hey grumpyvette? my engines got less than 1200 miles on it so I know the rings can,t be warn out, but my engine just started running rather badly and smoking, any ideas? why the engine just started smoking?
its not a totally definitive test , but it will give you a good bit more info
have a friend follow you in his car ,someplace safe , to test drive your car like a long stretch of back rural road,, put the car in gear and run it up during hard acceleration at full throttle to lets say 5000rpm, then suddenly let the throttle snap closed and let engine compression slow the car, heavier smoke during hard acceleration when cylinder pressures high and intake vacuum is low generally indicates worn rings or piston damage, heavier smoke during deceleration as you let the engine drag the cars speed down, when the cylinder pressures low and intake plenum vacuum is high generally indicates bad valve seals or worn valve guides, be aware that a leaking intake gasket can suck oil into the ports from the lifter gallery also. obviously a LEAK DOWN test in conjunction gives you a better picture as to the cause of the oils source
http://forum.grumpysperformance.com/viewtopic.php?f=52&t=4283&p=15765&hilit=worn+valve+seals#p15765
http://forum.grumpysperformance.com/viewtopic.php?f=55&t=4891&p=24722&hilit=valve+guides#p24722
http://forum.grumpysperformance.com/viewtopic.php?f=50&t=41&p=49&hilit=leak+down#p49
viewtopic.php?f=53&t=247
viewtopic.php?f=53&t=3897
viewtopic.php?f=53&t=5454
viewtopic.php?f=53&t=4651
detonation damage is commonly responsible ,pull the plugs and look for indications of problems and then Id suggest a leak down test and a tear down ,inspection if the results of the leak-down test are not good
it only takes a few seconds of significant detonation to destroy piston lands or lock rings in their grooves
the transfer of micro bits of molten aluminum are a strong indicator of detonation
the pitted sharp edges and general over heat and appearance indicates detonation also
its not a totally definitive test , but it will give you a good bit more info
have a friend follow you in his car ,someplace safe , to test drive your car like a long stretch of back rural road,, put the car in gear and run it up during hard acceleration at full throttle to lets say 5000rpm, then suddenly let the throttle snap closed and let engine compression slow the car, heavier smoke during hard acceleration when cylinder pressures high and intake vacuum is low generally indicates worn rings or piston damage, heavier smoke during deceleration as you let the engine drag the cars speed down, when the cylinder pressures low and intake plenum vacuum is high generally indicates bad valve seals or worn valve guides, be aware that a leaking intake gasket can suck oil into the ports from the lifter gallery also. obviously a LEAK DOWN test in conjunction gives you a better picture as to the cause of the oils source
http://forum.grumpysperformance.com/viewtopic.php?f=52&t=4283&p=15765&hilit=worn+valve+seals#p15765
http://forum.grumpysperformance.com/viewtopic.php?f=55&t=4891&p=24722&hilit=valve+guides#p24722
http://forum.grumpysperformance.com/viewtopic.php?f=50&t=41&p=49&hilit=leak+down#p49
viewtopic.php?f=53&t=247
viewtopic.php?f=53&t=3897
viewtopic.php?f=53&t=5454
viewtopic.php?f=53&t=4651
detonation damage is commonly responsible ,pull the plugs and look for indications of problems and then Id suggest a leak down test and a tear down ,inspection if the results of the leak-down test are not good
it only takes a few seconds of significant detonation to destroy piston lands or lock rings in their grooves
the transfer of micro bits of molten aluminum are a strong indicator of detonation
the pitted sharp edges and general over heat and appearance indicates detonation also