c

One thing I don't think anyone mentioned. Did you have the throttle open
when you did the test? If not, the reading will be low.

Chris

"billy ray" <billy_ray@SPAMfuse.net> wrote in message
news:bf3f2$45294873$422afc51$312@FUSE.NET...
> That has the AMC 360 right?
>
> http://amccf.com/tech/v8_specs.html
>
>
>
> "Dave Milne" <jeep@_removethisbit_milne.info> wrote in message
> news:8c7Wg.31235$r61.2601@text.news.blueyonder.co. uk...
>> Any one got the specs for a compression check on a 360 v8 '91 ?
>>
>> I'm only getting 8 bar (~ 115 psi) pretty consistently across all
>> cylinders.
>> I would have expected about 140-160 psi and am a bit surprised it is so
>> consisently low. That was a dry test - didn't do a wet one.
>>
>> Dave Milne, Scotland '91 Wagoneer
>>
>>
>
>

c

One thing I don't think anyone mentioned. Did you have the throttle open
when you did the test? If not, the reading will be low.

Chris

"billy ray" <billy_ray@SPAMfuse.net> wrote in message
news:bf3f2$45294873$422afc51$312@FUSE.NET...
> That has the AMC 360 right?
>
> http://amccf.com/tech/v8_specs.html
>
>
>
> "Dave Milne" <jeep@_removethisbit_milne.info> wrote in message
> news:8c7Wg.31235$r61.2601@text.news.blueyonder.co. uk...
>> Any one got the specs for a compression check on a 360 v8 '91 ?
>>
>> I'm only getting 8 bar (~ 115 psi) pretty consistently across all
>> cylinders.
>> I would have expected about 140-160 psi and am a bit surprised it is so
>> consisently low. That was a dry test - didn't do a wet one.
>>
>> Dave Milne, Scotland '91 Wagoneer
>>
>>
>
>

billy ray

They make 'dip sticks' to test for combustion gasses in the coolant.


"Dave Milne" <jeep@_removethisbit_milne.info> wrote in message
news:Z7aWg.31347$r61.2165@text.news.blueyonder.co. uk...
> Hi Carl,
> Engine was warm. Lowest reading was about 7.75 bar on one cylinder
> only.
> Trouble is, I think something is pressurising the coolant and I can't work
> out what it is. Cylinder pressures are uniform, no steam coming out the
> exhaust, no mayo in the oil, no oil in the water. Everything points to not
> having a problem were it not for the fact water is coming out of the
> expansion tank ! Occams Razor says it is me replacing the inlet manifold 3
> weeks ago, but I've just redone the inlet manifold gasket yesterday (new
> Felpro gaskets both times with RTV around both sides of the gaskets around
> the water jackets and exhaust as per instructions), and that didn't solve
> the problem.
>
> "Slightly baffled" Dave
>
> "Carl" <carlsaiyed@hotmailREMOVE.com> wrote in message
> news:l6SdnSW8ottbu7TYnZ2dnUVZ_o-dnZ2d@comcast.com...
>> Dave,
>>
>> Was the engine warm or cold? I'll second the uniformity. So long as
> they
>> are all close to 8 bar, I wouldn't really worry about it. You can try
>> putting a few drops of oil in each cylinder and trying the test again. If
>> the numbers rise your rings are a worn.
>>
>> However, with 8bar and uniformity, I wouldn't worry.
>>
>> Carl
>>
>>
>> "Dave Milne" <jeep@_removethisbit_milne.info> wrote in message
>> news:Jp9Wg.31319$r61.20498@text.news.blueyonder.co .uk...
>> > Thanks Doug & Earle.
>> >
>> > Dave
>> >
>> > "DougW" <post.replies@invalid.address> wrote in message
>> > news:MC8Wg.32151$iA5.14083@dukeread11...
>> >> Dave Milne wrote:
>> >> > Any one got the specs for a compression check on a 360 v8 '91 ?
>> >>
>> >> Got me. 160 is "normal" for the I6, but it has a higher compression
>> >> rating than the V8.
>> >>
>> >> > I'm only getting 8 bar (~ 115 psi) pretty consistently across all
>> >> > cylinders. I would have expected about 140-160 psi and am a bit
>> >> > surprised it is so consisently low. That was a dry test - didn't do
>> >> > a
>> >> > wet one.
>> >>
>> >> Consistency (psi +- 10%) is what your looking for in a compression
> test.
>> >>
>> >> - Run the engine till it gets warm to the touch.
>> >> - I find it easier on the battery with all the plugs out.
>> >> - Hold the throttle all the way open or the engine won't breathe.
>> >> - Cranking time varies, but most go with 5-10. I usually do 5.
>> >>
>> >> FWIW, I do a compression test each time I change plugs. Except this
>> >> time, the hose on my compression tester sprang a leak. :( 160-165 is
>> >> what the I6 gets when warm.
>> >>
>> >> --
>> >> DougW
>> >>
>> >>
>> >
>> >
>>
>>
>
>

billy ray

They make 'dip sticks' to test for combustion gasses in the coolant.


