You should do a good valve adjustment for the hell of it just to rule out
valve clatter. May be your timing belt is off one tooth? Take off your
accessory belts and check them for bad bearings or noise. It could be a
bent rod or valve even. It could be alot of things.
"JR Lomas" <jrl@engineer.nu> wrote in message
news:m56dnaYJL5_nPH2iRVn-iw@comcast.com...
> I have a JDM ZC 1.6L engine I just put in my 1994 Honda Civic LX.
> Everything is working all right. No loss of power, performance or
anything.
> However, I can hear this dull knocking noise when the engine is running.
I
> am pretty sure it is not the timing or the gas I am running (timing set to
> 16 DB TDC and 92 octane). I'd say it sounds like piston slap but the
again
> I never heard what piston slap sounds like. By the way, the sound is
always
> there, whether the car is cold or at normal temperature. I did a
> compression test and here are the results (from cylinder 1 to 4):
> 150psi, 184psi,182psi,184psi
> I did some more testing on cylinder 1 and the pressure build up quickily
> during the first two strokes but at the third stroke the pressure maxed
out
> and further strokes only increased the pressure buildup marginally. After
> this I added three squirts of oils through the spark plug hole and
retested,
> and the pressure came out to be the same. No increase. I thought I might
> have been hearing piston slap at cylinder 1, but I guess this means it is
> probably not the piston rings? Could the noise come from one the
> accessories? Could it be the valve or the camshaft?
> Thanks in advance for any help,
>
> - JR
>
>

 

You should do a good valve adjustment for the hell of it just to rule out
valve clatter. May be your timing belt is off one tooth? Take off your
accessory belts and check them for bad bearings or noise. It could be a
bent rod or valve even. It could be alot of things.
"JR Lomas" <jrl@engineer.nu> wrote in message
news:m56dnaYJL5_nPH2iRVn-iw@comcast.com...
> I have a JDM ZC 1.6L engine I just put in my 1994 Honda Civic LX.
> Everything is working all right. No loss of power, performance or
anything.
> However, I can hear this dull knocking noise when the engine is running.
I
> am pretty sure it is not the timing or the gas I am running (timing set to
> 16 DB TDC and 92 octane). I'd say it sounds like piston slap but the
again
> I never heard what piston slap sounds like. By the way, the sound is
always
> there, whether the car is cold or at normal temperature. I did a
> compression test and here are the results (from cylinder 1 to 4):
> 150psi, 184psi,182psi,184psi
> I did some more testing on cylinder 1 and the pressure build up quickily
> during the first two strokes but at the third stroke the pressure maxed
out
> and further strokes only increased the pressure buildup marginally. After
> this I added three squirts of oils through the spark plug hole and
retested,
> and the pressure came out to be the same. No increase. I thought I might
> have been hearing piston slap at cylinder 1, but I guess this means it is
> probably not the piston rings? Could the noise come from one the
> accessories? Could it be the valve or the camshaft?
> Thanks in advance for any help,
>
> - JR
>
>

 

Well you guys, here is the update. The engine that I just put in my car
DOES have piston slap. I did a compression test once again, and the dry
test for cylinder #1 was 140psi. The wet test showed 190 psi. I guess last
time a few drops of oil were not enough My worst fear is now confirmed.
Cylinder #1 has a ring problem. It is fortunate that the engine came with a
12 month, 12,000 mile warranty. However, I just wasted all that time taking
the old engine out and putting the new (broken) one in. Of all things that
could be wrong with an engine, this is the one problem that can't be fixed
without taking the engine out [sigh]. Anyway, the moral of the story is
"test your engine BEFORE you drop it in", I didn't and I certainly regret
it; nonetheless, I will not let this experience deter me from fixing my car
properly, the broken engine is coming out and a new one is going in. Well
hell, like my dad said, learning IS expensive.

- JR

"JR Lomas" <jrl@engineer.nu> wrote in message
news:m56dnaYJL5_nPH2iRVn-iw@comcast.com...
> I have a JDM ZC 1.6L engine I just put in my 1994 Honda Civic LX.
> Everything is working all right. No loss of power, performance or
anything.
> However, I can hear this dull knocking noise when the engine is running.
I
> am pretty sure it is not the timing or the gas I am running (timing set to
> 16 DB TDC and 92 octane). I'd say it sounds like piston slap but the
again
> I never heard what piston slap sounds like. By the way, the sound is
always
> there, whether the car is cold or at normal temperature. I did a
> compression test and here are the results (from cylinder 1 to 4):
> 150psi, 184psi,182psi,184psi
> I did some more testing on cylinder 1 and the pressure build up quickily
> during the first two strokes but at the third stroke the pressure maxed
out
> and further strokes only increased the pressure buildup marginally. After
> this I added three squirts of oils through the spark plug hole and
retested,
> and the pressure came out to be the same. No increase. I thought I might
> have been hearing piston slap at cylinder 1, but I guess this means it is
> probably not the piston rings? Could the noise come from one the
> accessories? Could it be the valve or the camshaft?
> Thanks in advance for any help,
>
> - JR
>
>

 

Well you guys, here is the update. The engine that I just put in my car
DOES have piston slap. I did a compression test once again, and the dry
test for cylinder #1 was 140psi. The wet test showed 190 psi. I guess last
time a few drops of oil were not enough My worst fear is now confirmed.
Cylinder #1 has a ring problem. It is fortunate that the engine came with a
12 month, 12,000 mile warranty. However, I just wasted all that time taking
the old engine out and putting the new (broken) one in. Of all things that
could be wrong with an engine, this is the one problem that can't be fixed
without taking the engine out [sigh]. Anyway, the moral of the story is
"test your engine BEFORE you drop it in", I didn't and I certainly regret
it; nonetheless, I will not let this experience deter me from fixing my car
properly, the broken engine is coming out and a new one is going in. Well
hell, like my dad said, learning IS expensive.

