NJ3ndri
08-21-2012, 09:26 AM
ok so i rebuild a ka . with new rings and new gaskets. starting from bottom up. what i replaced.
Rod Bearings
Piston Rings
Cometic headgasket
Laped the valves
ported intake and exhaust to match gasket.
That being said i didnt do much.
Now i rechecked my timing over multiple times and everything is right.
crank at top dead center cams facing out valves closed and distributor set at #1 mark.
I do have spark and I do have fuel. engine coolant temp sensor is fine and reading from pcm.
NOW THE ONLY OBVIOUS ISSUE I SEE.
my compression is around 90 all across (should be 130 - 150 i would assume after a rebuild) but should still somewhat start with 90?!?!!
now i could think of 2 reasons why that might be.
1. because valves were lapped now there may be a gap between the valve and the seat. i didnt shave the valve stem to compensate for laping because i dont think i took off enough to need to do that.
2. I may have put the rings upside down which i highly doubt because i checked before installing if they had a certain side up. (i may be wrong) i bought the rings at frsport.com not the oem but the other brand they have.
I cant think of anything else but since im averaging around 90 on all four it seems like something common on all 4 obviously. almost like cam might be off a tooth but like i said. timing is good . maybe my rings could be upside down.
anyone have any thoughts?? would appreciate it thanks
Rod Bearings
Piston Rings
Cometic headgasket
Laped the valves
ported intake and exhaust to match gasket.
That being said i didnt do much.
Now i rechecked my timing over multiple times and everything is right.
crank at top dead center cams facing out valves closed and distributor set at #1 mark.
I do have spark and I do have fuel. engine coolant temp sensor is fine and reading from pcm.
NOW THE ONLY OBVIOUS ISSUE I SEE.
my compression is around 90 all across (should be 130 - 150 i would assume after a rebuild) but should still somewhat start with 90?!?!!
now i could think of 2 reasons why that might be.
1. because valves were lapped now there may be a gap between the valve and the seat. i didnt shave the valve stem to compensate for laping because i dont think i took off enough to need to do that.
2. I may have put the rings upside down which i highly doubt because i checked before installing if they had a certain side up. (i may be wrong) i bought the rings at frsport.com not the oem but the other brand they have.
I cant think of anything else but since im averaging around 90 on all four it seems like something common on all 4 obviously. almost like cam might be off a tooth but like i said. timing is good . maybe my rings could be upside down.
anyone have any thoughts?? would appreciate it thanks