For those who are running a B20 VTEC or sleeved B series blocks with greater than 84mm bore...............
I am currently running a mildly built B18C1 block and P72 GSR head. My car is already California BAR'd for a 1.8L GSR motor.

I may possibly sleeve my B18C1 block to run 2.0 liters, and maybe a compression bump to around 11.0:1. I will keep my P72 GSR head, ITR cams, intake, exhaust, etc. Of course I will have some tuning done. Overall it will be a mild build, and am hoping to hit at least 200WHP.

Forget the visual rules for the time being. What I am looking for are honest numbers for those who have actually passed tailpipe tests with a B20 VTEC or sleeved B18C or B18C1 motors with 84mm or higher bore sizes. I can then compare with the state numbers for the 1995 OBD1 B18C1.

For those who respond, could I know what cams and compression you are running?

 

Considering that emissions test results are in PPM (parts per million), the larger displacement won't change things. More air and more fuel, but same AFR, same emissions reading.

What I would be worried about is the higher compression increasing NOx counts, and that your timing will no longer be able to run correctly within the factory specified range.

If the visual isn't an issue, a good cat and a good tune should allow the car to pass just fine.

 

I agree with most of what you say except your first statement.

If air fuel ratio remains constant and the same between a 1.8L and 2.0L, then the extra displacement of the 2.0L will suck more air and fuel to maintain that air fuel ratio, which means exhaust emissions would increase. The question is by how much???

That is why I am looking for actual measured values from anyone with a B series 2.0 liter whether B20 VTEC or sleeved B18C/B18C1.

 

Did you ever recieve any responses to this post? I've been wondering the same thing.

 

Incorrect, sort of.

The total amount of pollutants would increase, sure, but that isn't what is measured.

What is measured is how much pollutants there are per amount of air, hence a PPM reading. If you double the air and double the fuel (and burn it the exact same amount), the emission test will report the exact same reading.

Back in highschool (testing was a bit more lax then, less emphasis on the visual and no NOx reading from the sniffer) I added a "smog pump" to a friend's late 70s BMW 2002 to pass the smog check. The car didn't have a catalytic converter. Pumping air into the exhaust only did one thing, increase the amount of air relative to the pollutants, and allowed the car to pass the sniffer test.

Don't confuse what makes sense with what the state does. Your head will explode trying.