many fuels are tinted, all over the world., (by law, or by oil companies, conveniences )
This car, has (had) red fuel. and you'd need to know that, anytime you see the signs of RED in places not wanted.
1: the engine oil.
2: spark plugs.
if the engine misfires with red fuel , the plug will turn red, how could not not?
your oil is not red, so that check passes.
so that leaves gross misfiring of this cylinder, or
oil fouling caused misfiring and the red fuel , making it turn red. (it will turn red misfiring, there is no stopping that , short of getting non red fuel.)
but i cant feel or smell your spark plug, ahh that is oil there, and must not be there.. so its oil fouling..... end of story. (means fix the root cause of oil INGRESS)
there are only 3 sources of oil here. (4 if cracks found in head....)
1: normal valve guides leaking. (intake is prime suspect on all engines, do to VACUUM there.)
2: cVcc guides leaking (in both cases it can be guides bad or cracks or in this case, the bad base seal, in the CVCC base or the whole thing bad)<<, only inspections work....
3: oil control ring, stuck in land, cracked, bad, or razor thin for 300k miles + end of life.
there is no "strongly deduce..." here. not with hands in pocket, (only inspections work and miking parts)
unless the crankcase if full (1/2) of red fuel. mixed with oil. (its not)
strongly deduce?
there is no such thing. all we know is there is oil in the combustion. nothing else ! and sure gross misfire and oily plug..
what causes the head to leak oil. (if its the head at all) is a matter of head off inspections. and pressure testing.
measuring all guide play by the book.
measure stem to guide clearance is just one step. (missing seals or damaged seals)
damage to the CVCC assembly in any way or form. (as hinted by builder)
if the head passes all tests , the oil control ring is bad.
the CVCC chamber is part of the main chamber, so ether can have too much oil, not just the CVCC, there is no way to prove that.
well, a CVCC expert (in not) can tell you if you can defeat the CVCC rocker, will the engine still run (this cylinder) ok? and stop the oil flow there. (wild guessing here...)
there are 2 intake valves.
the CVCC is rich and the regular valve is lean. the CVCC chamber fires and this ignites the lean in the main side.
so if you kill the CVCC dead, my be it will stop leaking oil. and the main will still burn ok, (who knows?)
end wild idea.....
The CVCC has 4 more ways to leak oil, (or more if cracks found or seals bad) more parts to fail, it has....
one could machine up a set of CVCC dummy plugs, after removing them totally and rockers.
then run carb tad richer. (finding parts is not easy on this old engine.) CVCC free mode.... i wonder if any one has done this.
or buy a head that is free of this setup... (its for USA 1975 laws,,,, ) id bet they had engines sold without it.. .somewhere., in the world.
if i had this, id be in the market for good head, or begging on craigs list for the Part.
And on all forums , with this topic.
it's not bad spark, unless the cylinder is 100% dead, and the normal oiling ways works up to the spark plug.
a dead cylinder will get some oil up top if you like drive 100 miles on a dead cylinder, (for sure on high mileage engines, and weak oil control ring)
china parts are ok, its noname parts that are suspect.
as you may not know, BOSCH has a plant in CHINA and makes 100% ISO 9000 grade parts. (that grade passes laws to allow import into Europe. unlike USA junk , we import all things. junk to good here, so must be on the look out for pure junk , like what is sold on fleabay... NO NAME.
Bosch ok to great.... great mag wires too....
NKJ , super good. (nothing better, ,really)
"sometingwong" bad. (if you can't pronounced it , run)
my list of real names, junk
Hebei Jintaisen
changzhou wujin sunan
Oingdao habid
Changzho shine
Guanxian Sanhui
Anrui holding
Qingtan special
Shandong Quanxian Kngsn
Jinan Kelunte
Tiansui DRB trading co.
Luoang boying
Xiamen Oujia import
Shangyu Hongda
Jiashan Dingyi
Shengang Zhongye Guangyan
Dogguan Shuanglian
and 600 more....
so now no red fuel
amber.
and now the spark plug is just amber oil fouled.
what do we need to know now....
answer (who leaks ? oil....)
the PCV could be blocked , exploiting the bad valves guides. as crank case pressure rises to illegal states. the guide so leak more.... just on high mileage engines...
this CVCC design is just a lean burn scheme.
it allows weak fueling to ignite in the main.
its not for economy, it to pass smog with no cat converter on the car, making this car , a rare car, that time that burns leaded and unleaded fuel.. (a big sales point at the time)
but has more parts to break.
but where to buy them.... ive not a clue.
