02-18-2019, 08:59 AM
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)
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)
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