[v12-engine] compression values

Had some good commentary, but can’t anyone tell me if these values are good,
bad, or otherwise?
Does anyone know what it rolls off the showroom floor with??
My compression readings were as follows

1a 170 1b 180
2a 175 2b 175
3a 170 3b 180
4a 175 4b 180
5a 180 5b 190
6a 180 6b 180

Thanks,

James Robinson

(Do I worry more about that 190, or about the 170s?)
And what action (if any,) should I take?

Had some good commentary, but can’t anyone tell me if these values are
good, bad, or otherwise? Does anyone know what it rolls off the
showroom floor with?? My compression readings were as follows

1a 170 1b 180
2a 175 2b 175
3a 170 3b 180
4a 175 4b 180
5a 180 5b 190
6a 180 6b 180

Thanks,

James Robinson

(Do I worry more about that 190, or about the 170s?)
And what action (if any,) should I take?

The engine is obviously shot to hell, time for an overhaul!

Get serious. There are only two choices of what to do with
compression readings on a car you already own: rebuild or ignore.
Nobody would consider a rebuild with these readings.

If you DON’T own the car, there is a different set of choices: offer
or pass. I wouldn’t even pass based on these readings.

Ask again when you have one cylinder reading half what the others do.

BTW, I think the 5.3 with 11.5:1 compression should read over 200 –
but there are so many variables it isn’t even worth talking about.
Battery condition, compression gauge calibration, ambient
temperature, even certain particulars about the testing procedure
could explain why yours are in the 170 range. That’s why nobody ever
advises being concerned about the numbers, but rather the variance
between the numbers.

– Kirbert | Palm’s Postulate:
| If anything is to be accomplished,
| some rules must be broken.
| – Kirby Palm, 1979From: “James A Robinson” jrobinson@EISA.COM

Oops!

It’s a 1987, Canadian spec. (meaning air pump, but only one set of cats)

Thanx,
James Robinson.----- Original Message -----
From: “bob” rgallivan@monmouth.com
To: “James A Robinson” jrobinson@EISA.COM
Sent: Sunday, April 16, 2000 11:32 AM
Subject: Re: [v12-engine] compression values

what year ?

James A Robinson wrote:

Had some good commentary, but can’t anyone tell me if these values are
good,

bad, or otherwise?
Does anyone know what it rolls off the showroom floor with??
My compression readings were as follows

1a 170 1b 180
2a 175 2b 175
3a 170 3b 180
4a 175 4b 180
5a 180 5b 190
6a 180 6b 180

Thanks,

James Robinson

(Do I worry more about that 190, or about the 170s?)
And what action (if any,) should I take?