"Dave Milne" <jeep@_removethisbit_milne.info> wrote in message
news:Z7aWg.31347$r61.2165@text.news.blueyonder.co. uk...
> Hi Carl,
> Engine was warm. Lowest reading was about 7.75 bar on one cylinder
> only.
> Trouble is, I think something is pressurising the coolant and I can't work
> out what it is. Cylinder pressures are uniform, no steam coming out the
> exhaust, no mayo in the oil, no oil in the water. Everything points to not
> having a problem were it not for the fact water is coming out of the
> expansion tank ! Occams Razor says it is me replacing the inlet manifold 3
> weeks ago, but I've just redone the inlet manifold gasket yesterday (new
> Felpro gaskets both times with RTV around both sides of the gaskets around
> the water jackets and exhaust as per instructions), and that didn't solve
> the problem.
>
> "Slightly baffled" Dave
>
> "Carl" <carlsaiyed@hotmailREMOVE.com> wrote in message
> news:l6SdnSW8ottbu7TYnZ2dnUVZ_o-dnZ2d@comcast.com...
>> Dave,
>>
>> Was the engine warm or cold? I'll second the uniformity. So long as
> they
>> are all close to 8 bar, I wouldn't really worry about it. You can try
>> putting a few drops of oil in each cylinder and trying the test again. If
>> the numbers rise your rings are a worn.
>>
>> However, with 8bar and uniformity, I wouldn't worry.
>>
>> Carl
>>
>>
>> "Dave Milne" <jeep@_removethisbit_milne.info> wrote in message
>> news:Jp9Wg.31319$r61.20498@text.news.blueyonder.co .uk...
>> > Thanks Doug & Earle.
>> >
>> > Dave
>> >
>> > "DougW" <post.replies@invalid.address> wrote in message
>> > news:MC8Wg.32151$iA5.14083@dukeread11...
>> >> Dave Milne wrote:
>> >> > Any one got the specs for a compression check on a 360 v8 '91 ?
>> >>
>> >> Got me. 160 is "normal" for the I6, but it has a higher compression
>> >> rating than the V8.
>> >>
>> >> > I'm only getting 8 bar (~ 115 psi) pretty consistently across all
>> >> > cylinders. I would have expected about 140-160 psi and am a bit
>> >> > surprised it is so consisently low. That was a dry test - didn't do
>> >> > a
>> >> > wet one.
>> >>
>> >> Consistency (psi +- 10%) is what your looking for in a compression
> test.
>> >>
>> >> - Run the engine till it gets warm to the touch.
>> >> - I find it easier on the battery with all the plugs out.
>> >> - Hold the throttle all the way open or the engine won't breathe.
>> >> - Cranking time varies, but most go with 5-10. I usually do 5.
>> >>
>> >> FWIW, I do a compression test each time I change plugs. Except this
>> >> time, the hose on my compression tester sprang a leak. :( 160-165 is
>> >> what the I6 gets when warm.
>> >>
>> >> --
>> >> DougW
>> >>
>> >>
>> >
>> >
>>
>>
>
>

billy ray

They make 'dip sticks' to test for combustion gasses in the coolant.


