engine smoke

[FUR30S]

Just wanna know if any1 can help me out I am gettin a real big puff of black smoke from the exhaust when i really get up my car (91 dual carb civic) would it just be runnin rich? can the carby b adjusted to help or should i look into gettin a new cat any info would b great thanks

[ECU-MAN]

the carbyz have pistons in them that get seized in the barrels causing the engine to run rich. I usually put off the piston covers one at a time and clean out the piston and its bore with carby cleaner. make sure the piston can freely move in and out of its barrel and bore, replace the o ring if its thrashed, and thats pretty much it.

[FUR30S]

it might b a bit more serious than that how can i tell if its a cracked ring or somethin?? n if it is is the only way to fix it a complete engine overhaul ???? thanks 4 ur help

[Toby]

Black smoke = fuel so nothing really to wory about.

[ECU-MAN]

compression test will tell you a bit about your rings. like Toby said black smoke if excessive fuel being burnt ( rich ) not oil being burnt.

[FUR30S]

thanks evry1 for ya help but i was jus askin cos at 1st i was told it was black smoke but wen i looked at it yesty with someone else revvin the car it looked like it coulda hada bluish tinge to it not sure gonna get a compression test done anyway. If it is the rings m i up 4 a rebuild or r there ways around it??
cheers

[ECU-MAN]

there aresome dirty tricks you could do for a temporary fix but I wont go there, engine rebuild or exchange engine would be the way to go for a long term fix.

[Toby]

If your motor is stuffed it will be a perfect time to do a B16 conversion :wink: