Removing the Catalyc Converter

[maxfax]

catalytic converters are bad news!!!   

Bingo..   I have yet to find an engine that uses MORE fuel and makes LESS power with the cat removed..  Even with all the advancements of late..   Engine design and management as well as maintenance is the key..   Hence why we have modern engines making more power with better economy while still using a wreched cat..  Take the cats off and much like the antiques out there, more power and better economy instead of wasted heat...

(Flame suite on) The old Honda CVCC engine had no need for a cat till the early 80's..  Even then it still met emission level requirements, but cat converters HAD to be installed anyway as per our friends at the government that know best....

Okay done with the off topic rant..

[R.O.R-2.0]

honda CVCCs had 2 combustion chambers too. the spark plug wasnt actually in the main combustion chamber.

and the carb had 3 barrels. 2 were for running the engine, and the 3rd supplied a very rich mixture to the pre-combustion chamber.

the main mix in the combustion chamber was mixed very lean because of the rich mix in the pre-chamber.

[maxfax]

And most impressively, they worked and worked well..  And like anything else that works, and works well it had to be "improved"

[catlin_cava]

15,000kms with no cat, car still works good(when it works)  See next post for problems

[R.O.R-2.0]

And most impressively, they worked and worked well..  And like anything else that works, and works well it had to be "improved"

honda actually used that design up untill the current D series engines came out.. even the very first D series engines (were actually still E series, not a true D series)  had the cool head with 2 combustion chambers.. basically when honda went away from carburators, they quit using that rich mix to the pre chamber, and lean to the main chamber.. and just went to EFI, and catalytic converters..

if you are good at tuning gas carbs, you can pass emissions with just really RETARDED timing and a lean idle mix..

345 international went from 1800 CO count, to 90 CO count.. (900 being the legal limit where i had the truck)