13b 6port sleeves and other related questions
07-26-04, 11:37 PM
#1
The thing
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13b 6port sleeves and other related questions
I found a thread by DVCN that he removed the six port sleeves on his 13b 6pt what does this intail, wouldn't that be much like a street port with a WHOLE LOT less efort. Heres a question about porting as well, does your exhaust port have to match your intake? what im saying i guess is can you completly open up your exhaust port but only street port the intake? If so would this work, would the engine gain from this?
Another question I herd something about useing 12a parts to convert my 13b 6pt to 4 port. How hard is this and how well does it hold up? If it is a good/ easy thing to do than I will port out my spare 12a side housings and use them till I have money for a turbo motor.
one more question with rotory engines what is changed on the rotors to lower compresion? i know in a piston engine you change rings and heads.
Another question I herd something about useing 12a parts to convert my 13b 6pt to 4 port. How hard is this and how well does it hold up? If it is a good/ easy thing to do than I will port out my spare 12a side housings and use them till I have money for a turbo motor.
one more question with rotory engines what is changed on the rotors to lower compresion? i know in a piston engine you change rings and heads.
07-27-04, 12:36 AM
#2
Chad Carson
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6 port
Go to http://rotaryresurrection.com/
Here is his message:
Nonturbo 6 port engines, auxiliaries (5/6 ports) only:
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, though there isn't much performance gain for the 4 smaller ports, and there isn't much room to port into them anyway.
Here is his message:
Nonturbo 6 port engines, auxiliaries (5/6 ports) only:
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, though there isn't much performance gain for the 4 smaller ports, and there isn't much room to port into them anyway.
07-27-04, 12:39 AM
#3
Chad Carson
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Answer
"Another question I herd something about useing 12a parts to convert my 13b 6pt to 4 port"
As far as using 12a parts for this, NO but you can use 13B housings from 2nd gens.
Again here is a massage from him,
I've built 4 SE engines now, each time I've used mostly 2nd generation parts to build a hybrid engine of sorts. So long as we keep the 6 port configuration found in all 84-91 13b, you can use just about whatever parts you want. I'll spare you the technical details (though I can show you when you come in) but suffice to say that the 86+ parts are more plentiful (I have no SE rotorhousings on the shelf to replace the bad one in your engine anyway) and usually in better condition than the older parts. Plus, they start out with bigger intake and exhaust ports from the factory...add porting on top of that, and you have a good amount of increased airflow. What I'd be using would be 86-91 irons and rotorhousings, your original SE front cover and oilpan, and your stock rotating assembly.
Hope that helps......
As far as using 12a parts for this, NO but you can use 13B housings from 2nd gens.
Again here is a massage from him,
I've built 4 SE engines now, each time I've used mostly 2nd generation parts to build a hybrid engine of sorts. So long as we keep the 6 port configuration found in all 84-91 13b, you can use just about whatever parts you want. I'll spare you the technical details (though I can show you when you come in) but suffice to say that the 86+ parts are more plentiful (I have no SE rotorhousings on the shelf to replace the bad one in your engine anyway) and usually in better condition than the older parts. Plus, they start out with bigger intake and exhaust ports from the factory...add porting on top of that, and you have a good amount of increased airflow. What I'd be using would be 86-91 irons and rotorhousings, your original SE front cover and oilpan, and your stock rotating assembly.
Hope that helps......
07-29-04, 08:38 PM
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Removing the 5th & 6th ports aren't as good as a street port but do give a good power increase when running a carb.
Everything works together as a system. You will get best overall performance when the intake, exhaust, porting, ignition, gearing and suspension all work together. Going 'full race' on any one item may actually reduce performance (depending on how you define performance). Short answer: If you are going to go through the trouble of porting the exhaust, why wouldn't you do the intake? What some conisder a small streetport can get good mileage, make huge power and have excellent torque.
My current engine consists of 82(83?) 12A sidehousings, street ported using the Racing Beat templates. The rotating assembly is 84 or 85 GSL-SE, can't remember. The rotor housings are 74 or 75 13B. Short answer: Yes, you can convert an 84-85 13B into a 4 port by using 12A side housings. You can't mix 12A sidehousings and 86+ rotor housings due to the non-existant grooves for the water o-rings.
Everything works together as a system. You will get best overall performance when the intake, exhaust, porting, ignition, gearing and suspension all work together. Going 'full race' on any one item may actually reduce performance (depending on how you define performance). Short answer: If you are going to go through the trouble of porting the exhaust, why wouldn't you do the intake? What some conisder a small streetport can get good mileage, make huge power and have excellent torque.
My current engine consists of 82(83?) 12A sidehousings, street ported using the Racing Beat templates. The rotating assembly is 84 or 85 GSL-SE, can't remember. The rotor housings are 74 or 75 13B. Short answer: Yes, you can convert an 84-85 13B into a 4 port by using 12A side housings. You can't mix 12A sidehousings and 86+ rotor housings due to the non-existant grooves for the water o-rings.
