Chris,

Thank you for your reply. You won't scare me as I am not mentally ready
for the worse but hoping for the best.

Thanks,


"c" <c@me.org> wrote in message
news:GCQWb.5218$_66.4336@twister.rdc-kc.rr.com...
> Mike,
>
> It is most common for racers to use leakdown to test the condition of
their
> engine, but there is much more you can diagnose with it. An engine can
show
> relatively good compression numbers and still have a problem, but not
> necessarily all the time. For instance, a head gasket that has started to
> seep (and will fail eventually) doesn't always get detected with a
> compression test due to the short time the cylinder sees pressure while
> cranking the engine. A leakdown test will find that seeping gasket if the
> air is left on long enough. I have also detected a bad exhaust valve with
a
> leakdown that wasn't detected with a compression test. This particular
> engine ran fine, except for an very infrequent pop out the exhaust pipe.
The
> leakdown showed it was only holding 40% as compared to 80-85 for the other
> cylinders. When we tore the heads off, there was an exhaust valve with a
> small crack from the stem out to the valve seat. I would bet that
eventually
> this valve would have broke and caused some serious damage. It was on a
> Dodge 440 that got driven pretty hard.
>
> After looking at the numbers Bill got, and thinking about it a bit, he
> "might" have a problem with one of the rings on that piston. I wouldn't
> diagnose it as this until all the of other possibilities are checked. I
> didn't want to scare him by posting this, and I think you were also right
in
> saying that he should check the injector for that cylinder before he tears
> into the engine. Without any of us actually seeing his plug coloring, it
is
> hard to diagnose the problem. It may not be oil on the plug, or the oil
may
> be getting there because the extra gas is washing the cylinder down which
> will not let the oil control ring work like it should. I hope for his sake
> it is something like a bad injector, and because he bought his EFI kit
used,
> there is a good possibility of that.
>
> Chris
>
>
> "Mike Romain" <romainm@sympatico.ca> wrote in message
> news:402BBEB4.D3763E0D@sympatico.ca...
> > Ok, I am curious...
> >
> > Do you have any idea just what those numbers represent or mean? I
> > really don't.
> >
> > I am taking a wild assed guess and am thinking those represent the shape
> > of the valve seats. You did say you had some play in the valve stems on
> > #2 right? This will make a strange oval wear pattern on the valve
> > seating area.
> >
> > I mean the compression is way up there like a new engine, so things like
> > rings and gaskets are fine. The book says a new 258 should have 140-150
> > psi compression, but most important is even compression.
> >
> > Your compression is 'perfect'.
> >
> > It must be the seats of the metal parts that the leak down test
> > tests???
> >
> > I honestly have never seen or heard of in person anyone doing that kind
> > of test. I have only heard about it on the internet and thought it was
> > a way to test a racing engine after a fresh rebuild like they do every
> > second race or so.
> >
> > Mike
> > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > 88 Cherokee 235 BFG AT's
> >
> > William Oliveri wrote:
> > >
> > > Offical Complete results of the Leak down test with the proper fitting
> is as
> > > follows:
> > >
> > > #1 -- 14.4%
> > > #2 -- 24.5%
> > > #3 -- 17.7%
> > > #4 -- 11.1%
> > > #5 -- 10.0%
> > > #6 -- 13.3%
> > >
> > > Just for the record.
>
>

 

Chris,

Thank you for your reply. You won't scare me as I am not mentally ready
for the worse but hoping for the best.

