To the OP: Go for it. It has been tried before with not so good results. Discussions are about conflicting views, and information, or there would be no discussion. Many here have been here since the very beginning, and i would heed what they say. They have also seen many, many come and go, who had "great" ideas that turned out to be nothing. But, you might have insight that no one else has. So, if you have counted the cost,and deemed it worthy, then do it, and I look forward to reading about your progress, and how you overcome the inevitable problems.

To the Forum Guys: The is no "feeding frenzy" on a car forum that I frequent, like the ones that take place here. If you all want to keep talking to yourselves the next 10-15 years keep it up. I like to see new guys come in, don't you? They don't know everything, that is why they are here. In this case, if the guy is a troll, he's got me fooled. What a great way to kill a forum, sending it into relative inactivity.

 

That seems alot of peoples opinions yes. But not everyone thinks that way. Not in nz anyway. Its kind of like why do people bridgeport there engines? I think alot of people do it for the sound. If i was to do a bridgeport renesis fir example, i would only do it for the brap brap sound. Even if it ment it lost power.
not every engine modification had to be about getting the most power. If it was we would probably all be running 13brews.
with my build i will have something unique. Something different.
im doing this engine as ive stated before, for the sound and inovation. Thats my main objective

 

Cheers for the positive comments. My post sure has stirred up a few people.
that was not my intention.
Im a new guy here and i definitely dont know everything.

Whar is a troll exactly? It often gets mentioned.
Is that someone who just makes up stories for attention?

 

it’s somebody who’s making stuff up only for the sole purpose of trolling for sucker responses, because people are having a hard time believing that you really are just an inexperienced newb talking up mountain high piles of bovine fecal matter regarding schooling everyone on all things Renesis.

but go ahead and pursue a mediocre, yet cool sounding, result. That it can’t be done at great cost and effort was never in question. That was already proven long ago.

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Thanks for ckearinclearing that up.
sorry i haven't got time to make up stories. Whats the point.

 

maybe it’s just that somebody so misinformed and unknowledgeable, yet so convinced of the opposite, hasn’t floated down the pike in such a long time, yet it seems to be an ever increasing trend for the age to come ...

 

Well in that case ... you seem to be clear on your objectives and those objectives look quite achievable ...so I look forward to seeing your progress.
If you have read any of my threads you'll note that i'm always keen to try new and sometimes crazy ideas. I'm in NZ too BTW ...there must be something in the water here .

 

I still don't see the center rotor having enough exhaust flow with the 2 small center iron ports.... if there was a lot of room to port them out maybe... but there isn't a lot of metal there

And more and more I'm questioning the 3 rotor anyway...... shop drag car just pulled almost 1000hp at 45 lbs.... and that was with a slipping clutch.

 

John Britten. Fisher and Paykel. Definitely the water...

 

Perhaps if you addressed the legitimate feedback you got, rather than waving it off as not a problem, you wouldn't have to explain yourself as much . Have you considered that the points made in this thread might be valid? For one your plan to address the restricted center rotor exhaust appears to be restricting other rotors equally, at which point your net flow capacity is not better than a stock 2 rotor. Are you really expecting to make more horsepower with the same amount of air going through the engine?

​​​​​​If you're not in it for the power, fine, but 2 pages ago you had a 280hp figure in mind, so don't blame us for not understanding the goals here

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Nothing was proven unless you can prove it wasnt proven. Its nothing more than opinion.
but thats just my opinion.

 

Best i show and explain in pictures at a later stage.
I will also post up flow tests on exhaust ports aswell as intake ports.

3 rotors are definitely cool. 1000hp is definitely achievable with a good build.

 

I can only address a certain amount without pictures etc.
even with the possibility of a restricted exhaust port, im not planning on actually making the port on the iron face smaller, just the sleeve. Im still aiming for 280hp at the engine

 

I wish you luck... you are limited in space. And with rotary exhaust size does matter.

Ask Brettus what happens to the center port insert when it gets hot...

I hate to be a downer. It's something I looked at a couple of years ago... and didn't like the cost/benefit trying to get it to work. Especially when you start looking at custom 2 piece shafts and have the flow issues in the exhaust

I hope you have something that works.... it would be cool.. Thought about using Renesis rotors for the compression and cutoff seals and peripheral exhaust ports... but the manifold got ugly fast. And no real benefits over a 20B except parts are easier to get I guess...

 

Can you tell me what happens when the center exhaust insert gets to hot? Someone above mentioned i should ask you?

 

The inconel inserts crack and then tear up and spit out eventually, particularly on race engines. Most siamese port runners with over 100000kms on them will show signs of the initial crack that forms on the divider. Make sure you find some with no sign of any cracks (difficult to spot if you don't know where to look) or better still start with new plates.
As mentioned earlier ............ come see me if you want some info on tried and tested method to make the sleeves not only last longer but flow better.

 

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Thinking about this some more , to me this seems counterproductive. Hard to know what the effect will be but ,potentially, it could hobble the engine such that it makes even less power than a mediocre 6 port.

Why not leave the ports as is and then treat the tuning of the middle rotor separately, so you at least get close to your goal power output.

 

the obviousness of the situation eludes you once again.

 

Not helpful .... enlighten me.

 

logic only applies with smart people, obviously so

 

oh ...I thought you were implying there was a problem with separately tuning each rotor .....................

 

 

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Interesting... i went and bought 3 RX8's last week for their engines. I really want to do some flow tests on the exhaust ports to see if they all flow the same.