RX8 Header
 

Hey guys I know my post here aren't up to speed, but i was wondering what is your interest in a RX8 designed either like the FEED style or Knight Sports style while being available for around 600 U.S.D. Is there significant interest, I'm talking to some companies and would need about thirty responses, to go ahead with the project. I will have some designs up this week, and some actual pics once it's decided on. Also if some one like rotarygod or another Very knowledgeable Rotary tuner/walking information center has some suggestions let me know as i have the resources to do this and would be more than willing to get some projects moving.

Im sure if its a design that makes horsepower many people would be interested.

There is an old thread here that might be informative for you. Search for "header theory". I think. I dont think there is much HP to be had here. But this is over my head.

sad,

hey rg someone wants you to do your homework for them!!!!

beers :beer:

Here's a Rotary God special on Exhaust theory that may get you started in the right direction.

https://www.rx8club.com/showthread.p...=header+theory

man go for this!!! hahah as long as it gives enough hp for the $$$ i think a lot of people will be interested. but as staticlag said, there probably isn't much hp there.

I Don't need rotary god to do my homework, i've read most of whats been said on the headers, here is my suggestion, as i haven't designed any thing for a rotary i have some limits and until i get something going and tested i have no idea what i'm gonna see. But for all you you who think that you are the worlds greatest, by all means make some suggestions, But here is my thinking back to the design, on a copy of the knight sports, at about 4" instead of turning the two center ports together to make a 4-2-1, i was thinking based upon the pulses which yes are not the same as a 4cycle piston motor, tuning the secondary 1st exhaust port in the the main exhaust of the 2nd rotor primary exhaust doing the same for the primary on the first rotor, and the secondary on the 2nd rotor, now the tuning velocity is some what of a wonder to me at the moment, need more research maybe some testing before going anyfurther, but instead of going straight to 2-1 collector like most would, how about going to a chamber of volume allowing it to continue velocity at a low loss level, I will have designs up this week hope fully before friday but as work allows we will see where i get. Anypeople who know rotaries, i am very thankful for any thoughts,

also as we have all seen from most horsepower gains are very limited even with all the work, I'm hoping for a modest gain, with a price more resonable than the competitors as i'm not willing to spend 1300 on a header for a 7 horsepower increase.

sorry if you miss took that,

but little is to be gained... rb has not come up with one.. and yes they know rotarys.. hymee does not have one out yet.. and your knowledge of rotarys is what..

and the best thing you could do is come up with real 7 hp gain. copy that header. and see if it really gives 7 hp..

beers :beer:

pm back.

beers :beer:

I said i would try, as this is my first try with anything rotary related besides a cold air intake i built at work, and my catless pipe i made also. i have no dyno sheets as i have not experienced huge gains in power and seen only moderate mpgs off of both upgrades, but where i work i have access to try, and the connections if it works. I know much can't be gained, Most reviews on the knightsports headers seem to be a modest gain but i have never seen a dyno sheet from an unbiased side, i'm waiting for mine though to replicate the flange. And we shall see where we go with it.
PM'd Back

location? I have a flange that I'm saving for a project like that...

The standard 3 into 1 design has been tried as we all know and only gives about 3-4 peak horsepower. A 4-1 design has been tried that had a divider that inserted into the center runner to keep the ports separated and it still only gained about 3-4 peak horsepower. Separating the center exhaust port and combining them in a way that would keep each rotor separate so you'd have 2 pipes that then collect together in a sort of 4-2-1 fashion would basically be what a 4-1 system is doing to the firing pulses assuming of course you collect them all at roughly the same length.

There are really only 2 designs left that need to be tried and there's no guarantee that any of them will give more power than the other ones. Keep in mind neither of these is intended to be used with a cat for space reasons. The first is the design that I've wanted to try for 3 years now that collects the outer port runners and then collects the center one in downstream later at a specified length. This length is based on some basic calculations but mainly by trial and error so don't expect this to be a one time test. Even if this deisng doesn't work as well as I think it would, there is still another tweak to it left to try.

The other design would be based on the 4-2-1 system but would basically keep the 4-2 part of the header collected early but then move the 2-1 collector to the back of the car right before the muffler. The other alternative is to never collect it at all.

I do have other ideas that deal with exhaust and engine work combined with some special machining but I'll tackle that one on my own someday. I don't really care about the exhaust aspect as anyone can fab up a system of pipes through trial and error to see what works and doesn't. I'm not trying to make money off of rotary exhaust systems. The second I released a design that works, people would copy it and sell it cheaper on ebay and all that I accomplished was make some lazyass person who couldn't do their own research a little bit of money at my expense. I'm not doing it that way. Quite the opposite actually. Anyone can use my exhaust designs all you want. I guarantee nothing other than claiming that the designs have merit but need to be tested to be verified. If you make them work, I'll copy you and then tweak it to make it better! If they are my ideas, that's fair. I wish more people would think outside the box. They just don't. They think conventionally. I've just told you how to think differently. My other engine changes will not be shared but anyone that knows what I do to 13B engines can probably figure it out. How about a tangential absorption muffler design? If you want one more little hint, stop using 3" exhaust tubing! I will say nothing more about that.

I'm in San diego, i'm supposed to have my knight sports header here this week, the design is coming along just trying to figure some info as what rotary god makes sense but i think they are missing what i'm saying, i don't know we shall see when my design is up if they are or i didn't explain right. The Header will be about 3 feet in length because of the expansion chamber when the center secondary runs into the primary of the first and vice versa for the other primary to the secondary. What i'm doing is sorta the same but instead of using a huge length to achieve the goals, i'm chamber and length tuning. Just So Every one know i expect no more power than anyone else's header, i will invite every one in the socal area to the before and after dyno that is truly interested, it will be ran with no tuning at the time, just a back to back. I'm currently working with the company to lower prices on all the parts so i might get a better deal on the 500 headers if not i may just build 10 and sell them for the cost to do this which in that case is a little over 300 if all dimensions stay the same. I'm priced out as of now if i can get all my bends here in time and make sure they fit properly The design will be up soon keep checking in. also, anyone know if i can display solidworks on the RX8 club.

keep us posted...

A 4-2-1 would be interesting with center port of rotor 1(2) combining with the outside port of rotor 2(1).
________
Montana cannabis

Nice link to RG's mini-thesis, it's a good read.

As a few have said there is very little to gain with the header. On a motor with no overlap all you get is a little less pressure during the exhaust phase.

Where headers make a larger difference is when there is intake-exhaust overlap to give the intake charge a "nudge" to move to the combustion chamber a bit before the expanding chamber volume begins the draw of intake.

not this BS again, the only Renesis header design that's better than the other one is the lightest one, including a log-style manifold (properly configured of course)

Also, there are no heads on the engine - LOL

people will buy for just a little gain , better sound(subjective) and weight savings--if the price is right. Just an idea--but would it be better to go for a header with a header back system?
olddragger

That sounds interesting. Good luck with that!

Currently only "bmp doc gif jpe jpeg jpg pdf png psd txt zip" are the allowed file formats it seems. Is that what you needed?

If Solidworks dosn't output into a compatable format, do a screen shot and convert that into a bmp.

Thanks guys for all the help, on this the solid works doesn't display so i will do a screen shot of it and show it. I'm still in designing, pulse widths, seem to be a little off at the moment on my car. so i have a friend bringing in his non modified rx8 to see if even little changes make a difference, or if thats just the way it goes.