Thanks,


"c" <c@me.org> wrote in message
news:GCQWb.5218$_66.4336@twister.rdc-kc.rr.com...
> Mike,
>
> It is most common for racers to use leakdown to test the condition of
their
> engine, but there is much more you can diagnose with it. An engine can
show
> relatively good compression numbers and still have a problem, but not
> necessarily all the time. For instance, a head gasket that has started to
> seep (and will fail eventually) doesn't always get detected with a
> compression test due to the short time the cylinder sees pressure while
> cranking the engine. A leakdown test will find that seeping gasket if the
> air is left on long enough. I have also detected a bad exhaust valve with
a
> leakdown that wasn't detected with a compression test. This particular
> engine ran fine, except for an very infrequent pop out the exhaust pipe.
The
> leakdown showed it was only holding 40% as compared to 80-85 for the other
> cylinders. When we tore the heads off, there was an exhaust valve with a
> small crack from the stem out to the valve seat. I would bet that
eventually
> this valve would have broke and caused some serious damage. It was on a
> Dodge 440 that got driven pretty hard.
>
> After looking at the numbers Bill got, and thinking about it a bit, he
> "might" have a problem with one of the rings on that piston. I wouldn't
> diagnose it as this until all the of other possibilities are checked. I
> didn't want to scare him by posting this, and I think you were also right
in
> saying that he should check the injector for that cylinder before he tears
> into the engine. Without any of us actually seeing his plug coloring, it
is
> hard to diagnose the problem. It may not be oil on the plug, or the oil
may
> be getting there because the extra gas is washing the cylinder down which
> will not let the oil control ring work like it should. I hope for his sake
> it is something like a bad injector, and because he bought his EFI kit
used,
> there is a good possibility of that.
>
> Chris
>
>
> "Mike Romain" <romainm@sympatico.ca> wrote in message
> news:402BBEB4.D3763E0D@sympatico.ca...
> > Ok, I am curious...
> >
> > Do you have any idea just what those numbers represent or mean? I
> > really don't.
> >
> > I am taking a wild assed guess and am thinking those represent the shape
> > of the valve seats. You did say you had some play in the valve stems on
> > #2 right? This will make a strange oval wear pattern on the valve
> > seating area.
> >
> > I mean the compression is way up there like a new engine, so things like
> > rings and gaskets are fine. The book says a new 258 should have 140-150
> > psi compression, but most important is even compression.
> >
> > Your compression is 'perfect'.
> >
> > It must be the seats of the metal parts that the leak down test
> > tests???
> >
> > I honestly have never seen or heard of in person anyone doing that kind
> > of test. I have only heard about it on the internet and thought it was
> > a way to test a racing engine after a fresh rebuild like they do every
> > second race or so.
> >
> > Mike
> > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > 88 Cherokee 235 BFG AT's
> >
> > William Oliveri wrote:
> > >
> > > Offical Complete results of the Leak down test with the proper fitting
> is as
> > > follows:
> > >
> > > #1 -- 14.4%
> > > #2 -- 24.5%
> > > #3 -- 17.7%
> > > #4 -- 11.1%
> > > #5 -- 10.0%
> > > #6 -- 13.3%
> > >
> > > Just for the record.
>
>

 

Correction. That is, I AM mentally ready for the worse but hoping for the
best.


"William Oliveri" <wuji@bigvalley.net> wrote in message
news:c0gn4a$174lnq$1@ID-193866.news.uni-berlin.de...
> Chris,
>
> Thank you for your reply. You won't scare me as I am not mentally
ready
> for the worse but hoping for the best.
>
> Thanks,
>
>
> "c" <c@me.org> wrote in message
> news:GCQWb.5218$_66.4336@twister.rdc-kc.rr.com...
> > Mike,
> >
> > It is most common for racers to use leakdown to test the condition of
> their
> > engine, but there is much more you can diagnose with it. An engine can
> show
> > relatively good compression numbers and still have a problem, but not
> > necessarily all the time. For instance, a head gasket that has started
to
> > seep (and will fail eventually) doesn't always get detected with a
> > compression test due to the short time the cylinder sees pressure while
> > cranking the engine. A leakdown test will find that seeping gasket if
the
> > air is left on long enough. I have also detected a bad exhaust valve
with
> a
> > leakdown that wasn't detected with a compression test. This particular
> > engine ran fine, except for an very infrequent pop out the exhaust pipe.
> The
> > leakdown showed it was only holding 40% as compared to 80-85 for the
other
> > cylinders. When we tore the heads off, there was an exhaust valve with a
> > small crack from the stem out to the valve seat. I would bet that
> eventually
> > this valve would have broke and caused some serious damage. It was on a
> > Dodge 440 that got driven pretty hard.
> >
> > After looking at the numbers Bill got, and thinking about it a bit, he
> > "might" have a problem with one of the rings on that piston. I wouldn't
> > diagnose it as this until all the of other possibilities are checked. I
> > didn't want to scare him by posting this, and I think you were also
right
> in
> > saying that he should check the injector for that cylinder before he
tears
> > into the engine. Without any of us actually seeing his plug coloring, it
> is
> > hard to diagnose the problem. It may not be oil on the plug, or the oil
> may
> > be getting there because the extra gas is washing the cylinder down
which
> > will not let the oil control ring work like it should. I hope for his
sake
> > it is something like a bad injector, and because he bought his EFI kit
> used,
> > there is a good possibility of that.
> >
> > Chris
> >
> >
> > "Mike Romain" <romainm@sympatico.ca> wrote in message
> > news:402BBEB4.D3763E0D@sympatico.ca...
> > > Ok, I am curious...
> > >
> > > Do you have any idea just what those numbers represent or mean? I
> > > really don't.
> > >
> > > I am taking a wild assed guess and am thinking those represent the
shape
> > > of the valve seats. You did say you had some play in the valve stems
on
> > > #2 right? This will make a strange oval wear pattern on the valve
> > > seating area.
> > >
> > > I mean the compression is way up there like a new engine, so things
like
> > > rings and gaskets are fine. The book says a new 258 should have
140-150
> > > psi compression, but most important is even compression.
> > >
> > > Your compression is 'perfect'.
> > >
> > > It must be the seats of the metal parts that the leak down test
> > > tests???
> > >
> > > I honestly have never seen or heard of in person anyone doing that
kind
> > > of test. I have only heard about it on the internet and thought it
was
> > > a way to test a racing engine after a fresh rebuild like they do every
> > > second race or so.
> > >
> > > Mike
> > > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > > 88 Cherokee 235 BFG AT's
> > >
> > > William Oliveri wrote:
> > > >
> > > > Offical Complete results of the Leak down test with the proper
fitting
> > is as
> > > > follows:
> > > >
> > > > #1 -- 14.4%
> > > > #2 -- 24.5%
> > > > #3 -- 17.7%
> > > > #4 -- 11.1%
> > > > #5 -- 10.0%
> > > > #6 -- 13.3%
> > > >
> > > > Just for the record.
> >
> >
>
>