"Dave Milne" <jeep@_removethisbit_milne.info> wrote in message
news:Z7aWg.31347$r61.2165@text.news.blueyonder.co. uk...
> Hi Carl,
> Engine was warm. Lowest reading was about 7.75 bar on one cylinder
> only.
> Trouble is, I think something is pressurising the coolant and I can't work
> out what it is. Cylinder pressures are uniform, no steam coming out the
> exhaust, no mayo in the oil, no oil in the water. Everything points to not
> having a problem were it not for the fact water is coming out of the
> expansion tank ! Occams Razor says it is me replacing the inlet manifold 3
> weeks ago, but I've just redone the inlet manifold gasket yesterday (new
> Felpro gaskets both times with RTV around both sides of the gaskets around
> the water jackets and exhaust as per instructions), and that didn't solve
> the problem.
>
> "Slightly baffled" Dave
>
> "Carl" <carlsaiyed@hotmailREMOVE.com> wrote in message
> news:l6SdnSW8ottbu7TYnZ2dnUVZ_o-dnZ2d@comcast.com...
>> Dave,
>>
>> Was the engine warm or cold? I'll second the uniformity. So long as
> they
>> are all close to 8 bar, I wouldn't really worry about it. You can try
>> putting a few drops of oil in each cylinder and trying the test again. If
>> the numbers rise your rings are a worn.
>>
>> However, with 8bar and uniformity, I wouldn't worry.
>>
>> Carl
>>
>>
>> "Dave Milne" <jeep@_removethisbit_milne.info> wrote in message
>> news:Jp9Wg.31319$r61.20498@text.news.blueyonder.co .uk...
>> > Thanks Doug & Earle.
>> >
>> > Dave
>> >
>> > "DougW" <post.replies@invalid.address> wrote in message
>> > news:MC8Wg.32151$iA5.14083@dukeread11...
>> >> Dave Milne wrote:
>> >> > Any one got the specs for a compression check on a 360 v8 '91 ?
>> >>
>> >> Got me. 160 is "normal" for the I6, but it has a higher compression
>> >> rating than the V8.
>> >>
>> >> > I'm only getting 8 bar (~ 115 psi) pretty consistently across all
>> >> > cylinders. I would have expected about 140-160 psi and am a bit
>> >> > surprised it is so consisently low. That was a dry test - didn't do
>> >> > a
>> >> > wet one.
>> >>
>> >> Consistency (psi +- 10%) is what your looking for in a compression
> test.
>> >>
>> >> - Run the engine till it gets warm to the touch.
>> >> - I find it easier on the battery with all the plugs out.
>> >> - Hold the throttle all the way open or the engine won't breathe.
>> >> - Cranking time varies, but most go with 5-10. I usually do 5.
>> >>
>> >> FWIW, I do a compression test each time I change plugs. Except this
>> >> time, the hose on my compression tester sprang a leak. :( 160-165 is
>> >> what the I6 gets when warm.
>> >>
>> >> --
>> >> DougW
>> >>
>> >>
>> >
>> >
>>
>>
>
>

billy ray

They make 'dip sticks' to test for combustion gasses in the coolant.

Have you pressure tested the radiator?


"Dave Milne" <jeep@_removethisbit_milne.info> wrote in message
news:Z7aWg.31347$r61.2165@text.news.blueyonder.co. uk...
> Hi Carl,
> Engine was warm. Lowest reading was about 7.75 bar on one cylinder
> only.
> Trouble is, I think something is pressurising the coolant and I can't work
> out what it is. Cylinder pressures are uniform, no steam coming out the
> exhaust, no mayo in the oil, no oil in the water. Everything points to not
> having a problem were it not for the fact water is coming out of the
> expansion tank ! Occams Razor says it is me replacing the inlet manifold 3
> weeks ago, but I've just redone the inlet manifold gasket yesterday (new
> Felpro gaskets both times with RTV around both sides of the gaskets around
> the water jackets and exhaust as per instructions), and that didn't solve
> the problem.
>
> "Slightly baffled" Dave
>
> "Carl" <carlsaiyed@hotmailREMOVE.com> wrote in message
> news:l6SdnSW8ottbu7TYnZ2dnUVZ_o-dnZ2d@comcast.com...
>> Dave,
>>
>> Was the engine warm or cold? I'll second the uniformity. So long as
> they
>> are all close to 8 bar, I wouldn't really worry about it. You can try
>> putting a few drops of oil in each cylinder and trying the test again. If
>> the numbers rise your rings are a worn.
>>
>> However, with 8bar and uniformity, I wouldn't worry.
>>
>> Carl
>>
>>
>> "Dave Milne" <jeep@_removethisbit_milne.info> wrote in message
>> news:Jp9Wg.31319$r61.20498@text.news.blueyonder.co .uk...
>> > Thanks Doug & Earle.
>> >
>> > Dave
>> >
>> > "DougW" <post.replies@invalid.address> wrote in message
>> > news:MC8Wg.32151$iA5.14083@dukeread11...
>> >> Dave Milne wrote:
>> >> > Any one got the specs for a compression check on a 360 v8 '91 ?
>> >>
>> >> Got me. 160 is "normal" for the I6, but it has a higher compression
>> >> rating than the V8.
>> >>
>> >> > I'm only getting 8 bar (~ 115 psi) pretty consistently across all
>> >> > cylinders. I would have expected about 140-160 psi and am a bit
>> >> > surprised it is so consisently low. That was a dry test - didn't do
>> >> > a
>> >> > wet one.
>> >>
>> >> Consistency (psi +- 10%) is what your looking for in a compression
> test.
>> >>
>> >> - Run the engine till it gets warm to the touch.
>> >> - I find it easier on the battery with all the plugs out.
>> >> - Hold the throttle all the way open or the engine won't breathe.
>> >> - Cranking time varies, but most go with 5-10. I usually do 5.
>> >>
>> >> FWIW, I do a compression test each time I change plugs. Except this
>> >> time, the hose on my compression tester sprang a leak. :( 160-165 is
>> >> what the I6 gets when warm.
>> >>
>> >> --
>> >> DougW
>> >>
>> >>
>> >
>> >
>>
>>
>
>

billy ray

They make 'dip sticks' to test for combustion gasses in the coolant.

