13BTOY

iTrader: (1)

Is it worth it to streetport an SE 6port motor? Many say that it makes no sense while other say differently. How much should improvement over stock should I expect?

Thanks, Ed

purple82

The people who say only 4 ports can be street ported are wrong. My S5 street port makes 177HP at the wheels.

Alex-7

I'm with purple82 on this one.
Racing Beat seems to be the only company that is die hard opposed to porting six-ports, and even though they have a valid point, that you can't port six-ports as extensively as four-ports, there is still room for improvement.
If you have the motor apart any way, it is deffinatley worth porting a six-port, but if peak power is what you are going for (top end) then a four-port is ultimatley capable of making more than a six.

Atkins built me a ported six port and belive they advertised a 15-20% hp gain over a similar stock port 13B


-- Alex

Blake

Streetporting a 6-port engine is very worthwhile! I've done a few and the results were spectacular. For example, my 2001 Grassroots Challenge car was a GSL-SE with the rebuilt stock block, except with an agressive streetport (aka "rally port") with the 6-port sleeves removed and Teflon inserts used to radius the end of the runners. This car ran a 14.7 quarter mile...and this was with the stock exhaust manifold and stock cat back (just a cat replacement pipe), and completely stock intake and EFI. This was with it falling on its face mid-track due to fuel starvation (stock fuel pump and non-gsl-se fuel pickup). Here are some pics of the porting:

Blake

Racing Beat makes some very high quality products and does some great research and development. That said, Jim Mederer (co-owner and a legitimate engineer) is not an "outside the box" thinker, as far as I can tell. I've only met him once and the conversation was not very insightful, but I get the feeling everything he does is deliberate. Evolutionary innovation; not radical risk taking. Also, I read an article he wrote about a year ago in Drag Sport where he admitted to not having much experience with 6 port engines...all his time was spent on 4-ports because he had no reason to play with anything else. So, if Racing Beat is characterized as being detractors of porting 6-port blocks, please understand that any such opinion was likely a preliminary estimation that prevented them from pursuing it enough to know better. In other words, take such recommendations with a grain of salt, even if the source is highly respected.

comradegiant

Sure a streetport of a six port isn't AS effective as one on a four port, but every little bit helps. Why wouldn't you?

LongDuck

As stated by others in this thread, there is also the possiblity of porting ONLY the '6'-ports, such as what one rebuilder currently does. This allows you to easily pass emissions testing without the porting job becoming obvious, since the '6'-ports never open during the standard idle, acceleration, and cruise tests.

I plan to have my rebuild ported on both intake and exhaust side to squeeze every bit of power out of the SE engine using the stock intake with cold and ram air, plus RB exhaust system (presilencer and PP muffler).

If you're going to rebuild with someone, I don't see why you wouldn't for about $200 more than the rebuild, and that's paying for their expertise in doing the job, not the complexity of it. HTH,

riceburner1r2001

iTrader: (4)

i would change the intermediatte housing with the bigger intake ports, thats what i plan to do on my se

xrotaryguy

Is it possibel to get rid of the bit of metal between the upper and lower ports so as to make a sort of 4 port motor? Or is that just a stupid idea? Just curious. It then occurs to me too that you could use a turbo 2 motor as a naturally aspirated 4 port motor if you just used higher compression rotors like the 89-92 variety and street port that.

Fire85GSLSE

iTrader: (29)

How many miles on you adkins rebuild? Did you ever put it on a dyno to see just how mush extra you got out of it?

purple82

[QUOTE=xrotaryguy]Is it possibel to get rid of the bit of metal between the upper and lower ports so as to make a sort of 4 port motor? Or is that just a stupid idea? QUOTE]

I've seen the primary and secondary ports joined all the way through the housing. It's done on engines that don't need to run at lower speeds. The ports end out too big for street cars.

Alex-7

Still only about 350 miles on the motor, once I get about 500 on it I'm gonna try to get it down to Prather racing for a dyno tune. As for now it's running great.
I'm hoping for in the 160's at the wheels, wish me luck......

capri93

Going along with the conversation here has anyone completely removed the 5/6 port sleeves that open and close? To anyone who has how did the car run? I would think similar to a 4pt STPort.

purple82

Yup, i'm running without sleeves. Comparing my dyno sheet with a stock S5, I've lost no low end torque.

capri93

Hows the sound, and what kind idle does it have.

web777

How does the stock EFI account for the extra fuel needed? Is able to adjust from the O2 sensor?

purple82

Mine's still got all of the emissions controls and a Bonez cat running through a 2.5 exhaust with RB headers and muffler. It's pretty damn loud. Not Honda loud though, the sound is very rich. I like it but at full throttle it can be kind of embarassing. It idles at 850-900 rpm with some very minor lope.

capri93

Sounds like a winner for me did you do any other porting besides that?

YapaKanichi

I say just do the 4-port I mean by all means you can port it more aggresively. But hey thats just me. And my ilde is around 1100-1200.

capri93

I understand that 4pts can be ported more extensivly, but I already have a six port thats in very good condition. I plan on a 4 pt but I'll make do with what I currantly have for now.

1984special

Does anyone know if the SE would pass smog on stock everything except for ported 6ports? And in CA with the new rolling dyno smog? This would be nice to know as I'm getting a lot of engine experience...

web777

You can always disconnect the actuators.