This car, has (had) red fuel. and you'd need to know that, anytime you see the signs of RED in places not wanted.
1: the engine oil.
2: spark plugs.
if the engine misfires with red fuel , the plug will turn red, how could not not?
your oil is not red, so that check passes.
so that leaves gross misfiring of this cylinder, or
oil fouling caused misfiring and the red fuel , making it turn red. (it will turn red misfiring, there is no stopping that , short of getting non red fuel.)
but i cant feel or smell your spark plug, ahh that is oil there, and must not be there.. so its oil fouling..... end of story. (means fix the root cause of oil INGRESS)
there are only 3 sources of oil here. (4 if cracks found in head....)
1: normal valve guides leaking. (intake is prime suspect on all engines, do to VACUUM there.)
2: cVcc guides leaking (in both cases it can be guides bad or cracks or in this case, the bad base seal, in the CVCC base or the whole thing bad)<<, only inspections work....
3: oil control ring, stuck in land, cracked, bad, or razor thin for 300k miles + end of life.
there is no "strongly deduce..." here. not with hands in pocket, (only inspections work and miking parts)
unless the crankcase if full (1/2) of red fuel. mixed with oil. (its not)
strongly deduce?
there is no such thing. all we know is there is oil in the combustion. nothing else ! and sure gross misfire and oily plug..
what causes the head to leak oil. (if its the head at all) is a matter of head off inspections. and pressure testing.
measuring all guide play by the book.
measure stem to guide clearance is just one step. (missing seals or damaged seals)
damage to the CVCC assembly in any way or form. (as hinted by builder)
if the head passes all tests , the oil control ring is bad.
the CVCC chamber is part of the main chamber, so ether can have too much oil, not just the CVCC, there is no way to prove that.
well, a CVCC expert (in not) can tell you if you can defeat the CVCC rocker, will the engine still run (this cylinder) ok? and stop the oil flow there. (wild guessing here...)
there are 2 intake valves.
the CVCC is rich and the regular valve is lean. the CVCC chamber fires and this ignites the lean in the main side.
so if you kill the CVCC dead, my be it will stop leaking oil. and the main will still burn ok, (who knows?)
end wild idea.....
The CVCC has 4 more ways to leak oil, (or more if cracks found or seals bad) more parts to fail, it has....
one could machine up a set of CVCC dummy plugs, after removing them totally and rockers.
then run carb tad richer. (finding parts is not easy on this old engine.) CVCC free mode.... i wonder if any one has done this.
or buy a head that is free of this setup... (its for USA 1975 laws,,,, ) id bet they had engines sold without it.. .somewhere., in the world.
if i had this, id be in the market for good head, or begging on craigs list for the Part.
And on all forums , with this topic.
it's not bad spark, unless the cylinder is 100% dead, and the normal oiling ways works up to the spark plug.
a dead cylinder will get some oil up top if you like drive 100 miles on a dead cylinder, (for sure on high mileage engines, and weak oil control ring)
china parts are ok, its noname parts that are suspect.
as you may not know, BOSCH has a plant in CHINA and makes 100% ISO 9000 grade parts. (that grade passes laws to allow import into Europe. unlike USA junk , we import all things. junk to good here, so must be on the look out for pure junk , like what is sold on fleabay... NO NAME.
Bosch ok to great.... great mag wires too....
NKJ , super good. (nothing better, ,really)
"sometingwong" bad. (if you can't pronounced it , run)
my list of real names, junk
Hebei Jintaisen
changzhou wujin sunan
Oingdao habid
Changzho shine
Guanxian Sanhui
Anrui holding
Qingtan special
Shandong Quanxian Kngsn
Jinan Kelunte
Tiansui DRB trading co.
Luoang boying
Xiamen Oujia import
Shangyu Hongda
Jiashan Dingyi
Shengang Zhongye Guangyan
Dogguan Shuanglian
and 600 more....
so now no red fuel
amber.
and now the spark plug is just amber oil fouled.
what do we need to know now....
answer (who leaks ? oil....)
the PCV could be blocked , exploiting the bad valves guides. as crank case pressure rises to illegal states. the guide so leak more.... just on high mileage engines...
this CVCC design is just a lean burn scheme.
it allows weak fueling to ignite in the main.
its not for economy, it to pass smog with no cat converter on the car, making this car , a rare car, that time that burns leaded and unleaded fuel.. (a big sales point at the time)
but has more parts to break.
but where to buy them.... ive not a clue.
http://www.fixkick.com