Smog Legal 13B Porting
05-06-03, 11:49 PM
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Smog Legal 13B Porting
I was at rotary resurrection.com and I read about an interesting port for the 6-port 13B.
Being that I am in California, where the CARB ***** reign unchecked... I really like the idea of getting a little extra power AND still passing smog.
My questions are...
Has anyone tried this? Can someone guestimate the HP gain? It is really smog legal?
Just wanted to let you GSL-SE/6port 13B transplant people know! (unless of course this is old news, in which case i'll go cry in a corner...)
Thanks for reading and replying.
The “6th Port Streetport”:
I have recently developed a special version of SP unique to the 6 port nonturbo engines (84-91 13B). This port allows for a nice top end power increase with absolutely NO decrease in low end pull, driveability, or even emissions testing. This is accomplished by only porting the 5th and 6th intake ports, and a very light exhaust port. The “lower” 4 intake ports, responsible for idle and low rpm driving remain untouched, and so do the normal driving characteristics of the engine. Only at/above 3800rpm, when the auxiliary ports open, does the porting take effect and move more air through. No emissions test that I am aware of, even the dyno/roll test, pushes the engine to the point where the auxiliary ports open, therefore this is a good way to “hide” your performance gains from the emissions test. For those who don’t care about this, I can/do still port all the ports of a 6 port engine. I highly recommend the pineapple racing 6th port sleeves to compliment any streetport on a nonturbo engine.
I have recently developed a special version of SP unique to the 6 port nonturbo engines (84-91 13B). This port allows for a nice top end power increase with absolutely NO decrease in low end pull, driveability, or even emissions testing. This is accomplished by only porting the 5th and 6th intake ports, and a very light exhaust port. The “lower” 4 intake ports, responsible for idle and low rpm driving remain untouched, and so do the normal driving characteristics of the engine. Only at/above 3800rpm, when the auxiliary ports open, does the porting take effect and move more air through. No emissions test that I am aware of, even the dyno/roll test, pushes the engine to the point where the auxiliary ports open, therefore this is a good way to “hide” your performance gains from the emissions test. For those who don’t care about this, I can/do still port all the ports of a 6 port engine. I highly recommend the pineapple racing 6th port sleeves to compliment any streetport on a nonturbo engine.
My questions are...
Has anyone tried this? Can someone guestimate the HP gain? It is really smog legal?
Just wanted to let you GSL-SE/6port 13B transplant people know! (unless of course this is old news, in which case i'll go cry in a corner...)
Thanks for reading and replying.
05-07-03, 01:19 AM
#2
SOME hp gain, mostly at high rpms when the 6 port kicks in. Can't port those plates much, not much meat to grind away. But it does have promise. I bet it would pass smog even in ca. They don't spin the motor high enough to activate the 6th ports, and if they did, just disable them!@
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