what are the signs of blow by

[64 200 ranchero]

i always thought that white smoke in the exhaust was the only indication but on my 170 there is no smoke in the exhaust but alot coming from the crank vent port where the road draft tube go's and it burns about a quart every 2 weeks i want to recirculate the oil somehow to save myself trips to auto zone also i use quaker state Q 20w 50 high rpm what oils do you guys use

 

[fordconvert]

Smoke out the breather is a sign of blow by. Its basically exhaust gas getting past the piston rings and looking for a way out. On its way out it brings extra heat and contaminants which is part of where your oil is going. You dont see it as soon on newer cars because of the PCV system sucks it back into the system up to a point. I saw your other post where you said you got around 100psi on a compression test. Thats on the low side, your motor is just worn out. Time for a rebuild or find another engine. A good fresh engine is going to be over 150. 120 is getting down there but I have heard people say they still run good. You start getting in the 75 range and it wont run anymore. Its also one of those things that is likely to get worse fairly quickly.

 

[64 200 ranchero]

yeah ill prob rebuild it after im done with the turbo 200

 

[64 200 ranchero]

i wonder if keeping the engine cooler will help it last longer because it only smokes when its at opperating temp

 

[rbohm]

8) no, cooler operating temps will actually accelerate wear. however running a thicker oil, like a 20w50 or adding a can of stp should help.

 

[Bradbutlernc]

Smoke out the breather is a sign of blow by. Its basically exhaust gas getting past the piston rings and looking for a way out. On its way out it brings extra heat and contaminants which is part of where your oil is going. You dont see it as soon on newer cars because of the PCV system sucks it back into the system up to a point. I saw your other post where you said you got around 100psi on a compression test. Thats on the low side, your motor is just worn out. Time for a rebuild or find another engine. A good fresh engine is going to be over 150. 120 is getting down there but I have heard people say they still run good. You start getting in the 75 range and it wont run anymore. Its also one of those things that is likely to get worse fairly quickly.

I have to disagree...i have a 68 pontiac 400 that has 25psi each cylinder...blown head gaskets and everything else, and it still hauls ass. :mrgreen:

 

[64 200 ranchero]

yeah my grandpa of an engine runs very well it never misfires i am able to bark the tires while rolling and was able to do wicked burnouts before my clutch burned out still drives good but it smokes soooo much from the cvp :x

 

[Frankenstang]

I have to disagree...i have a 68 pontiac 400 that has 25psi each cylinder...blown head gaskets and everything else, and it still hauls ass. :mrgreen:

Nah...that's just a cheby product for ya...hard to tell diff between really good and worn out

 

[64 200 ranchero]

i wish i could put pics of my ranchero so you guys could see a real frankinstine car my motor looks like it has its own life support system but what i like about these ford motors is they will keep running no matter how old they are

 

[Explorer]

Time to break out the snake oil on this one. Restore, Lucas etc. will keep it going for a while.

 

[64 200 ranchero]

i used engine restore before it works ok, yeah i guess ill go back to that