We did get overlap,

the exhaust ports was made to open earlier, and also a bit bigger going down, it was also made to flow better going out, more straight line and smoothed,

one other thing on exhaust side, if you look at renesis, you will see al of them build up carbon at the top of the port, where it is narrow and sharpewr, it builds up, so they made it a bit of an arch not sucjh a narrow sharp tip and made it smooth, this will help in lowering in carbon as well as flow and overlap a bit more

On exhaust side all i have is the following:

we removed the cat totally then put a 2.5' straight pipe in its place and put the sensors all back, then we removed the big box at the back and put in a split with smooth bends, not sharp, then two smaller boxes, same idea as the mazdaspeed boxes exiting in standard tips at back.


there was a small change on the auxiliary ports, smoothed, and a small bit bigger, very small.
the biggest change was the bridges, exhaust ports and the primaries, bridges are at primary and secondary ports!

i know you all want dyno results, will have it some time, but be very patient,

the motor was open as i had damage with 2 broken side seals and broken corner seal, thus they said they will do the porting for small cost extra, although it takes time, as they and me wanted to do for test / experiment.

I must say, it is a father son duo, the son was main tech at Mazda on RX8s, and his dad di rotaries since they came out, and he specialised in Bridging, thus when he said it will work, i believed him,

we are thinking of puitting aftermarket ecu later, this will definately boost power a lot, as then we can do it 100%, will run much better.

port area are at end approx 15-20% more,(primaries went a lot bigger) but they looked at all options, they say exhaust was also big enough and will flow better to allow more to go out, nothing was done too extreme to only have small powerband, nothing was done by just cutting or removing metal, timing was also looked at to make sure the volume can be used

I agree, there isnt a lot of space for bridge port, thus it was kept that it will still last, it could have gone bigger, to the outsides and then cut into the housing, but i wanted it to have more power guaranteed, but still last,

the bridgeport is part od the porting, but all other together will make it more at end, remember the primary and secondary was bridged,

Actually they made a small bridge, with same idee at the auxiliary ports, (short, same length as port) but we didnt change the port actuator fully yet (to get full function of the bridge), as we first wanted to see how it goes now,although the aux ports are bit bigger and bit better flowing now. the actguator needs to be cut back to expose more area on outside.

we will look at that part later if needed.

at moment i think it will be fine, not too much worse fuel economy but will have more power, and nice sound, a bonus i think

if not why not, we had the chance


I will keep updated,

believe me I cant wait to push it a bit,

so far all ok

Philip

 

just to correct a bit,

the exhaust port top as i said which was more rounded, was made at angle to make sure it dont hit jacket and assist flow, smooth etc and to prevent the csrbon buildup there.

at end it was catered for, more mixture in and more can go out, and then easier in and easier out

that is about it

the only other thing i have on apart from exhaust change is a BMC F1 air filter (drop in)

i also as precaution replaced my coils,

my car had 208 000km on when we did it, i do looong trips
130 000miles which i think was good life for side seals,

i also add approx 200-250ml of 2 stroke oil to fuel,

when all running fine i can give you detail of guys who did it in South Africa, but far away for you guys


Philip

 

I forgot one thing

The ports were also rounded to prevent the big side seal wear as in previous discussions / threads

all in all i think it might last even longer than first time, especially on side seals

and i will never stop using extra oil in fuel,

on the original motor i used Royal purple most of its life, just for interest, will do so again when run in


Philip

 

So, you made a custom dual exhaust? It sounds awesome indeed. Good work, lot's of us will be watching your efforts for sure.

 

That sounds good.

 

On ya Phillip,

I have been personally following Philip's LONG overhaul saga, the shop doing this took a very long time.

BUT, YES THIS IS REAL, Please don't insult the guy saying it did not happen.
And I can assure you it is a RENESIS.

 

What do you mean from where? The Renesis only has 6 degrees of dwell. How can you not get overlap with a bridge? That 6 degrees will be made up by the bridge itself and this is before we even get to the small eyebrow port. We won't have the drastic overlap of a peripheral port but we'll still get some.

 

My point is that thing sounds like 20 degrees of overlap. That thing sounds like my old PP REPU.