Have you pressure tested the radiator?


"Dave Milne" <jeep@_removethisbit_milne.info> wrote in message
news:Z7aWg.31347$r61.2165@text.news.blueyonder.co. uk...
> Hi Carl,
> Engine was warm. Lowest reading was about 7.75 bar on one cylinder
> only.
> Trouble is, I think something is pressurising the coolant and I can't work
> out what it is. Cylinder pressures are uniform, no steam coming out the
> exhaust, no mayo in the oil, no oil in the water. Everything points to not
> having a problem were it not for the fact water is coming out of the
> expansion tank ! Occams Razor says it is me replacing the inlet manifold 3
> weeks ago, but I've just redone the inlet manifold gasket yesterday (new
> Felpro gaskets both times with RTV around both sides of the gaskets around
> the water jackets and exhaust as per instructions), and that didn't solve
> the problem.
>
> "Slightly baffled" Dave
>
> "Carl" <carlsaiyed@hotmailREMOVE.com> wrote in message
> news:l6SdnSW8ottbu7TYnZ2dnUVZ_o-dnZ2d@comcast.com...
>> Dave,
>>
>> Was the engine warm or cold? I'll second the uniformity. So long as
> they
>> are all close to 8 bar, I wouldn't really worry about it. You can try
>> putting a few drops of oil in each cylinder and trying the test again. If
>> the numbers rise your rings are a worn.
>>
>> However, with 8bar and uniformity, I wouldn't worry.
>>
>> Carl
>>
>>
>> "Dave Milne" <jeep@_removethisbit_milne.info> wrote in message
>> news:Jp9Wg.31319$r61.20498@text.news.blueyonder.co .uk...
>> > Thanks Doug & Earle.
>> >
>> > Dave
>> >
>> > "DougW" <post.replies@invalid.address> wrote in message
>> > news:MC8Wg.32151$iA5.14083@dukeread11...
>> >> Dave Milne wrote:
>> >> > Any one got the specs for a compression check on a 360 v8 '91 ?
>> >>
>> >> Got me. 160 is "normal" for the I6, but it has a higher compression
>> >> rating than the V8.
>> >>
>> >> > I'm only getting 8 bar (~ 115 psi) pretty consistently across all
>> >> > cylinders. I would have expected about 140-160 psi and am a bit
>> >> > surprised it is so consisently low. That was a dry test - didn't do
>> >> > a
>> >> > wet one.
>> >>
>> >> Consistency (psi +- 10%) is what your looking for in a compression
> test.
>> >>
>> >> - Run the engine till it gets warm to the touch.
>> >> - I find it easier on the battery with all the plugs out.
>> >> - Hold the throttle all the way open or the engine won't breathe.
>> >> - Cranking time varies, but most go with 5-10. I usually do 5.
>> >>
>> >> FWIW, I do a compression test each time I change plugs. Except this
>> >> time, the hose on my compression tester sprang a leak. :( 160-165 is
>> >> what the I6 gets when warm.
>> >>
>> >> --
>> >> DougW
>> >>
>> >>
>> >
>> >
>>
>>
>
>

billy ray

They make 'dip sticks' to test for combustion gasses in the coolant.

Have you pressure tested the radiator?


