Chris:
The oil pressure is good (by the dash guage). No smoke at all. The =
odometer shows 56K.
I'll try it again with the oil, and maybe a different guage. Is it =
possible I didn't perform the test correctly? I cranked it for about 3-4 =
turns on each cylinder.
I figured I'd be replacing the entire head with an unleaded one anyway, =
just didn't want to do it so soon and I'm tapped anyway from the =
purchase as it is! (sigh)
Dan
----------
From: Chris Delling
Sent: Sunday, January 11, 1998 4:49 PM
To: DANIEL RAY
Subject: Re: Battery in the Trunk? Compression
If these compression numbers are correct, you a running real low. An
engine in good condition should run 130-170 or so. How is your oil
pressure? Does the car smoke a lot? Try pouring about a tablespoon of =
oil
into the sparkplug hole, and rerun the compression test. Did it go up
significantly, chances are the rings are shot (at least). If it remains
the same, it's probably the valves.
Chances are the car will need a valve job. When you do it, go with
hardened seats, and stainless or stellite type exhaust valves, and =
bronze
guides, to ensure compatability with unleaded gas. Before buying the
parts, have the head checked for cracks.
How many miles on the car? If less than 100K, and good oil pressure, =
you
may be able to re-ring the pistons if the rings are bad. You will need =
to
inspect the cylinder walls for scoring, and potentially a step at the =
top
of the bore.
At 04:34 PM 1/11/98 -0600, you wrote:
>Listers:
> Well, I did my first check of the '73 B today.=20
> I also ran a compression check -- not very good numbers. Three of the
cylinders are showing 75-80 and one is at about 55! Could this one be a
burnt valve? Its a lead-head (original I think) and has been run on
unleaded gas with lead additive for a while by the PO. What are the =
chances
that a new head will solve the problem? How BAD are these compression
numbers? Should I suspect the well-used guage or are they bullet-proof? =
The
car runs strong but does have a slight miss, I'm thinking probably from =
the
one weak cylinder.
>Any suggestions or comments?
>TIA
>Dan
>
>
|