Node

Alright, I just moved to cali and had a blown motor. I have a very good motor builder friend, he offered to port it and I am looking to have it keep the full emissions minus EGR to beat the california governators! I am keeping BAC, ACV, Airpump and Main Cat.

I am going to use an Rtek. 2.0 to be specific and plan to let the emissions just do its thing and tune accordingly.

Along with a H-trim hybrid and upgraded HKS stock mount intercooler

I am having the plates ground and buying new rotor housings and full OE Mazda rebuild kit, he won't build with anything les and no aftermarket pieces!

How can I port to make it pass emissions, I'm looking for broad powerband/torque for the mountains I live in, and autocross/track and just good daily driving with a wide powerband.



Also getting FD 90psi oil regulator and FD 3 window stat gear bearings or whatever.



Would love some of the guys input on this board, especailly Ito-san!



This isn't me daydreaming again, I have the parts available to get the motor started and most of the money. Will be done to my car soon. Help a brotha out!

Thanks,

Ben Martin

1Revvin7

Why don't you leave that up to your engine builder instead of the internet gurus....

j9fd3s

say what? my t2 passed with the following port. exhaust went down to match the sleeve, intake just the casting flash was removed.



stock ecu+fcon turned to zero, new acv (it actually worked!), new 3" main cat, rb turboback exhaust. no egr, and a k&n cone.

Node

I just wanted some general ideas on what has passed emissions. I don't think my engine builder worries about emissions too much, just powerband and power and efficiency.



Thats what I'm after j9, I have been considering not touching the timing at all and maybe just have the stock port really cleaned up. BTW, you ever get that list to email j9?

Kathy Atkins

Just cleaning up the ports wakes up the power with out hurting the emissions as long as the other emissions stuff is in working order. We've has stage 2 pass with flying colors........



When you get the cast irons ground make sure they are lapped so that you have the finish you need.



PM the jusge and Im sure he will help ya, hes a cool dude, with a gift at rotaries

Node

Thanks, that would help my issue with me thinking a hybrid would be too small. Cause backpressure on a ported motor.

I dunno, never had my motor built before.

Judge Ito

the whole deal is to eliminate "overlap" as much as possible. Node if your worried about emissions, I would go ahead and have the intake ported up towards the closing edge of the port. I would leave the intake opening part of the port alone(intake opening, is the side wall.. that has the radius). Then I would port the exhaust down to match the exhaust diffuser like Mike said. This way your not increasing overlap. but your getting the advantage of a ported engine including better flow.

dguy

I think that a large issue with California emissions is the ACV. We've built many customer cars with fairly aggressive ports and have found that using a new ACV rather than an old and cleaned ACV shoots them right through.

j9fd3s

some of the cars, like the 12a's the smog testing is done over 2500, and this AFTER the acv dumps the air back to the air cleaner, so they fail. we (most of the rx mechanics left) either mechanically shim the valve so its "on" all the time, or you can actually unplug the solenoid too

dguy

True, we have our in house 'smog passing ACV' as well. I was just mentioning that if you're trying to legitimately pass a 13bt a clean ACV with a completely supple and intact diaphragm makes a world of difference.