02-18-2019, 09:55 AM
[quote='fixkick' pid='11172' dateline='1550444346']
how do you not know that is NOT ping you are hearing. (detonation)
i guess that noise happens hot, engine cold engine and any rpm? (please tell all)
if the head was both milled and engine decked too. the total combustion chamber volume may be radially too small. (HIGH CR)
in fact a pro shop CCs them before head is put back, after all he does not know how many times that head was milled,(shaved or what ever) 55cc rings bells but IDK, forgot spec. its in the book.
Some even (wrongly) shave warped head now needing huge cuts, and then CR is way to high. and detonation.
one easy proof is compression checks show it way too high.
185 is par, seen one at 220+ due to shaving, head, (2 head gaskets can fix that)
one way to prove PING too is force engine AFR rich, and it must stop pinging or retard spark ,like turbo guys do to end the blown up engine event, under boost and AFR goes lean.
AFR (air fuel ratio)
one way more way is pull the FPR vacuum hose and plug how with golf tee, now fuel pressure goes 6 psi higher, (fuel pressure is opposite of vacuum HG inches ) this makes injectors squirt more fuel. ping ends.
and you see if ping ends if it is ping.
THE EGR (anti ping tech) is tuned off at idle or not not moving 1996+ its off parked)
so EGR is no help pinging at idle. (ON THIS CAR ONLy moving EGR goes LIVE)
if the engine is cold it should never ping, but you never told all ways it does nor does not make noise. (or I forget and is easy at my age.. eheheheheh)
[/quote/]
The noise happens only when warmed up or near warmed up. I have an aft gauge and it’s not lean at all at idle, timing is correct. I have a lower compression ratio than stock because I’m going turbo but I have the waste gate open running no boost yet, just naturally aspirated. My compression ratio is 8.5:1 or somewhere close to that since I don’t know exact specs due to head and block decking. . My compression on all cylinders is 150psi because of the pistons. The egr is bypassed and not used at all. Noise never occurs when cold, only when warm. The noise sometimes is louder than other times but not by much. I will try messing with timing at idle to see if it quietens down some.
how do you not know that is NOT ping you are hearing. (detonation)
i guess that noise happens hot, engine cold engine and any rpm? (please tell all)
if the head was both milled and engine decked too. the total combustion chamber volume may be radially too small. (HIGH CR)
in fact a pro shop CCs them before head is put back, after all he does not know how many times that head was milled,(shaved or what ever) 55cc rings bells but IDK, forgot spec. its in the book.
Some even (wrongly) shave warped head now needing huge cuts, and then CR is way to high. and detonation.
one easy proof is compression checks show it way too high.
185 is par, seen one at 220+ due to shaving, head, (2 head gaskets can fix that)
one way to prove PING too is force engine AFR rich, and it must stop pinging or retard spark ,like turbo guys do to end the blown up engine event, under boost and AFR goes lean.
AFR (air fuel ratio)
one way more way is pull the FPR vacuum hose and plug how with golf tee, now fuel pressure goes 6 psi higher, (fuel pressure is opposite of vacuum HG inches ) this makes injectors squirt more fuel. ping ends.
and you see if ping ends if it is ping.
THE EGR (anti ping tech) is tuned off at idle or not not moving 1996+ its off parked)
so EGR is no help pinging at idle. (ON THIS CAR ONLy moving EGR goes LIVE)
if the engine is cold it should never ping, but you never told all ways it does nor does not make noise. (or I forget and is easy at my age.. eheheheheh)
[/quote/]
The noise happens only when warmed up or near warmed up. I have an aft gauge and it’s not lean at all at idle, timing is correct. I have a lower compression ratio than stock because I’m going turbo but I have the waste gate open running no boost yet, just naturally aspirated. My compression ratio is 8.5:1 or somewhere close to that since I don’t know exact specs due to head and block decking. . My compression on all cylinders is 150psi because of the pistons. The egr is bypassed and not used at all. Noise never occurs when cold, only when warm. The noise sometimes is louder than other times but not by much. I will try messing with timing at idle to see if it quietens down some.