"Dave Milne" <jeep@_removethisbit_milne.info> wrote in message
news:Z7aWg.31347$r61.2165@text.news.blueyonder.co. uk...
> Hi Carl,
> Engine was warm. Lowest reading was about 7.75 bar on one cylinder
> only.
> Trouble is, I think something is pressurising the coolant and I can't work
> out what it is. Cylinder pressures are uniform, no steam coming out the
> exhaust, no mayo in the oil, no oil in the water. Everything points to not
> having a problem were it not for the fact water is coming out of the
> expansion tank ! Occams Razor says it is me replacing the inlet manifold 3
> weeks ago, but I've just redone the inlet manifold gasket yesterday (new
> Felpro gaskets both times with RTV around both sides of the gaskets around
> the water jackets and exhaust as per instructions), and that didn't solve
> the problem.
>
> "Slightly baffled" Dave
>
> "Carl" <carlsaiyed@hotmailREMOVE.com> wrote in message
> news:l6SdnSW8ottbu7TYnZ2dnUVZ_o-dnZ2d@comcast.com...
>> Dave,
>>
>> Was the engine warm or cold? I'll second the uniformity. So long as
> they
>> are all close to 8 bar, I wouldn't really worry about it. You can try
>> putting a few drops of oil in each cylinder and trying the test again. If
>> the numbers rise your rings are a worn.
>>
>> However, with 8bar and uniformity, I wouldn't worry.
>>
>> Carl
>>
>>
>> "Dave Milne" <jeep@_removethisbit_milne.info> wrote in message
>> news:Jp9Wg.31319$r61.20498@text.news.blueyonder.co .uk...
>> > Thanks Doug & Earle.
>> >
>> > Dave
>> >
>> > "DougW" <post.replies@invalid.address> wrote in message
>> > news:MC8Wg.32151$iA5.14083@dukeread11...
>> >> Dave Milne wrote:
>> >> > Any one got the specs for a compression check on a 360 v8 '91 ?
>> >>
>> >> Got me. 160 is "normal" for the I6, but it has a higher compression
>> >> rating than the V8.
>> >>
>> >> > I'm only getting 8 bar (~ 115 psi) pretty consistently across all
>> >> > cylinders. I would have expected about 140-160 psi and am a bit
>> >> > surprised it is so consisently low. That was a dry test - didn't do
>> >> > a
>> >> > wet one.
>> >>
>> >> Consistency (psi +- 10%) is what your looking for in a compression
> test.
>> >>
>> >> - Run the engine till it gets warm to the touch.
>> >> - I find it easier on the battery with all the plugs out.
>> >> - Hold the throttle all the way open or the engine won't breathe.
>> >> - Cranking time varies, but most go with 5-10. I usually do 5.
>> >>
>> >> FWIW, I do a compression test each time I change plugs. Except this
>> >> time, the hose on my compression tester sprang a leak. :( 160-165 is
>> >> what the I6 gets when warm.
>> >>
>> >> --
>> >> DougW
>> >>
>> >>
>> >
>> >
>>
>>
>
>

Dave Milne

Ah, no I didn't. It's dark now, so I can't retry it unfortunately.

Dave

"c" <c@me.org> wrote in message
news:tUbWg.1392$IO2.1010@tornado.rdc-kc.rr.com...
> One thing I don't think anyone mentioned. Did you have the throttle open
> when you did the test? If not, the reading will be low.
>
> Chris
>
> "billy ray" <billy_ray@SPAMfuse.net> wrote in message
> news:bf3f2$45294873$422afc51$312@FUSE.NET...
> > That has the AMC 360 right?
> >
> > http://amccf.com/tech/v8_specs.html
> >
> >
> >
> > "Dave Milne" <jeep@_removethisbit_milne.info> wrote in message
> > news:8c7Wg.31235$r61.2601@text.news.blueyonder.co. uk...
> >> Any one got the specs for a compression check on a 360 v8 '91 ?
> >>
> >> I'm only getting 8 bar (~ 115 psi) pretty consistently across all
> >> cylinders.
> >> I would have expected about 140-160 psi and am a bit surprised it is so
> >> consisently low. That was a dry test - didn't do a wet one.
> >>
> >> Dave Milne, Scotland '91 Wagoneer
> >>
> >>
> >
> >
>
>

Dave Milne

Ah, no I didn't. It's dark now, so I can't retry it unfortunately.

Dave

"c" <c@me.org> wrote in message
news:tUbWg.1392$IO2.1010@tornado.rdc-kc.rr.com...
> One thing I don't think anyone mentioned. Did you have the throttle open
> when you did the test? If not, the reading will be low.
>
> Chris
>
> "billy ray" <billy_ray@SPAMfuse.net> wrote in message
> news:bf3f2$45294873$422afc51$312@FUSE.NET...
> > That has the AMC 360 right?
> >
> > http://amccf.com/tech/v8_specs.html
> >
> >
> >
> > "Dave Milne" <jeep@_removethisbit_milne.info> wrote in message
> > news:8c7Wg.31235$r61.2601@text.news.blueyonder.co. uk...
> >> Any one got the specs for a compression check on a 360 v8 '91 ?
> >>
> >> I'm only getting 8 bar (~ 115 psi) pretty consistently across all
> >> cylinders.
> >> I would have expected about 140-160 psi and am a bit surprised it is so
> >> consisently low. That was a dry test - didn't do a wet one.
> >>
> >> Dave Milne, Scotland '91 Wagoneer
> >>
> >>
> >
> >
>
>