 

Correction. That is, I AM mentally ready for the worse but hoping for the
best.


"William Oliveri" <wuji@bigvalley.net> wrote in message
news:c0gn4a$174lnq$1@ID-193866.news.uni-berlin.de...
> Chris,
>
> Thank you for your reply. You won't scare me as I am not mentally
ready
> for the worse but hoping for the best.
>
> Thanks,
>
>
> "c" <c@me.org> wrote in message
> news:GCQWb.5218$_66.4336@twister.rdc-kc.rr.com...
> > Mike,
> >
> > It is most common for racers to use leakdown to test the condition of
> their
> > engine, but there is much more you can diagnose with it. An engine can
> show
> > relatively good compression numbers and still have a problem, but not
> > necessarily all the time. For instance, a head gasket that has started
to
> > seep (and will fail eventually) doesn't always get detected with a
> > compression test due to the short time the cylinder sees pressure while
> > cranking the engine. A leakdown test will find that seeping gasket if
the
> > air is left on long enough. I have also detected a bad exhaust valve
with
> a
> > leakdown that wasn't detected with a compression test. This particular
> > engine ran fine, except for an very infrequent pop out the exhaust pipe.
> The
> > leakdown showed it was only holding 40% as compared to 80-85 for the
other
> > cylinders. When we tore the heads off, there was an exhaust valve with a
> > small crack from the stem out to the valve seat. I would bet that
> eventually
> > this valve would have broke and caused some serious damage. It was on a
> > Dodge 440 that got driven pretty hard.
> >
> > After looking at the numbers Bill got, and thinking about it a bit, he
> > "might" have a problem with one of the rings on that piston. I wouldn't
> > diagnose it as this until all the of other possibilities are checked. I
> > didn't want to scare him by posting this, and I think you were also
right
> in
> > saying that he should check the injector for that cylinder before he
tears
> > into the engine. Without any of us actually seeing his plug coloring, it
> is
> > hard to diagnose the problem. It may not be oil on the plug, or the oil
> may
> > be getting there because the extra gas is washing the cylinder down
which
> > will not let the oil control ring work like it should. I hope for his
sake
> > it is something like a bad injector, and because he bought his EFI kit
> used,
> > there is a good possibility of that.
> >
> > Chris
> >
> >
> > "Mike Romain" <romainm@sympatico.ca> wrote in message
> > news:402BBEB4.D3763E0D@sympatico.ca...
> > > Ok, I am curious...
> > >
> > > Do you have any idea just what those numbers represent or mean? I
> > > really don't.
> > >
> > > I am taking a wild assed guess and am thinking those represent the
shape
> > > of the valve seats. You did say you had some play in the valve stems
on
> > > #2 right? This will make a strange oval wear pattern on the valve
> > > seating area.
> > >
> > > I mean the compression is way up there like a new engine, so things
like
> > > rings and gaskets are fine. The book says a new 258 should have
140-150
> > > psi compression, but most important is even compression.
> > >
> > > Your compression is 'perfect'.
> > >
> > > It must be the seats of the metal parts that the leak down test
> > > tests???
> > >
> > > I honestly have never seen or heard of in person anyone doing that
kind
> > > of test. I have only heard about it on the internet and thought it
was
> > > a way to test a racing engine after a fresh rebuild like they do every
> > > second race or so.
> > >
> > > Mike
> > > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > > 88 Cherokee 235 BFG AT's
> > >
> > > William Oliveri wrote:
> > > >
> > > > Offical Complete results of the Leak down test with the proper
fitting
> > is as
> > > > follows:
> > > >
> > > > #1 -- 14.4%
> > > > #2 -- 24.5%
> > > > #3 -- 17.7%
> > > > #4 -- 11.1%
> > > > #5 -- 10.0%
> > > > #6 -- 13.3%
> > > >
> > > > Just for the record.
> >
> >
>
>

