have views on oil thickness.
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