The other thing that bothers me is that he said the Bridge Port is 5mm wide. The Apex is only 6.75 mm high. I would be thinking in a short time that baby is gonna drop n the port. Not to mention the Apex Seal wedge.

I'm an inquiring mind, I want to know.

 

it must be a recent fondness, lol ....

 

The port itself is 5mm wide not the bridge.

 

You've got the results.

 

That's what I was talking about.

 

following with interest.
i am sure he discontinued the secondary air pump slots etc. did he work on prevention of the spark plug cracks
OD

 

This would be one of my main concerns. Hopefully the port isn't into the waterjacket.

 

lets see some dyno sheets, sounds sick!

 

What was this diagnosis? Maybe the Mazmart water pump and thermostat would help to flow and control better. I hope you just lost some out of the reservoir...

 

diving into new waters....................... kudos for the guts to try--hope its not a jacket.
OD

 

http://www.mazdarotary.net/porting.htm

 

haha ray this is WHY i have the bhr coils now. this happened before :P

very interesting to see atleast some more people trying. I know everyone is asking for dyno and fussing about HOW he did it, but its done.. if you are rebuilding a motor and know how to make it happen safely and you dont lose any power atleast, then why not? sounds unique as hell and you can say you have a bridged renesis

 

No, I just psted it to give people an idea on what the subject pertains to, nothing more. The concept is generally the same, though the specifics may vary based on the engine type

 

If you can get the port long enough and it being located at the outer tip end of the rotor there is potentially a point where both the intake and exhaust port will be exposed to each other for overlap, whether this is possible in a Renesis is beyond my understanding

Given the inherent EGR effect that's built into the Renesis, I'd be a bit concerned pro vs con relationship. Ultimately the dyno will tell the tale ...

I'm not sure that opening the exhaust port earlier is what you'd want to do either

 

Renesis animation zip file (19 Mb): http://www.turborx7.com/Media/renesismodule.zip

 

? not to dilute this idea but why are we thinking of getting more intake area when the exhaust port is more of a prob?
OD

 

That's what I was referring too (or at least trying to). I can kind of picture it now, but it was my understanding the coolant jacket is dangerously close when you open it up like that with the Renesis.

Thanks for the link- it's very helpful (bookmarked)

 

Hi All,

i was away for few days wsith work,

i will make a video clip showing the idle including under the hood, to give more proof,

secondly, my water leak are sorted, thus no worries

i know the guys who did the porting didnt want to show too much, but they did show me as customer, if i am happy, and yes i had a concern of the apex seal, the small corner if it might "hook" or fall out, but they assured me they tested it all before assembling and said, it cant go anywhere, as i said before, the guy who did the porting is in his late 50's and ported (especially bridgeporting) since the very first RX2's, so i belived him. As no one here did it yet on renesis, they didnt want to distribute stuff and then there is a problem, which i understand, but they were very positif anyway.

I think there is still a other renesis housing where they did some of the marking on in their "checking" etc, i will try to get pictures of only that if possible.

the port itself i said was 5mm wide, approx, it might be 4 or 4,5mm,

when i went away for work, i left the car at them to fix and check the water leak as well and to check all out to see if any faults after 500km i did, they just adjusted my clutch, adjusted up and bleeded some airbubles otherwise no problems,

they did rebuild a other 8 standard a while back and said they can feel a differance as they gave it a short push to 7000rpm and they said it was definately quicker,

i am taking it to 5000 rpm then in day or so to 6000rpm etc just for safety

Dyno will still be far away, biggest at moment is the cashflow.lol

but i will give as much info in the following days to show it is a renesis

my clutch sound totally differant now, a bit more noisy, but due to my brass button clutch (no sprung centre as well) but getting used to it.

i will take some pictures as well and post them.

it was correctly said that they did take long with my car, but so far i am happy with result

i only arrived back tonight and will take pictures and video tomorrow, i will let all know

opn the overlap, remember that the top (sharp) part of the exhaust port was also rounded and smoothed more, which did make the actual opening time a bit more (port actually a bit wider and rounder at the top) this i think helped even more on overlap, but was actually done to prevent the carbon buildup in that top corner of the exhaust port, all was smoothed as well

i will send as much as possible as proof, but i know how it looked when they finished the ports itself


Philip