minimaniac
New member
hello, can someone tell me what the compression should be across the board for a seicento sporting please?
General seicento compression
- Thread starter minimaniac
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General seicento compression
You're not really looking for an across the board figure, more significant variations across cylinders or a big increase between dry and wet figures.
Post your readings, someone will comment.
Post your readings, someone will comment.
minimaniac
New member
Well i need to know what the comp is as im going to look at one over the weekend and i want to check it.
It all depends on how you do it, so as fingers kindly suggests, whatever your method, the idea is to look for differences.
Cheers
PD
Cheers
PD
what do you mean "dry/wet"?
What is the correct way to do a comp test? - I kinda thought it was just coil packs unlpugged, plug out, tester in - turn ignition & take reading?...
What is the correct way to do a comp test? - I kinda thought it was just coil packs unlpugged, plug out, tester in - turn ignition & take reading?...
All plugs out, throttle fully open, engine up to operating temperature. Write the readings down.
That's the dry one.
Then you put a teaspoon of oil in cylinder 1, repeat the test, then cylinder 2, and so on.
This is the idea. The dry readings will show up a blown head gasket. Or something wrong when one cylinder is way out.
If the reading on a cylinder improves markedly "wet" then the bores/rings/piston on that cylinder are deeply suspect (the oil effectively "seals" the piston to the bore).
That's the dry one.
Then you put a teaspoon of oil in cylinder 1, repeat the test, then cylinder 2, and so on.
This is the idea. The dry readings will show up a blown head gasket. Or something wrong when one cylinder is way out.
If the reading on a cylinder improves markedly "wet" then the bores/rings/piston on that cylinder are deeply suspect (the oil effectively "seals" the piston to the bore).
Sorry to sound dumb here, but I still don't think I fully understand it;
So let's see if I have this right:
*take the car for a run
*disconnect coils and remove all the plugs
*hold throttle pedal down while turning the ignition
*let it crank 4-5 times and take the readings
This sound about right?
So let's see if I have this right:
*take the car for a run
*disconnect coils and remove all the plugs
*hold throttle pedal down while turning the ignition
*let it crank 4-5 times and take the readings
This sound about right?
That'll do, but you ommitted the wet bit.