- JR

"JR Lomas" <jrl@engineer.nu> wrote in message
news:m56dnaYJL5_nPH2iRVn-iw@comcast.com...
> I have a JDM ZC 1.6L engine I just put in my 1994 Honda Civic LX.
> Everything is working all right. No loss of power, performance or
anything.
> However, I can hear this dull knocking noise when the engine is running.
I
> am pretty sure it is not the timing or the gas I am running (timing set to
> 16 DB TDC and 92 octane). I'd say it sounds like piston slap but the
again
> I never heard what piston slap sounds like. By the way, the sound is
always
> there, whether the car is cold or at normal temperature. I did a
> compression test and here are the results (from cylinder 1 to 4):
> 150psi, 184psi,182psi,184psi
> I did some more testing on cylinder 1 and the pressure build up quickily
> during the first two strokes but at the third stroke the pressure maxed
out
> and further strokes only increased the pressure buildup marginally. After
> this I added three squirts of oils through the spark plug hole and
retested,
> and the pressure came out to be the same. No increase. I thought I might
> have been hearing piston slap at cylinder 1, but I guess this means it is
> probably not the piston rings? Could the noise come from one the
> accessories? Could it be the valve or the camshaft?
> Thanks in advance for any help,
>
> - JR
>
>

 

Well you guys, here is the update. The engine that I just put in my car
DOES have piston slap. I did a compression test once again, and the dry
test for cylinder #1 was 140psi. The wet test showed 190 psi. I guess last
time a few drops of oil were not enough My worst fear is now confirmed.
Cylinder #1 has a ring problem. It is fortunate that the engine came with a
12 month, 12,000 mile warranty. However, I just wasted all that time taking
the old engine out and putting the new (broken) one in. Of all things that
could be wrong with an engine, this is the one problem that can't be fixed
without taking the engine out [sigh]. Anyway, the moral of the story is
"test your engine BEFORE you drop it in", I didn't and I certainly regret
it; nonetheless, I will not let this experience deter me from fixing my car
properly, the broken engine is coming out and a new one is going in. Well
hell, like my dad said, learning IS expensive.

- JR

"JR Lomas" <jrl@engineer.nu> wrote in message
news:m56dnaYJL5_nPH2iRVn-iw@comcast.com...
> I have a JDM ZC 1.6L engine I just put in my 1994 Honda Civic LX.
> Everything is working all right. No loss of power, performance or
anything.
> However, I can hear this dull knocking noise when the engine is running.
I
> am pretty sure it is not the timing or the gas I am running (timing set to
> 16 DB TDC and 92 octane). I'd say it sounds like piston slap but the
again
> I never heard what piston slap sounds like. By the way, the sound is
always
> there, whether the car is cold or at normal temperature. I did a
> compression test and here are the results (from cylinder 1 to 4):
> 150psi, 184psi,182psi,184psi
> I did some more testing on cylinder 1 and the pressure build up quickily
> during the first two strokes but at the third stroke the pressure maxed
out
> and further strokes only increased the pressure buildup marginally. After
> this I added three squirts of oils through the spark plug hole and
retested,
> and the pressure came out to be the same. No increase. I thought I might
> have been hearing piston slap at cylinder 1, but I guess this means it is
> probably not the piston rings? Could the noise come from one the
> accessories? Could it be the valve or the camshaft?
> Thanks in advance for any help,
>
> - JR
>
>

 

Well you guys, here is the update. The engine that I just put in my car
DOES have piston slap. I did a compression test once again, and the dry
test for cylinder #1 was 140psi. The wet test showed 190 psi. I guess last
time a few drops of oil were not enough My worst fear is now confirmed.
Cylinder #1 has a ring problem. It is fortunate that the engine came with a
12 month, 12,000 mile warranty. However, I just wasted all that time taking
the old engine out and putting the new (broken) one in. Of all things that
could be wrong with an engine, this is the one problem that can't be fixed
without taking the engine out [sigh]. Anyway, the moral of the story is
"test your engine BEFORE you drop it in", I didn't and I certainly regret
it; nonetheless, I will not let this experience deter me from fixing my car
properly, the broken engine is coming out and a new one is going in. Well
hell, like my dad said, learning IS expensive.

- JR

"JR Lomas" <jrl@engineer.nu> wrote in message
news:m56dnaYJL5_nPH2iRVn-iw@comcast.com...
> I have a JDM ZC 1.6L engine I just put in my 1994 Honda Civic LX.
> Everything is working all right. No loss of power, performance or
anything.
> However, I can hear this dull knocking noise when the engine is running.
I
> am pretty sure it is not the timing or the gas I am running (timing set to
> 16 DB TDC and 92 octane). I'd say it sounds like piston slap but the
again
> I never heard what piston slap sounds like. By the way, the sound is
always
> there, whether the car is cold or at normal temperature. I did a
> compression test and here are the results (from cylinder 1 to 4):
> 150psi, 184psi,182psi,184psi
> I did some more testing on cylinder 1 and the pressure build up quickily
> during the first two strokes but at the third stroke the pressure maxed
out
> and further strokes only increased the pressure buildup marginally. After
> this I added three squirts of oils through the spark plug hole and
retested,
> and the pressure came out to be the same. No increase. I thought I might
> have been hearing piston slap at cylinder 1, but I guess this means it is
> probably not the piston rings? Could the noise come from one the
> accessories? Could it be the valve or the camshaft?
> Thanks in advance for any help,
>
> - JR
>
>