 

Correction. That is, I AM mentally ready for the worse but hoping for the
best.


"William Oliveri" <wuji@bigvalley.net> wrote in message
news:c0gn4a$174lnq$1@ID-193866.news.uni-berlin.de...
> Chris,
>
> Thank you for your reply. You won't scare me as I am not mentally
ready
> for the worse but hoping for the best.
>
> Thanks,
>
>
> "c" <c@me.org> wrote in message
> news:GCQWb.5218$_66.4336@twister.rdc-kc.rr.com...
> > Mike,
> >
> > It is most common for racers to use leakdown to test the condition of
> their
> > engine, but there is much more you can diagnose with it. An engine can
> show
> > relatively good compression numbers and still have a problem, but not
> > necessarily all the time. For instance, a head gasket that has started
to
> > seep (and will fail eventually) doesn't always get detected with a
> > compression test due to the short time the cylinder sees pressure while
> > cranking the engine. A leakdown test will find that seeping gasket if
the
> > air is left on long enough. I have also detected a bad exhaust valve
with
> a
> > leakdown that wasn't detected with a compression test. This particular
> > engine ran fine, except for an very infrequent pop out the exhaust pipe.
> The
> > leakdown showed it was only holding 40% as compared to 80-85 for the
other
> > cylinders. When we tore the heads off, there was an exhaust valve with a
> > small crack from the stem out to the valve seat. I would bet that
> eventually
> > this valve would have broke and caused some serious damage. It was on a
> > Dodge 440 that got driven pretty hard.
> >
> > After looking at the numbers Bill got, and thinking about it a bit, he
> > "might" have a problem with one of the rings on that piston. I wouldn't
> > diagnose it as this until all the of other possibilities are checked. I
> > didn't want to scare him by posting this, and I think you were also
right
> in
> > saying that he should check the injector for that cylinder before he
tears
> > into the engine. Without any of us actually seeing his plug coloring, it
> is
> > hard to diagnose the problem. It may not be oil on the plug, or the oil
> may
> > be getting there because the extra gas is washing the cylinder down
which
> > will not let the oil control ring work like it should. I hope for his
sake
> > it is something like a bad injector, and because he bought his EFI kit
> used,
> > there is a good possibility of that.
> >
> > Chris
> >
> >
> > "Mike Romain" <romainm@sympatico.ca> wrote in message
> > news:402BBEB4.D3763E0D@sympatico.ca...
> > > Ok, I am curious...
> > >
> > > Do you have any idea just what those numbers represent or mean? I
> > > really don't.
> > >
> > > I am taking a wild assed guess and am thinking those represent the
shape
> > > of the valve seats. You did say you had some play in the valve stems
on
> > > #2 right? This will make a strange oval wear pattern on the valve
> > > seating area.
> > >
> > > I mean the compression is way up there like a new engine, so things
like
> > > rings and gaskets are fine. The book says a new 258 should have
140-150
> > > psi compression, but most important is even compression.
> > >
> > > Your compression is 'perfect'.
> > >
> > > It must be the seats of the metal parts that the leak down test
> > > tests???
> > >
> > > I honestly have never seen or heard of in person anyone doing that
kind
> > > of test. I have only heard about it on the internet and thought it
was
> > > a way to test a racing engine after a fresh rebuild like they do every
> > > second race or so.
> > >
> > > Mike
> > > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > > 88 Cherokee 235 BFG AT's
> > >
> > > William Oliveri wrote:
> > > >
> > > > Offical Complete results of the Leak down test with the proper
fitting
> > is as
> > > > follows:
> > > >
> > > > #1 -- 14.4%
> > > > #2 -- 24.5%
> > > > #3 -- 17.7%
> > > > #4 -- 11.1%
> > > > #5 -- 10.0%
> > > > #6 -- 13.3%
> > > >
> > > > Just for the record.
> >
> >
>
>